from the Automation List department...
Speed control for 1ph AC motor w/o drive
Motion control, servos, steppers, etc. topic
Posted by Drake on 8 September, 2003 - 7:19 pm
Looking to control the speed for a 1ph AC reversing motor without using a drive. Is this possible to accomplish?

Posted by Curt Wuollet on 10 September, 2003 - 10:51 pm
Generally, no, most are synchronous and are best speed controlled by frequency. Simple methods like varying voltage run the motor in modes they don't like, like constant slippage. If the hp needed is very low, this may work, but testing is needed to ensure the motor won't stall or overheat. Some special motors can be controlled this way like some ceiling fans. The good news is that vfds are becoming fairly inexpensive.



Posted by Anonymous on 13 September, 2003 - 4:18 pm
What is the HP? Is it designed to run varable speed? Does it have a starter switch ( Click after it's turned on/off) these type can only be lowered to 80% then the starter switch kick on.

Posted by Phillip Wade on 28 September, 2003 - 3:06 pm
forget it. You have a motor and that's all. You need something more because you can not make a variable speed system from nothing.

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