SynRM | A new giant in the electrical world
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- Опубліковано 29 вер 2020
- With the advent of advanced control algorithms SynRMs are getting super popular across all the industries. Let's understand the physics and design features of SynRMs in detail.
We thank EMWorks for their FEA support. To know more about this powerful electromagnetic simulation software checkout : www.emworks.com/
For those who want to delve deeper into SynRMs here are few links
1) SynRM's potential uses in the industries - • Start saving energy wi...
2) Interesting control logics of SynRm - • Control Logic | ABB Sy...
3) Torque comparison SynRm vs IMs - ieeexplore.ieee.org/document/...
4) The latest trends - www.plantservices.com/article...
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For those who want to delve deeper into SynRMs here are few links
1) SynRM's potential uses in the industries - ua-cam.com/video/3g9lDqkCP3g/v-deo.html
2) Interesting control logics of SynRm - ua-cam.com/video/ZOH1PoOOeuY/v-deo.html
3) Torque comparison SynRm vs IMs - ieeexplore.ieee.org/document/1518350
4) The latest trends - www.plantservices.com/articles/2020/why-permanent-magnet-motors-and-reluctance-motors-are-finding-increased-industry-application/
ua-cam.com/video/tM8PBnuz4Ks/v-deo.html
@LowJack187 - yes and no......more poles equates to slower maximum speed but more torque. But sophisticated motor controllers and new motor design can change all of that.
When showing a Tesla as an example, you should also have discussed how a SynRM works as a generator (to recover kinetic energy). Yep, not quite as simple as with an inductance motor, but yields good (>90%) efficiency.
Don’t forget about yokeless axial flux motors
Now explain declining EROEI.
Nice video, but as an electric motor developer I have to clear some points up, that are just not true.
While the efficiency is really high, the torque output is definately not. For the high efficiency induction motors, you might be able to replace them with syncRel motors of the same size. But if you look at through-ventiled induction motors, you will not be able to match their torque with a syncRel motor of the same dimensions.
Yes, Tesla uses IPM-synchRel motors. But what everyone always fails to understand is the reason behind this. At low speeds, more than 90% of the torque is due to the magnets. Only if the motor is running at high speeds, the reluctance torque becomes relevant. Looking at the design I would estimate that maybe 50 % of the torque at max rpm might come from reluctance. So what Tesla is basically doing is taking a PM motor and adding a bit of reluctance torque for better field weakening performance at high speeds.
No, syncRel motors have not started replacing induction motors in most industries. That is just not true and I'd like to know where you got statement from.
"For the same current input synRms are able to produce 10-15% greater torque". While this is theoretically true in practice it doesn't work like this due to overload capabilities. You can look up my following comparison: Let's assume I want a 400 V 30 kW 1500 rpm motor. For both motor types it will be the same sized frame. After comparing several induction motors, the currents are ~54 or 55 A. One of the leading manufacturers of industrial syncRel motors is ABB. If you check their catalogue, you will find their motor - while more efficient - has a nominal current of 66,7 A. The overload capability is only 1,5 while the induction motors go up to 3. I will describe the reason for this below.
Also here are some disadvantages of syncRel motors:
SyncRel motors rely on small airgaps between rotor and stator. The rotor design is inherantly less stable than that of an induction motor. Therefore it is a terrible choice for high speed applications.
For through-ventilated motors at medium speeds (lets say ~3000 rpm) an induction motor will be much smaller and therefore have a much smaller inertia.
Another factor often overlooked is the terrible overload performance. While normal IE3 induction motors can easily have breakdown torques of 3x the nominal torque, this is unthinkable for syncRel motors. This is because their back EMF depends on the load. So if you want to design a 400 V syncRel motor for short 200% overloads (this is more common than you might think). Not only would you need a larger motor, you can only run it nominally with 200 - 300 V, meaning that your nominal current would be highly increased. So the losses you save would be massively outclassed by higher losses in the stator. Induction motors on the other hand can just run nominally at 400V and still have lots of overload capabilities. This is also why you should not use pure syncRel motors for traction or electric vehicle applications. In these applications you want very high overload capabilities.
