The company is Festo Didactic / Lab Volt. They are quite expensive, but take a beating from the students. Our units are over 10 years old now. If you do contact them, please mention that you became aware of their products through my UA-cam channel. Here is the link: www.labvolt.com/solutions/6_electricity_and_new_energy/59-8001-60_0_2_kw_electromechanical_training_system
Nice. You did not show the RPM, current, voltage drawn. May be an oscilloscope showing the surge current, etc., would make your videos a complete reference. Thanks.
Hi Pete. I would like to say thanks for all those videos you uploaded in the past. They are very helpful. You did a great job in explaining the operation of the motor. I look forward to other educational videos you will upload in the future.
Thank you Pete I was scratching my head in college as I couldn't understand what series really meant, whether the armature got connected or winding. This video clarifies the doubts very clearly
Thanks for explaining this really well! I'm preparing for my A&P oral and practical and this really helps. Always great when I understand things so I don't have to memorize much! :)
Hey Pete, I'm studying Marine Engineering at "Copenhagen School of Marine Engineering". Your videos are a great help for my electro courses! Keep up the great work! Greetings from "the other side of the pond".
Awesome video, i have a dc motor where i work, i went to trouble shoot it and i usally get a resistance reading between A1 and A2 but its showing like its open. I have resistance between the field wires but nothing like its open between Aramture wires. Does that mean my motor would be bad? Thanks a
I have a small motor like this but its not wired this way where the windings have a long jump line. The two windings are connected together but kept separate by the brush and armature. I think its way less confusing to be wired that way since the way its wired on the diagram is the way its wired irl. Whereas in the vid that jumper wire can cause some confusion.
In series circuits the current remains the same throughout the circuit and the voltage divides among resistor values according to OHMS Law. OHM's Law states Voltage = I (current) (multiplied by) R ( resistance). When there are different resistors in a series circuit the current (multiplied by) each resistor creates a voltage drop across each resistor, meaning there can be a voltage divider circuit in series circuits. We can vary the voltage with a variable resistor control before the motor. Meaning a group of series motors can be controlled by one variable resistor.
nice video! i have a question. it's kinda silly but here i go... i know that "universal motors" are quite similar to "series dc motors" in a way. basically they are modified to withstand ac working conditions. my question is if overspeeding issue is related to the current type. can these motors still overspeed on AC just like they do on DC?
In fact, like a series-wound DC motor, running a universal motor with no load (zero torque) could lead to a runaway condition, where the speed increases until the motor begins to break apart. www.motioncontroltips.com/how-can-universal-motor-operate-dc-ac-supply/
What about the Delta Motor Configuration hooked up in a series winding style , which means it will be much more a current driven Delta winding Motor configuration?
Culd you please tell my how culd I change for exampel my starter motor speed culd I use external winding with my field windeing to inteade torque ore speed? And I have 1 more question my alternator is giveing my trobel culd I add extra external coils out side alternator simulating extra windings?to gain more power from the alternator?and If I culd change the starting charge rpm on my alternator how wuld I do it? My engine is slow reving around 300rpm its back charging causeing my trobel I wuld like to modify that thing to start charging baterrys under low speeds at full power. I dont know some tractor alternators have capacitors on them so Im not shure if I culd use somthing similar like that to help solve my problem. Im useing some times plazma ignition ordinary ceramic capacitors to ignition coil + and other side of hv capacitor to ground. There are some nice effects my starter motor spins faster on start up engin is low quaeter runing but my starting charge on alternator from 1k rpm goes to 2500 rpm at 15v out put thats anoying to my how wuld I stop that from acuring to my alternator? Culd I modify my alternator seperatly and not effect my other devices ore wire harnest? Are there some known methodes that I can use ore cinde of compound windings?
In series there can be a voltage divider among resistors, where as the current remains the same, meaning a variable resistor in series with series motor can produce a voltage drop across the variable resistor , varying the voltage at the series motor even though the current remains the same.
so I am not doubting you, but I have made use of many DC motors over the years, almost all have been series wound. I usually run them from simple power supplies, nothing that has any current limiting capabilities, yet I have never seen a motor run away like the one you demonstrated. Can you offer any explanation as to why that's never happened?
@@PeteVree first of all, thanks for the quick response, did not expect that on a 2 year old video. So it seems I got the terminology wrong, most of the motors I have worked with are permanent magnet dc motors. I cam across this video (actually you one on parallel dc motors) in the middle of a deep dive into learning about more advanced motor types and when I posted, I was high on information and very confused. As a side note, I had just replaced a motor on a project, for the 3rd time and with a beefy motor. So I had some time in on bearing blocks, pulleys , mounts and a new power source for this 110VDC motor. The machine in question must spin in one direction and has a DPDT reversing switch on the DC control circuit to accomplish this. So I have this new, sizable motor, mounted really nicely all the electronics were bench tested and sure enough the direction is backwards. I flip my reversing switch and try again, still backwards....a true wtf moment...i was pissed at this point and madly perplexed. Found your video on shunt motors, a little snip-snip and soldering, back in business. Thanks for your help out of that bind.
