Three-phase current sampling crosstalk correction system and method for single motor

By adding a crosstalk compensation matrix into the microcontroller, the crosstalk problem in the three-phase current sampling of a single motor is corrected, the current sampling accuracy and torque control accuracy are improved, and the computational complexity and cost are reduced.

CN120601803AInactive Publication Date: 2025-09-05LEADRIVE TECH (SHANGHAI) CO LTD
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Patent Information

Application Number
CN202511080353.1
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2025-08-04
Publication Date
2025-09-05
Estimated Expiration
Not applicable · inactive patent

AI Technical Summary

Technical Problem

In the three-phase inverter bridge circuit of a single motor, due to the physical properties of the material of the three-phase inverter bridge circuit, the output currents of each phase have crosstalk, which affects the acquisition accuracy of the current sensor and leads to misjudgment.

Method used

A crosstalk compensation matrix is ​​added to the microcontroller. By constructing the product of the phase current matrix and the crosstalk compensation matrix, the real current matrix is ​​calculated, the current sampling of the coreless current sensor is corrected, and the sampling accuracy is improved.

Benefits of technology

The current sampling accuracy of the coreless current sensor is improved, the accuracy of torque control is improved, the computing power requirements are reduced, and the cost is reduced.

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Abstract

The invention provides a three-phase current sampling crosstalk correction system and method of a single motor, the three-phase current sampling crosstalk correction system comprises a motor three-phase circuit and a single-chip microcomputer, the first phase of the motor three-phase circuit outputs a first phase current Iua to the single-chip microcomputer; the second phase outputs a second phase current Iva to the single-chip microcomputer; the third phase outputs a third phase current Iwa to the single-chip microcomputer; a compensation module is arranged in the single-chip microcomputer, a crosstalk compensation matrix is preset in the compensation module, the first phase current Iua, the second phase current Iva and the third phase current Iwa are constructed into a phase current matrix, the product of the phase current matrix and the crosstalk compensation matrix is calculated, and a real current matrix is obtained; and extracting a first real phase current Iub, a second real phase current Ivb and a third real phase current Iwb in the real current matrix and outputting the first real phase current Iub, the second real phase current Ivb and the third real phase current Iwb. After the technical scheme is adopted, the crosstalk compensation matrix is added into the algorithm, so that the interference of the two-phase sinusoidal current of the magnetic-core-free current sensor in the single motor on the sampling of the other-phase current can be corrected.
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