关键词: 轮毂电机, 相电流, MOSFET内阻, 控制器

Abstract: Aiming at the problem of phase current fluctuation caused by insufficient sampling time window in single analog-to-digital converter (ADC) current sampling, a phase current reconstruction method was proposed under the internal resistance sampling mode of metal-oxide-semiconductor field-effect transistor (MOSFET). On the basis of analyzing the sampling principle of internal resistance of MOSFET and the minimum time window required for ADC sampling, the sampling restriction conditions were given. The sampling methods were classified according to the minimum sampling time window. When the sampling time was insufficient, the phase current was estimated. When the current was not collected at all, the phase current was reconstructed and replaced. In this algorithm, 32-bit M0 kernel microcontroller unit(MCU)was used as the carrier, and the current before and after reconstruction was compared and analyzed. The effectiveness of the algorithm was obtained, which solved the problem of phase current fluctuation that the phase current couldn’t be collected when the sampling window time was not enough.

Key words: hubmotor, phasecurrent, internalresistanceofMOSFET, controller