He is discouraged by the less than anticipated output being produced as a typical induction motor. So, instead of cluttering up his thread, in case he hits on an acceptable solution, I would like to see if anyone here can jump on how to make this motor into a PMDC motor. It will take an inverter to run this and that is expensive and nearly unobtainium for us poor folk with no electronic experience. However, a PMDC is a doable option with readily available controllers with a little modding to them.
These are readily available, and, I have my eye on one for $50.00. I plan on buying it, IF we can come up with a plausible DIY type solution to make these work well. They are water cooled capable, and, I think they might make a great motorcycle motor. I'm off to Florida on the 10th, for 2 weeks, so, I could do some lathe and milling work and mount design up there, and carry it back with me, if a very possible solution can be decided for modding. Building the rotor is where I would like to start this discussion.
Bar magnets, curved magnets, slotted magnets, etc. canting the magnets to avoid cogging necessary ? Canting to increase the efficiency, torque, etc. ?
What do all you guys think ? Is it a viable project ?
A link to a video showing the motor in sections. https://www.youtube.com/watch?v=n2NQ_dO3lMU
Found some more info on this system. It is rated 15KW and 20HP capable with 79 ft/lb of torque. It is 72 Pole Stator and 56 Pole induction rotor. Supposedly it is wound "Y" and the rotor pole segments have 2 bars crossing over the Stator poles as it PULLS the rotor in the magnetic field. This is accomplished by employing a resolver for "timing" of the rotor and stator.
Now, I'm trying to figure out how many magnets would be needed in the rotor. I see the steel rotor has canted bars, so, I'm assuming the magnets should be canted also ?
From my understanding, converting a normal automotive alternator to permanent magnet, an Aluminum rotor body can be used and the magnets need an iron backing to carry the flux. The iron needs to be minimally as thick as the magnets.
My research is looking for information if permanent magnets at the highest rating of "pull" or lifting power (if that's how magnets are rated) say 50 will enable this motor to produce more torque and possibly a small increase in RPM's. I would think 20 HP would be sufficient for a 250cc or less bike conversion, but, torque seems to not be enough, according to the other thread by e-vector.
Found out that the e-assist started in 2008-2009 in the Saturn Vue hybrids. Looks like GM took a normal large case alternator and produced the e-assist from the designs adding the square wire hairpin design and making a rotor with MAGNETS. Thus, converting a later version to Permanent magnet looks very doable.
Now to see if I can find physical dimensions of both alternator motors, and, MAYBE gather magnets from older versions to put into newer version.
If this is in the wrong place, feel free to move it. Thanks, Harold