The article provides an overview of possible methods for controlling the rotational speed of electric motors used in electric vehicles. Overvoltages resulting from commutation in the motor circuit are discussed. An analysis of overvoltages and methods for their reduction associated with the processes of switching on, switching off, and speed regulation of the motor is performed. Solutions used by several manufacturers are presented, and ways to improve existing solutions are discussed.Due to high currents in the circuit, which translate into significant overvoltages across inductances, the issue is important and economically justified. Modern vehicles powered by an electric motor are equipped with a high-current, low-voltage installation that powers the main drive motor. The commutation of high currents results in the formation of dangerous overvoltages in the circuit with inductance. (…)
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Source: Logistyka Magazine