CN103066719A

CN103066719A - Magnetic gathering type stator permanent magnetic type vernier motor

Info

Publication number: CN103066719A
Application number: CN2012105394142A
Authority: CN
Inventors: 吉敬华; 赵文祥; 赵建兴; 朱纪洪
Original assignee: Jiangsu University
Current assignee: Changshu Huasen Textile Co.,Ltd.
Priority date: 2012-12-14
Filing date: 2012-12-14
Publication date: 2013-04-24
Anticipated expiration: 2032-12-14
Also published as: CN103066719B

Abstract

The invention discloses a magnetic gathering type stator permanent magnetic type vernier motor. A rotor is located on the outer portion of a stator and an air gap is arranged between the rotor and the stator. A plurality of stator teeth and a plurality of stator grooves are arranged at one end of the stator and the end of the stator is close to the air gap. Virtual teeth and virtual grooves are arranged at a tooth end of each stator tooth, the virtual teeth are arranged at two ends of the tooth end of the stator tooth along the circumference direction, and the number of the virtual teeth is one more than the number of the virtual groove. A permanent magnet unit which is composed of a radial magnetizing permanent magnet and two tangential magnetizing permanent magnets is embedded in each virtual groove, both two sides of the radial magnetizing permanent magnet are tightly pasted with tangential magnetizing permanent magnets, the magnetizing directions of the two tangential magnetizing permanent magnets which are arranged in the virtual groove are opposite to each other, and magnetism of each radial magnetizing permanent magnet is consistent. Due to the adoption of the virtual teeth, use level of the permanent magnets is reduced and cost is reduced. Due to the fact that permanent magnets matches with each other, leakage magnetic flux of teeth portions is effectively reduced and output torque and power density are improved.

Description

A kind of magneticfocusing stator permanent magnetic type vernier motor

Technical field

The present invention relates to a kind of motor or generator of high power density, belong to the magneto field.

Background technology

Vernier motor has the characteristics of low speed high torque, therefore has preferably application such as fields such as track traffic, Ship Propeling, food processing and electric automobiles.Because rotor permanent magnet type motor is that permanent magnet is placed on the rotor, this brings certain difficulty for the cooling of motor, and excess Temperature can affect the stable operation of motor, particularly surpasses the Curie temperature of permanent magnet when temperature, then can cause the permanent loss of excitation of permanent magnet, so that the motor operation troubles.Stator permanent magnetic type electric is that permanent magnet is placed on the stator, rotor without winding also without permanent magnet, simple in structure, can effectively reduce the temperature rise of winding and permanent magnet by stator casing cavity water-cooled, improve power of motor density.

Document IEEE TRANSACTIONS ON MAGNETICS, 47 (10): 4219-4222,2011(Design and Analysis of Linear Stator Permanent Magnet Vernier Machines) introduced a kind of orthoscopic stator permanent magnetic type vernier motor, permanent magnet is placed the stator increment, but this stator permanent magnetic type vernier motor is at the stator increment, there is comparatively serious leakage field in rotor increment and the air gap, had a strong impact on the useful flux contact area of motor, so that close the reducing of motor effective air gap magnetic, the back-emf that causes responding in the winding reduces greatly, thereby power density with compare lowly with the rotor permanent magnet type motor of volume, the motor utilance is low.

Summary of the invention

The problem that the objective of the invention is that leakage field in the existing stator permanent magnetic type vernier motor is serious in order to solve, back-emf is less, the permanent magnet consumption is excessive in close less, the stator winding of magnetic in the air gap and propose a kind of magneticfocusing stator permanent magnetic type vernier motor.

