WO2022241980A1

WO2022241980A1 - Flux-concentrating direct-drive permanent magnet electric motor

Info

Publication number: WO2022241980A1
Application number: PCT/CN2021/118507
Authority: WO
Inventors: 顾聪; 盛田田; 张云龙; 石腾瑞
Original assignee: 苏州赛得尔智能科技有限公司
Priority date: 2021-01-07
Filing date: 2021-09-15
Publication date: 2022-11-24
Also published as: CN113054762B; CN112803620A; CN113054762A

Abstract

A flux-concentrating direct-drive permanent magnet electric motor. The main structure of same comprises two components, namely, a rotor and a stator, and same can be a linear electric motor or a rotating electric motor. A plurality of permanent magnets (3, 9) in a rotor core (1) and a stator core (8) are mounted in a specifically designed manner and in a specifically designed magnetizing direction, and the rotor and the stator are assembled at specific relative positions, such that the flux-concentration effect of the plurality of permanent magnets is significant, and a relatively high utilization rate of a permanent magnetic field and a relatively small magnetic leakage coefficient are thus acquired, thereby significantly increasing the thrust density. The flux-concentrating direct-drive permanent magnet electric motor has the advantages of a high thrust density, small thrust fluctuation, being low cost, simple to machine and assemble, reliable running, easy multi-module expansion, etc.

Description

A magnetism-concentrating direct-drive permanent magnet motor

technical field

The invention relates to the technical field of permanent magnet synchronous linear motors, in particular to a magnetism-concentrating direct-drive permanent magnet motor.

Background technique

This application claims the priority of citing the following patent: a magnetism-concentrating type non-magnetic track linear motor (2021100157351).

In recent years, with the rapid development of high-end machine tools, 3C industry, laser cutting, liquid crystal panel, and lithium battery industry, for high-speed, high-precision, and long-stroke linear travel applications, sliding linear machines based on screw or belt drive The motion system has been difficult to meet the needs of practical applications. Linear motors can directly generate linear motion based on the working principle of traditional rotary motors. They are suitable for working conditions such as long strokes, high precision, high dynamic response, and long life. They have become more and more popular in the market in recent years.

At present, the mainstream solution of linear motor usually adopts permanent magnet linear motor. The working principle of the traditional permanent magnet linear motor is to place a permanent magnet on the stator, and place a coil winding on the mover. When a frequency converter or driver is used to pass three-phase or multi-phase alternating current to the coil winding, thrust is generated. At present, the permanent magnet linear motors produced by all manufacturers need to lay a large number of magnetic tracks made of permanent magnets with alternating N-S poles on the stator. This feature leads to the following five defects:

(1) The price is extremely expensive: Because the main components of permanent magnets are NdFeB or SmCo, which are rare earth materials, the cost is high and scarce, and the stator is covered with rare earth permanent magnets, which are extremely expensive when used in long-stroke applications.

(2) The additional cost of installation and transportation is high: the permanent magnet will generate a strong magnetic field around it, and a special magnetic isolation shield is required during the manufacturing process of the stator, which further increases the cost.

(3) The life of the motor is short: the strong magnetic field on the stator will attract iron filings and dust into the motor when the motor is running, affecting the life of the motor. Although some manufacturers will take measures to prevent dust, such as dust-proof measures such as shielding covers and organ covers, this will undoubtedly increase the cost of the motor.

(4) Generate electromagnetic interference: the permanent magnet on the stator will generate a strong magnetic field around it, which will interfere with the normal operation of surrounding electronic components, resulting in limited application in the field of precision detection in the 3C industry.

(5) High potential safety hazard: If the powerful permanent magnet is not properly operated during the handling, installation and use of the motor, it will cause injuries to workers.

In order to solve the above problems and take into account the respective advantages of the stator trackless linear motor and the traditional motor, the present invention designs a magnetism concentrating direct drive permanent magnet motor.

