2-Speed Motors and VFD? - The Home Machinist! Feb 17, 2012With regard to 2-speed 3-phase motors and VFDs, there is little reason why you need switching to connect wiring for both speeds (and many VFDs don't like switches between them and the motor). Most 2-speed motors have a higher HP rating on the high-speed winding so it's probably best to permanently connect the VFD on the high speed winding and LEESON 3-Phase Two Speed Motors - Electric Motor Wholesale LEESON Three Phase TEFC Two Speed Variable and Constant Torque Motors are a single winding design. These totally enclosed fan cooled designs are priced competitive to other manufacturers' drip-proof two-speed, single winding motors.
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