Permanent magnet synchronous motor dead beat direct torque control system and permanent magnet synchronous motor dead beat direct torque control method
A permanent magnet synchronous motor, direct torque control technology, applied in the control system, vector control system, motor generator control and other directions, can solve the problems of large torque ripple, slow torque response, etc., to achieve small torque ripple , fast response, improve the effect of running performance
Active Publication Date: 2017-09-12
SOUTHEAST UNIV
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[0004] Purpose of the invention: In order to solve the problems of slow torque response and large torque ripple caused by the vector control or direct torque control of the permanent magnet synchronous motor in the prior art, the present invention proposes a permanent magnet synchronous motor The deadbeat direct torque control system and control method, based on the discrete state observer to predict the stator current, realize the deadbeat direct torque control of the permanent magnet synchronous motor
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[0035] The present invention will be further described below in conjunction with the accompanying drawings.
[0036] figure 1 The deadbeat direct torque control system of permanent magnet synchronous motor mainly includes: encoder, state observer, deadbeat controller, SVPWM modulation module, inverter. Magnetic synchronous motor a, b phase current i a (k), i b (k), the stator current in the two-phase rotating coordinate system is obtained by Clarke and Park transformation Similarly, the stator phase voltage is processed in the same way to get Will And the motor rotation electrical angular velocity ω obtained by the encoder sampling calculation r Input the state observer to calculate the predicted value of stator flux linkage and electromagnetic torque in the next control cycle and Te * . The motor speed n measured by the encoder and the speed given value n ref The deviation of the electromagnetic torque given value Te is calculated by the PI regulator ref , and the...
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The invention discloses a permanent magnet synchronous motor dead beat direct torque control system and a permanent magnet synchronous motor dead beat direct torque control method, which are used to solve problems of permanent magnet synchronous motors such as low torque response and large torque ripple caused by adopting conventional vector control or direct torque control. By adopting the permanent magnet synchronous motor dead beat direct torque control method, according to a relation among the voltage, the current, the magnetic flux linkage, and the electromagnetic torque of the permanent magnet synchronous motor, a state observer is built by adopting a numerical integration principle in a discrete state, and at the same time, observation errors are eliminated by introducing a PI regulator, and therefore accurate prediction of a system state in the next control period is realized. The permanent magnet synchronous motor dead beat direct torque control system is established based on the above mentioned observer, and the fast torque response is maintained, and at the same time, the torque ripple is reduced, and therefore the operation performance of the permanent magnet synchronous motor is improved.
Description
technical field [0001] The invention belongs to the technical field of motors, and in particular relates to a deadbeat direct torque control system and a control method of a permanent magnet synchronous motor. Background technique [0002] The main application object of the invention is a permanent magnet synchronous motor for an electric vehicle. There are two types of permanent magnet synchronous motors for electric vehicles: centralized drive type and hub drive type. The centralized drive permanent magnet synchronous motor is small in size, light in weight and high in torque density. The wheel hub drive field modulated permanent magnet in-wheel motor (which is also a permanent magnet synchronous motor in essence) is based on the principle of magnetic field modulation and has the ability to output low speed and high torque. characteristics, they all have great application prospects in electric vehicle drive systems. At present, the control strategy of permanent magnet sy...
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Login to View More IPC IPC(8): H02P21/00H02P21/13H02P21/30
CPCH02P21/0003H02P21/13H02P21/30
Inventor 樊英王武森
Owner SOUTHEAST UNIV