What kind of motor does the "newer" variable speed perm magnet pumps use

[steppinthrax]

See how expensive they are. It seems to me much of the expense is in the fact that they have a digital computer circuit and a perm mag motor. Is the motor simply a DC "type" treatmill motor. Because if this is the case you can get them pretty cheap and then use a Full Wave Rectifier to the motor.

 

[mas985]

Re: What kind of motor does the "newer" variable speed perm magnet pumps use

The motors are designed specifically to work with a VFD to minimize arcing. They have a PM rotor and a winding stator but effectively they are AC driven albeit PWM AC. So no the motor is not a common treadmill motor nor is the drive a simple full wave rectifier. The drive is a VFD which converts the AC to DC but then converts the DC to a PWM waveform. You can read more about it here:

http://www.pumped101.com/index.html#variable_speed_pumping

 

[RobbieH]

Re: What kind of motor does the "newer" variable speed perm magnet pumps use

I would love a 3 phase pump. Problem is, I am probably in the very small minority of homes that have 3 phase.

 

[steppinthrax]

Re: What kind of motor does the "newer" variable speed perm magnet pumps use

How about a 240 pump v.s. a 115?

 

[jblizzle]

Re: What kind of motor does the "newer" variable speed perm magnet pumps use

All but the smallest 2 speed and all the VS pumps are 230 volt.