Permanent magnet synchronous motor rotor zero detection method

• Main Authors: SHI YIBING, LI ZETONG, LI YANJUN, NI XINGYU, TIAN YANG, ZHANG WEI, XIANG ZEMING
• Format: Patent
• Language: Chinese; English
• Published: 16.04.2021
• 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

The invention discloses a permanent magnet synchronous motor rotor zero position detection method, which comprises the steps of in a stator dq coordinate system, setting a stator direct-axis voltage vector as an appropriate value Ud, setting a quadrature-axis voltage vector Uq and a synthetic vector angle of an SVPWM module as zero, obtaining the position of a rotor relative to the nearest A phase, and setting the rotation direction of a synthetic stator magnetic field according to the position; and keeping Ud and Uq unchanged, controlling the rotor to rotate by controlling the increase or decrease of the synthetic vector angle of the SVPWM module, and finally calculating the zero value of the rotor according to the electrical angle obtained by the positive and negative rotation of the rotor. 本发明公开了一种永磁同步电机转子零位检测方法，首先在定子dq坐标系中，将定子直轴电压矢量设定为一合适的值Ud，将交轴电压矢量Uq和SVPWM模块的合成矢量角为零，从而获取转子相对于最近A相的位置，再由该位置设定合成定子磁场的旋转方向；保持Ud和Uq不变，通过控制SVPWM模块的合成矢量角的增加或者减小，进而控制转子旋转，最后根据转子正反转得到的电角度计算出转子的零位值。