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Method for reducing chattering of permanent magnet synchronous motor speed sensorless sliding mode control

A permanent magnet synchronous motor and speed sensorless technology, which is applied in motor control, motor generator control, AC motor control, etc., can solve problems such as chattering and switching function discontinuity, achieve flexible system control, and solve sliding mode control Effect of Chattering Phenomenon

Inactive Publication Date: 2020-11-27
XIAN THERMAL POWER RES INST CO LTD
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Problems solved by technology

It uses a sign function to replace the actual value of the deviation, and the resulting high gain characteristic improves the convergence speed of the observer, but the traditional sliding mode observer has a large number of high-order harmonics in the system because of the discontinuity of the switching function, that is, jitter vibration phenomenon

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  • Method for reducing chattering of permanent magnet synchronous motor speed sensorless sliding mode control
  • Method for reducing chattering of permanent magnet synchronous motor speed sensorless sliding mode control
  • Method for reducing chattering of permanent magnet synchronous motor speed sensorless sliding mode control

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Embodiment Construction

[0045] The technical solution of the present invention will be described in further detail below with reference to the accompanying drawings.

[0046] Such as figure 1 As shown, assuming that the three-phase windings are symmetrical, ignoring the eddy current loss and electromagnetic hysteresis loss of the motor, the voltage equation of the motor is:

[0047]

[0048] In formula (1), U a , U b , U c Are the terminal voltages of the three-phase windings; i a , I b , I c Are the phase currents of the three-phase windings; e a , E b , E c They are the opposite electromotive force of the three-phase windings; R and L are the phase resistance and equivalent inductance of the windings. The stator current of the motor in the PMSM three-phase coordinate system can be equivalent to the stator current i in the two-phase coordinate system through the 3s→2s transformation. α , I β . Through coordinate transformation, PMSM can be equivalent to a DC motor model, and PMSM control can be realized ...

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Abstract

The invention discloses a method for reducing chattering of permanent magnet synchronous motor speed sensorless sliding mode control. The method comprises the steps of establishing a mathematical model of a PMSM under an alpha-beta coordinate system; and constructing a sliding mode observer to calculate the rotating speed in real time. In allusion to a sliding mode chattering phenomenon caused bya discontinuous sign function of a traditional sliding mode observer, the invention constructs a novel piecewise exponential function, the novel switching function can be divided into a part inside asliding mode switching plane and a part outside the sliding mode switching plane; a current error is enabled to have a saturation characteristic outside the thickness of a plane boundary layer, and within the thickness of the plane boundary layer, the system control is enabled to be more flexible by changing the slope of the switching function, so that the observed value can quickly and stably reach the sliding mode switching plane. According to the method, the gain in sliding mode control is analyzed according to the Lyapunov theory by taking asymptotic stability of sliding mode control as atarget.

Description

Technical field [0001] The invention relates to a method for reducing chattering of a speed sensorless sliding mode control of a permanent magnet synchronous motor, which is a method for suppressing the chattering phenomenon of the sliding mode control by replacing the traditional sign function with a new switching function. The new sliding mode observer is used in the speed sensorless control system of permanent magnet synchronous motor, and the sliding mode control gain is analyzed. Background technique [0002] Permanent Magnet Synchronous Motor (PMSM) is widely used in the fields of high-efficiency and energy-saving fans and compressors in power plants because of its strong load capacity. Traditional PMSM installs a speed sensor on the shaft to detect the motor speed in real time to achieve vector control of the motor speed. In order to save volume and cost, the use of algorithms to achieve vector control of motor speed has become a hot topic in the field of motor control. ...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02P21/00H02P21/05H02P21/13H02P21/18H02P6/10H02P6/34H02P25/026H02P27/08
CPCH02P21/0007H02P21/05H02P21/13H02P21/18H02P6/10H02P6/34H02P25/026H02P27/08H02P2205/01H02P2207/05
Inventor 杨沛豪何凯琳王小辉孙梦瑶李元钊薛磊赵俊博
Owner XIAN THERMAL POWER RES INST CO LTD
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