Novel permanent-magnet magnet-assisted synchronous reluctance motor

Abstract

The invention relates to a novel permanent-magnet magnet-assisted synchronous reluctance motor. The novel permanent-magnet magnet-assisted synchronous reluctance motor comprises a stator iron core, arotor iron core and a rotating shaft, wherein three-phase symmetrical windings are wound on the stator iron core; the rotor iron core is positioned in the stator iron core, an air gap is left betweenthe stator iron core and the rotor iron core, and a plurality of layers of magnetic barriers are punched on the rotor iron core, the stator iron core and the rotor iron core are formed by laminating non-oriented silicon steel sheets, the magnetic barriers are partially filled with oriented silicon steel sheets and permanent magnets, and the rest part is empty or filled with non-magnetic conductivematerials; and the rolling direction of the oriented silicon steel sheets arranged in the magnetic barriers in a filling mode is parallel to the d axis of the rotor iron core. A method of combining the oriented silicon steel sheets and the low-cost permanent magnets is adopted in the novel permanent-magnet magnet-assisted synchronous reluctance motor, and the convex range of the motor is effectively improved by utilizing the different magnetic permeability of the oriented silicon steel sheets in different directions; and meanwhile, the low-cost permanent magnets are added to the magnetic barriers, and a magnetic gathering structure is formed, so that the power density of the magnetic barriers is obviously improved.

Description

Technical field [0001] The invention relates to the technical field of synchronous reluctance motors, in particular to a new type of permanent magnet assisted synchronous reluctance motors. Background technique [0002] Compared with the DC motor, the permanent magnet-assisted synchronous reluctance motor eliminates the commutation mechanism and brushes, simplifies the structure, reduces the operating cost, and increases the reliability of the operation. Compared with induction motors, permanent magnet-assisted synchronous reluctance motors eliminate the need for squirrel cage bars or windings on the rotor core, avoid losses on the rotor core, and improve the efficiency of the motor. Compared with the permanent magnet synchronous motor, the permanent magnet assisted synchronous reluctance motor uses inexpensive ferrite permanent magnets on the rotor core to replace the expensive rare earth permanent magnets, and uses the reluctance torque to a greater extent. Under the premise o...

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Problems solved by technology

[0005] The technical problem to be solved by the present invention is: the salient pole difference of the traditional synchronous reluctance motor has a certain limit, so it is difficult to increase the reluctance torque after reaching a certain value, and it will be difficult to further increase the torque density when the load increases At the same time, because there is no excitation source on the rotor core, the stator winding needs to generate a large component for excitation, so that the power factor of the motor is low; in view of the above problems, the present invention provides a new type of permanent magnet assisted synchronous reluctance motor , by partially placing oriented silicon steel sheets and low-cost permanent magnets in the air magnetic barrier, and leaving the rest empty or placing non-magnetic materials, the salient pole difference of the synchronous reluctance motor can be greatly improved, and its rotation speed can be improved. Moment density, and the permanent magnet adopts a magnetization structure, which can effectively reduce the excitation component of the stator current, so that the power factor of the invented motor has been greatly improved

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