Speed Control - AC and DC Motors
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- Опубліковано 1 жов 2024
- Better understand how to vary the speed in electrical motors. Both AC and DC motors.
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Difficult to follow. Not enough visuals at the beginning: what you hear you forget (if you understood in the first place). Surprising shortcoming for an Educator!
David, thank you for your input. We are always looking for ways to improve our videos and education series and implement more visuals in the future. Have a great day.
Hi I have a 1.1kw extractor fan, €300 it cost, Chinese made, can a normal fan speed controller work on this motor do you think? The fan speed controller was a €15 one from amazon I hooked up to it, it worked well to lower the speed but after only 2 hours of running the motor tripped the RCD and smoke coming from motor
Part of me thinks it may have been just a low quality motor with a fault in it but do u think it was the controller I was using?
The motor is trash now btw just keeps tripping rcd
It sounds like you experienced some concerning issues with your extractor fan and the fan speed controller. While it's possible that the motor itself could have had a fault, the symptoms you described-tripping the RCD and smoke coming from the motor-suggest that there may have been an issue with the fan speed controller.
Cheap or incompatible fan speed controllers can sometimes cause problems like this, especially when used with motors they weren't designed for. It's essential to ensure that the controller is compatible with the motor's specifications, including its power rating and type.
To avoid similar issues in the future, I'd recommend investing in a high-quality fan speed controller that is specifically designed for use with your extractor fan motor. Look for controllers that are compatible with the motor's voltage, power rating, and type (e.g., single-phase or three-phase). Additionally, consider consulting with a professional electrician or HVAC technician for guidance on selecting the right controller for your setup.
If you suspect that the motor itself may be faulty, it's also a good idea to have it inspected by a qualified technician to determine the cause of the problem and ensure safe operation.
There was absolutely no mention about using a PWM method to control the speed of a DC motor with constant voltage.
Because you would have to have an oscillator. Or start with AC current.
I'm not convinced about speed control by changing frequency, it could burn out
Okay thanks so much from Algeria
Hi Nice video. Just wanted to know if we can controll the speed of an Exhaust fan motor with a regulator
You can use a rheostat on a tiny motor, but a PWM does a terrific job on other DC motors. How are you using a PWM with AC? I was under the impression that a PWM
was for DC only.
I was puzzled by the same question:
The way I was taught is PWM for DC motors and VFD for AC motors. I believe that his explanation is very unclear.
DC has no frequency. So you would have to start with an AC circuit or use an oscillator.
Thanks dude
Hi, you talk about controlling speed of a motor but you don't mention that you will have less power when the voltage is decreased. For example, let's say I have a large machine that needs a lot of torque so I want to lower the speed but maintain the torque how would I do that without losing power from the motor. Thank you
Good question!
Unfortunately, when you decrease voltage (or narrow pulse width) for a DC motor, you decrease both speed and torque. Use a gear box to exchange torque and speed.
However, if you want to slow down a motor and maintain torque, use an AC (induction) motor with a variable frequency drive. The drive shaft is literally synchronized (locked) to the incoming sine wave!
@@foureyedchick very good.
Is the flux control method better for higher voltage dc motors then the armature control method?
awesome detail introduction mate thanks heaps
No problem 👍
Good good
Great
I have 3 leeson 3/4 Motor #C42D17FK7D WHAT CAN I USE FOR SPEED CONTROL FORWORD,STOP & REVERSE & to turn it on?
Thanks
I am here for the methods of AC Motor speed control not covered in this video.
Can these be added to a vintage Dunlap 1/4HP split phase 60 cycle / 5 amp electric motor?
How do I find what kind of speed sensor my electric motor has.
Totally doesn't make sense. So you are saying when you decrease the current to the motor it will go faster? Maybe under no load. That is like saying when you take your foot off of the gas pedal the cars engine will go faster. You also need to put torque and power into this equation. Are you also saying if you decrease the current to the motor it will have more power? Of course that would be nonsense.
And when you decrease the voltage supply to the motor, that is the same as decreasing the current to the motor. I = V/R. Current and voltage are directly proportional.
You would have to show an electrical diagram to make sense of what you are saying. You could be right, but you surely didn't explain anything regarding DC motors.
Decreasing the voltage to decrease the speed of course makes sense. The first part.
Man!
If there are other AC control techniques that are not covered in this video, at least the names should be mentioned.
Great video!
Yesss
2:00 increase or decrease?
I need some help . I bought an electric scooter in China. The motor watts are 1500w. The bike barely goes 47km/Hr. I know it can go faster but the regulations require to limit all electric bikes to less than 60km/Hr. The manufacturer told me the bikes are modified to limit them at 47km/Hr. The speedometer still maxes out at 67km/Hr. But the bike doesn't accelerate beyond 47kmph. I know that tweaking the controller might fix this problem. Because the motor has enough wattage to achieve a speed of 67km/Hr. I need some advice. Should I change a modulator ? Which one would be suitable ? The batteries are rated at 72V20Ah.
you can't really tweak the controller. Put bigger wheels on it and it will go faster. Use a pulley ratio calculator to get the size you need
Can you SHOW???????
Hi came across your channel first time today
In your opinion, can I use a 4000W 220V AC SCR Voltage Regulator. To lower the speed of a single phase 1/2 HP motor. 🥴
yes you can. The 4KW means nothing when you are powering a 1/2 HP motor. The motor will only take what it needs. You seem to be lacking a fundamental understanding of Ohms law. You cannot power up a 4KW motor with a 1/2 HP drive.
easily understand
Thank you
Nice video🙏
Interesting concept