Electromagnetic Bearingless Doubly Salient Motor and Its Control Method

Abstract

The invention discloses an electromagnetic bearingless double salient pole motor and a control method thereof, belonging to the technical field of bearingless motors. The motor includes: stator core, rotor core, armature winding, excitation winding, suspension winding, the rotor core includes several rotor tooth poles, the stator core includes several stator poles composed of several stator tooth poles, and the space between adjacent stator poles The gap forms a stator slot. The armature coils wound on the stator tooth poles are connected according to the same principle of the change of the magnetic flux of the turn linkage to form an armature winding. The stator slots are embedded with excitation coils and suspension coils wound on the stator poles. The excitation coils wound on each stator pole are connected in sequence to form an excitation winding, and the suspension coils at radially opposite positions in space are connected to form a suspension winding in the α-axis direction and a suspension winding in the β-axis direction to generate an orthogonal suspension magnetic field respectively. The levitation force is controlled by an independent levitation winding to avoid the nonlinear coupling problem, and the levitation current and the excitation current are controlled separately to realize mutual decoupling between the motor output and the levitation.

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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