CN112803620A

CN112803620A - Magnetism-gathering type non-magnetic-track linear motor

Info

Publication number: CN112803620A
Application number: CN202110015735.1A
Authority: CN
Inventors: 顾聪; 盛田田; 张云龙; 石腾瑞
Original assignee: Suzhou Saideer Intelligent Technology Co ltd
Current assignee: Suzhou Saideer Intelligent Technology Co ltd
Priority date: 2021-01-07
Filing date: 2021-01-07
Publication date: 2021-05-14
Also published as: CN113054762B; CN113054762A; WO2022241980A1

Abstract

The invention discloses a magnetic-gathering non-magnetic-track linear motor which mainly structurally comprises a rotor and a stator. The invention is mainly characterized in that a plurality of permanent magnets in a rotor core are assembled in a specific designed installation mode and a specific magnetizing direction and in a specific relative position between the rotor and a stator, so that the plurality of permanent magnets have an obvious magnetism gathering effect, a high permanent magnet field utilization rate and a small magnetic leakage coefficient are obtained, and the thrust density is further increased remarkably. The invention relates to a magnetism-gathering type linear motor without magnetic tracks, which has the advantages of high thrust density, small thrust fluctuation, low cost, simplicity in processing and assembly, reliability in operation, easiness in multi-module expansion and the like.

Description

Magnetism-gathering type non-magnetic-track linear motor

Technical Field

The invention relates to the technical field of permanent magnet synchronous linear motors, in particular to a magnetism-gathering type magnetic-rail-free linear motor.

Background

In recent years, with the rapid development of high-end machine tools, 3C industries, laser cutting, liquid crystal panels and lithium battery industries, a sliding type linear motion system based on screw rod or belt transmission is difficult to meet the actual application requirements for application occasions of high speed, high precision and long-stroke linear travel. The linear motor can directly generate linear motion based on the working principle of the traditional rotating motor, is suitable for working conditions of long stroke, high precision, high dynamic response, long service life and the like, and is favored by the market in recent years.

At present, the mainstream scheme of the linear motor generally adopts a permanent magnet linear motor. The traditional permanent magnet linear motor has the working principle that a permanent magnet is placed on a stator, a coil winding is placed on a rotor, and when a frequency converter or a driver is adopted to introduce three-phase or multi-phase alternating current into the coil winding, thrust is generated. At present, permanent magnet linear motors produced by all manufacturers need to lay a magnetic track made of permanent magnets with alternating N-S poles on a stator, and the characteristic causes the following five defects:

(1) the price is extremely expensive: because the main components of the permanent magnet, namely rubidium, iron, boron or samarium cobalt, are rare earth materials, the cost is high and scarce, the rare earth permanent magnet is fully paved on the stator, and the price is extremely high when the permanent magnet is applied to a long-stroke field;

(2) the additional cost of installation and transportation is high: the permanent magnet can generate a strong magnetic field around, and a special magnetic isolation protective cover is needed in the manufacturing process of the stator, so that the cost is further increased;

(3) the service life of the motor is short: when the motor runs, the strong magnetic field on the stator can attract iron chips and dust to enter the motor, so that the service life of the motor is influenced. Although some manufacturers may adopt measures for dust prevention, such as adopting a shielding cover, an organ cover and other dust prevention measures, the cost of the motor is undoubtedly increased;

(4) electromagnetic interference is generated: the permanent magnet on the stator can generate a strong magnetic field around, and can interfere the normal operation of surrounding electronic components, so that the application of the permanent magnet in the precision detection field of the 3C industry is limited;

(5) the potential safety hazard is big: if improper operation, the powerful permanent magnet can lead to workman's injury in the transport of motor, installation and use.

In order to solve the above problems, patent 201910292525X reports a non-magnetic track type linear motor, which has the significant advantages of stator without magnetic track, low cost, convenient installation, high reliability, etc. In order to further improve the thrust density of the type of linear motor without the magnetic track and reduce the thrust fluctuation, the invention designs the magnetic-gathering linear motor without the magnetic track.

Disclosure of Invention

Aiming at the defects in the prior art, the invention aims to provide a magnetic-gathering type linear motor without magnetic tracks, which comprises a rotor and a stator. The method is characterized in that: the rotor comprises rotor iron cores, windings and permanent magnets, wherein the rotor iron cores are made of soft magnetic materials and are formed by connecting a plurality of rotor tooth parts through rotor yoke parts, the spacing distance between each rotor tooth part along the motion direction is a fixed value or a non-fixed value, at least one group of magnetism gathering units are installed on the rotor tooth parts and are located at pole shoes of the rotor tooth parts, each magnetism gathering unit comprises three permanent magnets and soft magnetic materials used for fixing the installation positions of the three permanent magnets, and the magnetizing directions of the three permanent magnets are towards the center of the magnetism gathering unit or outwards along the center of the magnetism gathering unit. It can be seen that the three permanent magnets are magnetized towards the same direction or outwards from the same point, so that the three permanent magnets have a remarkable magnetism gathering effect, the magnetic leakage coefficient can be effectively reduced, and the utilization rate of the magnetic energy of the permanent magnets is improved. In addition, a soft magnetic material with a certain width is reserved between every two permanent magnets, and a soft magnetic material with a certain width is reserved on two sides of each magnetic gathering unit. And magnetic isolation bridges are designed among different magnetic gathering units in the same rotor tooth part so as to ensure that the different magnetic gathering units are not coupled with each other. The stator is made of soft magnetic materials, a plurality of stator teeth are arranged on the stator along the moving direction, and the spacing distance between the stator teeth follows the design principle that: when the stator teeth are aligned with the permanent magnets in the middle of a certain magnetism gathering 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 magnetism gathering unit. A complete magnetic gathering type linear motor without magnetic tracks generally includes more than two motor working phases, and each motor working phase may be composed of one or more rotor teeth connected by rotor yokes. The rotor and the stator are assembled along the normal direction of the motion direction, and a certain air gap is reserved between the rotor and the stator.