The technical solution used in the present invention is: rotor is positioned at the stator outside, has air gap between rotor and the stator, stator has stator tooth and stator slot at the end near air gap, each stator tooth increment has empty tooth and empty groove, each stator tooth increment two ends in the circumferential direction of the circle is empty tooth, and virtual number of teeth is Duoed one than empty groove number; An empty groove is embedded with one by a radial magnetizing permanent magnetism body and two permanent magnet units that the cutting orientation magnetizing permanent magnet consists of, a cutting orientation magnetizing permanent magnet is all closely pasted in the both sides of radial magnetizing permanent magnetism body, the magnetizing direction of two cutting orientation magnetizing permanent magnets in empty groove is relative, and the polarity of each radial magnetizing permanent magnetism body is consistent.

Therefore the present invention can reduce the consumption of permanent magnet owing to being provided with empty tooth, thereby reduces the manufacturing cost of motor; Magnetic flux among the present invention is mainly provided by the permanent magnet of radial magnetizing, and the magnetic line of force is got back to the loop that forms closure in the permanent magnet from permanent magnet by air gap, rotor tooth, air gap; By cooperatively interacting between the permanent magnet, can effectively reduce tooth section leakage flux, the magnetic that effectively increases in the magnetic circuit is close, improves air gap flux density, so back-emf can Effective Raise in the winding, improves output torque and power density.Electric machine structure of the present invention not only can be used as electric rotating machine, can be suitable for too linear electric motors.

Description of drawings

Below only in conjunction with the drawings and specific embodiments of five-phase induction motor the present invention is described:

Fig. 1 is the radial structure schematic diagram of the present invention's five phase magneticfocusing stator permanent magnetic type vernier motors;

Fig. 2 is the expansion enlarged drawing of Fig. 1 rotor 2 structures;

Fig. 3 is the partial structurtes enlarged drawing of stator 1 among Fig. 1;

Fig. 4 is the structure enlarged drawing of a stator tooth 12 among Fig. 1;

Fig. 5 is that traditional five phase stator permanent magnetic type vernier motors and motor winding of the present invention are counter potential waveform contrast schematic diagram when concentrating winding;

Fig. 6 is traditional five phase stator permanent magnetic type vernier motors and motor winding of the present invention counter potential waveform contrast schematic diagram when being distributed winding;

Fig. 7 is that motor winding of the present invention is counter potential waveform contrast schematic diagram when concentrating winding with distributed winding;

Fig. 8 is that motor A phase winding of the present invention is for concentrating the connected mode of winding;

Fig. 9 is that motor A phase winding of the present invention is the connected mode of distributed winding;

Figure 10 is the close figure of traditional five phase stator permanent magnetic type vernier motor part magnetic;

Figure 11 is the close figure of motor part magnetic of the present invention;

Among the figure: 1. stator; 2. rotor; 12. stator tooth; 14. stator slot; 19. groove; 21. rotor tooth; 22. rotor yoke; 31,32,33. permanent magnets; 101. empty groove; 102. empty tooth; 300. permanent magnet unit.

Embodiment

Referring to Fig. 1, the present invention comprises coaxial stator 1 and rotor 2, and rotor 2 is positioned at stator 1 outside.There is fluting 19 at the center of stator 1, is used for laying rotating shaft.Have air gap between rotor 2 and the stator 1, the thickness of air gap is according to motor size and require institute to get.Stator 1 is comprised of stator tooth 12 and stator slot 14, and stator slot 14 is used for placing winding, the increment mosaic magnet unit 300 of stator tooth 12.

Concrete structure and the proportionate relationship of rotor 2 are seen Fig. 2, and rotor 2 is comprised of rotor tooth 21 and rotor yoke 22, and the tooth depth of rotor tooth 21 and rotor yoke 22 can be optimized as required.Rotor tooth 21 is trapezium structure in the face of an end of air gap, and rotor tooth 21 is near the facewidth of air gap side S ₁Tooth pitch with rotor tooth 21 T _pThe ratio K ₁Satisfy following relational expression: K ₁( S ₁ / T _p)=0.2 ~ 0.5; Rotor tooth 21 is near the facewidth of air gap side S ₁With the facewidth of rotor tooth 21 near rotor yoke 22 S ₂Ratio satisfy following relational expression: K ₂( S ₁ / S ₂)=0.1 ~ 0.9, concrete size is determined by motor itself; Rotor tooth 21 is processed by silicon steel plate stacking or permeability magnetic material with the material of rotor yoke 22.）