But even after all my banter, syncRel motors still have their place. They are well suited to continuously operate fans and some types of pumps, which require no overload capabilities. In these cases the efficiency can be increased by switching from induction motors to syncRel motors.
I know this was a bit long, but hopefully I was able to bring across my points.
As electric motors are my passion, I am happy to answer any questions you might have.
What about price? This looks way more complicated to build and operate (hardware /software) than a simple induction motor.
Great to see people taking intrest in this subject.
Thanks Mr. Würfel!
Incredible comment, hope it gets pinned and the original poster looks into it. Good job on providing insight!!
@@zumbazumba1 SyncRel motor are actually very easy to build. For mass produced motors the rotors and stators are made out of stamped laminations anyways. The stationary part is basically the same for both motor types. For the syncRel rotor you just need a different stamping tool. Also you don't have to pour molten aluminum into the rotor.
So for the same dimensions, the syncRel motor would be cheaper to produce. But generally the syncRel motor will be a bit bigger, which will negate the savings.
Regarding the controller: As the video stated, you need to operate syncRel motors with controllers. The software needed isn't that advanced as you might think. Most modern controllers for permanent magnet synchronous motors can operate in sensorless vector control mode. This means, that they have a method of determining the exact roto angle without a seperate sensor. This has some problems for low speeds, but generally works really well. As syncRel motors are currently not far spread, many controllers do not support them. Therefore most syncRel motors are sold with the controller included.
Regarding the ease of operation I would say it is about the same complexity as any other variable speed drive.
Hello Zauberwuerfel, Thank you for such an elaborative explanation. It has provided us a better insight. We should learn more from you. Can I get your email id? Otherwise please feel free to contact me at sabin@learnengineering.org
Audience was initially reluctant, but is now synchronous with your presentation. Cheers!
Hey all, despite some exaggerated claims here, I have to say as a professor of technology and professional electrical engineer that the video presentation is nevertheless very good and informative overall. I'm impressed, great 3D animations too (I know, I use Blender for my stuff). From my studies, I'm not seeing too many applications using these motors past 30HP. They are primarily used in lower power fans, pumps, and conveyor systems were the energy savings relative to similar sized induction motors, especially at reduced speeds, warrants their inclusion. Where large numbers of motors are used in a building or plant environment in this HP class, dollar savings could add up and companies like Siemens and ABB are boasting new product lines using these. This has been largely driven by green initiatives under European directives and elsewhere. Reluctance motors is not a new concept, merely one that has come of age with the advent of microprocessor solutions for stator control that did not previously exist but reluctance in itself is self limiting and never as strong as having a second rotor magnet, either due to induction or a separately supplied DC exciter, as in a synchronous motor with a field.
That's why for larger motors in the hundreds of HP, the induction motor and field excited synchronous motor, or traditional DC motor, or BLDC, will remain the kings for some time to come. Once you're into say 100HP and up, I don't think you're going to see this motor type in a large way any time soon and as one of your previous commentators pointed out, an induction motor can be designed with 200% to 300% pull-out torque. Good luck getting that with a reluctance type motor. Everything has its pros and cons, all we're doing now in technology is trading one set of advantages for another but never getting everything we want in one design - that's physics.
Very well said.
What about VFDs? You can simply control in software for all that stuff. At the end of the day, electric motor is a transducer - power in = power out, sans losses.
>I'm not seeing too many applications using these motors past 30HP
How about electric cars?
Hey! I need to ask you a question. What kind of motor is great for low rpm, high torque, silence and heat dissipation? I want to build a fast ebike that is silent.
@@videosforcatsanddogs214 Virtually all hub motors are permanent magnet 3-phase AC synchronous motors, you'll be hard pressed to find anything else whatsoever - why bother asking.
