Re: (ET) Elec-trak snow thrower performance

[Rob Brockway <getractor yahoo com>]

Yep.  I think Bill told me there were three motors.  Early one was a series with speed limiting winding.  Without the speed limit, the motor would try to go 9000 rpms, very unsafe.  The series winding gave it great starting torque.  The motor with special windings behaved like an IC motor.  Later models were shunt wound with a spring on the tensioner?  One thought is that it provided some motor rotation at start up, so the shunt wound could work with its reduced starting torque.  I tested the motor with and without the speed limit winding.  The shunt winding alone consumed significant amps (6.5 amps ?).

Rob

Christopher Zach <czach computer org> wrote:

> Rob Brockway wrote:
> > I had an early snow blower with series windings and speed limiting 
> > shunt. Later models may have
>  been more efficient. My unit pulled 40-50 
> > amps just spinning.
>
> Hm. Was there a different type of motor? My blower and the tiller both 
> appear to have series wound motors. Where is the shunt located, and it 
> it really needed?
>
> Chris

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