Not for this motor

Posted by Mark Kelly (M) on August 14, 2012 at 23:07:44

In Reply to: Balanced power supply? posted by CometCKO on August 14, 2012 at 19:08:25:

The further info suppled by Banpuku makes it obvious that this is a two phase motor not a three phase one. His initial mention of three motor wires sent me off on a tangent.

For a three phase motor it is certainly possible to build a three phase drive. See article from Clarisonus but note that I don't use this design any more as it's a bit tweaky to get right. Also note that I think the scale on the speed / torque curve is wrong, the actual speed at the torque plateau should be 1800 RPM.

Optimal frequency is determined by rotational speed required, as it is for any synch motor. Simply multiply the speed by the number of pole pairs and divide by 60 eg for a 6 pole motor (3 pairs) running at 1200 RPM the required frequency is 3 x 1200 / 60 = 60 Hz.

Optimal voltage depends on application and usually there's a tradeoff between noise and dynamics. I always make it variable so it can be tweaked to suit. Rated voltage is always a good place to start.

Current follows voltage unless you build a constant current supply. I've tried that and didn't think it offered anything interesting.

Mark Kelly

http://www.clarisonus.com/blog/?p=92 (Open in New Window)

This post is made possible by the generous support of people like you and our sponsors:

Follow Ups Full Thread

Topic - Need help with Ashland motor and capacitor - banpuku 09:43:38 08/13/12 (19)

RE: Need help with Ashland motor and capacitor - Richard P 10:25:55 08/14/12 (3)

RE: Need help with Ashland motor and capacitor - banpuku 10:52:48 08/14/12 (2)

RE: Need help with Ashland motor and capacitor - Richard P 07:16:14 08/15/12 (1)

RE: Need help with Ashland motor and capacitor - banpuku 09:21:06 08/15/12 (0)

Steinmetz connection - Mark Kelly 03:38:05 08/14/12 (9)

Balanced power supply? - CometCKO 19:08:25 08/14/12 (2)

Not for this motor - Mark Kelly 23:07:44 08/14/12 (1)

What a coincidence! - CometCKO 14:28:10 08/15/12 (0)

RE: Steinmetz connection - banpuku 05:11:32 08/14/12 (3)

RE: Steinmetz connection - banpuku 10:53:24 08/14/12 (0)

Post a phot - Mark Kelly 05:52:56 08/14/12 (1)

RE: Post a phot - banpuku 06:02:03 08/14/12 (0)

RE: Steinmetz connection - banpuku 04:33:58 08/14/12 (1)

Beyond me. - Mark Kelly 05:46:39 08/14/12 (0)

RE: Need help with Ashland motor and capacitor - MikeWI 12:43:41 08/13/12 (2)

RE: Need help with Ashland motor and capacitor - banpuku 14:51:44 08/13/12 (1)

RE: Need help with Ashland motor and capacitor - MikeWI 09:41:25 08/14/12 (0)

The Ashland Motor company is still in business. - tubesforever 10:51:13 08/13/12 (1)

RE: The Ashland Motor company is still in business. - banpuku 14:52:07 08/13/12 (0)

Follow Ups

Not for this motor - Mark Kelly 23:07:44 08/14/12 (1)

What a coincidence! - CometCKO 14:28:10 08/15/12 (0)

Not for this motor

Post a Message!