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Thread: Convert 1 Phase 1 HP Motor to Variable Speed ?

  1. #1
    Join Date
    Jun 2012
    Laurinburg NC

    Convert 1 Phase 1 HP Motor to Variable Speed ?

    Is there anyway to convert a 1 phase 1 HP motor to variable speed without 3phase without step pulleys ? I want to do away with the Reeves drive on my Jet 1442VS lathe also.

  2. #2
    Join Date
    Oct 2006
    somewhere east of Queen Creek, AZ - South East of Phoenix
    In short no. You can get an three phase VFD that will run on single phase power then you will need to change the motor to a three phase motor.
    "There’s a lot of work being done today that doesn’t have any soul in it. The technique may be the utmost perfection, yet it is lifeless. It doesn’t have a soul. I hope my furniture has a soul to it." - Sam Maloof
    The Pessimist complains about the wind; The Optimist expects it to change;The Realist adjusts the sails.~ William Arthur Ward

  3. #3
    Join Date
    Jan 2007
    Sacramento, CA
    You can do it with a PWM - which varies the frequency of the 60hz power from the city. You'll likely find that they cost more than a new DC motor and controller, usually, though.

    This question comes up quite often and sadly the short answer, like Don said, is no. Induction motors rely on the frequency of the AC power coming in to set their speed. Dimmer switches and router speed controllers don't vary the frequency, just the voltage. With induction motors, a drop in voltage means it will pull more amps which leads to more heat or blown circuits or worse - a smoking motor. Routers and other "universal' motors actually rely on the voltage to set their speed - most of them actually run just fine on DC current, too - which can't be said for induction motors.
    Jason Beam
    Sacramento, CA

  4. #4
    My understanding was that LEESON FHP Series could do that. LEESON FHP Series drives would take in single phase & give a single phase or three phase output.

  5. #5
    Join Date
    Nov 2012
    Wapakoneta, OH
    You can get single phase input/single phase output drives, but they have to be used with permanent split capacitor motors (or shaded pole single phase motors.). I 'm not sure what a shaded pole motor is, but when i had a day job had a few applications that permanent split capacitor motors with a drive. Regardless, it can't be done with your existing motor and changing it out would be best done with a 3 phase motor and a cheaper VFD. It would probably cost more than the lathe.

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