A method for calculating and calibrating that zero angle of a rotor position sensor of a permanent magnet synchronous motor

A permanent magnet synchronous motor and rotor position technology, which is applied in the control of generators, motor generators, electromechanical brakes, etc., can solve problems such as large calibration errors, failure to meet product requirements, and errors in zero-angle calibration results of motor sensors.

Active Publication Date: 2018-12-14
SAIC MOTOR +1
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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...

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  • A method for calculating and calibrating that zero angle of a rotor position sensor of a permanent magnet synchronous motor
  • A method for calculating and calibrating that zero angle of a rotor position sensor of a permanent magnet synchronous motor
  • A method for calculating and calibrating that zero angle of a rotor position sensor of a permanent magnet synchronous motor

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Embodiment Construction

[0071] The present invention provides a specific embodiment. A load, motor, and controller integrated product is known. The structure of the permanent magnet synchronous motor is 6 poles and 9 slots, and the effective value of the rated phase current is 30A. The forward load of the product is 0.71Nm, and the reverse load is 0.78Nm.

[0072] For a permanent magnet synchronous motor with 6 poles and 9 slots, there are 3 electrical angle periods in one rotation of the rotor, that is, there are 3 physical zero angle positions in one rotation of the rotor. Therefore, the current vector sequence output by the controller is shown in Table 2 below.

[0073]

[0074]

[0075] Table 2

[0076] The modulus length of the current vector (Is_x) pointing to the rotor locking angle x° is the rated phase current effective value, that is, 30A. The current vector is slowly output to the motor according to formula (5).

[0077]

[0078] In formula (5), the current change rate k is t...

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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...

Claims

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Application Information

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IPC IPC(8): H02P21/18H02P21/14
CPCH02P21/14H02P21/18
Inventor 肖志锋芦勇罗来军杜春洋罗毅王军曹晨军张善
Owner SAIC MOTOR
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