CN117254616A

CN117254616A - Axial flux motor with stator having hoof-shaped winding iron core

Info

Publication number: CN117254616A
Application number: CN202311276608.2A
Authority: CN
Inventors: 赵知洋
Original assignee: Individual
Current assignee: Individual
Priority date: 2023-10-05
Filing date: 2023-10-05
Publication date: 2023-12-19

Abstract

The patent discloses an axial flux motor with winding iron core is stator of hoof shape belongs to the motor equipment field. The winding lamination of the axial flux motor is a hoof-shaped winding, the hoof-shaped winding is a stator winding, and the hoof of the hoof-shaped winding corresponds to the permanent magnet of the permanent magnet rotor.

Description

Axial flux motor with stator having hoof-shaped winding iron core

Technical Field

The patent relates to the field of motor equipment, and mainly relates to an axial flux motor with a stator with a hoof-shaped winding iron core.

Background

Currently, axial flux machines are mainly rotor discs with permanent magnets and stators with windings, wherein the windings of the stator are open, and the structure of the magnetic path is "air-stator-air gap-rotor-air gap-stator-air" (single rotor double stator structure) or "air-rotor-air gap-stator-air gap-rotor-air" (double rotor single stator structure), i.e. the flux path of the axial flux machine is non-closed-loop. This results in a large area air structure with lower permeability in the flux path; that is, in the flux distribution, the remaining flux is a stray field except for the two stator windings and the region therebetween.

This discontinuous high permeability flux path structure reduces the excitation efficiency of the winding coil; meanwhile, the stray magnetic field area can lose part of the magnetic field intensity, and the whole level of the magnetic field is further weakened. In contrast, a continuous, closed loop magnetic field results in improved excitation efficiency and reduced stray levels of the magnetic field level.

For the stator winding structure of the axial flux motor with a single-rotor double-stator structure, the existing winding structure is a winding iron core opposite to a rotor permanent magnet, so that the winding wire and the winding iron core in the stator winding compete for an area opposite to a rotor. In the case of a fixed stator thickness of an axial flux electric machine, the coil structure duty ratio of the stator winding and the core structure duty ratio of the stator winding are exclusive on the axial projection plane, and the reduction of the core structure duty ratio also reduces the effective projection area of the rotor permanent magnet. Increasing the axial dimension of the stator windings can alleviate the exclusivity situation described above to some extent, but can significantly increase the stator thickness.

In contrast, compared with the sizes of the exciting coils of the two groups of stator windings, under the condition of adopting the horseshoe windings, the exciting coils can be distributed outside the winding iron core part axially facing the rotor permanent magnet, and the exciting coils can also be distributed in the area of the horseshoe windings on the outer edge side of the rotor disc, so that the size of the available winding exciting coils of the horseshoe windings is obviously improved, and the axial size of the stator windings can be obviously reduced; meanwhile, the hoof-shaped winding stator is adopted, so that the projection area of the stator winding and the rotor permanent magnet in the axial direction can be increased, the occupancy rate of the winding in the axial direction can be increased, and the excitation efficiency and the motor efficiency of the stator coil can be improved.

Accordingly, there is a need to develop an axial flux machine with a stator having a wound core in the shape of a horseshoe to improve the level of control over the magnetic field and reduce stray magnetic fields, and to improve motor torque levels and conversion efficiency.

In order to meet the use requirement and the corresponding requirement, the invention particularly provides an axial flux motor with a stator with a horseshoe-shaped winding iron core based on the situation and the requirement.

Disclosure of Invention

The technical problem to be solved by the patent is to provide an axial flux motor with a stator of which a winding iron core is in a hoof shape, wherein winding laminations of the axial flux motor are hoof-shaped windings, the hoof-shaped windings are stator windings, and pole shoes of the hoof-shaped windings are in one-to-one correspondence with permanent magnets of a permanent magnet rotor.

The rotor of the axial flux motor is a disc with permanent magnets, the stator is formed by a hoof-shaped winding, the edge of the rotor disc is surrounded by the hoof-shaped winding in a C shape, and the stator is formed by circularly arranging the hoof-shaped winding at the edge of the rotor disc. The hoof-shaped winding consists of a hoof-shaped iron core and an excitation coil wound on the hoof-shaped iron core; the exciting coils are wound and distributed on the horseshoe-shaped iron core, and the coverage area of the exciting coils comprises the whole structural range of the horseshoe-shaped iron core.