I think this is the 1st example of a complex electrical concept which was explained so well that it was understood from beginning to end! Bravo!
Wow, there's some really smart people in the world that are able to figure this stuff out .
full credit where credit is due, but honestly, it's just a small evolutionary step (over the last 280 years), not a clean-sheet invention...
The video almost seemed like a sales pitch for SRMs. My first thought was: if SRMs are so good, then why aren’t they replacing induction motors everywhere? But reading the many comments answered that question pretty quickly.
Can't be explained better , magnificent work
4.29 million subs and this is the first im hearing of the channel. How the hell did YT not know I wanted this?
Right?!
Wow never learnt this thing so well in my engineering
That's how India's education system is outdated
because in engineering we are more inclined towards learning the equations that gverns the machine.. This video is in simple layman's term you cannot expect an engineer to know only how it works physically.. the mathematics behind it should be clear as well..
Math QUESTION
Algebra question
ua-cam.com/video/KnH1V3lVfRY/v-deo.html
One time watchble.
Fun thing is, I am writting my thesis about designing a SynRM motor as an EE undergratuate, and this video shows up. :D its priceless. Thanks!
I've looked for an explanation on the internet for a long time without success. This is a good first attempt, better than anything else I've seen. But as one commenter has clearly and helpfully pointed out it's incomplete and incorrect in the latter half of the video.
As a former nuclear trained electrical operator I loved this. I’ve also seen 3 phase DC and worked on a nuclear powered battery. And I’ve repaired over 20,000 welding machines and plasma cutters.
You guys explain it very simply and by using good softwares like solidworks... With lot of hardwork... My gratitude to your team.👏👏
SynRM = Constant Velocity (as long as load doesn't vary and controls dependent)
Induction = Constant Torque (as long as enough current is available. Current is a function of load, will self-destruct if stalled)
I think that a 4% gain in efficiency is overwhelmed by a 10+% loss in reliability.
VFDs have their place, but certain equipment needs to be robust and reliable for prolonged unsupervised operation. As an HVAC technician, I've had to back-fit a lot of VFD and EC motors/controls in the last 15 years. Many of them being less than 5 years old and outclassed by 3phase and PSC motors.
Excellent Presentation
This taught me things I didnt understand in a class designed to teach me precisely this
Thats the way to vent your frustrations upon your Lackadaisical professors LoL Ha!Ha!Ha!
That's bs
Remember; this is Revolutionary Electric Tech! So this is new development product.
Wow i thought i understood these concepts but you have explained the ‘why’ of it all, way better than ive ever seen, thanks so much!
One of the best videos on UA-cam I've seen this year! Thank you!
I agree - - - Good Summary
Yeah this one is going to my "Perfect video to watch at 3 am" list
ua-cam.com/video/tM8PBnuz4Ks/v-deo.html
That FEA simulation plus animation is done so beautifully. It's my fav part in the video :). Kudos to team Learn Engineering!
Yes that was the best part this as i am also from FEA background i liked it..
@@suyashdalavi6524 yes suyash. Even am learning FEA 😅😊
Brilliant video!
Your channel is the positive force on the Internet. Forza!
Although I am no expert on motors, I enjoy learning the different types and how they work but this is the first time I've seen a video about this type of motor. 👍
Loved the explanation of how the motor works. From what I understand, there are still advantages to induction motors which is why Tesla still use both (different torque, power & efficiency curves).
-SRM advantages seem to have efficiency (which is still only a couple % higher than induction), but the rotor can be significantly cheaper to make and from what I understand more power dense.
-SRMs actually still aren't very common. In fact, I would say induction motors will continue to rule domestic as they're very cheap, efficient & durable when powered by AC mains (as they don't need expensive controllers when the source is AC). While small/RC motors or battery powered motors will probably remain as PM or brushless PM, as they are incredibly power dense and easy to control.
