Re: [CAD_CAM_EDM_DRO] automotive alternator as a Stepper Motor

Doug Fortune wrote:

> I found this interesting note on an Australian website:
> Anyone have an idea how this might work?
>

Badly, very very badly! You would get something like 12 steps
per revolution, the inductance would be hideous, and it would
take a 3-phase drive, rather than 2/4 phase. Also, you'd need to
supply constant current to the rotor field, about 14 V at 2 A
or so. These units might make better 3-phase servo motors
with a somewhat more complex drive system. They would perform
about as well as a similar sized PM brushless servo motor, except
that they were not designed as servo motors, and so torque and velocity
ripple might be pretty high.

If you want a brushless servo drive, I suggest you watch eBay for a
commercial unit designed from the ground up for this use.

Jon