CN104967275A - A doubly salient permanent magnet linear motor and a motor module composed of it - Google Patents

Abstract

The invention relates to an internal heat radiation composite magnetic flux switching permanent magnet motor including two stators, two rotors, armature windings, permanent magnets, a magnet insulation ring, and radiating holes. In one aspect, internal and external rotors don't have permanent magnets and any excitation windings, so that the motor has the characteristic of firm structure; and in another aspect, the two rotors are provided with the permanent magnets and the armature windings and are connected through the magnet insulation ring, and the heat of the motor can be radiated from the inside through the radiating holes. A permanent magnet magnetic flux switching motor is kept in structure, the advantages of good robustness and high speed running can be achieved. The heat radiation of the side of the motor can be realized without additionally increasing the size of the motor, so that the motor can be high in reliability and good in overloading capability, and is suitable for the conditions requiring small size and high reliability and having bad heat radiation.

Description

A doubly salient permanent magnet linear motor and a motor module composed of it

technical field

The present invention relates to the technical field of motor manufacturing, and in particular to double salient pole permanent magnet linear motors.

Background technique

The motor is the main part of the transmission system. It is very important to select the appropriate motor type according to different applications to improve the performance and efficiency of the entire system. In linear drive applications, traditional rotary motors require a certain intermediate conversion device to convert rotary motion into linear motion. This brings many problems, for example, the system is bulky, the weight is increased, the noise is high, the maintenance cost is increased, and the reliability is reduced. In rail transit applications, if the rotating motor is used, the vehicle speed is too high and there will be problems such as wheel-rail slippage. . Therefore, the technical means of replacing the rotary motor with a linear motor can overcome the above-mentioned shortcomings of the rotary motor in such high-speed applications and improve the efficiency of the entire system.

China is a big country of rare earths. With the development of power electronics technology and magnetic materials, rotating permanent magnet motors have developed rapidly. This type of motor has the advantages of high efficiency, high power density, and easy control. Its corresponding rectilinear structure has also been extensively studied. The traditional permanent magnet linear synchronous motor has the dual advantages of permanent magnet motor and linear motor. Compared with linear induction motors, permanent magnet linear synchronous motors have high efficiency, high power factor, light weight, and have a dynamic braking function. However, since the permanent magnets and armature windings of traditional permanent magnet motors are installed in the primary and secondary respectively, and the cost of both permanent magnets and armatures is high, it will undoubtedly lead to increased system costs in long stator applications such as rail transit .

At present, mover permanent magnet linear motors are represented by doubly salient permanent magnet motors and flux switching permanent magnet motors. This type of motor has a high power density, and its permanent magnets and armature windings are placed on the mover. , the stator is only made of magnetically conductive core material, which has the advantages of high power density, simple structure, easy heat dissipation, and high reliability. Most of the existing mover permanent magnet linear motors have a single stator structure, and the permanent magnet on the mover has serious flux leakage, which weakens the output capacity of the motor.

Contents of the invention

In view of this, the purpose of the present invention is to provide a doubly salient permanent magnet linear motor and a motor module composed of it, which has the advantages of simple and reliable structure, large thrust, small thrust fluctuation, and high efficiency.

The invention discloses a double salient pole type permanent magnet linear motor and a motor module composed of it. The double salient pole permanent magnet linear motor includes a mover and a stator, both of which are salient pole structures with an air gap between them. It is characterized in that the upper and lower stators are staggered by the displacement of half the stator pole pitch ( τ _s /2). There are neither permanent magnets nor armature windings on the stator, it is only made of magnetically permeable material. The mover includes 2 mover modules. The relative displacement between the two mover modules is λ =(n±1/2) τ _s , where n is a positive integer. The mover module consists of iron core, permanent magnet and armature winding. A permanent magnet is clamped between the iron cores in the mover module. The magnetization direction of the permanent magnet is perpendicular to the movement plane of the mover. The magnetization directions of the permanent magnets in adjacent mover modules are opposite. The armature winding is a concentrated winding, which covers the salient pole teeth on the iron core.

In the present invention, the doubly salient permanent magnet linear motor may be a motor or a generator.

