Method and system for estimating differential inductances in an electric machine

• Main Authors: Luca PERETTI, Tobias ROGG
• Format: Patent
• Language: Chinese; English
• Published: 17.08.2016
• Subjects: CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORSOR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER; ELECTRICITY; GENERATION

A self-commissioning method and system for estimating differential inductances in an electric machine, such as e.g. a synchronous reluctance machine or interior permanent magnet machine, with cross-magnetization effects are provided. The electric machine is driven (31) with PWM voltages to explore current plurality of operating points of the currents in the electric machine while keeping the electric machine at standstill or quasi-standstill. At each operating point PWM switching voltage transients are used (32) as a small-signal excitation. Currents of the electric machine are measured (33) by means of oversampling, which permit the reconstruction of the waveforms including the current ripple within a PWM period caused by the PWM switching transients. Finally, the differential inductances at each operating point are determined (35) based on the determined direct and quadrature current waveforms and voltages. 提供了用于估计电机中的差分电感的方法和系统。种用于估计电机中的差分电感的自调试方法和系统，电机诸如例如同步磁阻电机或内置永磁机，其中提供了正交磁化效应。电机通过PWM电压来驱动(31)，以在使电机保持处