A model predictive torque control method for built-in permanent magnet synchronous motor

Abstract

The invention discloses a model prediction torque control method for an internal permanent-magnet synchronous motor. The model prediction torque control method has the advantages that through system sampling and a motor mode, time delay of a digital system is compensated, and a motor reference torque Te* is calculated, so that reference current d-component and q-component are calculated accordingto the maximum torque current ratio; corresponding permanent-magnet torques, reluctance torque components and stator flux linkage d-component and q-component are predicted by the motor model and alternative space voltage vectors; light load and heavy load of the motor are judged, and the optimal voltage vector is solved, in other words, permanent-magnet torque and reluctance torque evaluation functions are used when the motor is in a heavy load condition, and flux linkage vector evaluation functions are used in case of light load; the solved voltage vector is applied to the motor. The model prediction torque control method for the internal permanent-magnet synchronous motor has the advantages that torques generated under the control of the maximum torque current ratio are analyzed, the evaluation functions without coefficient setting are designed, and good torque control effect can be achieved during heavy load of the motor.

Description

technical field [0001] The invention relates to a motor model predictive torque control method. In particular, it relates to a model predictive torque control method for a built-in permanent magnet synchronous motor. Background technique [0002] With the rapid development of power electronics technology, people use electric energy more widely, and the motor as a bridge for energy conversion has received unprecedented attention. Among them, the built-in permanent magnet synchronous motor is widely used in industrial manufacturing, rail transportation, aerospace and other fields due to its good reliability and high power density. The traditional built-in permanent magnet synchronous motor control mainly aims to obtain the maximum torque-current ratio of the motor. The control strategy mainly includes space vector control and direct torque control. Among them, direct torque control has simple structure, good dynamic performance and Strong robustness and other advantages. Ho...

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Problems solved by technology

However, since the direct factor of the motor speed control is the torque, but this method does not set the torque as a direct control amount, so the dynamic response of the motor and the control effect of the torque are deteriorated, and further improvement is still needed

[0005] The evaluation function of the traditional model predictive torque control consists of two components: torque and flux linkage. Since the units of the two components are different, it is generally necessary to design corresponding coefficients to achieve simultaneous control of different unit components, and the selection of this coefficient is cumbersome.

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