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Method for starting motor without sensor

A motor starting and sensor technology, which is applied in the direction of controlling generators, motor generators, and electromechanical transmissions, etc., can solve problems such as poor versatility, failure to start, and inability to operate the motor, so as to improve the success rate of switching and achieve universal The effect of strong resistance and no sudden change of current

Active Publication Date: 2011-03-09
东元总合科技(杭州)有限公司
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Problems solved by technology

In this way, a new problem arises. When the current reference quantity Id and Iq are adjusted, when the load is too large, it may cause the motor to fail to run, which directly causes the failure to start.
This method needs to be adjusted repeatedly according to the load characteristics of the model at startup, and the versatility is poor.

Method used

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  • Method for starting motor without sensor

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Embodiment Construction

[0022] In order to make the technical means, creative features, goals and effects achieved by the present invention easy to understand, the present invention will be further described below in conjunction with specific illustrations.

[0023] The gist of the present invention is to solve the problem of sensorless control of permanent magnet motors in the prior art. When the permanent magnet motor is started, the speed open-loop control is switched to the speed closed-loop control. There is an angle difference in the estimated position value. When the estimated value of the rotor position is directly used for speed closed-loop control, the control variable will jump and change continuously and smoothly. A sensorless motor starting method is provided to avoid motor control effects. Abrupt mutation, strong current oscillation, strong vibration of the motor, etc., to ensure the successful start of the motor, and this method is not affected by the load characteristics of the motor. ...

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Abstract

The invention provides a method for starting a motor without sensor in order to overcome the shortcoming of the starting method by controlling a permanent magnetic motor based on no motor in the prior art. The method has strong commonality and wide suitable scope, can smoothly switch to a speed closed ring control from a speed opened ring control and is free from being affected by loading feature. In the process of switching to the speed closed ring control from the speed opened ring control, a rotor position given value gradually approaches to a rotor position estimated value, so as to stably control the switching process of the speed opened and closed ring controls in the starting process of the motor, prevent the current of the motor from suddenly changing, stabilize the motor revolving speed, greatly decrease the motor vibration and promote the success ratio of switching. Furthermore, the method is free from being affected by loading feature in the switching process and has strongcommonality and wide suitable scope.

Description

technical field [0001] The invention relates to the technical field of motor control, and more specifically, to a sensorless-based motor starting method. Background technique [0002] The permanent magnet motor needs to detect the actual speed and position of the rotor to realize the commutation of the winding during operation. Therefore, a rotor speed and position detection device is required, and sensors are usually used to detect the rotor speed and position. This increases the cost of the system. In air conditioners, washing machines, refrigerators and other electrical products, due to the limitation of space and actual working conditions, the installation of sensors is inconvenient. In some occasions, it is not even allowed to install sensors. reliability will be reduced. [0003] Therefore, the use of sensorless control methods in the control of permanent magnet motors has become the mainstream research direction. The principle of sensorless control is to detect the b...

Claims

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Application Information

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IPC IPC(8): H02P6/20H02P6/18H02P21/00
Inventor 邹积浩叶林华
Owner 东元总合科技(杭州)有限公司
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