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Motor phase current sampling method and device

A phase current and sampling point technology, applied in the field of motor phase current sampling, can solve the problems of high cost and poor control effect, and achieve the effects of reducing harmonics, improving control effect, and facilitating application and promotion

Active Publication Date: 2020-06-19
ZHEJIANG DUNAN ARTIFICIAL ENVIRONMENT
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The embodiment of the present invention provides a method and device for sampling the phase current of a motor, so as to at least solve the technical problems of high cost and poor control effect of single-resistance current sampling in the prior art

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  • Motor phase current sampling method and device

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Embodiment 1

[0033] According to an embodiment of the present invention, an embodiment of a sampling method of a motor phase current is provided. It should be noted that the steps shown in the flow chart of the accompanying drawings can be executed in a computer system such as a set of computer-executable instructions, Also, although a logical order is shown in the flowcharts, in some cases the steps shown or described may be performed in an order different from that shown or described herein.

[0034] figure 1 It is a flowchart of a sampling method of a motor phase current according to an embodiment of the present invention, such as figure 1 As shown, the method includes the following steps:

[0035] Step S102, determining a target boundary area, wherein the target boundary area is a boundary area in an invalid area where phase current cannot be reconstructed;

[0036] Step S104, obtaining the target response curve of the DC bus current in the target boundary area and the target samplin...

Embodiment 2

[0106] According to an embodiment of the present invention, a device embodiment for implementing the above-mentioned sampling method of motor phase current is also provided, Figure 6 is a schematic structural diagram of a sampling device for a motor phase current according to an embodiment of the present invention, as Figure 6 As shown, the sampling device of the above-mentioned motor phase current includes: a determination module 70, an acquisition module 72 and a determination module 74, wherein:

[0107] The determination module 70 is used to determine the target boundary area, wherein the above-mentioned target boundary area is a boundary area in the invalid area where the phase current cannot be reconstructed; the acquisition module 72 is used to obtain the target response of the DC bus current in the above-mentioned target boundary area Curve, and the target sampling point of the above-mentioned DC bus current, wherein, the above-mentioned target response curve is the ...

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Abstract

The invention discloses a motor phase current sampling method and device. The method comprises the steps of determining a target boundary region, wherein the target boundary region is a boundary region in an invalid region where phase current cannot be reconstructed; obtaining a target response curve of the DC bus current in the target boundary area and a target sampling point of the DC bus current, the target response curve being a pre-predicted response curve of the DC bus current when a motor sends a control signal; and determining whether to perform translation processing on the target sampling point according to the target response curve and the target sampling point. According to the invention, the technical problems of high cost and poor control effect of single-resistor current sampling in the prior art are solved.

Description

technical field [0001] The invention relates to the technical field of motor control, in particular to a sampling method and device for motor phase current. Background technique [0002] At present, in view of the technical problem that the single-resistor current sampling technology OneShunt cannot effectively reconstruct the phase current in the invalid area, the more common method in this field is to use the asymmetric PWM method. The asymmetric PWM method refers to the use of asymmetric PWM modulation in the invalid area, and through space vector decomposition and compensation, the increased action time is less than the minimum space vector action time T min The non-zero basic space vector of , to the minimum action time, in order to realize the effective sampling of the current. [0003] Although the above method can effectively realize the current reconstruction in the invalid area, it can better solve the application problem of OneShunt on the motor. But there are a...

Claims

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Application Information

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IPC IPC(8): G01R19/25
CPCG01R19/25
Inventor 叶林华
Owner ZHEJIANG DUNAN ARTIFICIAL ENVIRONMENT
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