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Thread: speed control on pump motor

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    speed control on pump motor

    I have a 1.5 hp hayward pump. Can I put some kind of speed control on the motor to get variable speed or will that damage motor?

    If not can I swap out motor instead of buying entire pump?

    it's a matrix power flo matrix with ao smith motor


    24ft x 54" aquasphere mission agp, cartridge filter, 1.5 hp hayward, TF-100, BBB method, pool install July 2010

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    guamguy's Avatar
    Join Date
    Feb 2010
    Guam, USA

    Re: speed control on pump motor

    If you want a 2-speed pump, you're going to need to swap the motor for a 2 speed motor. Variable speed, you'll need a new pump. I just did a motor swap on my 1hp Sta-Rite and it was really easy, only a couple hours work. Good luck!
    12,800 gallon IG plaster kidney-shaped pool, waterslide, 800 gallon spa.
    1HP 2 speed Sta-Rite pool pump, 1.5 HP Sta-Rite spa jet pump. 2 skimmers, 1 main drain
    Purex-Triton TR-60 325 lb.sand filter. 2" Plumbing, Intex SWCG, TF-100 test kit.
    Link to pics of my pool!

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    Mod Squad Bama Rambler's Avatar
    Join Date
    Jun 2009
    SouthWest Alabama

    Re: speed control on pump motor

    If you had a 3-phase pump it'd be easy to put a drive on it but with a single phase, it's gonna require a new motor. As GuamGuy said, it isn't a hard job. I recommend replacing the shaft seal when you change the motor just for good measure.
    Dave J. TFP Moderator
    24' x 52" Round AGP. 2hp/¼hp SPL Power-Flo 2-speed pump. 200sqft Waterway Cartridge Filter. 45MHP2(3GPD) Stenner Peristaltic Pump
    Pool School ----- Pool Math ----- TF-Test Kit

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    mas985's Avatar
    Join Date
    May 2007
    Pleasanton, CA

    Re: speed control on pump motor

    They do make single phase variable frequency drives but by the time you purchase the drive and the enclosure, you might as well upgrade to a variable speed pump. Also, a standard motor usually does not have the appropriate bearings for a variable speed drive so you will likely shorten the life of the motor.
    Hydraulics 101; Pump Ed 101; Pump and Pool Spreadsheets; Pump Run Time Study; DIY Acid Dosing; DIY Cover Roller
    18'x36' 20k plaster, 1/2 HP 2sp pump, Aqualogic PS8 SWCG, 420 sq-ft Cartridge, Solar, 6 jet spa, 1 HP jet pump, 400k BTU NG Heater, ThePoolCleaner

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