EV motor performance

Many drivers are accustomed to keeping revs low in their petrol vehicles in order to maximise
efficiency, since petrol engines are very inefficient at high revs. Electric drive systems are the
other way around! The single most effective way to maximise performance from your motor and
controller is to keep your motor revs high – around 3000-4000rpm with most Series DC motors.

For a given power output, driving a motor at higher speed uses more voltage but less current,
which reduces copper losses in the motor and resistive heating in the controller. Dropping down
a gear reduces motor amps by about 30%, which can actually halve the heat generated in your
controller – and hence double the continuous power capability. (Caution: Most Series DC motors
are rated to 5000rpm max so be careful not to exceed this speed.)

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