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Sensorless control method for high-speed permanent magnet synchronous motor

A technology of permanent magnet synchronous motor and control method, applied in motor control, motor generator control, electronic commutation motor control and other directions, can solve the problems of affecting the dynamic performance of the system, difficulty in implementation, and inaccuracy, and reduce inverter nonlinear effects of the device, avoid the system bandwidth limitation, and broaden the power spectral density

Active Publication Date: 2021-04-13
NORTH CHINA UNIVERSITY OF TECHNOLOGY
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method is relatively simple and easy to implement, but the motor will rotate or even reverse during the process of obtaining the rotor position, which does not meet the accuracy of the application, and because the method is an open-loop method, the stability is poor, so in high Auxiliary signal injection method is often used in precision control field
The auxiliary signal injection method mostly uses voltage signals, and the common injection voltage forms include rotating voltage signals and high-frequency voltage signals, but these two implementation methods require the use of multiple filters, and filters usually limit the bandwidth of the control system, and It is difficult to realize, which affects the dynamic performance of the system
[0004] At the same time, when the motor is controlled in the zero-speed and low-speed areas, the use of high-frequency signals will bring sharp and harsh noises, which will have a serious impact on operators
And the nonlinear effect of the inverter will affect the estimation accuracy of the rotor position

Method used

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Embodiment 1

[0170] In the present invention, the random square wave signal injection used has a more significant effect on reducing the noise of the permanent magnet synchronous motor than the fixed frequency frequency signal injection, as follows:

[0171] 1) Spectrum diagram of motor current injected by fixed frequency square wave signal

[0172] inject as Figure 12 The fixed frequency square wave signal shown is a square wave signal with a square wave amplitude of 60V, a frequency of 2.5kHz, and a period T of 0.004s.

[0173] According to formula (15), the discrete spectral density can be obtained,

[0174]

[0175] Calculated by the above formula, the motor current spectrum diagram is as follows: Figure 14 As shown in (a), there are obvious peaks in the motor current spectrogram, and their amplitudes are: 7.2dB, -0.1dB, -6.2dB; the peaks of the motor current spectrogram represent noise. The larger the amplitude of the spike, the correspondingly larger the noise.

[0176] 2) S...

Embodiment 2

[0184] In another preferred embodiment of the present invention, due to the nonlinearity of the inverter, the actual high-frequency voltage signal is distorted. Taking the d-axis as an example, the d-axis appears as δu dh voltage error, so that the injected voltage Step-like, resulting in induced current produce non-linear effects such as Figure 15 (a) shown.

[0185] Therefore, based on Figure 6 The principle of the high-frequency injection method for real-time adjustment of the amplitude shown in the figure, K in the figure ph is the proportional coefficient of the PI regulator; K ih is the integral coefficient; Tsamp is the sampling time; z is the discretization operator; the error is eliminated by constructing the regulator, as shown in the following formula (29):

[0186]

[0187] In the formula, Indicates the error between the actual angle and the estimated angle; Δi qh Indicates the change value of the q-axis current; Δi dh Indicates the d-axis current c...

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Abstract

The invention discloses a sensorless control method for a high-speed permanent magnet synchronous motor. The method can improve the dynamic performance of the high-speed permanent magnet synchronous motor in a static or low-speed region while reducing the noise generated by a conventional high-frequency injection method. And stable operation of the motor in dynamic operation processes of sudden loading, load shedding and the like can be ensured.

Description

technical field [0001] The invention belongs to the field of motor control, and in particular relates to a position sensorless control method for a high-speed permanent magnet synchronous motor. Background technique [0002] As the power source of high-speed transmission technology, high-speed AC motors are widely used in aerospace, flywheel energy storage, high-precision CNC machine tools, and distributed energy. Permanent magnet synchronous motors have the advantages of high efficiency and high power density, and are widely used in high-speed systems. However, since the rated frequency of the high-speed motor is generally above 500 Hz, and the inverter is limited by the heat dissipation capability of the device, the switching frequency cannot be too high. The high-speed motor control method needs to satisfy the operating condition that the ratio between the switching frequency of the inverter and the fundamental frequency of the motor is low, that is, the operating condit...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02P6/18H02P21/18
CPCH02P6/183H02P21/18H02P2203/11Y02E60/16
Inventor 苑国锋张宝利
Owner NORTH CHINA UNIVERSITY OF TECHNOLOGY
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