Parallel Path Magnet Motor

scianto · September 19, 2010, 04:46:34 PM

I just uploaded a short video of another tests, in which the parallel path magnet motor SRSM3 is shaft coupled with 1 kW old military soviet DC generator.
http://www.youtube.com/watch?v=IDyPNVHYaJw .

Ted Ewert · September 20, 2010, 01:25:15 PM

Quote from: scianto on September 19, 2010, 04:46:34 PM
I just uploaded a short video of another tests, in which the parallel path magnet motor SRSM3 is shaft coupled with 1 kW old military soviet DC generator.
http://www.youtube.com/watch?v=IDyPNVHYaJw .

Interesting test, and well done. Thank you for making all the measurements clear and easy to read, (and for the use of subtitles).
You mentioned that the generator had it's highest efficiency at 3k rpm. During the 39 volt test, the system showed a 30% overall efficiency under load. When you dropped the voltage down to 29 volts, the RPMs decreased further and the generator presumably became even less efficient. Yet the overall efficiency went up to 36% into the same load. How would you account for this?

Ted

scianto · September 20, 2010, 02:22:20 PM

Quote from: Ted Ewert on September 20, 2010, 01:25:15 PMYou mentioned that the generator had it's highest efficiency at 3k rpm.

I probably was not clear, I wanted to say that this machine is a 3000 rpm DC generator build, but I don't know at what rpm it has the highest efficiency. I guess it is 3000, as it was build for, but I never run it so fast, so I don't know.

Quote from: Ted Ewert on September 20, 2010, 01:25:15 PMYet the overall efficiency went up to 36% into the same load. How would you account for this?

As far as my experience with this and other motors and generators, this kind of changing efficiency with decreased speed is nothing extraordinary. In this particular case I explain that at the higher voltage the motor was supplied too much power for the load. If I increased the load the efficiency would grow. The motor core is more oversaturated at higher voltage.

BTW, the highest overall efficiency of this setup I succeeded to measure was 56%

scianto · September 20, 2010, 02:23:30 PM

Another video showing my first prototype running at different speeds, max 10667 rpm, in relation to the supplied voltage.
http://www.youtube.com/watch?v=fPKfoY-D-rw

scianto · September 22, 2010, 03:30:57 AM

Next test, parallel path magnet motor model SRSM3 is running/turning the shaft of a DC permanent magnet motor working here as a DC generator:
http://www.youtube.com/watch?v=bFzK2z3MV4c