![]() ![]() Totally enclosed VFD's are scarce, but it is simple to enclose and cool them so chips will not get in. Similarly, you have to keep chips out of the VFD. ![]() That is why you need a TEFC motor around machine tools. Single phase motors have exposed hot components inside around the centrifugal starting switch. Possibly the old GE motor failed because it ate some chips. I won't go into the reasons here, but I would look for a 3 phase 1 HP 240 V 1150 RPM motor and VFD to replace a 1/2 or 3/4 HP 1725 RPM single phase motor.Īs for source, I just watch eBay for low prices on motors and VFD's with the specs I want. I also prefer a lower nameplate speed on the motor. I prefer to use a larger HP motor than originally called out for the machine when using a VFD. ![]() The motor can be rated from 208 to 240 and will still work OK. VFD's are very tolerant of voltage variations on both input and load. For the benefit of someone who is unfamiliar with three phase and VFD controls: Several VFD makers (also called AC drives) make a VFD that will run a 220 V three phase motor of 1 HP or smaller off an ordinary 110 V household outlet. ![]()
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