SRM is definitely my fav thoughxD
Great video, many people in this industry don't know and don't see the shift towards these motors. With advanced switching capabilities of today these motors become a very interesting choice.
@@ruialbano5340 Weird comment. You can make any electrical motor powerful as long as you make it big enough and supply more voltage and current. But you mean for its size? or what. Or efficient?
Excellently explained. You did in 10 minutes what would take days in school class.
Absolutely brilliant...well explained...
Love this sort of tutorial..
College days👍👏👏
I designed and installed many industrial projects where I applied a variable frequency drive to an existing induction motor to match the motor output to a varying load. Many of these projects involved pump applications and the motors were typically on a multiple motor manifold. The motors were typically 50 to 250 hp, 480 volt, 3 phase and up to 5 motors on a manifold. This approach provided a typical payback of 2 to 3 years. The power output of a motor has a squared relationship to the speed; at 70% speed the motor consumes about 50% of full load power. Replacing the induction motor considering the cost of the motor and the labor to replace it would run the cost through the roof and extend the payback past where most industrials would not make the investment. In business, the cost vs savings is always in the forefront of the decision.
I also installed equipment with large servo motors as part of the process. The servo motors had permanent magnets in the rotor and a rotating field in the stator and were able to start and stop on a dime and display incredible acceleration and braking. I imagine this type of motor would be more expensive than the SynRM motors but have torque and performance benefits.
Frank D - You mentioned how your servo motors could start & stop on a dime, great for braking. I’ve been following the frustratingly slow development of in wheel motors. One of the main drawbacks is excessive unsprung wheel weight.
If a motor could fully brake the wheel, ABS & all instead of just energy recovery, pneumatic brakes might be eliminated, cutting some or all of the weight of the brake parts (depending on whether the new wheel motor was heavier). The saved weight in the wheels, plus weight saved in the rest of the pneumatic brake system would be a nice initial drop in vehicle weight as a whole. And of course you’d have the cost savings of an integrated propulsion-braking system, both parts and manufacturing.
But the above assumes an upgrade of an existing in-wheel vehicle: But we’re not. I have in mind a small EV, like a VW ID3 but lighter (possibly a Tesla Model 2).
With this as the starting point, both weight & cost savings might be greater, since the machinery inboard of the wheels of the standard EV (motor mounts, connecting axles, etc.) is replaced w/ just 4 individual wheel suspensions (mostly identical for manufacturing purposes) if a 4-wheel steering upgrade is desired). The car would be a town car w/ a low top end & higher CD, lower acceleration, with a stance more like a pit bull than a greyhound 🤓
Long story short, until reading your comment (and it still might be so), I had about given up on e-motor full braking. Any chance that a company like Tesla could redesign your servo motors for this purpose? Whatever your answer, thanks for reading this.
@@mikemccarthy1638 I think they might try a rotor with high strength neodymium magnets cut into the rotor and the windings in the stator with tight rotor to stator clearances. This might be too simple an approach but would mimic the larger servo motors with which I am familiar.
Maybe a servo motor designer could comment.
Frank D - Thanks for the feedback. Seems pretty clear a/c servos are eliminated for anything variable.
@@mikemccarthy1638 Mike: We used them for a variable repeating application specifying accel rate, time at set speed and decel rate to stop. We could program any speed function within the capability of the system. Don't understand why this type of servo would not be applicable for variable rate applications. These are not stepper motors.
9 likes no views is what the power of Learn Engineering channel is!
It's not like that 😊 our Engineer are busy in making Tiktok videos
@@Chiku_kadam_1_11 true
Math QUESTION
Algebra question
ua-cam.com/video/KnH1V3lVfRY/v-deo.html
One time watchble.
So amazing, very good animations and very clearly explained.
This must be very new stuff. I studied and toyed around with electrical motors back in college but I never heard of these types of modifications till now. I graduated back in 2018. It's always fun learning about this stuff.
