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Permanent magnet synchronous motor rotating speed extraction method based on carrier frequency component method

A permanent magnet synchronous motor, carrier frequency technology, applied in the direction of a single motor speed/torque control, control generator, motor generator control, etc., can solve the problems of poor real-time performance, unable to track the speed signal, etc. Good real-time and dynamic performance, and the effect of reducing noise and current consumption

Active Publication Date: 2021-07-16
SOUTH CHINA UNIV OF TECH
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Problems solved by technology

The speed estimation based on the vibration signal needs spectrum analysis, which cannot track the fast changing speed signal, and the real-time performance is poor

Method used

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  • Permanent magnet synchronous motor rotating speed extraction method based on carrier frequency component method
  • Permanent magnet synchronous motor rotating speed extraction method based on carrier frequency component method
  • Permanent magnet synchronous motor rotating speed extraction method based on carrier frequency component method

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Embodiment Construction

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

[0062] see figure 1 , the present invention provides a method for extracting the rotational speed of a permanent magnet synchronous motor based on a carrier frequency component method, comprising the following steps:

[0063] Step S1: Based on the double Fourier transform, obtain the voltage expression of the αβ static coordinate system unde...

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Abstract

The invention discloses a permanent magnet synchronous motor rotating speed extraction method based on a carrier frequency component method. The method comprises the steps of: S1, obtaining a voltage expression of an alpha-beta static coordinate system under an SVPWMregular asymmetric sampling strategy based on dual Fourier transform; S2, by means of the voltage expression, constructing a demodulation signal expression related to a rotor position, and simplifying the demodulation process through a low-pass filter during demodulation; S3, collecting the three-phase current of the output end of the inverter of a permanent magnet synchronous motor, and carrying out the step S2 to obtain a corresponding current demodulation signal; and S4, performing PI feedback control on the obtained current demodulation signal, so as to extract rotating speed information. According to the method, a current sensor is simply installed, rotating speed information can be obtained while current signals are obtained; and voltage signals do not need to be additionally injected, a band-pass filter does not need to be used either, and therefore the calculated amount can be reduced, and noise and current loss can be reduced; meanwhile, due to the fact that the method is a time domain method, the real-time performance of the method is better than that of an order tracking method.

Description

technical field [0001] The invention belongs to the field of permanent magnet synchronous motors and signal processing, in particular to a method for extracting the rotational speed of permanent magnet synchronous motors based on a carrier frequency component method. Background technique [0002] Speed ​​is not only one of the indicators of motor operation and control performance, but also a parameter required in the order analysis of motor vibration signals. Therefore, the accurate estimation of the rotational speed under different working conditions has important engineering application value and significance. [0003] At present, there are mainly two methods for speed estimation: with speed sensor and without speed sensor. The method based on the speed sensor needs to install a mechanical sensor such as a photoelectric encoder on the rotor shaft, which has certain requirements for the axial size, coaxiality and encoder parameters, which increases the difficulty and compl...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02P21/18H02P6/06
CPCH02P21/18H02P6/06
Inventor 张炜杨志坚张雨国
Owner SOUTH CHINA UNIV OF TECH
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