Electromagnetic no-bearing doubly salient motor and control method

Abstract

The invention discloses an electromagnetic no-bearing doubly salient motor and a control method, and belongs to the no-bearing motor technology field. The motor comprises a stator iron core, a rotor iron core, an armature winding, an excitation winding and a suspension winding. The rotor iron core comprises a plurality of rotor tooth electrodes. The stator iron core comprises a plurality of stator electrodes composed of several stator tooth electrodes. A gap between adjacent stator electrodes forms a stator groove. Armature coils wound on the stator tooth electrodes are connected according to a principle which is the same as the turn chain magnetic flux change rule and the armature winding is formed. An excitation coil and a suspension coil wound on the stator electrode are embedded in each stator groove. The excitation coils wound on the stator electrodes are connected in order and form the excitation winding. The suspension coils in spatial radial relative positions are connected and form an alpha-axis direction suspension winding and a beta-axis direction suspension winding which generating an orthogonal suspension magnetic field respectively. The independent suspension winding is employed to control the suspension force and the non-linear coupling problem is avoided. A suspension current and an excitation current are controlled individually to achieve mutual coupling between motor output and suspension.

Description

technical field [0001] The invention discloses an electromagnetic bearingless double salient pole motor and a control method thereof, belonging to the technical field of bearingless salient pole motors. Background technique [0002] The stator and rotor of the switched reluctance motor are salient pole structures, the stator is wound with a concentrated winding, and the rotor has neither permanent magnets nor windings. The structure is simple and firm, and it is easy to maintain. Therefore, the switched reluctance motor has high-temperature environment and high-speed operation adaptability. However, high speed will inevitably cause problems such as heating and wear of mechanical bearings, shorten the life of bearings, affect the normal operation of the motor, reduce the reliability of the system, and greatly weaken the advantages of reluctance motors suitable for high-speed operation. [0003] Compared with mechanical bearings, magnetic bearings can realize the non-contact ...

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Problems solved by technology

[0005] The technical problem to be solved by the present invention is to provide an electromagnetic bearingless double-salient pole motor and its control method in view of the deficiencies of the above-mentioned background technology. The motor uses the excitation winding wound on the stator pole to realize the excitation of the motor without the permanent magnet To simplify the structure and provide a bias magnetic field at the same time, the levitation force is controlled by an independent levitation winding to avoid nonlinear coupling problems. The mutual decoupling between them solves the technical problems that the existing bearingless motors are difficult to run stably at high speed, the demagnetization of the permanent magnets leads to the performance degradation of the motors, and the coupling of excitation and suspension control leads to complex control methods and relies on more power devices.

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