As an electronics engineer with some 50 years experience this reminds me of the brushless dc motor. Semiconductor electronics used to control the rotor.
Kind of like a weird stepper motor I guess.
Magnets have been my weakness but your video made it click with me. Good Video.
Outstanding lesson! Thanks for the information.
Best video I’ve ever seen on the topic. Before I could “explain” this to someone else, but now I can actually understand what I’m “explaining”. Lol
Very good point!
Highly Enlightening Appreciate your efforts
The quality of these videos is amazing!
Very good video, had to watch it a couple of themes to understand it. Amazing minds come up with great innovations
I don’t exactly know what’s happening but it looks revolutionary
This is exactly what I was missing. Finally some engineers gave it a little thought. Tricks with magnetic fields. I'm so glad there is finally this. A good rotor. Took some time. Glad it's here.
Wow one of the best explanation I have come accross
Just amazing please keep posting more videos
Exceptional vid! Great explanation, it is an unusual concept at first glance, but the explanations & graphics are great!
I figure if I watch this about 7 more times, I'll be able to start understanding it a little.
just when im about to graduate as a mechanical engineer, i have to learn a new motor...
nothing new, it is basically the same as a maglev train, which turn's magnet's on and off 100,000 times a second to create propulsion since the 1980's, which can also be used to make EM drive's to replace jet engine's abit like
ua-cam.com/video/Frk1HzYRHJA/v-deo.html
ua-cam.com/video/D39wBjibpvg/v-deo.html fixed ring, magnetic compression for thrust and pulse propulsion, adjusting pulse times to create a constant speed
ua-cam.com/video/QGytW_C6hR8/v-deo.html @ 4m to replace a jet engine
ua-cam.com/video/IeNJ4qOZsxg/v-deo.html what its like in space
You will never stop finding and having to learn about new technologies (or new applications of old knowledge as in this case, made now possible by modern power electronics and control techniques) while you are in Engineering. Welcome to the Club! :)
Hey now, I'm a 1.5 year experience Mechanical/HVAC engineer and now enjoy learning about new types of motors and electrical stuff. Our nuclear plants are chock full of pumps and motors so especially when it comes to upgrading systems knowing the latest tech is nice.
@@Unb3arablePain still old tech, you could achieve better using 2 layers of magnets and include kinetic/thero electric to supply some power, and the same basic system as a maglev train, which also allows turning direct drive wind turbine generators into perpetual generators which only need 20 RPM
but that's the whole point of engineering
5:10 - god thats beautiful.
as a basic electrical student, its awesome to see a synchronous motor start explained (the frequency of the supply currency gradually increasing with a VFD likely)
This is the best explanation I’ve heard. I now understand clearly.
This is fantastic! I love how these motors also don't use any rare earth magnets. Remember when China decided to mess with Japan during one of their periodic bouts of grievance, and cut off Toyota's access to rare earth magnets for their hybrid car motors? That was a huge wake-up call that a rare-earth-free motor of at least comparable performance had to be developed stat. I'm really glad that the most efficient motor also is the most mechanically simple, and doesn't depend on some rare element. The importance of this last point can't be over-stated. This is an absolute game changer.
Need is the mother of invention
This reminds me of the video from the 90s where the electronic salesman is explaining the inner workings of that electric Johnson Controls cabinet..... Lol
Wish I had great videos like this in my university E&M. Would have saved me many hours
Things to learn. Always something new daily. Thanks.
The ease with which he says "We can easily change the speed of RMF by changing the frequency of alternating current."
5:05
Cost has come down a lot for solid state power transformation and control boxes. I think this is the driving factor behind the switch away from classic induction motors.
