CN102035274A - Radial-structure magnetized outer rotor double-salient motor - Google Patents

Abstract

The present invention provides a radial structure magnetized outer rotor double salient pole motor, which is characterized in that it includes a stator, a rotor, an air gap between the stator and rotor, and a rotating shaft; the stator includes: a stator permanent magnet bracket arranged around the rotating shaft, a surrounding The permanent magnet set on the stator permanent magnet bracket, the stator core set around the permanent magnet, the permanent magnet adopts radial magnetization or parallel magnetization, the stator core is composed of stator core components, and the stator core components With an air gap, the permanent magnets are in contact with the stator core assembly and the number of permanent magnets is the same as the number of stator core assemblies. The invention adopts a radial/parallel structure magnetized magnet as a magnetic source, has a simple motor manufacturing process, and has less magnetic flux leakage at the end, and can be widely used in fields such as wind power generation and automobile hubs.

Description

Radial structure magnetized outer rotor doubly salient pole motor

technical field

The invention relates to a double salient pole motor, in particular to a radial structure magnetized outer rotor double salient pole motor.

Background technique

Doubly salient permanent magnet motor (DSPM for short) is a new type of AC speed control system that appeared in the 1990s with the development of power electronics and microelectronics. It consists of four parts: doubly salient motor, power converter, position detector and controller. The main advantages are simple structure and flexible control. According to the placement of permanent magnets, it can be divided into stator permanent magnet type double salient pole motor and rotor permanent magnet type double salient pole motor. The stator permanent magnet type is divided into tangential structure and radial structure.

Since the external rotor motor has a larger moment of inertia than conventional motors, and the diameter of the armature iron core can be made larger, thereby improving the efficiency and output power of the motor under unstable loads. Therefore, external rotor motors have unique advantages in some occasions, such as wind power generation and automobile hubs. Therefore, it is the primary task for researchers in this field to propose new external rotor motors with less magnetic flux leakage, low loss, and high power density.

Accompanying drawing 1 shows a kind of three-phase outer rotor doubly salient pole permanent magnet brushless generator proposed in the published document of Chinese patent application number 200510094975.6, which has a stator 11, a rotor 12, a rotating shaft 13, an armature winding 14 and a permanent magnet 15. Accompanying drawing 2 shows a double salient pole permanent magnet wheel hub motor proposed by Chinese patent application number 200720050797.1, which has a stator 21, a rotor 22, a bracket 23, a shaft 24, a wheel hub 25 and a bearing 26. Accompanying drawing 3 further shows that this electric machine also has permanent magnet 27 and armature winding 28. Both of the above two permanent magnet motors adopt tangential magnetization. Although the air gap flux density has been improved, due to the serious magnetic flux leakage near the shaft of the tangential permanent magnet, the permanent magnet bracket should be made of non-magnetic material, which increases the motor manufacturing process and cost. Therefore, providing a new type of external rotor double salient pole motor with less magnetic flux leakage at the shaft, simple process and low manufacturing cost has become the primary problem to be solved at present.

Contents of the invention

The purpose of the present invention is to provide a radial structure magnetized outer rotor double salient pole motor with less magnetic flux leakage, high efficiency, low manufacturing cost and simple manufacturing process.

To achieve the above object, the present invention adopts the following technical solutions:

A radial structure magnetized outer rotor double salient pole motor, including a stator, a rotor, an air gap between the stator and rotor, and a rotating shaft; the stator includes: a stator permanent magnet support arranged around the rotating shaft, and a permanent magnet arranged around the stator permanent magnet support , the stator core set around the permanent magnet, the permanent magnet adopts radial magnetization or parallel magnetization, the stator core is composed of stator core components, there is an air gap between the stator core components, the permanent magnet and the stator The core assemblies are in contact and have the same number of permanent magnets as the stator core assemblies.

The iron cores of the stator and rotor are of salient pole alveolar structure, the stator teeth are wound with concentrated armature windings, the rotor has no windings, and the stator and rotor iron cores can be straight teeth or helical teeth.

The permanent magnet is one of radial magnetization and parallel magnetization.

The radial structure magnetized outer rotor doubly salient motor is a three-phase motor, and when it is a three-phase motor, it satisfies a 6K/4K structure, K is an integer, and K=1, 2, 3....

