Size restraints of a DC motor.

Discussion in 'General Electronics Chat' started by bladerunner, Nov 22, 2012.

  1. bladerunner

    Thread Starter Member

    Apr 15, 2012
    83
    4
    In my endeavor to change a 115 VAC pump motor to a VDC motor I forgot one thing. The size (dia.) difference of the motor(s).

    I can get a DC motor that is similar in the torque and other parameters to the AC motor. However, the DC motor is roughly half the size. The smaller DC motor is a permanent magnet type. Since the shaft size is of the utmost importance, what about the outside diameter of the motor(s) themselves.

    Are there any resulting problems (electrical or otherwise) that would be caused by the size difference that I should be aware of ? Connecting the pump to a smaller motor should be no problem for a Red-Neck like myself. Its the other problems I don't know about or see that I worry about.

    Thank You for any help.
     
  2. crutschow

    Expert

    Mar 14, 2008
    13,024
    3,236
    DC permanent magnet motors can be smaller than an AC motor since they don't need as many windings. The only size consideration that's of concern is fitting it into the available space.
     
  3. bladerunner

    Thread Starter Member

    Apr 15, 2012
    83
    4
    just what I wanted to here.

    Thanks
     
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