markorman wrote:Stop thinking about controlling the motor with watts. Nobody nowhere is controlling the motor with watts. The only time you care about watts consumed by motor is when you have to limit the power drained from battery.
Almost are motors are in torque control mode (at least in automotive world) since the torque is the force the motor produces and force you feel when accelerating/decelerating. In BLDC and PMSM motor you have to limit the torque because the mechanical limits, and limits due to current in copper windings.
This is typical graph for PMSM motors. You have to limit the torque (motor current) and then limit the power.
@markorman... if i was elon musk, i would instruct my engineers to modify my personal tesla S in the following manner...
1. put a motor temp thermometer in the middle of my dashboard with a "red line" slightly below the winding enamel breakdown temp
2. instruct my control algorithm engineers to continue the "peak battery amps" plateau all the way to the left side of the graph to ensure control of constant max battery watt via the electricity pedal leading to increased acceleration:
3. triple the tire width
4. head down to the local drag strip....