@@peterdavidowicz4374 exactly one must never limit oneself by the commercial onset
You can control any AC motor with a variable frequency drive. It's hard on the windings if not designed for it, but will still work. A freq. drive simply takes your typical 50/60hz power and converts it into DC, then back into AC at the desired frequency. Typically I've seen from 1-60hz, but I've also seen ranges from 1-300hz. Much easier to get a heavy load moving and control speed/output when doing batch processes this way.
not being an electrical engineer, it was nice to hang out with you smart guys for little while :)
TBH, “electricals” are actually pretty nerdy. If you want to hang out with engineers who are actually cool, “mechanicals” are where it’s at.
@@Skyprince27 Dude - You're all cool. Even the Civil Engineers who as the old story has it build "targets"
@@Skyprince27 nah the best engineer to hang out is my caveman friend who makes tires all day
@@niggacockball7995
Well ya, if he makes tires, he’s obviously a “mechanical”! 😁
@@Skyprince27 what if he's making tires through Electro Discharge manufacturing or using any kind Electro techniques in manufacturing, he's "Electrical" too!😂
Excellent explanation! Keep on great work.
I love this video! Finally understand this design!
Sounds like this is basically a reluctance based synchronous motor, where as most synchronous motors usually use permanent magnets in the rotor. Maybe the best would be a hybrid concept with permanent magnets AND optimized reluctance (like it is done in hybrid stepper motors).
i thought synchronous motors use dc in the rotor to magnetize it for zero slip at high speeds, not permanent magnets?
@@moonasha Both ways produce synchronous rotation, and larger motors tend to not use permanent magnets due to the extra expense, which is considerable for "supermagnets" such as NdFeB and SmCo. Also, there is a startup problem with permanent magnet rotors that is very similar to the problem with SynRel motors; both of those require variable-frequnecy drives for startup. Wound-rotor motors avoid those problems by operating as Induction Motors at low speed, via shorting the rotor windings, then using DC in the rotor windings once they get close to synchronous speed. In modern wound-rotor synchronous motors, both the shorting and the DC power are provided by features _on the rotor,_ eliminating the old-fashioned need for slip rings and brushes.
@@YodaWhat how is the rotor switched off of short? centrifugal switches?
@@moonasha Yes, that's one easy way. They can also use electronic methods as simple as timers, or as complex as frequency counters. The fun part is how modern motors produce DC _entirely on the rotor_ (with the help of modern diodes).
@@moonasha there are different kinds, with permanent magnets you don't need any slip rings and such.
The fact that they can control the angle between iron and magnetic flux is amazing!!! 🔥🔥🔥🔥🔥
i never thought it would ever become possible!
It's all thanks for improvements in instrumentation and controls. These days we have encoders with micrometer resolution. And computers fast enough for real time control. For example we have industrial communication networks that update every 50us. These are used commonly in motion control applications.
Fantastic video thank you so much. Much appreciated!
One of the valuable video I have ever seen on Internet. Thank you...
So this is like a stepper motor for AC? Cool!
imagine people in the past learning about this stuff without youtube
This video is the best explanation to understand the syncronized motors
thanks👏
Very nicely illustrated, thank you.
I understood 10 to 15 percent of the content but damn it was interresting.
Hi, what animation software did you use to make the video ? Really well done.👍🏻🥰🙋🏻♂️ Thanks a lot. Regards Stefan.
Thank you for the video! Comprehensive and on points!
Thanks. Very good, simple and understandable explanation.
i never saw a load angles so real
6:49 “Just by adding one more iron bar perpenDICULAYAIRLY”
I think the narrator just travelled back into the 40s for a second there
Math QUESTION
Algebra question
ua-cam.com/video/KnH1V3lVfRY/v-deo.html
One time watchble.
Eye-Ron Bar got me!
I'm really glad I wasn't the only one that tripped out on that lol
Excellent work!
Thanks for sharing
Thanks everyday I'm trying to teach myself about electronics.
When I was becoming an electrician I remember my instructor saying that induction motors have pretty much maxed out what is physically possible for an electric motor. I guess there was room for a little more!
