| Electronics > Projects, Designs, and Technical Stuff |
| Motor control using TRIAC |
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| danjenkins:
Can I control the speed of a single phase AC motor by using TRIAC? Is it possible to trigger the TRIAC gate using PWM pulse? The motor in question is a Leeson. https://www.regalbeloit.com/Products/Catalog?model=103783.00 Or is a variable frequency controller like the following a better option? https://www.valinonline.com/products/esv251n01sxb |
| beanflying:
Yes but no and it depends :) What is your use for the single phase motor? Permanent Capacitor motors don't develop much starting torque and in particular if you are trying to start with any speed control you are asking to stall it and cause you some issues. The VFD you linked to is 3 phase output you can get single phase VFD's and they are compatible with permanent Cap motors such as you have or intend using. High Turndown rates on single phase motors also have some heating among other issues. So what range do you need? Triac control of motors sucks period power factor, heat, poor regulation but it is cheap. If you don't have the motor yet seriously consider three phase or DC. |
| Zero999:
It depends on the motor and the load. If it's a load which doesn't need a high starting torque, such as a fan, it will work perfectly, but don't use PWM, use phase control. PWM using a TRIAC would need a lower frequency, than the mains, which would just cause vibration, the current being drawn in huge spikes and overheating. If it's something which requires a lot of torque, then you need a variable frequency drive. |
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