The present invention also proposes a motor module composed of the above-mentioned doubly salient permanent magnet linear motors, characterized in that k doubly salient permanent magnet linear motors are connected in series to form a whole or separately controlled separately.

In summary, the structural characteristics of the present invention lead to the advantages of simple and reliable structure, large thrust, small thrust fluctuation, and high efficiency. The present invention is particularly suitable for applications requiring large thrust and long stator structure linear motors, such as linear drive applications such as urban rail transit, factory transportation transmission equipment, and elevators in high-rise buildings.

Description of drawings

FIG. 1 is a schematic structural view of a doubly salient permanent magnet linear motor of the present invention.

Among them, 1-mover, 2-stator, 3-iron core, 4-permanent magnet, 5-armature winding, 10-mover module.

Detailed ways

In order to illustrate the structural features and operating principles of the present invention, a three-phase motor is taken as an example below.

As shown in Figure 1, the doubly salient pole permanent magnet linear motor ( τ _m =8/12* τ _s ) provided by the present invention includes a mover 1 and a stator 2, both of which are convex polar structure with an air gap between them. There are neither permanent magnets nor armature windings on the stator 2, but are only composed of magnetically permeable materials. The upper and lower stators 2 are staggered by the displacement of half the stator pitch ( τ _s /2). The mover 1 includes two mover modules 10. The relative displacement between the two mover modules 10 is λ = 2.5* τ _s . The mover module 10 includes an iron core 3 , a permanent magnet 4 and an armature winding 5 . A permanent magnet 4 is sandwiched between the iron cores 3 of the mover module 10 . The magnetization direction of the permanent magnet 4 is perpendicular to the moving plane of the mover 1 . The magnetization directions of the permanent magnets 4 in adjacent mover modules 10 are opposite. The armature winding 5 is a concentrated winding and covers the salient pole teeth of the iron core 3 . In this embodiment, the width of the permanent magnet 4 is equal to that of the iron core 3 of the mover module.

In the embodiment shown in FIG. 1 , each mover module 10 has upper and lower armature windings 5 . The positive and negative polarities of the upper and lower windings belonging to the same phase are opposite. In the embodiment, the windings A1, A2, A3, and A4 are connected in series to form the A-phase winding, the windings B1, B2, B3, and B4 are connected in series to form the B-phase winding, and the windings C1, C2, C3, and C4 are connected in series to form the C-phase winding.

The specific implementation cases described in the present invention are only preferred implementation cases of the present invention, and are not intended to limit the implementation scope of the present invention. That is, all equivalent changes and modifications made according to the content of the patent scope of the present invention shall be regarded as the technical scope of the present invention.

Claims (6)

1. a double-salient-pole formula permanent-magnetism linear motor, comprises mover and stator, and described mover and stator are salient-pole structure, and have air gap between the two, it is characterized in that: stator is that permeability magnetic material is formed, and upper and lower two stators stagger half stator poles distance mutually τ _s displacement, mover comprises 2 mover modules, and the relative displacement between 2 mover modules is λ=(n ± 1/2) τ _s , n is positive integer, and mover module is by iron core, and permanent magnet and armature winding are formed.

2. double-salient-pole formula permanent-magnetism linear motor according to claim 1, is characterized in that: accompany permanent magnet between iron core in mover module, and permanent magnet magnetizing direction is perpendicular to mover plane of movement, and in adjacent mover module, permanent magnet magnetizing direction is contrary.

3. double-salient-pole formula permanent-magnetism linear motor according to claim 1, it is characterized in that: armature winding is concentratred winding, armature winding entangles the salient pole tooth on iron core.

4. double-salient-pole formula permanent-magnetism linear motor according to claim 1, is characterized in that: described double-salient-pole formula permanent-magnetism linear motor is motor or generator.

5. the motor module be made up of the double-salient-pole formula permanent-magnetism linear motor described in claim 1 ~ 4, is characterized in that: include k described double-salient-pole formula permanent-magnetism linear motor, k is positive integer.

6. motor module according to claim 5, is characterized in that: a k described double-salient-pole formula permanent-magnetism linear motor entirety in series or separately control separately.