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System and method for controlling speedless sensor of permanent-magnet synchronous motor

A speed sensorless, permanent magnet synchronous motor technology, applied in control systems, vector control systems, motor generator control, etc., can solve problems such as limiting the application of sliding mode control methods

Active Publication Date: 2013-09-11
HENAN SUDA ELECTRIC AUTOMOBILE TECH
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  • Abstract
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Problems solved by technology

However, the sliding mode control technology will produce high-frequency chattering, which limits the application of the sliding mode control method in practical systems.

Method used

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  • System and method for controlling speedless sensor of permanent-magnet synchronous motor
  • System and method for controlling speedless sensor of permanent-magnet synchronous motor
  • System and method for controlling speedless sensor of permanent-magnet synchronous motor

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Embodiment Construction

[0072] The present invention will be described in detail below with reference to the accompanying drawings, which is a preferred embodiment among various embodiments of the present invention.

[0073] see figure 1 As shown, the present invention is a permanent magnet synchronous motor speed sensorless control system based on sliding mode embedded extended Kalman filter, including motor body unit, inverter unit, SVPWM unit, coordinate transformation unit and sliding mode extended Kalman filter The device is used to replace the traditional speed and position detection unit. The three-phase winding current i of the motor body unit a i b i c Input the stator current i transformed into the α-β coordinate system by the first coordinate transformation unit α i β , stator current i α i β Input the sliding mode extended Kalman filter and the second coordinate transformation unit, the stator current i α i β Transformed to the stator current i in the d-q coordinate system in the...

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Abstract

The invention provides a system and a method for controlling a speedless sensor of a permanent-magnet synchronous motor. The system comprises a motor body unit, an inverter unit, an SVPWM (space vector pulse width modulation) unit, a first comparator, a second comparator, a first PI (proportion and integration) controller, a second PI controller, a first coordinate conversion unit, a second coordinate conversion unit, a third coordinate conversion unit and a sliding mode extended Kalman filter. A sliding mode variable structure control law is embedded in an extended Kalman filter state equation and an output equation, a digital extended Kalman filter is finally acquired through linearization and discretization, and state evaluation of reference stator current and rotator rotating speed omega r is acquired through expanded Kalman recursion; control on the speedless sensor of a permanent-magnet synchronous motor control system is realized, and real-time updating of the reference stator current under d-q coordinates is realized. By the system and the method, control on the speedless sensor of a permanent-magnet synchronous motor can be effectively realized, high-frequency chattering generated by independently applying a sliding mode variable structure for controlling is inhibited, and accurate measurement on the speed and the position of a rotor of the motor is realized.

Description

technical field [0001] The invention belongs to the technical field of AC electric transmission, and in particular relates to a speed sensorless control system and method of a permanent magnet synchronous motor. technical background [0002] Permanent magnet synchronous motors are characterized by small size, light weight, and high efficiency, and are widely used in various high-performance drive systems. Because the permanent magnet synchronous motor has the characteristics of multi-variable, nonlinear, strong coupling, etc., the parameter changes and external load disturbance in the permanent magnet synchronous motor system affect the performance of the control system. A high-precision servo drive system needs to detect the speed and position of the motor rotor. However, the installation of traditional mechanical sensors increases the size and cost of the system, reduces the reliability of the system, and limits the application of permanent magnet synchronous motors in som...

Claims

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Application Information

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IPC IPC(8): H02P21/05
Inventor 续丹包鑫霍小宁房念兴曹秉刚
Owner HENAN SUDA ELECTRIC AUTOMOBILE TECH
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