CN108808900A

CN108808900A - A kind of switched reluctance machines

Info

Publication number: CN108808900A
Application number: CN201810648275.4A
Authority: CN
Inventors: 徐志浩
Original assignee: Huaibei Lead Motor Co Ltd
Current assignee: Huaibei Lead Motor Co Ltd
Priority date: 2018-06-22
Filing date: 2018-06-22
Publication date: 2018-11-13

Abstract

The invention discloses a kind of switched reluctance machines, by the change to rotor pole tooth tip radian, are formed between rotor and stator and can change air gap, to change motor inductances performance, increased starting torque, improve output torque, reduce torque pulsation.The present invention is due to using variable-air-gap structure, inner ring is stator, has 24 stator tooth poles, outer shroud is rotor, there are 18 rotor pole teeth, winding coil totally two ten four, including tetra- phase of A, B, C, D, often six windings are that tandem connects in phase, its single-phase torque capacity is not only larger, and torque capacity position is more suitable, and pulsing after superposition reduces, and output torque increases；Under state of starting operating, in single-phase excitation, since inductance performance curve changes, peak torque is improved 40%, rated speed operating mode, since air gap is variable, rotor degree of saturation reduces, and output average torque improves 1.4%, and torque pulsation reduces 38%.

Description

A kind of switched reluctance machines

Technical field

The present invention relates to a kind of motor more particularly to a kind of switched reluctance machines.

Background technology

Switched reluctance motor (SRM) used in switched reluctance motor speed control system is to realize that electromechanical energy turns in SRD The component and SRD that change are different from the outstanding feature of other electric motor drive systems.SRM systems double-salient-pole variable reluctance motor, The salient pole of its stator and rotor is overrided to form by oOrdinary silicon steel sheet.Rotor is wound with concentration both without winding or without permanent magnet in stator poles Winding, two windings diametrically link up, and referred to as " phase ", SR motor can be designed to a variety of different number of phases knots Structure, and there are many different collocation for the number of poles of stator and rotor.

The number of phases is more, step angle is small, advantageously reduces torque pulsation, but complicated, and main switching device is more, of high cost, Therefore, using it is more be four phases (8/6) structure and three-phase (12/8) structure.Switching magnetic-resistance electromagnetic torque and motor inductances relationship Closely, tooth interpolar air gap has a major impact motor inductances.Existing scheme is designed using fixed air gap mode, single-phase turn Square is more steady, but passes through multiphase poststack, and torque pulsation is more apparent.Also, noise is also larger in switching magnetic-resistance operational process.

Invention content

In order to solve the deficiencies in the prior art, the purpose of the present invention is to provide a kind of switched reluctance machines, lead to Raising motor performance is crossed, while reducing noise, solves the problems, such as that starting torque is small.

In order to achieve the above objectives, the technology used in the present invention means are：A kind of switched reluctance machines, by rotor pole The change of tooth tip radian forms alterable air gap between rotor and stator and has increased turn to change motor inductances performance Square improves output torque, reduces torque pulsation.

Further, the stator tooth extremely pole shoe formula pole tooth, the flat arc formula pole tooth that rotor tooth extremely makes air gap variable.

Further, the unilateral air gap of the rotor and stator is between 1.7~3mm, as rotor rotates, rotor pole The gas length of tooth and stator poles between cog constantly changes.

Further, the switched reluctance machines are hub-type external rotor electric machine, and inner ring is stator, and there are 24 to be determined Sub- tooth pole, outer shroud are rotor, there is 18 rotor pole teeth, winding coil totally two ten four, including tetra- phase of A, B, C, D, in every phase Six windings connect for tandem.

The beneficial effects of the invention are as follows：Due to using variable-air-gap structure, inner ring is stator, has 24 stator tooths Pole, outer shroud are rotor, there is 18 rotor pole teeth, winding coil totally two ten four, including tetra- phase of A, B, C, D, six in every phase Winding connects for tandem, and single-phase torque capacity is not only larger, but also torque capacity position is more suitable, the arteries and veins after superposition Dynamic to reduce, output torque increases；Under state of starting operating, in single-phase excitation, since inductance performance curve changes, by peak torque 40% is improved, rated speed operating mode, since air gap is variable, rotor degree of saturation reduces, and output average torque improves 1.4%, turns Square pulsation reduces 38%.

Description of the drawings

The invention will be further elaborated with reference to the accompanying drawings and examples.

Fig. 1 is the sectional view of switched reluctance machines of the present invention；

Fig. 2 is the pole shoe formula rotor pole toothing schematic diagram of the prior art；

Fig. 3 is the flat arc formula stator poles tooth schematic diagram of the present invention；

Fig. 4 is prior art figure compared with the inductance performance curve of the present invention；

Fig. 5 is the prior art and the present invention static torque angle displacement characteristic figure when being in just to start；

Fig. 6 is the dynamic torque figure of the prior art under rated speed；

Fig. 7 is the dynamic torque figure of the invention under rated speed.

