Constant slip frequency vector control method and system for linear induction motor

A technology of linear induction motor and slip frequency, which is applied in the direction of vector control system, control system, motor generator control, etc., can solve problems such as inability to keep constant, and achieve the effect of smooth orientation angle of flux linkage

Active Publication Date: 2008-12-03
ZHUZHOU CSR TIMES ELECTRIC CO LTD
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Problems solved by technology

Therefore, the slip frequency electrical angular velocity Wsl will also change with the change of the given torque T, and cannot be kept constant

Method used

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  • Constant slip frequency vector control method and system for linear induction motor
  • Constant slip frequency vector control method and system for linear induction motor
  • Constant slip frequency vector control method and system for linear induction motor

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Embodiment Construction

[0057] In order to make the above objects, features and advantages of the present invention more comprehensible, the present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0058] refer to figure 2 , is a flow chart of the constant slip frequency vector control method for the linear induction motor described in the embodiment of the present invention.

[0059] The linear induction motor constant slip frequency vector control method includes the following steps:

[0060] Step S10: detecting the rotor speed of the linear induction motor, and calculating the rotor flux spatial position angle θs in combination with a given slip frequency electrical angular velocity Wsl.

[0061] The calculation of the rotor flux linkage spatial position angle θs in step S10 specifically includes the following steps:

[0062] Step S101: detecting the rotor speed of the linear induction motor, and converting the rotor s...

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Abstract

The invention discloses a linear induction motor constant slip frequency vector control method. The method comprises the steps as follows: detecting the rotation speed of a rotor of a linear induction motor, calculating the magnetic chain space position angle Theta<s> of the rotor according to the given slip frequency electric angular velocity Wsl; calculating the excitation voltage Usm and torque voltage Ust according to the magnetic chain space position angle Theta<s> and the given slip frequency electric angular velocity Wsl and combining a given torque T and a rotor time constant Tr; generating modulation pulses by pulse-modulating the excitation voltage Usm and the torque voltage Ust and the DC voltage output by the power supply; converting the DC voltage output by the power supply into the AC electricity so as to be supplied to the linear induction motor according to the modulation pulse. The invention also discloses a linear induction motor constant slip frequency vector control system. The linear induction motor constant slip frequency vector control method and system of the invention can realize the constant slip frequency vector control of the linear induction motor.

Description

technical field [0001] The invention relates to the field of motor vector control, in particular to a constant slip frequency vector control method and system of a linear induction motor. Background technique [0002] Generally, the motor rotates when it works. When a vehicle driven by a rotating motor (such as an electric locomotive and a tram in a city, etc.) is used for linear motion, it is necessary to add a set of devices for converting rotary motion into linear motion in the rotary motor to form a linear motion drive device. [0003] In recent years, with the rapid development of automatic control technology and microcomputers, higher requirements have been put forward for the positioning accuracy of various automatic control systems. The motion drive device is far from meeting the requirements of modern control systems. For this reason, in recent years, many countries in the world are researching, developing and applying linear induction motors, which makes the appl...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02P21/00H02P25/06H02P27/08H02P21/14H02P25/062
Inventor 刘可安尚敬杨大成梅文庆
Owner ZHUZHOU CSR TIMES ELECTRIC CO LTD
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