Permanent magnet/reluctance rotor double-stator motor three-closed-loop vector control system and method

Abstract

The invention relates to a permanent magnet / reluctance rotor double-stator motor three-closed-loop vector control system and method, in particular to a permanent magnet / reluctance hybrid rotor double-stator synchronous motor three-closed-loop vector control method based on a load torque observer and a sliding mode speed controller. And a torque closed loop is added between a rotating speed loop and a current loop by combining a load torque observer theory, so that a rotating speed, torque and current three-closed-loop control system is formed, and the precision of the novel motor vector control system is further improved.

Description

technical field [0001] The invention belongs to the technical field of vector control of dual-stator low-speed and high-torque motors, and in particular relates to a three-closed-loop vector control system of a permanent magnet / reluctance hybrid rotor dual-stator synchronous motor based on a load torque observer and a sliding mode speed controller. Background technique [0002] The low-speed and high-torque permanent magnet motor direct drive system replaces the traditional system with a reduction gear box. It has the advantages of small size, low noise, high efficiency and low maintenance cost. It is widely used in heavy machine tools, coal mine conveyor belts, ship electric propulsion and other high energy Power consumption drive field. [0003] In order to make full use of the large cavity space of the low-speed and high-torque direct drive permanent magnet synchronous motor and improve the torque density, some scholars have proposed a motor with a double stator structure...

AI Technical Summary

Problems solved by technology

The performance of the PI controller is susceptible to system parameter changes, external disturbances, etc., which will reduce the reliability of system operation and dynamic and static performance. Conventional PI control cannot meet the requirements of high-performance control.

[0005] In order to solve the problems caused by traditional PI control, scholars at home and abroad have conducted a lot of research, and some modern control theoretical achievements have been successfully applied to the vector control system of permanent magnet synchronous motors. Among them, the sliding mode control is characterized by its strong robustness and fast dynamic response. and other advantages have gradually become the focus of research, and are widely used in AC motor speed control systems, but due to other conventional Compared with the AC motor, it has a more complex mathematical model, and also has the characteristics of nonlinearity, multivariable, strong coupling, and variable parameters. The traditional speed control theory cannot be directly applied to this new type of motor, and the traditional AC motor vector control system uses speed, The current double closed-loop topology, and the vector control is to indirectly control the electromagnetic torque of the motor by controlling the d and q axis currents. The electromagnetic torque cannot be directly controlled, which will cause the system to suffer from parameter changes, current sampling errors, and inverter dead zones. Electromagnetic torque cannot be precisely controlled under non-ideal conditions such as

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