Method for acquiring parameters of permanent magnet synchronous motor (PMSM)

Abstract

The invention provides a method for acquiring parameters of a permanent magnet synchronous motor (PMSM), which comprises the following steps: measuring direct-current bus voltage; controlling an inverter to output current to the PMSM by adopting a digital hysteresis loop-type pulse modulation demodulation control mode; detecting line voltage and phase current which correspond to input current in the PMSM; and calculating the stator resistance of the PMSM, the magnetic induction strength psif of a permanent magnet excitation flux linkage and / or the inductance value Ld of the d axis and the inductance value of the q axis according to different current output to the PMSM under controlling the inverter. By adopting the method for acquiring parameters of the PMSM, three parameters in the PMSM are accurately calculated, and the control effect of the vector control technology on the PMSM is effectively improved.

Description

technical field [0001] The invention relates to motor control technology, in particular to a parameter acquisition method of a permanent magnet synchronous motor, which belongs to the field of automatic control. Background technique [0002] With the rapid development of new and high-performance permanent magnet material technology, the advantages of small size, light weight and high efficiency of permanent magnet synchronous motor (Permanent Magnetic Synchronous Motor; PMSM) are becoming more and more prominent, and its application fields are constantly expanding. In the field of high-precision control such as CNC machine tools and robots, permanent magnet synchronous motors are more and more widely used. [0003] At present, in order to meet higher requirements for motor control performance, the industry mostly uses PMSM vector control technology to control the operation of PMSM. This is because: the vector control technology can enable PMSM to obtain good transient respo...

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Problems solved by technology

[0006] However, the above-mentioned prior art for obtaining various parameters has the following defects: because the constant voltage output by the inverter to the PMSM contains a large number of harmonics, the stator current of the PMSM obtained also has rich harmonic components, so obtaining The stator resistance is not accurate; at the same time, because the constant voltage output from the inverter to the PMSM contains a large number of harmonics, it also makes the magnetic field observer detect the inductance values ​​of the d-axis inductance and q-axis inductance and the permanent magnet excitation flux linkage The magnetic induction intensity and other parameters are also inaccurate, which will affect the control effect of vector control technology on PMSM

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