The invention has the following beneficial effects:

1. the magnetic flux concentration effect is obvious, the magnetic flux leakage coefficient is small, the magnetic energy of the permanent magnet is fully utilized, the thrust density is further improved obviously, and high acceleration performance and strong belt load performance can be realized;

2. the structure is simple, the realization is easy, and the permanent magnet is simple and reliable to install;

3. the stator is of a non-magnetic rail structure, so that the cost is low and the transportation is convenient.

Drawings

The invention is explained in detail below with reference to the drawing and a specific exemplary embodiment;

FIG. 1 is a schematic diagram of an embodiment of the present invention;

FIG. 2 is a schematic diagram of different structural forms and magnetizing directions of the magnetism gathering unit according to the present invention;

FIG. 3 is a schematic diagram of a single rotor tooth portion including a plurality of magnetic flux collecting units according to the present invention;

FIG. 4 is a schematic view of a stator tooth structure according to a different design of the present invention;

Detailed Description

In order to make the technical means, the original characteristics, the achieved purposes and the effects of the invention easy to understand, the invention is further described in combination with a specific implementation example of the invention.

Fig. 1 shows an exemplary schematic diagram of a magnetic-concentrating non-magnetic-track linear motor, which includes a rotor and a stator, wherein the rotor includes a rotor core (1), a winding (2), and a permanent magnet (3), and the rotor core is made of a soft magnetic material and implemented by using silicon steel sheets in this example. The rotor core in the present example is formed by 6 rotor teeth (4) connected by rotor yoke (5), wherein every two rotor teeth form one motor working phase, and 6 rotor teeth form one three-phase motor. Each rotor tooth part is provided with two groups of magnetism gathering units (6) which are positioned at pole shoes of the rotor tooth part, each magnetism gathering unit comprises three permanent magnets, and the magnetizing direction points to the center of the magnetism gathering unit. Rotor iron core materials with certain width are reserved between every two permanent magnets, rotor iron core materials with certain width are reserved on two sides of every magnetic gathering unit, and magnetic isolation bridges (7) are designed between different magnetic gathering units in the same rotor tooth part to ensure that different magnetic gathering units are not coupled with each other. The stator is also of soft magnetic material and has a number of stator teeth arranged in the direction of movement, in this example trapezoidal stator teeth. The spacing distance between the stator tooth parts is designed to align the stator teeth on two sides of the stator tooth with the soft magnetic material on two sides of the magnetism gathering unit when a certain stator tooth is aligned with the permanent magnet in the middle of a certain magnetism gathering unit.

The basic principles and main features of the present invention and the advantages of the present invention are described. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are described in the specification and illustrated only to illustrate the principle of the present invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the present invention, which fall within the scope of the invention as claimed.

Claims

1. The utility model provides a gather magnetism formula and do not have magnetic track linear electric motor, includes active cell and two major components of stator, its characterized in that: the rotor comprises a rotor iron core (1), a winding (2) and permanent magnets (3), wherein the rotor iron core is made of soft magnetic materials and is formed by connecting a plurality of rotor tooth parts (4) through a rotor yoke part (5), at least one group of magnetism gathering units (6) are installed on the rotor tooth parts, the magnetism gathering units are located at pole shoes of the rotor tooth parts, each magnetism gathering unit comprises three permanent magnets and soft magnetic materials used for fixing the installation position of the magnet gathering unit, the magnetizing directions of the three permanent magnets point to the center of the magnetism gathering unit or outwards along the center of the magnetism gathering unit, the three permanent magnets are arranged in a C shape along the magnetizing direction, the soft magnetic materials with certain width are reserved between the permanent magnets, the soft magnetic materials with certain width are reserved on two sides of each magnetism gathering unit, magnetic bridges (7) are arranged between different magnetism gathering units in the same rotor tooth part, the stator is made of the soft magnetic materials, a plurality of stator tooth parts (8) are arranged on the, the spacing distance between the stator teeth follows the design rule: when the stator teeth are aligned with the permanent magnets in the middle of a certain magnetism gathering 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 magnetism gathering unit.

2. A flux-concentrating track-free linear motor as claimed in claim 1 wherein each motor operating phase is formed by one or more rotor teeth connected by rotor yoke portions.

3. The concentrated flux type non-magnetic track linear motor according to claim 1, wherein a spacing distance between each mover tooth in a moving direction may be a non-fixed value.

4. The concentrated flux type non-magnetic track linear motor according to claim 1, wherein the shape of the tooth portion of the stator may be any regular or irregular shape, and may be a straight tooth structure or a skewed tooth structure.