Abstract
In order to solve the problems of low integration, low reliability, and high cost caused by mechanical sensors used in bearingless permanent magnet synchronous motor (BPMSM) control systems, a novel speed and displacement sensorless control method using a least-squares support vector machine (LS-SVM) left inverse system is proposed in this paper. Firstly, the suspension force generation principle of the BPMSM is introduced, and the mathematical model of the BPMSM is derived. Secondly, the observation principle of the left inverse system is explained, and the left reversibility of the established speed and displacement subsystem is proved. Thirdly, the left inverse systems of the speed and displacement subsystems are constructed by using the LS-SVM, and the complete speed and displacement sensorless control system is constructed. Finally, the simulations and experiments of the proposed method are performed. The research results demonstrate that the proposed observation method can identify the speed and displacement quickly and accurately, and the sensorless control method can realize the stable operation of the BPMSM without speed and displacement sensors.
Highlights
Bearingless motors can be divided into different types, such as the bearingless permanent magnet synchronous motor (BPMSM) [1], bearingless synchronous reluctance motor [2], bearingless induction motor [3], and bearingless flux-switching permanent magnet motor [4,5]
The BPMSM displacement sensorless control system is constructed by combining the suspension force control method mentioned above with the proposed displacement self-sensing method
In order to verify the proposed displacement sensorless control method, the radial displacement observation experiment was carried out when the BPMSM was running at
Summary
As a successful application of magnetic suspension technology in the field of motor drives, bearingless motor technology achieves the integration of rotor rotation and magnetic suspension simultaneously [1,2,3,4,5]. In [20], a rotor displacement self-sensing method using the difference of symmetric-windings flux linkages based on the symmetrical structure of a sixphase single-winding bearingless flux-switching permanent magnet machine is proposed. This method is only applicable to the proposed motor. Much of the research on the sensorless control methods of the bearingless motors listed in the previous paragraph only focus on one aspect; that is, either the speed sensorless control or the displacement sensorless control Both the photoelectric encoder and the probes of the eddy current displacement sensors are installed on the motor, increasing the volume and reducing reliability.
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