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Self-checking method and system for alternating-current motor controller

A motor controller, AC motor technology, applied in general control systems, control/regulation systems, testing/monitoring control systems, etc., can solve problems such as insufficient detection of power devices and current transformers

Active Publication Date: 2020-04-03
河南嘉晨智能控制股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, the existing AC motor controller power-on self-test scheme is not sufficient for the detection of power devices and current transformers

Method used

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  • Self-checking method and system for alternating-current motor controller
  • Self-checking method and system for alternating-current motor controller
  • Self-checking method and system for alternating-current motor controller

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Embodiment Construction

[0020] In order to make the technical problems, technical solutions and beneficial effects solved by the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

[0021] The present invention provides a method for self-inspection of an AC motor controller, and the self-inspection control circuit of an AC motor controller corresponding to the method is as follows: image 3 shown. The method includes the following steps:

[0022] Step 1, set the preset reference current I a_ref As a phase reference current, where I a_ref is an AC ramp current with a preset frequency, and the preset frequency is set as the frequency of the winding phase current in the motor when the motor controller to be self-tested actually works. The preset reference AC curre...

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Abstract

The invention discloses a self-checking method and system for an alternating-current motor controller. The method comprises the steps of using a space vector modulation component (SVM) to generate a specific modulation mode to control the on-off of a power tube in an inverter, detecting whether the relationship among a current Ia of a phase a, a current Ib of a phase b and a current Ic of a phasec of a motor in the inverter meets a condition, wherein Ia _ ref is a preset reference current; if the relationship meets the condition, representing that a power loop or a current detection loop of amotor controller is normal, and otherwise, indicating a fault. According to the scheme provided by the invention, the motor controller outputs the current during self-inspection, the current is moresuitable for the actual condition of the motor controller during motor operation, and during the self-inspection process, the motor does not establish a rotating magnetic field and does not provide electromagnetic torque externally.

Description

technical field [0001] The invention provides a power-on self-inspection scheme of an AC motor controller, and relates to the AC motor controller and the function detection of sub-components such as an inverter circuit and an SVM component in the AC motor controller. In particular, the invention relates to a self-checking method and system for an AC motor controller. Background technique [0002] AC motor controllers are widely used in industrial products as a device that converts battery-side DC power into motor-side AC power, and its output power ranges from hundreds of watts to hundreds of kilowatts. Among them, the power device (MOS or IGBT) in the inverter part of the AC motor controller is a vulnerable device in the power chain. Once damaged, the AC motor controller will not work normally, and even cause the entire inverter to be damaged. The inverter was overheated and burned due to short circuit. The failure modes of power devices include short-circuit and open-cir...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G05B23/02
CPCG05B23/0221
Inventor 李飞姚欣
Owner 河南嘉晨智能控制股份有限公司