How to run a Dual Stator Core Alternator as a Motor Generator

[soundiceuk]

Hi folks,

I fairly recently purchased one of these:

Freedom II Hydro PMG? Permanent Magnet Generator

I had a brainwave this could be used as a motor generator with a mechanical amplifier amplifying the input to give a greater output.


Lets just talk about the design off the shelf.

It has 14 neodymium magnets per stator coil.

It has a stator core per side.

It has 6 output wires.

I hope to pick some of the more advanced electronics guys brains on wiring this up as a motor / generator.


I believe that if the two three phase output wires can be linked together then the output will feed the input.

I then planned to tap off the output into a bridge rectifier.

Would I need three additional diodes to accomplish this?

I want to do this as having an input motor and output alternator will increase friction having two sets of pulleys or sprockets.

Makes sense to do it with motor / generator if possible.

Many thanks,

Paul

[bistander]

alternator/motor

Hi Paul,

To use an alternator as a motor you need to properly excite it meaning supplying the proper voltage and frequency with appropriate timing. Basically running as an ACSM (Alternating Current Synchronous Motor) or BLDC (BrushLess Direct Current) motor. BLDC motors are really AC motors using square or trapezoidal waveforms.

Either way will require an inverter drive (motor controller) with a variable voltage variable frequency output. Although there exists some sensorless controls, plan on installing sensor(s) in the machine; like hall effect, encoder, resolver, etc.

Using alternators as motors can be done. Typically they do not make particularly efficient motors and are difficult to do.

Full wave rectification of three phase requires 6 diodes.

As far as the rest of your plan, I have no comments.

Good luck,

bi