Why does an electric vehicle display excessive motor temperature?

[JesseFitz]

Electric vehicles display excessive motor temperature for the following reasons: 1. Excessive power supply voltage: When the power supply voltage is too high, the motor's back electromotive force, magnetic flux, and magnetic flux density all increase. Since the iron loss is proportional to the square of the magnetic flux density, the increased iron loss leads to overheating of the iron core. 2. Insufficient power supply voltage: When the power supply voltage is too low, if the motor's electromagnetic torque remains unchanged, the magnetic flux will decrease, the rotor current will increase accordingly, and the load current component in the stator current will also increase, resulting in higher copper losses in the windings and causing overheating of the stator and rotor windings.