technical problem

technical solution

Aiming at the deficiencies in the prior art, the purpose of the present invention is to provide a magnetism-concentrating direct-drive permanent magnet motor, which includes two major components, the mover and the stator, and is characterized in that the mover includes a mover iron core, a winding, and The mover permanent magnet, in which the mover iron core is made of soft magnetic material, is composed of several mover teeth connected through the mover yoke, and no less than one set of mover magnetic gathering units are installed on the mover teeth. The magnetism gathering unit of the mover is located at the pole shoe of the mover teeth. Each magnet gather unit of the mover contains three permanent magnets of the mover and a soft magnetic material for fixing its installation position. The magnetization direction of the permanent magnets of the three movers In order to point to the center of the mover magnetic gathering unit or outward along the center of the mover magnetic gathering unit, the three mover permanent magnets are arranged in a C shape along the magnetization direction, and there is a soft space with a certain width between each mover permanent magnet. Magnetic materials, soft magnetic materials with a certain width are kept on both sides of each mover magnetic gathering unit, and there are magnetic isolation bridges between different magnetic gathering units in the same mover tooth. The stator includes the stator core and the stator permanent magnet. The stator The iron core is made of soft magnetic material. The stator has several stator teeth and stator slots arranged along the direction of motion. A set of stator magnetic gathering units are installed in each stator slot. Each stator magnetic gathering unit contains three stator permanent magnets. The magnetization direction of the stator permanent magnet is pointing to the center of the stator magnetic concentration unit or outward along the center of the stator magnetic concentration unit. The three stator permanent magnets are arranged in a C shape along the magnetization direction, and the spacing distance between the stator teeth follows The design principle is: when the stator teeth are aligned with the permanent magnets located in the middle of a certain magnetic concentration unit, the stator teeth on both sides of the stator teeth are aligned or approximately aligned with the soft magnetic materials on both sides of the magnetic concentration unit.

A complete magnetism-concentrating direct drive permanent magnet motor usually includes more than two working phases of the motor. Each working phase of the motor can be composed of one or more mover teeth connected by the mover yoke. Each mover tooth The separation distance along the moving directions can be a non-fixed value. The mover and the stator are assembled along the normal direction of the movement direction, and there is a certain air gap between them.

The present invention can also produce many types of variant motors. For example, the mover and stator are transformed into a closed structure along the circumferential direction, which can be used as a rotating permanent magnet motor, and all main features are retained. Motor stator and rotor. In addition, on the premise of retaining the main features, part of the permanent magnets can be appropriately omitted to reduce the cost. For example, if the lowermost permanent magnet in the stator magnetic concentration unit is omitted, the present invention still has a good magnetic concentration effect. Omitting the stator permanent magnet installed on the stator, the present invention can be transformed into a magnetic-concentration type non-magnetic track direct-drive permanent magnet motor. This type of motor has similar characteristics and advantages to the patent 201910292525X. It adopts a stator without a magnetic track structure and is low in cost. , but the present invention has a greater thrust density.

Beneficial effect

The present invention has the following beneficial effects:

1. The magnetic concentration effect is remarkable, the flux leakage coefficient is small, and the magnetic energy of the permanent magnet is fully utilized, thereby significantly increasing the thrust density and achieving high acceleration performance and strong load performance.

2. The structure is simple and easy to implement, and the installation of the permanent magnet is simple and reliable.

3. Only a small amount of permanent magnets are laid on the stator, or a stator without magnetic track structure with no permanent magnets at all is adopted, which is low in cost and convenient in transportation.

Description of drawings

The present invention will be described in detail below in conjunction with the accompanying drawings and a specific implementation example;

Fig. 1 is the concrete example schematic diagram of three kinds of linear direct drive permanent magnet motors of the present invention;

Fig. 2 is a schematic diagram of an example of a rotary direct drive permanent magnet motor designed based on the principles of the present invention;

Fig. 3 is a schematic diagram of different structural forms and magnetization directions of a mover magnetism gathering unit or a stator magnetism gathering unit of the present invention;

Fig. 4 is a schematic diagram of a plurality of magnetism gathering units contained in a single mover tooth of the present invention;

Fig. 5 is a schematic diagram of different design modes of the stator tooth structure (before installing the stator permanent magnet) according to the present invention.

Embodiments of the present invention

In order to make the technical means, creative features, goals and effects achieved by the present invention easy to understand, the present invention will be further described below in conjunction with a specific implementation example of the present invention.

