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Re: (ET) E15 alltrax death



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/

From the Divided by a Common Language File (Edited to protect the guilty)
ME - "I'd like to get Price and delivery for connector Part # XXXXX"
Dist./Rep - "$X.XX Lead time 37 days"
ME - "Anything we can do about lead time?  37 days seems a bit high."
Dist./Rep - "that is the lead time given because our stock is live.... we currently have stock."