The number of permanent magnets is the same as the number of stator core components, and the stator core is composed of 2K identical core components, where K is an integer.

There is no winding on the rotor iron core of the rotor.

The stator core may have straight teeth or helical teeth, and the rotor core may have straight teeth or helical teeth.

The stator permanent magnet bracket is made of magnetically permeable material.

When it is a three-phase motor or a multi-phase motor, the number of stator poles Ns and the number of rotor teeth Nr of the radial structure magnetized outer rotor double salient pole motor satisfy:

Among them , m is the phase number of the motor, and K is a positive integer.

According to the needs of motor design and process, the air gap between stator core components can be filled with other non-magnetic materials or not.

Compared with the existing double salient pole motor, the radial structure magnetized outer rotor double salient pole motor of the present invention has the main technical characteristics and positive effects: the radial structure magnetized magnet is used as the magnetic source, the motor manufacturing process is simple, and the end Less flux leakage.

The implementation and advantages of the present invention will be further explained below in conjunction with the accompanying drawings.

Description of drawings

Accompanying drawing 1 is the structural representation of a kind of three-phase outer rotor doubly salient pole permanent magnet brushless generator in the prior art;

Accompanying drawing 2 is a structural schematic diagram of a doubly salient permanent magnet hub motor in the prior art;

Accompanying drawing 3 is another structural representation of accompanying drawing 2;

Accompanying drawing 4 is that a kind of permanent magnet of the present invention adopts the radial structure magnetization outer rotor double salient pole motor of radial magnetization mode;

Accompanying drawing 5 is a kind of permanent magnet of the present invention adopts the radial structure magnetization outer rotor double salient pole motor of parallel magnetization mode.

Explanation of reference symbols:

11,21 stator 12,22 rotor

13 shafts 14, 28 armature windings

15 permanent magnet 23 bracket

24 axles 25 hubs

26 bearings 27 permanent magnets

41,51 radial/parallel magnetized permanent magnet 42,52 shaft

43,53 Stator permanent magnet bracket 44,54 Stator core assembly

45,55 Stator salient poles 46,56 Air gap between stator core components

47,57 rotor core 48,58 rotor salient poles

49,59 Centralized armature windings.

Detailed ways

Since the structure of the radial structure magnetized outer rotor double salient pole motor with different phase numbers is similar, the following only takes the radial structure magnetized outer rotor double salient pole motor with the three-phase 24/16 structure shown in Figure 4 as an example. Specific embodiments of the present invention will be described.

Referring to Fig. 4 , a radial structure magnetized outer rotor double salient pole motor according to the present invention includes a stator, a rotor, an air gap between the stator and rotor, and a rotating shaft 42 . The stator includes: a stator permanent magnet bracket 43 arranged around the rotating shaft 42, a permanent magnet 41 arranged around the stator permanent magnet bracket 43, a stator core arranged around the permanent magnet 41, and the stator core is composed of a stator core assembly 44, There is an air gap 46 between the stator core components 44, the permanent magnet 41 is magnetized in a radial direction, and the rotor is arranged outside the stator. In addition, this radial structure magnetized outer rotor double salient pole motor may further include a rotor position sensor and other accessories.

The stator and rotor iron cores are salient pole alveolar structures, the stator teeth are wound with centralized armature windings 49, the rotor has no windings, and the stator and rotor iron cores can be straight teeth or helical teeth.

Described stator permanent magnet support 43 adopts magnetically conductive material, the present invention can be three-phase motor, also can be polyphase motor, three-phase motor is 6K/4K structure, K=1, 2, 3...Integers such as, permanent magnet 42 The number of blocks is the same as the number of stator core assemblies 44, and the stator core is composed of 2K identical stator core assemblies 44, and each stator core assembly 44 has three teeth, a total of 6K teeth are evenly distributed along the circumference, and the rotor 4K teeth. When K=1, it is a 6/4 structure, that is, the stator core has 6 teeth, and the rotor core has 4 teeth; when K=2, it is a 12/8 structure, that is, the stator core has 12 teeth, and the rotor core has 4 teeth. It is 8 teeth; The accompanying drawing of the present invention shows the situation when K=4, which is a 24/16 structure, the stator iron core is 24 teeth, and the rotor iron core 47 is 16 teeth.

