I am surprised this questions did not get more answers. I am not an authority, but have been observing these motors for 20 years. We really can't talk about the Voltage across the motor without talking about RPM and Amperage. If you tried to put 170V across the Motor with less than 500 RPM, the amperage is going to go to the moon. ( 1000s of Amps).
So, the question needs a little more information. As the RPM goes up, the resistance of the motor goes up ( the back EMF). We also need to keep in mind that the Maximum RPM of these motors is below 7000. Even 72V will make one of these motors fly apart if there is no load on it. One thing many new comers do not understand about Series Motors is the fact that the Controller is converting battery Voltage into Motor Amperage. So a 300V battery pack is no problem as long as you have a PWM Controller. If you are trying to get the absolute maximum power out of one of these motors the N.E.D.R.A forum might help. But if you are just worried about your battery pack voltage being too high for your motor maybe you need to re state your question and give more information on what batteries you have, what controller...etc. Back .. "in the days"... when 120V was the Maximum Voltage the Controllers could handle ... I noticed that in many cars, in second gear, with a controller at full throttle, ( so motor voltage and battery Voltage were both 120V) the Amperage would be about 100 Amps. I don't know what the RPM was, but I imagine it was close to the max. When the 156V Controllers came out, it was no longer possible to cruise with a Controller in this " Full ON" state (motor voltage the same as battery voltage). So, the 36V higher battery voltage would push quite a bit more amperage through the motor. -- Steve Clunn Merging the best of the past with the best of the future. www.Greenshedconversions.com _______________________________________________ UNSUBSCRIBE: http://www.evdl.org/help/index.html#usub http://lists.evdl.org/listinfo.cgi/ev-evdl.org For EV drag racing discussion, please use NEDRA (http://groups.yahoo.com/group/NEDRA)
