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.

 

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.

 

just what I wanted to here.

Thanks