The hoof-shaped iron core is made of silicon steel sheets (also called electrical steel sheets, magnetic steel sheets and the like, hereinafter collectively called silicon steel sheets) and is in a laminated state.

The silicon steel and the hoof-shaped iron core structure have two combination modes: the non-oriented silicon steel sheet is formed by directly laminating a plurality of hoof-shaped structures; the other is formed by a plurality of strip-shaped oriented silicon steel sheets which are stacked and expanded in an incomplete mode to form a plurality of area parts of the horseshoe iron core.

The exciting coils wound on the hoof-shaped iron cores are electrified with current with specific waveforms, so that the adjacent hoof-shaped iron cores generate alternating magnetic fields, and the rotor disc surrounded by the hoof-shaped iron cores in annular distribution is driven.

The foregoing is a description of an exemplary embodiment of the present patent, and it should be noted that unless otherwise defined, technical or scientific terms used in this patent should be taken to have the ordinary meaning as understood by one of ordinary skill in the art to which this invention pertains; it will be apparent to those skilled in the art that various modifications and adaptations can be made without departing from the principles set forth in this patent, and such modifications and adaptations are intended to be comprehended within the scope of this patent.

The embodiments of the present patent are described below in conjunction with the drawings, it being understood that the embodiments described herein are for illustration and explanation of the present patent only and are not intended to limit the present patent.

For a clearer description of the embodiments or technical solutions of the present patent, the accompanying drawings that are needed in the description of the embodiments will be briefly introduced below, and it is obvious that the accompanying drawings in the description only show some embodiments of the present patent and should not be considered as limiting the scope, and other related drawings can be obtained according to these drawings without inventive effort for a person of ordinary skill in the art.

Fig. 1 is a schematic diagram of a stator and a rotor of an axial flux motor having a stator with a horseshoe-shaped winding core.

1-a rotor structure with permanent magnets; 2-a horseshoe core structure of a stator.

Fig. 2 is a schematic diagram of a horseshoe core structure implemented in this patent.

Fig. 3 is a schematic diagram of a rotor structure implemented in the present patent.

Wherein, 3-rotor disc; 4-permanent magnets; 5-shaft hole.

Fig. 4 is a schematic diagram of a horseshoe core structure and winding distribution achieved by the present patent.

Wherein, the horseshoe-shaped iron core structure of the 2-stator; 6-winding.

Claims

1. An axial flux electric machine having a stator with a winding core in the shape of a hoof, characterized in that: the axial flux motor comprises a rotor disc (3) structure with permanent magnets (4), a stator structure with exciting coils and a horseshoe iron core (2) and an electric controller;

the structure of the hoof-shaped iron core (2) is in a letter C shape, the hoof-shaped iron core (2) surrounds the edge of the rotor disc (3), and pole shoes of the hoof-shaped iron core (2) are in one-to-one correspondence with the permanent magnets (4) on the rotor disc (3);

the exciting coils are wound and distributed in the whole range area of the horseshoe iron core (2).

2. An axial flux electric machine having a stator with a winding core in the shape of a hoof, characterized in that: the C-shaped opening structure of the horseshoe iron core (2) faces the rotor disc (3).

3. An axial flux electric machine having a stator with a winding core in the shape of a hoof, characterized in that: the exciting currents of the adjacent hoof-shaped iron cores (2) are mutually independent and are provided by an electric controller.

4. An axial flux electric machine having a stator with a winding core in the shape of a hoof, characterized in that: the shoe-shaped iron core (2) is formed by laminating sheets, and the sheets are perpendicular to the plane of the rotor disc (3).

5. An axial flux electric machine having a stator with a winding core in the shape of a hoof, characterized in that: the sheet comprises a silicon steel sheet, an electrical steel sheet and a magnetic steel sheet.

6. An axial flux electric machine having a stator with a winding core in the shape of a hoof, characterized in that: one of the combination modes of the hoof-shaped iron core (2) is formed by directly laminating and combining a plurality of sheets with hoof-shaped structures.

7. An axial flux electric machine having a stator with a winding core in the shape of a hoof, characterized in that: one of the combination modes of the shoe-shaped iron core (2) is that a plurality of strip-shaped sheets are overlapped and expanded to form a plurality of area parts of the shoe-shaped iron core (2) through incomplete overlapping, so that the shoe-shaped iron core (2) is formed.