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Sensorless control method of flux switching type permanent magnet linear motor based on novel sliding mode observer

A technology of permanent magnet linear motor and sliding mode observer, which is applied in the direction of electronically commutated motor control, motor generator control, AC motor control, etc., can solve the discontinuity of switching function, reduce the accuracy of estimated position, and large chattering of the system and other problems, to achieve the effect of reducing system chattering, improving precision and high precision

Pending Publication Date: 2020-01-03
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS +1
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Problems solved by technology

However, due to the discontinuity of the switching function, the system will generate large chattering; at the same time, the use of the arctangent function will reduce the accuracy of the estimated position

Method used

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  • Sensorless control method of flux switching type permanent magnet linear motor based on novel sliding mode observer
  • Sensorless control method of flux switching type permanent magnet linear motor based on novel sliding mode observer
  • Sensorless control method of flux switching type permanent magnet linear motor based on novel sliding mode observer

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Embodiment Construction

[0047] The present invention provides a kind of LFSPM motor position sensorless control method based on sliding mode observer method, for making the object of the present invention, technical scheme and effect are clearer, definite, and with reference to accompanying drawing, the present invention is further described in detail. It should be understood that the specific implementations described here are only used to explain the present invention, not to limit the present invention.

[0048] Step 1: Obtain the three-phase current i of the flux-switching permanent magnet linear motor through A / D sampling a i b i c , and after 3s / 2s (Clarke) transformation, the current i in the two-phase stationary coordinate system is obtained α and i β ; Combining the bus voltage and duty ratio signal, the voltage u under the two-phase stationary coordinate system is obtained through 3s / 2s (Clarke) transformation α and u β ;

[0049]

[0050]

[0051] where S a , S b , S c is th...

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Abstract

The invention discloses a sensorless control method of a flux switching type permanent magnet linear motor based on a novel sliding mode observer. The improved sliding mode observer is used for estimating the position and speed information of a motor rotor to achieve the sensorless speed closed-loop vector control of the motor. A Sigmoid function is used for replacing a switching function in a traditional sliding mode observer to greatly reduce system buffeting, self-adaptive feedback gain is introduced to expand the working speed range of the sliding mode observer, and the speed and the position of the motor are estimated from observed counter electromotive force through a phase-locked loop. The sensorless control method of a flux switching type permanent magnet linear motor based on a novel sliding mode observer avoids installation of a position sensor, reduces the system cost and improve the reliability.

Description

technical field [0001] The invention relates to a positionless control method of a magnetic flux switching type permanent magnet linear motor based on a novel sliding mode observer, which is suitable for the field of long-stroke drive systems such as rail traffic with high cost of position sensors. Background technique [0002] The permanent magnets and armature windings of the flux-switching permanent magnet linear motor (LFSPM) are placed on the primary short mover, while the secondary long stator consists of magnetically permeable material only. Compared with linear induction motors and permanent magnet synchronous linear motors, LFSPM motors have the advantages of low cost, high efficiency and high thrust density at the same time, and have broad application prospects in the field of rail transit drive systems. High-performance LFSPM motor control requires accurate position and speed information, but expensive position sensors such as grating scales will increase the cost...

Claims

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Application Information

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IPC IPC(8): H02P21/05H02P21/13H02P21/28H02P21/18H02P25/022H02P25/064H02P27/08
CPCH02P21/05H02P21/13H02P21/28H02P21/18H02P25/022H02P25/064H02P27/08
Inventor 曹瑞武蒋宁王凯王支业王业彬王秋岭
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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