See shown in Fig. 1,3,4, embedded permanent magnet unit 300 in the increment of stator 1 fluting, permanent magnet unit 300 is made of three

permanent magnets

31,32,33.Stator 1 is at also slot near an end of air gap formation tooth slot structure, i.e. stator tooth 12 and stator slot 14.Stator slot 14 can adopt various grooveds, chooses according to concrete needs.Stator tooth 12 principal characters concentrate on its increment.See Fig. 3, the number of teeth of establishing motor is N, N=1,2,3...... n, along fluting, form empty tooth 102 and empty groove 101, virtual number of teeth at the increment of each stator tooth 12

Figure 2012105394142100002DEST_PATH_IMAGE001

Than empty groove number

Many one, namely

=

+ 1, each stator tooth 12 increments two ends in the circumferential direction of the circle is empty tooth 102.The radian of each empty groove 101 is

, the radian of each empty tooth 102 is

, empty groove 101 with empty tooth 102 shared radians is K, K(

/

)=0.8 ~ 1.1.

101 li of empty grooves are embedded with a permanent magnet unit 300, and as shown in Figure 4, permanent magnet unit 300 is made of a radial magnetizing permanent magnetism body 32 and two cutting orientation magnetizing permanent magnets 31,33.The volume of radial magnetizing permanent magnetism body 32 is greater than single cutting orientation magnetizing

permanent magnet

31,33 volume, radial magnetizing permanent magnetism body 32 is positioned at the centre of empty groove 101, a cutting orientation magnetizing

permanent magnet

31,33 is all closely pasted respectively in the both sides of radial magnetizing permanent magnetism body 32, two cutting orientation magnetizing permanent magnets 31 that empty groove is 101 li, 33 magnetizing direction are relative, and the polarity of each radial magnetizing permanent magnetism body 32 is consistent.Magnetizing direction is seen shown in the arrow on Fig. 4.Cutting orientation magnetizing

permanent magnet

31,33 magnet accumulating caps.

Each

permanent magnet

31,32,33 height along radial direction equate.The percentage that radial magnetizing permanent magnetism body 32 shared radians account for the shared radian of whole permanent magnet unit 300 is

,

=0.6 ~ 0.9.The percentage that single cutting orientation magnetizing

permanent magnet

31 or 33 shared radians account for the shared radian of whole permanent magnet unit 300 is

,

=0.05 ~ 0.2.

Magnetic flux is mainly provided by radial magnetizing permanent magnetism body 32, and the magnetic line of force by air gap, over against rotor tooth 21, is got back to the loop that forms closure the permanent magnet unit 300 from other rotor tooth 21 through air gap from the permanent magnet unit 300s; Cutting orientation magnetizing

permanent magnet

31,33 works to reduce leakage field.

Permanent magnet unit 300 produces the number of pole-pairs of Distribution of Magnetic Field pWith radial magnetizing permanent magnetism body 32 numbers

With rotor tooth 21 numbers Cooperate relevantly, the difference of the absolute value of the two is exactly the number of pole-pairs of Distribution of Magnetic Field p, be formulated and be exactly:

If radial magnetizing permanent magnetism body 32 numbers Be 50, rotor tooth 21 numbers

Be 59, the number of pole-pairs p in permanent magnet generation magnetic field is exactly 9 so; If

Remain unchanged rotor tooth 21 numbers

Be 41, the number of pole-pairs p that permanent magnet produces magnetic field also is 9.

Motor of the present invention can be designed to single-phase or polyphase machine as required, every phase winding can adopt to be concentrated or distributed winding, what it may be noted that is exactly: if do not change other condition, only change the connected mode of winding, the back electromotive force that distributed winding produces will be far longer than concentrated winding.In addition, for distributed winding, number of pole-pairs is more, and the back electromotive force of responding in the winding is less.And concentrate winding to this in confused situation aobvious.