Specific implementation mode

Embodiment 1

A kind of switched reluctance machines form between rotor and stator by the change to rotor pole tooth tip radian and can change gas Gap increases starting torque to change motor inductances performance, improves output torque, reduces torque pulsation.

Embodiment 2

As the concrete structure of embodiment 1, the stator tooth extremely pole shoe formula pole tooth, the flat arc that rotor tooth extremely makes air gap variable Formula pole tooth.

As shown in Figure 1, 2, 3, wherein Fig. 1 is hub-type external rotor electric machine, and interior annular is stator 1, and 20 are shared on stator 1 Four tooth poles, outer toroid are rotor 2, have 18 tooth poles on rotor 2.There are one windings 3 for 1 pole tooth of each stator, share two 14, single winding 3 is connected every three, and forms a phase, and winding is divided into tetra- phases of ABCD altogether, per phase there are six around Group.

It is existing equidistant structure in Fig. 2, air gap is generally fixed 3mm, and flat arc formula structure is used in Fig. 3, and air gap is One, than gap, has most strong point and most weakness.

Embodiment 3

As the concrete structure of embodiment 2, the unilateral air gap of the rotor and stator is between 1.7~3mm, as rotor turns Dynamic, rotor pole tooth and the gas length of stator poles between cog constantly change.

Air gap most weakness be 0.18mm, up to 0.37mm, rotor clockwise rotate when, air gap be 0.37mm when air gap compared with Greatly, inductance minimum value is relatively previous smaller, as rotor rotates, is air gap smallest point when reaching symmetric position, is at this time 0.18mm, Since total air gap area is identical, maximum induction value is almost identical compared with the prior art.Inductance characteristic figure in Fig. 4 and analysis Identical, a is the inductance curve of the prior art in figure, and b is the inductance curve of the present invention, it is seen that inductance curve of the present invention, minimum electricity Sensillary area is longer, and maximum induction value is constant, and maximum induction and minimum inductance ratio are big compared with traditional ratio, and slope bigger, performance is more It is good.

Embodiment 4

As the concrete structure of embodiment 1, the switched reluctance machines are hub-type external rotor electric machine, and inner ring is stator, is had 24 stator tooth poles, outer shroud are rotor, there is 18 rotor pole teeth, winding coil totally two ten four, including A, B, C, D tetra- Phase, often six windings are that tandem connects in phase.

As shown in figure 5, in when just starting, traditional structure and structure of the invention static state torque angle displacement characteristic figure, wherein a are to pass System performance plot, b are new structure performance plot, its static characteristic is detected after injecting 10A direct currents to single-phase winding, from square angle spy Property figure can be seen that after flat arc structure, which is 3Nm, conventional peak only has 2Nm, and characteristic improves More than 40%, torque angle displacement characteristic improves, and can further increase electric motor starting torque, improves motor performance.

Fig. 6 is the dynamic torque of traditional structure under rated speed, and Fig. 7 is the dynamic torque of structure of the invention.It can be seen that Under rated speed, structure of the invention output torque is 6.8Nm, improves 1.4% than traditional performance, while its torque pulsation only has 7.4Nm, pulsation reduce, and 38% is improved than traditional performance, not only reduce fuselage vibrations and also reduce noise.

From above-mentioned analysis result, using the switched reluctance machines of rotor structure disclosed by the invention, in perfect condition Under, from static state to dynamic, performance is risen motor.For the angle of energy, this structure is by partial magnetic field ability It is stored among air gap, orderly guiding magnetic circuit trend, to reduce fringe magnetic leakage phenomenon.

One of ordinary skill in the art will appreciate that：The above embodiments are only used to illustrate the technical solution of the present invention., and It is non-that it is limited；Although present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art It should be understood that：Its still can with technical scheme described in the above embodiments is modified, either to which part or All technical features carries out equivalent replacement；And these modifications or replacements, it does not separate the essence of the corresponding technical solution this hair The range of bright each embodiment technical solution.

Claims

1. a kind of switched reluctance machines, it is characterised in that：By the change to rotor pole tooth tip radian, between rotor and stator It is formed and can change air gap, to change motor inductances performance, increased starting torque, improve output torque, reduce torque pulsation.

2. switched reluctance machines according to claim 1, it is characterised in that：The stator tooth extremely pole shoe formula pole tooth turns The flat arc formula pole tooth that sub- tooth extremely makes air gap variable.

3. switched reluctance machines according to claim 2, it is characterised in that：The unilateral air gap of the rotor and stator exists Between 1.7~3mm, as rotor rotates, rotor pole tooth and the gas length of stator poles between cog constantly change.

4. switched reluctance machines according to claim 3, it is characterised in that：The switched reluctance machines are to turn outside hub-type Sub-motor, inner ring are stator, have 24 stator tooth poles, outer shroud is rotor, has 18 rotor pole teeth, winding coil total 24, including tetra- phase of A, B, C, D, often six windings are that tandem connects in phase.