Electric motors have full torque at 0 rpm and a much wider operating RPM range than ICEs (internal combustion engines).  Despite this feature, the efficiency of electric motors still varies at different speeds – they operate at a peak efficiency of around 90-95% but this can fall to 60-70%, particularly at low speed. The question is whether or not it’s worth adding a multi-speed transmission to the EV powertrain to optimize efficiency at all speeds.

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Source : https://quantumworks.com/