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Motor single-phase grounding short circuit detection method and system and storage medium

A detection method and relatively ground-based technology, which can be used in short-circuit testing, motor generator testing, and electrical measurement. It can solve the problems of high cost pressure, false alarms, and missed alarms of motor controllers, and achieve easy collection and detection, and improved detection. effect, error-prone effect

Active Publication Date: 2020-12-15
SUZHOU INOSA UNITED POWER SYST CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Although the three-phase current unbalance method is simple, it relies heavily on the accuracy of the current sampling link and the current battery voltage margin. The three-phase current, that is, under low carrier frequency and low bus voltage, it is easy to fail to collect the short-circuit current and cause false alarms or missed alarms. Therefore, this method adds great difficulty to the fault threshold setting.
[0007] However, the Y-capacitor voltage sampling method generally requires an additional Y-capacitor voltage sampling circuit and requires re-layout, which brings great cost pressure to the motor controller.

Method used

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  • Motor single-phase grounding short circuit detection method and system and storage medium

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Embodiment 1

[0036] An embodiment of the present application provides a method for detecting a single phase-to-ground short circuit of a motor, including:

[0037] S10, acquiring characteristic parameters of the motor and the motor controller;

[0038] Wherein, the motor controller refers to the controller used in the electric vehicle to work for the motor driving the electric vehicle. The motor controller includes an inverter. The inverter is used to receive the DC power delivered by the battery of the electric vehicle, and convert it into a three-phase AC to provide power for the motor of the vehicle. The characteristic parameters are physical parameters displayed corresponding to the working conditions of the current motor and electric controller, and the characteristic parameters generally include multiple.

[0039] S20. Calculate a fault threshold according to the characteristic parameters;

[0040] The fault threshold is a parameter threshold obtained through the characteristic pa...

Embodiment 2

[0071] The present application also proposes a detection system for single-phase-to-ground short-circuit of a motor, which is used to judge whether a single-phase-to-ground short circuit occurs in a motor of an electric vehicle. The system includes a processor (not shown), a memory (not shown) and a A system control program on the memory and operable on the processor, when the system control program is executed by the processor, implements the steps of the method for detecting a single-phase-to-ground short circuit of a motor as described above.

[0072] It should be understood that, in some embodiments, the processor may be a central processing unit (CPU), and the processor may also be other general-purpose processors, digital signal processors (DSP), application-specific integrated circuits (ASICs), off-the-shelf programmable Gate array (FPGA) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. A general-purpose ...

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Abstract

The invention discloses a motor single-phase grounding short circuit detection method and system and a storage medium. The motor single-phase grounding short circuit detection method comprises the steps of acquiring characteristic parameters of a motor and a motor controller; calculating a fault threshold value according to the characteristic parameters; controlling a switching device in the motorcontroller to be switched on or off according to a preset rule, and detecting a test current during an action period of the switching device; and judging whether the motor of the electric vehicle isin single-phase grounding short circuit or not according to the fault threshold value and the test current. The invention aims to reduce the detection cost of the single-phase grounding short circuitof the motor of the electric vehicle and improve the detection effect of the single-phase grounding short circuit of the motor of the electric vehicle.

Description

technical field [0001] The present invention relates to the field of electric vehicles, in particular to a detection method, system and storage medium for single-phase-to-ground short circuit of a motor. Background technique [0002] An electric vehicle refers to a vehicle that is powered by a vehicle-mounted power supply, drives wheels with a motor, and meets the requirements of road traffic and safety regulations. Due to its smaller impact on the environment than traditional vehicles, electric vehicles have good application prospects. [0003] In the electric vehicle industry, there are two main insulation detection methods for on-board motors: insulation tester and electronic control self-inspection. OEMs generally use insulation detectors and other equipment to conduct vehicle-level inspections, but generally OEMs also require motor controllers to be able to self-identify whether a single phase-to-ground short circuit occurs. [0004] As for the existing self-inspectio...

Claims

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Application Information

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IPC IPC(8): G01R31/52G01R31/34G01R31/00G01R27/08
CPCG01R31/52G01R31/343G01R31/007G01R27/08
Inventor 刘兴亚王龙李环平袁建飞
Owner SUZHOU INOSA UNITED POWER SYST CO LTD
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