Abnormal operation detection method and device for asynchronous motor

An asynchronous motor and abnormal detection technology, which is applied in the direction of measuring devices, motor generator testing, measuring electricity, etc., can solve problems such as motor speed out of control, motor burning, motor forced stop, etc.

Active Publication Date: 2020-01-07
SUZHOU WEICHUANG ELECTRICAL EQUIP TECH
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Problems solved by technology

When the rotation direction defined by the positive direction of the encoder is opposite to that of the asynchronous motor, the above-mentioned indirect field oriented vector control device is in a state of abnormal control, which is specifically reflected in the fact that the asynchronous motor runs at a lowe

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  • Abnormal operation detection method and device for asynchronous motor
  • Abnormal operation detection method and device for asynchronous motor
  • Abnormal operation detection method and device for asynchronous motor

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Embodiment Construction

[0061] In order to make the purposes, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments It is a part of the embodiments of this application, but not all of them. Based on the embodiments in the present application, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present application.

[0062] figure 1 It is a schematic flow chart of a method for detecting abnormal operation of an asynchronous motor in an embodiment. In an embodiment of the present invention, refer to figure 1 , the application provides a method for detecting abnormal operation of an asynchronous motor, the method comprising:

[0063] Judging whether...

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Abstract

The invention discloses an abnormal operation detection method and device for an asynchronous motor. The method comprises the following steps: acquiring stator currents and stator voltages of the motor; obtaining a reference motor output torque according to the stator currents and the stator voltages; acquiring a detected motor output torque; calculating the difference between the reference motoroutput torque and the detected motor output torque, so that a motor output torque deviation value is obtained; judging whether the motor output torque deviation value is larger than a preset thresholdor not; and when the motor output torque deviation value is equal to or larger than the preset threshold, outputting a motor failure signal. The method has the advantages that low-frequency operationof the motor, during which a forward defined rotation direction of an encoder is opposite to a forward defined rotation direction of the asynchronous motor, can be detected in time, so that within abearable failure operation range of the asynchronous motor, corresponding protection measures for the asynchronous motor can be taken in time to prevent greater failure effects further caused by an uncontrollable motor speed.

Description

technical field [0001] The present application relates to the field of motor technology, and in particular to a method and device for detecting abnormal operation of an asynchronous motor. Background technique [0002] The asynchronous motor current model based on the rotor field orientation is widely used in the asynchronous motor vector control device because the formula is simple and easy to calculate, and the required motor parameters are few. The current feedback frequency of the encoder plus the integral of the motor slip frequency required for control is calculated. This vector control device is called indirect field-oriented vector control. [0003] Whether the speed direction of the encoder feedback is opposite to the rotation direction of the asynchronous motor is determined by the physical relationship between the two when they are installed on the one hand, and is also related to the phase sequence of the output signal on the other hand. When the rotation direct...

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Application Information

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IPC IPC(8): G01R31/34
CPCG01R31/343
Inventor 骆鹏黎国才
Owner SUZHOU WEICHUANG ELECTRICAL EQUIP TECH
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