by cliff (Posted Thu, 06 Jun 2013 10:57:40 GMT)
My speculation is that when the motor was redesigned the number of poles was reduced from
48 to 42, reducing the fundamental frequency from "8 x rpm" to "7 x rpm" and thus changing
the drop off of torque from about 28 mph to 32 mph, but also reducing the torque. This may
also effect the top speed if it was electrically limited rather than mechanical.
Drivesolo wrote:
Maybe it extends the available peak torque out further over the RPM range of the motor?
My speculation is that when the motor was redesigned the number of poles was reduced from
48 to 42, reducing the fundamental frequency from "8 x rpm" to "7 x rpm" and thus changing
the drop off of torque from about 28 mph to 32 mph, but also reducing the torque. This may
also effect the top speed if it was electrically limited rather than mechanical.