SYSTEM AND METHOD FOR REDUCING SPEED RIPPLE OF DRIVE MOTOR OF ELECTRIC VEHICLE

摘要

A system and method for reducing drive motor speed ripple of an electric vehicle are provided. The system includes an inverter that converts DC power supplied from a battery to AC power and supplies the AC power to the drive motor by inverter switching. A resolver is configured to detect a speed of the drive motor and a position of a rotor, a signal generator includes a microcontroller that is configured to generate a square wave signal. An integrator is configured to convert the square wave to a sine wave, and apply a sine-wave excitation input signal to the resolver. Furthermore, a motor controller is configured to adjust the frequency of the excitation input signal to prevent the inverter switching frequency of the inverter and the peaks of an output voltage signal sampled for speed calculation from overlapping.

主权项

1. A system for reducing drive motor speed ripple of an electric vehicle, comprising:
an inverter configured to convert direct current power supplied from a battery to alternating current power and configured to supply the alternating current power to the drive motor by inverter switching; a resolver configured to detect a speed of the drive motor and a position of a rotor; a signal generator including a microcontroller configured to generate a square wave signal and an integrator configured to convert the square wave to a sine wave, and configured to apply a sine-wave excitation input signal to the resolver; and a motor controller configured to adjust the frequency of the excitation input signal to prevent the inverter switching frequency of the inverter and the peaks of an output voltage signal sampled for speed calculation from overlapping.