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Sensor-less control method and sensor-less control device for permanent-magnet synchronous motor

A technology of permanent magnet synchronous motor and control method, which is applied in the direction of motor generator control, electromechanical transmission control, electronic commutation motor control, etc., and can solve the problems of limited rapidity and anti-interference ability

Inactive Publication Date: 2013-05-22
NANJING INST OF TECH
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Problems solved by technology

[0004] This method first observes the back electromotive force of the motor by constructing a sliding mode observer, and then directly or indirectly estimates the rotor position and speed from the back electromotive force. It has the characteristics of simple principle and good stability. When the load is disturbed, the speed and anti-interference ability of this method are very limited

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  • Sensor-less control method and sensor-less control device for permanent-magnet synchronous motor

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Embodiment Construction

[0055] Below in conjunction with accompanying drawing, the present invention is described in further detail:

[0056] The present invention designs a sensorless control method for a permanent magnet synchronous motor, comprising the following specific steps:

[0057] Step (1): Collect the three-phase current i of the permanent magnet synchronous motor a i b i c , and carry out the Clark transformation to convert to the equivalent current i in the α-β coordinate system a i β ;

[0058] Step (2): According to the equivalent current i in the α-β coordinate system in step (1) a i β And the equivalent voltage u in the α-β coordinate system a , u β A fractional-order sliding mode observer is constructed, and the fractional-order sliding mode observer outputs the observed value of back electromotive force under the α-β coordinate system

[0059] Step (3): Use the back EMF observations in the α-β coordinate system in step (2) Realize the estimation of the electronic angul...

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Abstract

The invention discloses a sensor-less control method for a permanent-magnet synchronous motor. The sensor-less control method includes converting three-phase current of the permanent-magnet synchronous motor into equivalent current i alpha and i beta in an alpha-beta coordinate system; constructing a frictional order sliding-mode observer according to the equivalent current i alpha and i beta and equivalent voltage u alpha and u beta in the alpha-beta coordinate system, outputting counter electromotive force observed value in the alpha-beta coordinate system so as to realize estimation of angular velocity of rotors and positions of the rotors of the motor according to the counter electromotive force observed value. The invention further relates to a sensor-less control device for the permanent-magnet synchronous motor. By the sensor-less control method and the sensor-less control device for the permanent-magnet synchronous motor, counter electromotive force of the motor and position and speed of the rotors can be estimated quickly and accurately on conditions of parameter perturbation and load disturbance of a permanent-magnet synchronous motor control system, and interference resistance capacity of the system can be improved effectively.

Description

technical field [0001] The invention relates to a sensorless control method and a control device for a permanent magnet synchronous motor, belonging to the technical field of AC servo motor control. Background technique [0002] Permanent magnet synchronous motors have the advantages of high power density, high energy conversion efficiency, wide speed range, small size, light weight, etc., and are widely used in industrial, civil, military and other fields. [0003] The control of the permanent magnet synchronous motor needs to obtain the position and speed information of the motor rotor. At present, the commonly used position sensors include photoelectric encoders, resolvers and other devices. The use of these devices not only increases the size and cost of the system, but also reduces the system cost. The reliability of the permanent magnet synchronous motor also limits the application in special environments, so the sensorless control method has become a research hotspot ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02P21/14H02P21/18H02P21/24
Inventor 黄家才李宏胜徐庆宏张爽
Owner NANJING INST OF TECH
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