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Motor rotation speed measurement method based on root mean square demodulation

A motor speed, root mean square technology, applied in the control of generators, motor generator control, electronic commutation motor control, etc., can solve the problems of difficult to obtain the number of rotor slots of the motor, complex calculation, poor real-time performance, etc.

Active Publication Date: 2015-05-06
ZHUHAI PILOT TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the current stator current harmonic analysis methods are all based on rotor slot harmonic analysis. However, the number of rotor slots of the motor is often difficult to obtain, and the calculation is complicated and the real-time performance is poor.

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  • Motor rotation speed measurement method based on root mean square demodulation
  • Motor rotation speed measurement method based on root mean square demodulation
  • Motor rotation speed measurement method based on root mean square demodulation

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Embodiment Construction

[0017] In order to better understand the technical solutions of the present invention, the embodiments provided by the present invention will be described in detail below in conjunction with the accompanying drawings.

[0018] Refer to attached figure 1 , the motor speed measurement method based on root mean square demodulation of the present invention mainly comprises the following steps:

[0019] Step 1: With a certain sampling frequency F s Collect the three-phase current signal of the motor stator, and the sampling time is 1-2 minutes.

[0020] Step 2: Perform fast Fourier transform on the collected three-phase current signal, and obtain the power frequency F on the frequency spectrum l .

[0021] Step 3: Perform root-mean-square demodulation on the collected three-phase current signals to obtain a demodulation spectrum.

[0022] Calculate the power frequency cycle time window width N=ceil(F s / F l )(ceil(F s / F l ) function is to take greater than F s / F l The m...

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Abstract

The invention provides a motor rotation speed measurement method based on root mean square demodulation. By root mean square demodulation of three-phase current, industrial-frequency harmonics and high-frequency signals are filtered out, a rotation speed peak and a pole pass frequency peak are respectively acquired on a three-phase current demodulation frequency spectrum to obtain motor rotation speed values, and an average value of the motor rotation speed values is calculated to serve as a final motor rotation speed measurement result. The method is used for determining rotation speeds of induction motors and is further expected to lower calculation complexity and improve timeliness.

Description

technical field [0001] The invention relates to a method for measuring and calculating the rotating speed of an electric motor, in particular to a method for measuring and calculating the rotating speed of an AC induction motor based on root mean square demodulation analysis. Background technique [0002] AC induction motors are widely used in industrial and national defense military fields, and their safe operation is very important. Aiming at various serious faults that may occur in induction motors, various mature motor relay protection measures have been taken, but they only act after the accident or when the fault develops seriously. In 1987, Tavner P.J. and Penman J. first proposed the concept of motor condition monitoring. In the subsequent development process, motor condition monitoring and fault diagnosis constitute an organic whole, and the two are inseparable. Motor status monitoring and fault diagnosis are based on online monitoring of asynchronous motor relate...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02P21/00
Inventor 张民恕黄沛明方在华
Owner ZHUHAI PILOT TECH