Calculation method and calibration method of zero angle of permanent magnet synchronous motor rotor position sensor

Abstract

A method for calculating zero angle of rotor position sensor of permanent magnet synchronous motor disclosed in the invention includes defining P physical zero angles, forward rotation direction and reverse rotation direction of rotor of permanent magnet synchronous motor in one revolution; Calculating a given current vector of forward rotation and reverse rotation of a rotor at each physical zeroangle position of the motor; The zero angle of each physical zero angle position forward rotor position sensor and the zero angle of the reverse rotor position sensor are obtained by loading the forward and reverse current vectors of the motor. The zero angle of each physical zero angle position forward rotor position sensor and the zero angle of the reverse rotor position sensor are obtained. The forward and reverse loads of the motor are measured, and the zero angle errors of the forward rotor position sensor and the reverse rotor position sensor of each physical zero angle position are eliminated by weighted calculation, so that the zero angle of each physical zero angle rotor position sensor is obtained. The invention also discloses a zero angle calibration method of a rotor positionsensor of a permanent magnet synchronous motor. The invention can avoid the error caused by the load to obtain more accurate zero angle of the rotor position sensor and more accurately calibrate the zero angle of the rotor position sensor.

Description

technical field [0001] The invention relates to the field of automobiles, in particular to a method for calculating the zero angle of a rotor position sensor of a permanent magnet synchronous motor. The invention also relates to a method for calibrating the zero angle of the rotor position sensor of the permanent magnet synchronous motor using the calculation method for the zero angle of the rotor position sensor of the permanent magnet synchronous motor. Background technique [0002] According to the field oriented control (FOC) algorithm, the control parameters (such as: voltage, current, inductance) of the permanent magnet synchronous motor (in the following description, all involved "motor" refers to "permanent magnet synchronous motor") from three-phase static After the UVW coordinate system is converted to the orthogonal dq coordinate system, it will introduce such as figure 1 The motor rotor electrical angle θ is shown. The angle θ is usually obtained by the feedbac...

AI Technical Summary

Problems solved by technology

Combining Figure 2 and formula (1), it can be seen that due to the existence of mechanical loads, the conventional current vector calibration method will introduce large calibration errors, affect the motor control performance, and cannot meet product requirements

[0008] Therefore, to solve the problem of large errors in the zero-angle calibration results of the motor sensor caused by the motor load, and to save product production costs, a zero-angle motor sensor with load is developed. An automatic calculation method and a calibration method are very important and significant for integrated packaged products

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