Control method for reducing traction pulsation of linear induction motor

A technology of linear induction motor and control method, which is applied in the direction of motor generator control, AC motor control, electronic commutation motor control, etc., can solve the problems of strong dependence on time-varying parameters of the motor, and achieve the avoidance of edge effects and high response speed Fast, less dependent effects

Active Publication Date: 2010-07-28
INST OF ELECTRICAL ENG CHINESE ACAD OF SCI
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Problems solved by technology

[0004] The technical problem to be solved by the present invention is to propose a control method for reducing the traction force pulsation of a linear i

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  • Control method for reducing traction pulsation of linear induction motor
  • Control method for reducing traction pulsation of linear induction motor
  • Control method for reducing traction pulsation of linear induction motor

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[0022] The present invention will be further described below in conjunction with the drawings and specific embodiments.

[0023] figure 2 Shown is the control block diagram of the control method of the present invention. Such as figure 2 As shown, the DC bus voltage U of the inverter 6 is detected online dc , Inverter control signal S of the previous control cycle abc And the primary phase current of the linear induction motor 7, the coordinate transformation unit 8 is used to calculate the primary phase voltage and phase current of the linear induction motor 7 in the two-phase stationary coordinate system α, β axis components u αs , U βs And i αs , I βs . Then u αs , U βs And i αs , I βs Input to the flux observation unit 9 and traction observation unit 10 to obtain the actual primary flux linkage value ψ of the linear induction motor 7 s And its α and β axis components ψ αs , Ψ βs And flux vector space θ n And the actual traction F t , And then use the average traction force...

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Abstract

The invention relates to a control method for reducing the traction pulsation of a linear induction motor. The control method comprises the following steps: obtaining actual primary magnetic flux linkage value, actual traction and average traction of the linear induction motor by measuring the DC bus voltage of an inverter and the primary phase current of the linear induction motor on line; and meanwhile, detecting the running speed of the linear induction motor in real time, and determining an inverter on-off signal to control the on-off action of the inverter by combining a control algorithm for reducing traction pulsation, an inverter on-off control table and a PWM modulation algorithm, thereby enabling the actual values of the traction and the primary magnetic flux linkage of the linear induction motor to track the given values quickly. The method can realize accurate and direct traction control on the linear induction motor, obviously reduce the traction pulsation of the motor and avoid the influence of end effect, parameter variation and the like on control performance.

Description

technical field [0001] The invention relates to a method for controlling a linear induction motor. Background technique [0002] A linear induction motor is a motor that can directly produce linear mechanical motion. In the field of rail transportation, compared with the train system driven by the rotary induction motor, the train driven by the linear induction motor has the advantages of fast acceleration, low noise, strong climbing ability, small turning radius and low operation and maintenance costs. The above advantages make the linear induction motor rail transit system get more and more attention and application. However, due to the disconnection of the core of the linear induction motor and the asymmetry of the structure, there are edge effects. In addition, the vibration generated during the operation of the train will cause the change of the primary and secondary air gaps of the motor. The existence of edge effects and the change of the air gap of the motor make ...

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Application Information

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IPC IPC(8): H02P25/06H02P21/10H02P21/00H02P25/062
Inventor 杜玉梅李耀华金能强张瑞华刘育红
Owner INST OF ELECTRICAL ENG CHINESE ACAD OF SCI
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