The back EMF is absolutely SOMETHING. It rises in proportion to the RPM of the motor until it equals the voltage of the source. That, combined with friction losses, limit the speed of the motor. It's not going to spin up until it tears the fabric of space-time.
On a Shunt or compound wound, but on a series wound, it will accelerate itself to death. Back EMF can never be greater than Applied EMF and since the field and armature current reduce on a series wound motor, there's always something left to keep it going.
It would still run at high RPM's but wouldn't destroy itself. With a load, the cEMF is given enough time to generate and reduce the current to the armature.
There is a lag in timing between the current going into the motor and the CEMF being generated on the Armature. The CEMF is there, and increases with the speed of the motor, it just isn't being generated fast enough to slow down the motor.
Any idea where I can get one of those?
I work for the railways and this is some great didactic material.
The company is Festo Didactic / Lab Volt. They are quite expensive, but take a beating from the students. Our units are over 10 years old now. If you do contact them, please mention that you became aware of their products through my UA-cam channel. Here is the link: www.labvolt.com/solutions/6_electricity_and_new_energy/59-8001-60_0_2_kw_electromechanical_training_system
Nice. You did not show the RPM, current, voltage drawn. May be an oscilloscope showing the surge current, etc., would make your videos a complete reference. Thanks.
@@PeteVree we had 12 sets of labvolt at school it was donated in the 1970s. Yes it is very expensive. the school could not afford to buy one.
Po
L
Hi Pete. I would like to say thanks for all those videos you uploaded in the past. They are very helpful. You did a great job in explaining the operation of the motor. I look forward to other educational videos you will upload in the future.
Thank you Pete
I was scratching my head in college as I couldn't understand what series really meant, whether the armature got connected or winding.
This video clarifies the doubts very clearly
Thanks for explaining this really well! I'm preparing for my A&P oral and practical and this really helps. Always great when I understand things so I don't have to memorize much! :)
Hey Pete,
I'm studying Marine Engineering at "Copenhagen School of Marine Engineering".
Your videos are a great help for my electro courses! Keep up the great work!
Greetings from "the other side of the pond".
Thanks for the kind words Mathias. All the best. Pete
Crystal clear explanation. Thank you.
Excellent description. Thank you.
Thanks for the info Pete. My lathe has a carriage feed motor that is shunt wound with a speed control knob. Now I know why. Thank You.
excellent explanation.. many thanks!
Nice lecture on series DC motor thank you Pete
A Masterpiece ! Thx ! 👍
Thanks a lot, You saved my ass. We don't understand a work that our college professor teaches
Awesome video, i have a dc motor where i work, i went to trouble shoot it and i usally get a resistance reading between A1 and A2 but its showing like its open. I have resistance between the field wires but nothing like its open between Aramture wires. Does that mean my motor would be bad? Thanks a
I would check the brushes. If they are not making good contact with the commutator, that might explain the high resistance reading.
Does the rpm max out in relation to voltage or does it just keep getting faster regardless of voltage in?
Without a load to slow it down just a bit, the rpm will continue to increase regardless of the voltage.
excellent! very solid content.
Interesting and good explanation. Is it true that series motors work on both AC and DC?
In theory yes. But a true Universal Motor has inductive compensation in order to work on AC
Thanks a million for the knowledge.
If you parallel the armature and the stator. Would it make more power as the current would increase substantially.
Thank you so much
I have a small motor like this but its not wired this way where the windings have a long jump line. The two windings are connected together but kept separate by the brush and armature. I think its way less confusing to be wired that way since the way its wired on the diagram is the way its wired irl. Whereas in the vid that jumper wire can cause some confusion.
In series circuits the current remains the same throughout the circuit and the voltage divides among resistor values according to OHMS Law. OHM's Law states Voltage = I (current) (multiplied by) R ( resistance).
When there are different resistors in a series circuit the current (multiplied by) each resistor creates a voltage drop across each resistor, meaning there can be a voltage divider circuit in series circuits.
We can vary the voltage with a variable resistor control before the motor.
Meaning a group of series motors can be controlled by one variable resistor.
