Radial force accurate compensation decoupling control method for bearingless permanent magnet synchronous motor

Abstract

The invention provides a radial force accurate compensation decoupling control method for a bearingless permanent magnet synchronous motor. According to the method, a position controller, a force / current converter, a current controller, a radial displacement sensing module, a torque winding flux linkage and rotor angular position observer, a neural network and a voltage type inverter are included,and the method comprises the steps of offline training the neural network to determine a force-position model of the bearingless permanent magnet synchronous motor system; feeding a radial displacement sensing measurement signal and a rotor angular position observation signal back to the input end of the neural network, superposing an obtained output signal with an output signal of the position controller, thereby achieving the precise compensation decoupling control of the radial force of the bearingless permanent magnet synchronous motor. According to the method, the nonlinear coupling problem between the radial positions x and y of a rotor is solved, the dynamic and static system performance, such as the control precision and the response speed of rotor suspension, etc., is improved,and the purpose of high-precision control over the suspension subsystem of the bearingless permanent magnet synchronous motor is achieved.

Description

technical field [0001] The invention relates to the technical field of motor control, in particular to a precise compensation and decoupling control method for radial force of a bearingless permanent magnet synchronous motor, which is suitable for high-performance control of a bearingless permanent magnet synchronous motor. Background technique [0002] The bearingless motor suspends the rotor in the inner space of the motor through the force of the magnetic field, eliminating the mechanical bearing that supports the motor rotor in the traditional motor. Bearingless motors combine the functions of magnetic suspension bearings and motors, and have the advantages of no friction, no wear, no pollution, no lubrication, maintenance-free operation, high durability, high speed and high precision, and reduce system complexity compared with magnetic suspension bearings and the axial length of the rotor; bearingless motors have broad application prospects in the fields of machine tool...

AI Technical Summary

Problems solved by technology

[0004] The main purpose of the present invention is to provide a bearingless permanent magnet synchronous motor radial force accurate compensation decoupling control method to solve the problem of non-linear coupling between displacements in the α and β directions existing in the bearingless permanent magnet synchronous motor, and to improve Performances such as control accuracy and dynamic response speed of bearingless permanent magnet synchronous motor rotor suspension

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