Method and system for controlling steady-state minimum loss of drive system of linear induction motor
A linear induction motor and drive system technology, applied in motor generator control, AC motor control, electronic commutation motor control, etc., can solve the problem of lack of system-level minimum loss control strategy
Active Publication Date: 2017-06-13
HUAZHONG UNIV OF SCI & TECH
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The current research on the minimum loss control strategy of the linear induction motor drive system based on the model method mostly focuses on the motor itself, ignoring the loss of the inverter, failing to conduct an overall study on the loss of the linear induction motor drive system, and lacking system-level Minimum Loss Control Strategy
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[0078] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention. In addition, the technical features involved in the various embodiments of the present invention described below can be combined with each other as long as they do not constitute a conflict with each other.
[0079] Such as figure 1 Shown is a schematic diagram of the principle of the steady-state minimum loss control method for the linear induction motor drive system, which is suitable for the steady-state operation of the motor. The specific implementation steps are as follows:
[0080] (1) Collect the primary current i of the linear induction motor A i B , motor speed v 2 , and determined by t...
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The invention discloses a method and system for controlling the steady-state minimum loss of a drive system of a linear induction motor. The method comprises the steps of firstly collecting primary current iA and iB and a velocity v2 of the linear induction motor and obtaining a secondary angle frequency omega r from the velocity v2; obtaining a secondary flux amplitude psi dr and a flux angle theta 1 from the iA, the iB and the omega r on the basis of a direct magnetic field orientation method; obtaining primary d-axis current ids and primary q-axis current iqs from the theta 1, the iA and the iB through coordinate transformation; obtaining electromagnetic thrust F by combining a voltage equation and a flux equation of the motor; obtaining an optimal flux value as shown in the specification on the basis of F and omega r and a drive system loss model of the linear induction motor, comparing the psi dr, omega r, ids and iqs with corresponding values as shown in the specification separately and then obtaining primary d-axis current control quantity, primary q-axis current control quantity, primary d-axis voltage control quantity and a primary q-axis voltage control quantity as shown in the specification after PI adjustment; and controlling an inverter to drive the linear induction motor to run through coordinate transformation and SVPWM modulation. The loss of the linear induction motor and the loss of the inverter can be effectively reduced under different work conditions, and the overall operating efficiency of the drive system is improved.
Description
technical field [0001] The invention belongs to the field of linear induction motors, and more specifically relates to a steady-state minimum loss control method and system for a linear induction motor drive system. Background technique [0002] The linear induction motor is derived from the rotary induction motor. The air-gap traveling wave magnetic field is established through the primary three-phase current, and the eddy current is generated in the secondary induction. The primary and secondary interactions generate direct thrust, so it is especially suitable for linear direct drive applications , such as rail transit, linear servo system, etc. Since the use of direct drive eliminates the intermediate transmission device, the linear induction motor also has the advantages of large acceleration and deceleration, low mechanical wear, low noise, etc., and has been widely developed and used in recent years. [0003] But at the same time, because the mechanical air gap of the...
Claims
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Login to View More IPC IPC(8): H02P21/00H02P25/062
CPCH02P21/0003H02P25/06
Inventor 徐伟胡冬
Owner HUAZHONG UNIV OF SCI & TECH