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Speed sensor-free high-voltage synchronous motor vector control method

A speed sensorless, synchronous motor technology, applied in vector control systems, motor generator control, AC motor control, etc., can solve the problem of being easily affected by the environment, the measurement accuracy of the speed encoder, and the simplicity of the motor speed control system, etc. problem, to achieve the effect of simplifying the control system

Active Publication Date: 2015-08-19
GUODIAN NANJING AUTOMATION
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  • Summary
  • Abstract
  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

However, the speed sensor has seriously affected the simplicity, cheapness and reliability of the motor speed control system in terms of installation, maintenance, and susceptibility to environmental influences.
Especially in the complex application environment of high-voltage frequency converter, the measurement accuracy of the speed encoder is greatly affected by the environment.

Method used

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  • Speed sensor-free high-voltage synchronous motor vector control method
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  • Speed sensor-free high-voltage synchronous motor vector control method

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Embodiment Construction

[0028] The invention is a vector control method of a high-voltage synchronous motor without a speed sensor. figure 1 As can be seen from the structure diagram of the high-voltage synchronous motor vector control system without speed sensor shown, the specific implementation steps of the present invention are as follows:

[0029] 1) Real-time sampling to obtain the stator voltage u of the synchronous motor A , u B , u C and stator current i A i B i C ;

[0030] 2) Obtain the rotor angular velocity ω and rotor position electrical angle θ of the synchronous motor through a phase-locked loop;

[0031] The stator voltage u obtained in step 1) is transformed by Clark transform A , u B , u C and stator current i A i B i C Transform to the two-phase stationary coordinate system to obtain the stator voltage u on the two-phase stationary coordinate system α , u β and stator current i α i β ,Right now

[0032] u ...

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Abstract

The invention discloses a speed sensor-free high-voltage synchronous motor vector control method. The method is characterized by comprising the following steps of timely sampling stator voltage and stator current; obtaining the position and speed of a rotor through a phase-lock loop; obtaining three-phase sine voltage signals through speed and current double closed-loop control; and sending the three-phase sine voltage signals to a phase shifting SPWM distribution plate, controlling a cascaded power unit using a phase shifting SPWM control method, and controlling a motor rotation speed. With the method provided by the invention, no speed sensor is required on a motor shaft, and defects caused by installation of a speed encoder are prevented.

Description

technical field [0001] The invention relates to a vector control method of a high-voltage synchronous motor without a speed sensor, and belongs to the technical field of power electronic automatic control. Background technique [0002] Cascade high-voltage frequency conversion speed regulation is a speed regulation technology that has been widely used in recent years. Through the high-voltage frequency conversion speed regulation system, the problems of starting and speed regulation of most motors are solved, the energy saving effect is remarkable, and it has a broad development space. [0003] In industries such as cement, metallurgy, and chemical industry, especially mines, synchronous motors are widely used. Most of the frequency conversion speed regulation of synchronous motors adopts vector control. In order to determine the direction of the stator current vector and establish a speed closed-loop feedback, the speed signal must be obtained, and the speed sensor of the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02P21/14H02P27/04H02P25/02
Inventor 胡贤新杨奇余志飞胡炫刘春松李冰钱诗宝
Owner GUODIAN NANJING AUTOMATION
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