As earlier comments discussed in detail, they're just more suited for different purposes.
@@lunakid12 I guess there was room for a little more!
When I try to evade school and end up doing it on youtube
Lobe
Lol youtube is more than everything. I learn coding from youtube
you can only learn the working from this video.. However in school it is taught in more details like the equations involved etc.. You simply cannot compare the two here the knowledge is only partial
i learned everything from youtube an nothing from school, school is useless
@@CompanionCube I'm agree with that. However, without school we never know how to physically work together with society, both bitter and sweet condition.
Thanks for the simple and clear explanation....🙏🏼👍
So... basically what you're telling me is that magnets are magic and SynRM motors are witchcraft
And lasers are unicorn-powered. Yes, we all know this.
Hogwarts Dynamic Engineering 101.
No! Warlock
Magnets run the world
@@FonicsSuck so magnets = girls?
Explains why I find half of them repulsive.
I work for a large motor repair shop in the Midwest United States. U.S. Motors/Nidec just let us know that they are dropping support for their higher HP SR motors due to the high failure rates. These do not scale up well and most of our infrastructure is not at all up to date or many industrial environments are not conducive to the drives and electronics required to run these. There is a reason why many steel mills still use and maintain their DC motors that were built in the 40's or earlier. Manufactures may be trying to improve the technological side of their products but the newer built motors have nothing on the older ones in terms of longevity and reliability. My company has motor after motor in for repair, at any cost, just because many places have been bitten by cheaply built modern versions of the tried and tested equipment they have. A couple of our bigger customers tried using SR motors as replacements for some of their DC motors and most of them did not last even a year. Drive failures, rotors coming apart, and housing failures were the most common just to name a few of the many issues.
similar but different scenario at our plant. we recently had new Fanuc Robots put in, as well as an E80 conveyor and shuttle system. high tech stuff, but we are running with old machines going into this high tech packaging equipment. it's not meshing well, due to lower quality packaging and conveyors going into something that relies on perfect alignment. it has caused a lot of downtime due to everyone learning the controls and programming. the system will fault out and disrupt the entire show for quite a while if ya don't know how to manually aligned the Fanuc of shuttle.. (i've saved the day a few times already. told the robot what to think.) This is a case where the production lines need to be upgraded to match the capabilities of our new pack off area.
sow ole beats young,mr young
so many things built around the wartime to '60's in industrial use are still viable and are the backbone of power generation. they just don't build things like they used to with plastics and thin materials that fail if everything is not perfect while the old stuff can take such a beating and still last decades...
@@pauls5745 every three months we rewind the same two D.C. motors from an aluminum mill. They are Reliance 600hp, 1785rpm motors that are ten years old. They weight a total of 4500 each. They are built to tightly for the forced air to cool them efficiently. On the other hand, General Electric the 600hp, 1785 rpm (of which I've personally rebuilt 10) are 9500lbs behemoths built in the fifties the last for the long haul. The last one I worked on the last overhaul on its windings was in 1991. We have become so good at engineering the last penny put of every part and process that we've also forgotten how to practically engineer at the same time. I guess it like the automobile market though. You can only make only make so many widgets before everyone has one. The solution is to engineer a short operating life and planed failures into your widgets so you will always be able to sell a replacement. Create the problem and sell the solution. It's the foundation of a disposable world.
Yes but "Truth" doesn't matter anymore. What matters is how you "Feel" about the motor: ua-cam.com/video/64PKoAiWhjE/v-deo.html
Thank you for your valuable service
very good clarification, canot find a better one
You Are the Best From Algeria
he is from India bro
@@ChandraKiran i'm speeking about myself; I'm from Algeria,
When the L950 LeTourneau came out it this motor was explained as a Switched Reluctance Motor.