Fig. 5 is that the winding of traditional five phase stator permanent magnet vernier motors (A1 wavy line) and motor of the present invention (A2 wavy line) is the counter potential waveform figure when concentrating winding.Can see when same size, traditional five phase stator permanent magnetic type vernier motor back-emf amplitudes are about 60V, and the back-emf amplitude of motor of the present invention surpasses 130V.

Fig. 6 is the counter potential waveform figure of the winding of traditional five phase stator permanent magnet vernier motors (A wavy line) and motor of the present invention (B wavy line) when being distributed winding, in the situation that keep all the other parameter constants, the back-emf amplitude that can see tradition five mutually common stator permanent magnet vernier motors is about 240V, and the back-emf amplitude of motor of the present invention can surpass 500V.

Fig. 7 is that the winding of motor of the present invention is that distributed winding (B1 wavy line) is followed the counter potential waveform figure when concentrating winding (B2 wavy line), can see its other condition that do not change, only change winding connection, the back-emf of distributed winding will be much larger than concentrated winding.

Fig. 8, Fig. 9 are that motor A phase winding of the present invention is for concentrating the connected mode of winding and distributed winding.A+ represent into, A-expresses.51,52,54,55 represent respectively the end winding.Contrasting the magnetic line of force 41 of Figure 10 and the magnetic line of force 42 of Figure 11 can see, motor of the present invention can effectively reduce leakage field, increases the power density of motor.

Claims

1. magneticfocusing stator permanent magnetic type vernier motor, rotor (2) is positioned at stator (1) outside, has air gap between rotor (2) and the stator (1), it is characterized in that: stator (1) has stator tooth (12) and stator slot (14) at the end near air gap, each stator tooth (12) increment has empty tooth (102) and empty groove (101), each stator tooth (12) increment two ends in the circumferential direction of the circle are empty tooth (102), and virtual number of teeth is Duoed one than empty groove number; An empty groove (101) is embedded with a permanent magnet unit (300) that is made of a radial magnetizing permanent magnetism body (32) and two cutting orientation magnetizing permanent magnets (31,33), the both sides of radial magnetizing permanent magnetism body (32) all fit tightly a cutting orientation magnetizing permanent magnet (31,33), the magnetizing direction of two cutting orientation magnetizing permanent magnets (31,33) that an empty groove (101) is inner is relative, and the polarity of each radial magnetizing permanent magnetism body (32) is consistent.

2. a kind of magneticfocusing stator permanent magnetic type vernier motor according to claim 1, it is characterized in that: the ratio that the shared radian of radial magnetizing permanent magnetism body (32) accounts for the shared radian of permanent magnet unit (300) is 0.6 ~ 0.9, and the ratio that the shared radian of single cutting orientation magnetizing permanent magnet (31,33) accounts for the shared radian of permanent magnet unit (300) is 0.05 ~ 0.2.

3. a kind of magneticfocusing stator permanent magnetic type vernier motor according to claim 1, it is characterized in that: the ratio of the shared radian of empty groove (101) and the shared radian of empty tooth (102) is 0.8 ~ 1.1.

4. a kind of magneticfocusing stator permanent magnetic type vernier motor according to claim 1 is characterized in that: each described permanent magnet height radially all equates.

5. a kind of magneticfocusing stator permanent magnetic type vernier motor according to claim 1, it is characterized in that: rotor (2) is comprised of rotor tooth (21) and rotor yoke (22), rotor tooth (21) is trapezium structure in the face of an end of air gap, the ratio of the facewidth of the close air gap side of rotor tooth (21) and the tooth pitch of rotor tooth (21) is 0.2 ~ 0.5, and the facewidth of the close air gap side of rotor tooth (21) and rotor tooth (21) are 0.1 ~ 0.9 near the ratio of the facewidth of rotor yoke (22).