Re: (ET) E15 alltrax death

[Robert Adsett <subscriptions aeolusdevelopment com>]

At 07:42 AM 12/4/2007 -0500, Konstanty, Walter (GE Indust, ConsInd) wrote:
>   The PTO shouldn't be connected with the Alltrax....it's a separate 
> circuit.  The PTO is just a contactor with switch/coil-relay to provide 
> direct battery power to the outlet.  The motor can't generate a spike as 
> it's a resistive element.

Sure it has a resistive component.  But it is primarily an inductor.  A 
motor is a magnetic device so inductance is part of the territory.  Now 
some motors are more inductive than others and the stator is more inductive 
than the rotor so PM motors tend to be less inductive than series wound 
motors.  In fact it becomes a real issue with low inductance PM motors such 
as the E-Tek, ripple current becomes a concern.  With conventional motors 
though even a relatively slow 5kHz switch speed produces relatively little 
ripple.  At 10-20kHz ripple is essentially zero.

Robert

http://www.aeolusdevelopment.com/

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