Switched reluctance is different than synchronous reluctance. With switched reluctance there a multiple independent electromagentic paths that are switched on and off as the rotor poles approach them. As I recall, something along the lines of 6-12 pole pairs were about the normal number. This is more of a digital type thing similar in concept to full step stepper motors but with smoother torque. With synchronous reluctance there are only three or four electormagnetic paths and those paths vary smoothly in electromagnetic strength and polarity. Where a switched reluctance motor produces an abrupt, fixed intensity magnetic field just ahead of the rotor poles as the poles approach the stator coils, a synchronous reluctance motor smoothly changes the electromagnetic filed strength and frequency to stay a specific angle ahead of the rotor poles. It may seem like a semantic distinction but they are functionally different,
Thanks for the information very helpful to understand the basics of this new motor.
Such a great creative job.... Salut from Egypt my friend....
Induction motor still has its upper edge on that it doesn't need rotor position sensor for driver circuit. So easy operate.
If ones watch this video and easily agree to it's proposal , I think its too plain.
Frankly if I see this of benefit , I'd go servo motor (Permanent magnet motor). Because they use the same drive technique with more efficiency.
If somehow SynRM becomes Free of Software assisted starting running then they could. have Revolutionized the motor industry in a very efficient way
computers are getting cheaper. what's the problem with software?
@@samueladitya1729 Cost of conversions specifically for 3rd world countries Besides computer alone can not run these motors they need specifically arranged IP66 Ingress protected drives in harsh industrial environments along with Interchangining of Rotors as well
New and interesting to me/many because SCIENCE!👍 Thumbs up and subscribed!
Thank you so much for this video!
3:12
it kinda bothers me that the axel of the iron bar is completely neglected here.
Lol!
Totally saw that, thankyou very much!
So that's why early electric clocks needed to be manually spun in order to get them to start.
Loved the explanation. Good job team .
absolute unit of quality content
Okay, that was WAY over my head. Still, ya want to get smart, listen to smart people!
Dont know why this was in my feed but I feel slightly smarter having watched it
Very informative ❤️
I learned alot from this channel
Definitely informative! Great vid 👍
“The late 1900s” wow that made me feel older than I should feel!
LOOLLL yeahh they wrong for that XD
"The late 1900s' means 1906 to 1909 and even I was not around then!
Can I get one in my Dewalt?
Definitely have a better understanding that I need a better understanding. But that's more a me problem. Very nice vid, thank you!
It’s an awesome clear explanation. I am just wandering how big the motor world is then this video shows
So its basically a synchronous motor with a variable speed drive
not really as excitation cannot be controlled to improve power factor as in a syn. condensor
The axle in the “I-Ron” bar has a mislocated axle at 3:09.
Noice observation
Yeah it bugged me too
That was awesome! Thank you!
Some points from my side based on my little knowledge
(1) SynRM starts as Induction but later runs as Synchronous
(2) They are controller driven motors
(3) They have minimum 4Poles/Phase so the most simple SynRM which is 3 Phase will have 12 Poles or 12 Stator teeth
(4) The commutation logic is to fire single phase at a time keeping other two open but firing each Phase at a well controlled sequence such that a rotating Magnetic field will be generated
(5) At start we always Fire those poles which results in highest gradient between high and low reluctance paths so that starting torque can be generated but once speed increase the rotor will get magnetically locked with stator field
(6) They do not have any back EMF as a result of which they can run to higher RPM around 50,000
(7) Due to lack of back EMF the controller is not complex in design but controller logic is difficult to optimize
So one question, the laminations seem to have a really thin rim, that could cause rotors to break how is that adressed? Also doesn't using a non magnetic shroud solve the issues?
Exo Zen You adjust the thickness of the rim according to maximum rpm of your motor design. Lesser max rpm needs less rim.
@@kazedcat But a thicker rim would make it perform worse right?
@@omegaelixir The effect is negligible since the rim is not in the path of the magnetic flux lines. But if your rim thickness is half the length of your radius then that would have significant effect. You would need to use proper mathematical analyses to fully determine the effect since it is not linear.