Permanent-magnet linear motor based on arc-shaped and inner-step shaped hybrid structure of stator

Abstract

The invention discloses a permanent-magnet linear motor based on an arc-shaped and inner-step shaped hybrid structure of a stator. The motor comprises a stator armature primary side and a Halbach permanent-magnet mover secondary side, the stator armature primary side is located on the outer side of the permanent-magnet mover secondary side, the stator armature primary side is formed by a stator iron core and an armature winding, inner-step shaped structures are adopted by the ends of two sides of the stator iron core, and arc-shaped structures are adopted by inner teeth of the stator iron core; the permanent-magnet mover secondary side is formed by a mover iron core and a permanent magnet adhering to the surface the of the iron core, and a Halbach array structure is adopted by the permanent magnet. By means of the motor, air gap magnetic flux larger than a conventional magnet can be obtained, the motor has a better magnetic shielding effect, and the thickness of a magnetic conductive yoke of the mover can be reduced. The invention provides an analysis model of an arc-shaped tooth structure, and the magnitude of magnetic conductance and a magnetic conductance-position variation curve can be derived by means of the model. The optimal structure of the motor is obtained by adopting a Taguchi optimization algorithm.

Description

technical field [0001] The invention belongs to the fields of electric engineering and motors, and relates to a permanent magnet synchronous linear motor. Background technique [0002] With the continuous advancement of science and technology, the electromechanical industry is increasingly developing towards high precision and high efficiency. The permanent magnet synchronous linear motor direct drive technology has become the most representative advanced technology. The linear motor can provide a direct linear drive. Compared with the traditional rotary motor with ball screw structure, there is no intermediate transmission link, and it has the advantages of high rigidity, high thrust, fast response, outstanding energy saving, and maintenance-free. Widely used in aerospace, precision machining and other fields. [0003] The permanent magnet synchronous linear motor is directly connected to the load rigidly, replacing the linear feeding method of the traditional ball screw. ...

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Problems solved by technology

[0003] The permanent magnet synchronous linear motor is directly connected to the load rigidly, replacing the linear feeding method of the traditional ball screw. Due to the cancellation of the intermediate transmission device, the disturbance of the load force and the external environment on the table will be directly fed back to the permanent magnet synchronous linear motor. Motor, so that the motor produces a certain thrust fluctuation, which will cause mechanical vibration, noise and speed oscillation, thereby deteriorating its servo operation characteristics, such as position tracking accuracy

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