Vector Control Method of Permanent Magnet Synchronous Motor

Abstract

The invention provides a vector control method of a permanent magnet synchronous motor, comprising the following steps: S1, using the mathematical model of the stator voltage of the permanent magnet synchronous motor, to solve the mathematical model of the time derivative of the stator current; S2, discretizing the model, and Angle θ inj Inject high-frequency voltage V at inj , obtain the high-frequency stator current difference model of the permanent magnet synchronous motor; S3, further simplify the high-frequency stator current difference model of the permanent magnet synchronous motor according to the triangular equation transformation, and solve the high-frequency stator current difference model of the permanent magnet synchronous motor The included rotor position; S4, controlling the permanent magnet synchronous motor to perform vector control according to the rotor position.

Description

technical field [0001] The invention relates to the technical field of motor control, in particular to a vector control method of a permanent magnet synchronous motor. Background technique [0002] The performance of vector control of permanent magnet synchronous motor depends largely on the accuracy of rotor position information. For scenes with strict motor control performance requirements such as electric vehicles, high-quality encoders can meet their needs. However, the addition of sensor components such as encoders greatly increases the probability of mechanical and electrical failures, which makes the fault-tolerant mechanism other than position sensors such as encoders—the position sensorless rotor position estimation algorithm extremely important. At present, most position sensorless algorithms are suitable for rotor position estimation under high-speed motor operation. In static / low-speed conditions, high-frequency voltage injection is generally used, but the measu...

AI Technical Summary

Problems solved by technology

At present, most position sensorless algorithms are suitable for rotor position estimation under high-speed motor operation. In static / low-speed conditions, high-frequency voltage injection is generally used, but the measurement errors of stator voltage, stator current, etc., as well as observers and state transitions The parameter adjustment accuracy of modules such as the sensor greatly limits the accuracy of the rotor position estimation of the position sensorless algorithm, which cannot meet the motor control performance requirements of harsh scenarios.

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