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Motor state determining method and device

A state judgment and state technology, which is applied in the field of motor state judgment methods and devices, can solve the problems of not allowing the installation of speed encoders, inverter hardware and installation equipment, and increase maintenance costs, so as to avoid unnecessary damage and reduce requirements. , cost saving effect

Inactive Publication Date: 2015-09-09
LS INDAL SYST WUXI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It is known that the most common way to obtain the speed information of the motor rotor by the frequency converter is to install a speed encoder on the motor shaft. However, this will lead to an increase in the hardware and installation of the frequency converter, as well as the cost of equipment and maintenance. Moreover, in the field There are also cases where restrictions do not allow the installation of a speed encoder

Method used

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  • Motor state determining method and device
  • Motor state determining method and device

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Embodiment Construction

[0029] Hereinafter, embodiments of the present invention will be described with reference to the drawings.

[0030] figure 1 It is a waveform diagram showing the stator current (output current of the inverter) of the motor in different operating states.

[0031] Usually, depending on the operating state of the motor, the output current of the inverter, that is, the waveform of the stator current of the motor is also different. like figure 1 As shown, when the motor is locked, the output current of the inverter, that is, the stator current of the motor, is the same as the command value of the current sent to the inverter by the control circuit of the inverter (for example, figure 1In this case, although the value of the output current is much larger than the current value when the motor is running normally, the waveform of the output current of the inverter is still sinusoidal. On the other hand, when the motor is overexcited, the output current of the inverter, that is, the...

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Abstract

The invention provides a motor state determining method. When a frequency converter is used for driving a motor, the motor state determining method comprises: sampling the frequency and a current value of the output current of the frequency converter; drawing an approximate sinusoidal changing curve of the output current according to the sampled frequency and the current value of the output current; and when an abnormality (overcurrent) occurs to the output current of the frequency converter, determining the running state of the motor by determining whether the actually-measured current value of the output current is on the drawn approximate sinusoidal changing curve, and if yes, determining that the motor is in a stalling state, or if not, determining that the motor is in an overexcitation state.

Description

technical field [0001] The invention relates to a method and a device for judging a state of a motor, in particular to a method and a device for judging the state of a motor by sampling and analyzing the output current of a frequency converter to judge the running state of the motor. Background technique [0002] Usually, when a frequency converter is used to drive an asynchronous motor (hereinafter referred to as a motor), sometimes the motor cannot operate normally due to the relationship between the motor speed and the electromagnetic torque, that is, the mechanical characteristics of the motor, and the inertia of the system's equipment. running. At this time, it is necessary to adjust the parameters of the inverter to meet the requirements of the industrial site, to make up for some potential problems, and to achieve the best matching state between the motor control system and the mechanical system. [0003] When using a frequency converter to drive a new type of motor,...

Claims

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Application Information

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IPC IPC(8): G01R31/34G01R19/165G01R23/02H02P27/04
Inventor 李哲
Owner LS INDAL SYST WUXI
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