A magnetism-concentrating direct-drive permanent magnet motor, comprising two major components of a mover and a stator, characterized in that the mover includes a mover iron core (1), a winding (2), and a mover permanent magnet (3), wherein The iron core of the mover is made of soft magnetic material, which is composed of several mover teeth (4) connected through the mover yoke (5). Two sets of mover magnetic gathering units (6) are installed on the mover teeth. The magnetism gathering unit is located at the pole shoe of the mover teeth, each mover magnet collection unit contains three mover permanent magnets and soft magnetic material for fixing its installation position, the magnetization direction of the three mover permanent magnets is Pointing to the center of the mover magnetization unit or outward along the center of the mover magnetization unit, the three mover permanent magnets are arranged in a C shape along the magnetization direction, and there is a soft magnetic field of a certain width between each mover permanent magnet. The two sides of each mover magnetic gathering unit have a certain width of soft magnetic material, and there is a magnetic isolation bridge (7) between different magnetic gathering units in the same mover tooth, and the stator includes a stator core (8) and The stator permanent magnet (9), the stator core is made of soft magnetic material, the stator has a number of stator teeth and stator slots arranged along the direction of motion, a group of stator magnetic gathering units are installed in each stator slot, and each stator magnetic gathering unit contains Three stator permanent magnets (9), the magnetization direction of the three stator permanent magnets is to point to the center of the stator magnetization unit or outward along the center of the stator magnetization unit, and the three stator permanent magnets are arranged in a C shape along the magnetization direction . The design principle for the spacing distance between the stator teeth is: when the stator teeth are aligned with the permanent magnets located in the middle of a certain magnetic concentration unit, the stator teeth on both sides of the stator teeth are aligned with the soft magnets on both sides of the magnetic concentration unit. The magnetic materials are aligned or approximately aligned. Two sets of mover magnetism gathering units are installed on the mover teeth in the above example, and when only one set of mover magnetism gatherers is installed on the mover teeth, the teeth do not contain a magnetic isolation bridge (7).

Described the basic principles and main features of the present invention and the advantages of the present invention. Those skilled in the art should understand that the present invention is not limited by the above-mentioned embodiments. The above-mentioned embodiments and descriptions only illustrate the principle of the present invention. In addition to the variant motor type, the present invention will have more changes and improvements, and these changes and improvements all fall within the scope of the claimed invention.

Claims

A magnetism-concentrating direct-drive permanent magnet motor, comprising two major components of a mover and a stator, characterized in that the mover includes a mover iron core (1), a winding (2), and a mover permanent magnet (3), wherein The iron core of the mover is made of soft magnetic material, which is composed of several mover teeth (4) connected by the mover yoke (5), and no less than one set of mover magnetic gathering units (6 ), the magnetic gathering unit of the mover is located at the pole shoe of the tooth of the mover, each magnetic gathering unit of the mover contains three permanent magnets of the mover and a soft magnetic material for fixing its installation position, the three permanent magnets of the mover The magnetization direction is pointing to the center of the mover magnetization unit or outward along the center of the mover magnetization unit. The three mover permanent magnets are arranged in a C shape along the magnetization direction, and there is a certain distance between each mover permanent magnet. The width of the soft magnetic material, the soft magnetic material of a certain width is kept on both sides of each mover magnetic gathering unit, and there is a magnetic isolation bridge (7) between different magnetic gathering units in the same mover tooth, and the stator includes the stator core (8) With the stator permanent magnet (9), the stator core is made of soft magnetic material. The stator has a number of stator teeth and stator slots arranged along the direction of motion. A group of stator magnetic gathering units are installed in each stator slot. Each stator The magnetic gathering unit includes three stator permanent magnets (9), the magnetization direction of the three stator permanent magnets is to point to the center of the stator magnetic gathering unit or outward along the center of the stator magnetic gathering unit, and the three stator permanent magnets are along the direction of magnetization Arranged in a C shape, the design principle for the spacing between the stator teeth is: when the stator teeth are aligned with the permanent magnets located in the middle of a certain magnetic concentration unit, the stator teeth on both sides of the stator teeth are aligned with the magnetic concentration unit. The soft magnetic materials on both sides of the cell are aligned or nearly aligned.
The magnetism-concentrating direct-drive permanent magnet motor according to claim 1, wherein each working phase of the motor can be composed of one or more mover teeth connected by mover yokes.
The magnetism-concentrating direct-drive permanent magnet motor according to claim 1, characterized in that the distance between the teeth of each mover along the moving direction can be a non-fixed value.
A magnetism-concentrating direct-drive permanent magnet motor according to claim 1, characterized in that the mover and the stator are transformed into a circumferentially closed structure, which can be used as a rotating permanent magnet motor, and all main features are retained. At this time The prime mover and stator become the stator and rotor of the rotating electrical machine respectively.
The magnet-concentrating direct-drive permanent magnet motor according to claim 1 is characterized in that the cost can be reduced by appropriately omitting some permanent magnets on the premise of retaining the main features.
The magnetism-concentrating direct-drive permanent magnet motor according to claim 1, characterized in that the shape of the stator teeth can be any regular or irregular shape, and can be a straight tooth structure or a helical tooth structure.