 ，式中：Ns为定子极数，Nr为转子极数，m为相数，K为正整数。In addition to satisfying the above-mentioned relationship between the number of teeth of the stator and rotor, the double salient pole motor with radial structure magnetized outer rotor of the present invention also satisfies:

, where: Ns is the number of stator poles, Nr is the number of rotor poles, m is the number of phases, and K is a positive integer.

The stator permanent magnet support 43 is made of magnetically conductive material; according to the needs of motor design and process, the air gap 46 between stator components can be filled with other non-magnetically conductive materials flexibly. A centralized armature winding 49 is wound on the teeth of the stator core.

Accompanying drawing 5 is a kind of permanent magnet of the present invention adopts the radial structure magnetization outer rotor double salient pole motor of parallel magnetization mode, comprises stator, rotor, air gap between stator and rotor, rotating shaft 52 etc. The stator includes: a stator permanent magnet bracket 53 arranged around the rotating shaft 52, a permanent magnet 51 arranged around the stator permanent magnet bracket 53, a stator arranged around the permanent magnet 51 and a rotor arranged along the outer circumference of the stator, and the stator core is formed by the stator The iron core assembly 54 is composed of an air gap 56 between the stator iron core assemblies 54, and the rotor is arranged outside the stator. Its structure is basically the same as that of the embodiment shown in FIG. 4 , except that the permanent magnet 51 in this embodiment adopts a parallel magnetization method.

The radial structure magnetized outer rotor double salient pole motor of the present invention can be operated as a motor or as a generator, and can be widely used in fields such as wind power generation and automobile hubs.

Of course, the above are only specific application examples of the present invention, and do not constitute any limitation to the protection scope of the present invention. In addition to the above-mentioned embodiments, the present invention can also have other embodiments. All technical solutions formed by equivalent replacement or equivalent transformation fall within the scope of protection claimed by the present invention.

Claims (10)

1. radial structure external rotor double salient pole motor that magnetizes is characterized in that, comprises air gap and rotating shaft between stator, rotor, rotor; Described stator comprises: the stator permanent magnet body support frame that twisted rotary shaft is provided with, the permanent magnet that is provided with around the stator permanent magnet body support frame and the stator core that is provided with around permanent magnet, described stator core is made up of the stator core assembly, the stator core inter-module has air gap, and permanent magnet is identical with the stator core package count with contact of stator core assembly and permanent magnet number.

2. the radial structure according to claim 1 external rotor double salient pole motor that magnetizes, it is characterized in that stator-rotor iron core is salient pole Alveolus type structure, is wound with centralized armature winding on the stator tooth, do not have winding on the rotor, stator-rotor iron core all can be straight-tooth or helical teeth.

3. the radial structure according to claim 1 external rotor double salient pole motor that magnetizes is characterized in that, described permanent magnet is a kind of in radial magnetizing and the parallel magnetization.

4. the radial structure according to claim 1 external rotor double salient pole motor that magnetizes is characterized in that when satisfy the 6K/4K structure for three phase electric machine, K is an integer, K=1,2,3 ...

5. according to claim 1 or the 4 described radial structures external rotor double salient pole motor that magnetizes, it is characterized in that the piece number of described permanent magnet is identical with the stator core package count, stator core is made up of 2K identical core assembly, and K is an integer.

6. the radial structure according to claim 1 external rotor double salient pole motor that magnetizes is characterized in that not having winding on the rotor core of described rotor.

7. the radial structure according to claim 5 external rotor double salient pole motor that magnetizes is characterized in that described stator core maybe can be straight-tooth maybe can be helical teeth, and described rotor core maybe can be straight-tooth maybe can be helical teeth.

8. the radial structure according to claim 1 external rotor double salient pole motor that magnetizes is characterized in that, described stator permanent magnet body support frame adopts permeability magnetic material.

9. the radial structure according to claim 1 external rotor double salient pole motor that magnetizes is characterized in that, when being three phase electric machine or polyphase machine, and stator poles NsWith the rotor number of teeth NrSatisfy:

Wherein m is the number of phases of motor, and K is a positive integer.

10. the radial structure according to claim 1 external rotor double salient pole motor that magnetizes is characterized in that, can be filled with non-magnet material in the described stator core inter-module air gap and also can not fill.

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