by drees (Posted Thu, 18 Apr 2013 20:42:03 GMT)
You have it backwards. Most EVs have flat torque from 0 RPM to somewhere around 3000-4000 RPM (peak torque is limited by peak current across the motor windings). Above 3000-4000 RPM torque falls off but power remains at it's peak (typically limited by battery current) until you approach top speed when motor efficiency really starts dropping off.
sproqitman wrote:
It's a synchronous AC motor. The power control unit adjusts the relative angle between the "active" winding and the magnet to achieve maximum torque at ~3000 RPM. The torque curve is then essentially flat from 3000 to max RPM (10,200). You could change the programming in the control unit to have maximum torque at 0 RPM, but my understanding is that Nissan wanted the Leaf to feel more like a "normal" car.
Don't ask me to follow up. That's the limit of my knowledge of AC motors![;-)]( "Wink")
Don't ask me to follow up. That's the limit of my knowledge of AC motors
You have it backwards. Most EVs have flat torque from 0 RPM to somewhere around 3000-4000 RPM (peak torque is limited by peak current across the motor windings). Above 3000-4000 RPM torque falls off but power remains at it's peak (typically limited by battery current) until you approach top speed when motor efficiency really starts dropping off.