Asynchronous motor vector control rotor winding temperature on-line monitoring method

A rotor winding and vector control technology, applied in motor control, vector control system, motor generator control and other directions, can solve the negative effects of stability, reliability, rapidity and accuracy, mature application in the field of motor rotor temperature measurement, The hidden dangers of safe and stable operation of the motor are solved, and the control strategy is simple, the control strategy is efficient, and the adverse effects are solved.

Active Publication Date: 2020-04-21
SHANGHAI UNIVERSITY OF ELECTRIC POWER
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The obvious disadvantage of this type of method is that it greatly increases the complexity of the control system, and may even have serious negative effects on the stability, reliability, speed and accuracy of the control system
[0004] 2. Various flux observation techniques, such as full-order state observers, sliding mode observers, Kalman filters, model reference observers, etc., still have various problems. In the research and experiment stage, there is still a long way to go for the accurate observation of the magnetic flux of the AC motor
Since the rotor is rotating at a high speed when the motor is running, it is very difficult to implement the ...

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  • Asynchronous motor vector control rotor winding temperature on-line monitoring method
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  • Asynchronous motor vector control rotor winding temperature on-line monitoring method

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Embodiment

[0038] The present invention relates to an online monitoring method for the rotor winding temperature of an asynchronous motor vector control. This embodiment uses a current tracking PWM inverter as an example to illustrate the present invention, as follows figure 1 shown. The method of the invention can also be applied to the vector control system of asynchronous motor with frequency conversion and speed regulation adopting voltage source type SVPWM inverter.

[0039] The working principle of the inventive method is:

[0040] By speed command n * , the q-axis current given command under the synchronous rotating coordinates is obtained through the closed-loop adjustment control of the speed After the load angle is corrected by the rotor field orientation module, the d-axis current command under the synchronous rotation coordinates is obtained The two command currents are transformed by rotating coordinates, current tracking PWM and inverter to control the motor to run wit...

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Abstract

The invention relates to an asynchronous motor vector control rotor winding temperature on-line monitoring method comprising the following steps: 1) carrying out rotor magnetic field accurate orientation based on load angle compensation correction according to current and voltage signals under d-q synchronous rotation coordinates; 2) estimating a rotor time constant on the basis of accurate orientation of a rotor magnetic field and correction and compensation of slip frequency; 3) estimating the rotor time constant value in a short time when the motor is started for the first time to reach stable rotating speed, and obtaining a motor cooling medium detection temperature; 4) estimating the current rotor time constant value in the normal working process of the motor, obtaining the motor cooling medium detection temperature corresponding to the moment, and estimating the rotor winding temperature in real time; and 5) obtaining the temperature rise of the rotor winding. Compared with the methods in the prior art, the method has the advantages that the rotor magnetic field orientation is accurate, the robustness is good, the temperature monitoring of the rotor winding is conveniently realized, and the method is not influenced by the characteristics of hardware equipment, the electromagnetic interference of a working environment and the like.

Description

technical field [0001] The invention relates to the technical field of asynchronous motor monitoring, in particular to an online monitoring method for rotor winding temperature under vector control of asynchronous motors. Background technique [0002] Rotor field-oriented vector control of asynchronous motors with frequency conversion and speed regulation can transform the inherent nonlinear mechanical characteristics of asynchronous motors into linear mechanical characteristics similar to those of DC motors, and the current and flux linkages are completely decoupled, enabling the speed control of DC motors Basic conditions for good performance. Therefore, rotor field orientation is the most worthy of in-depth research and perfect control technology in the vector control of asynchronous motors. However, during the decades of development of the rotor field oriented vector control technology, due to the influence of the motor rotor resistance Rr and the time constant Tr great...

Claims

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Application Information

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IPC IPC(8): H02P21/16
CPCH02P21/16H02P29/64H02P23/14H02P2207/01
Inventor 梅柏杉刘涛李晓华孙改平
Owner SHANGHAI UNIVERSITY OF ELECTRIC POWER
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