Only the Shunt DC Motor is used for Speed Control with a DC Drive. new.abb.com/drives/dc
nice video!
i have a question. it's kinda silly but here i go... i know that "universal motors" are quite similar to "series dc motors" in a way. basically they are modified to withstand ac working conditions. my question is if overspeeding issue is related to the current type. can these motors still overspeed on AC just like they do on DC?
In fact, like a series-wound DC motor, running a universal motor with no load (zero torque) could lead to a runaway condition, where the speed increases until the motor begins to break apart.
www.motioncontroltips.com/how-can-universal-motor-operate-dc-ac-supply/
Nice job, keep it up.
What about the Delta Motor Configuration hooked up in a series winding style , which means it will be much more a current driven Delta winding Motor configuration?
Culd you please tell my how culd I change for exampel my starter motor speed culd I use external winding with my field windeing to inteade torque ore speed? And I have 1 more question my alternator is giveing my trobel culd I add extra external coils out side alternator simulating extra windings?to gain more power from the alternator?and If I culd change the starting charge rpm on my alternator how wuld I do it? My engine is slow reving around 300rpm its back charging causeing my trobel I wuld like to modify that thing to start charging baterrys under low speeds at full power.
I dont know some tractor alternators have capacitors on them so Im not shure if I culd use somthing similar like that to help solve my problem.
Im useing some times plazma ignition ordinary ceramic capacitors to ignition coil + and other side of hv capacitor to ground. There are some nice effects my starter motor spins faster on start up engin is low quaeter runing but my starting charge on alternator from 1k rpm goes to 2500 rpm at 15v out put thats anoying to my how wuld I stop that from acuring to my alternator? Culd I modify my alternator seperatly and not effect my other devices ore wire harnest? Are there some known methodes that I can use ore cinde of compound windings?
In series there can be a voltage divider among resistors, where as the current remains the same, meaning a variable resistor in series with series motor can produce a voltage drop across the variable resistor , varying the voltage at the series motor even though the current remains the same.
Thanks Pete.
so I am not doubting you, but I have made use of many DC motors over the years, almost all have been series wound. I usually run them from simple power supplies, nothing that has any current limiting capabilities, yet I have never seen a motor run away like the one you demonstrated. Can you offer any explanation as to why that's never happened?
They were all physically coupled to a mechanical load?
@@PeteVree first of all, thanks for the quick response, did not expect that on a 2 year old video. So it seems I got the terminology wrong, most of the motors I have worked with are permanent magnet dc motors. I cam across this video (actually you one on parallel dc motors) in the middle of a deep dive into learning about more advanced motor types and when I posted, I was high on information and very confused.
As a side note, I had just replaced a motor on a project, for the 3rd time and with a beefy motor. So I had some time in on bearing blocks, pulleys , mounts and a new power source for this 110VDC motor. The machine in question must spin in one direction and has a DPDT reversing switch on the DC control circuit to accomplish this. So I have this new, sizable motor, mounted really nicely all the electronics were bench tested and sure enough the direction is backwards. I flip my reversing switch and try again, still backwards....a true wtf moment...i was pissed at this point and madly perplexed. Found your video on shunt motors, a little snip-snip and soldering, back in business. Thanks for your help out of that bind.
Nice. Glad everything worked out.
Does A2 hooks up directly to negative of the DC power source?
in this diagram yes.
I thought the TITLE was about connected various DC MOTORS in parallel vs in series, and what effects would that have on the voltage across the motors.
The back EMF is absolutely SOMETHING. It rises in proportion to the RPM of the motor until it equals the voltage of the source. That, combined with friction losses, limit the speed of the motor. It's not going to spin up until it tears the fabric of space-time.
On a Shunt or compound wound, but on a series wound, it will accelerate itself to death. Back EMF can never be greater than Applied EMF and since the field and armature current reduce on a series wound motor, there's always something left to keep it going.
@@PattyODoors I admit, I was speaking beyond my area of expertise... I concede! Thanks.
Can this motor be used as a sepex motor ?
So series motors work on both AC and DC?
In theory yes.
What would happen if I put some load on it.
Please reply.
It would still run at high RPM's but wouldn't destroy itself. With a load, the cEMF is given enough time to generate and reduce the current to the armature.
What is the voltage of the power source of the DC motor in this video?
120V DC
why can't back emf produced oppose the armature current....??..🤔please explain.....
There is a lag in timing between the current going into the motor and the CEMF being generated on the Armature. The CEMF is there, and increases with the speed of the motor, it just isn't being generated fast enough to slow down the motor.
@@PeteVree oh ok done I understood now...btw thanks for replying 😄 .your video was awesome ❤️
👍👍
I want 4 pole dc series motor circuit diagram plz.with inter pole
😋
that motor sounds awfully unbalanced
Jdzj