CN103647421A - High slot-fill factor high-performance permanent magnet motor with open slots and straight teeth - Google Patents
High slot-fill factor high-performance permanent magnet motor with open slots and straight teeth Download PDFInfo
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- CN103647421A CN103647421A CN201310581479.8A CN201310581479A CN103647421A CN 103647421 A CN103647421 A CN 103647421A CN 201310581479 A CN201310581479 A CN 201310581479A CN 103647421 A CN103647421 A CN 103647421A
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Abstract
The invention discloses a high slot-fill factor high-performance permanent magnet motor with open slots and straight teeth, the motor including a stator and a rotor. The stator includes a stator core and stator windings. Stator teeth are made into straight teeth with equal tooth width and can be used for improving the slot-fill factor. As for the stator windings, single layer concentrated windings are employed, and each slot is wound by a winding. The rotor is composed of permanent magnets and a rotating shaft, and an air gap exists between the stator and the rotor. The permanent magnets are composed of permanent magnets arranged in a Halbach array, and are divided into radial permanent magnets and tangential permanent magnets according to different magnetizing directions, and each permanent magnet is of fan-shaped structure. The fan-shaped permanent magnets are arranged in an actinoid manner around an axial lead. The Halbach-type permanent magnet array can improve power density and reduce torque ripple. The motor provided by the invention is simple in structure, high in slot-fill factor, high in no-load back EMF sinusoidal degree, small in torque ripple and high in mechanical robustness, and is conducive to reducing positioning torque of the motor. In addition, physical isolation, thermal isolation and decoupling of a magnetic circuit are arranged between phases of the motor.
Description
Technical field
The present invention relates to a kind of high copper factor high-performance open slot straight-tooth permagnetic synchronous motor, can be used for Aero-Space etc. to power of motor density and the higher field of reliability requirement.
Background technology
In recent years, along with developing rapidly of rare earth permanent-magnetic material, particularly rubidium iron B permanent magnetic material performance improve constantly the reduction gradually with price, magneto obtains application more and more widely at aspects such as national defence, industrial and agricultural production and household electrical appliance.At some special dimensions, as requiring motor, Aero-Space, electric automobile etc. there is high power density and efficiency.And copper factor is the technical bottleneck that electric efficiency and power density improve.
General permagnetic synchronous motor often adopts distributed winding, and grooved is mostly semi-open slot.Its winding normally winds in rear embedding stator slot in vitro, because notch is narrow more a lot of than groove body, cause copper factor to be conventionally no more than 50%, and winding overhang stretch out longer, electric machine structure is not compact, is difficult to meet the special application field that power density is had higher requirements.In order to improve the current normal means that adopt of copper factor, be that stator is divided into a plurality of stator segment assemblies, each stator segment assemblies generally includes a stator tooth, and stator tooth is assembled after winding winding.Although the method can improve copper factor,, the assembling of segmented stator is applicable to low speed heavy-duty motor conventionally, and the silicon steel sheet that is used for forming stator should not be too thin, otherwise interlaced, is not easy to assembling.
Though general permagnetic synchronous motor has high power density on the other hand, but due to its intrinsic location torque, affected it and at high-precision servo, driven the application in field, conventional solution is to adopt the methods such as slotless or skewed slot.It is lower slightly that but slotless configuration is only suitable in low-power machine and efficiency; Though and skewed slot can reduce torque pulsation, also sacrificed power simultaneously.
Summary of the invention
For the deficiency existing in prior art, the object of the present invention is to provide a kind of compact conformation, copper factor is high, and back-emf is sinusoidal, the high-performance motor that torque pulsation is little.Make motor be convenient to rule, and winding overhang stretch out short, compact conformation, power density is high.
To achieve these goals, the present invention realizes by the following technical solutions:
Permagnetic synchronous motor of the present invention comprises stator, rotor, and stator consists of stator core and stator winding, and rotor consists of permanent magnet and rotating shaft, between stator and rotor, has air gap.Stator core adopts open slot, and tooth is the straight-tooth that the facewidth is equal; Stator winding adopts individual layer to concentrate winding, and every groove is wound with a set of winding, and the tooth that is wound with winding is called armature tooth, does not have the tooth of winding to be called spaced teeth; After stator winding winds on mould in embed wholly groove; Stator winding in embedded groove adopts epoxide-resin glue embedding; On rotor, permanent magnet adopts halbach array, directly sticks in rotating shaft.
Above-mentioned armature tooth and spaced teeth are designed to wide, stator facewidth pole embrace
k s represent,
k s =(0.4 ~ 0.6).
Above-mentioned motor stator slot number and rotor number of poles need meet
z=
p± 2,
zfor number of slots,
pfor rotor number of poles.
Before above-mentioned electric machine winding, need to make the mould consistent with armature tooth shape, after winding line gluing on online mould and fixing, in embed wholly stator slot.
After in said stator winding embedded groove, need to be under vacuum high-pressure environment while adopting epoxide-resin glue embedding in groove, need fill up in groove and winding overhang gap, epoxide-resin glue is close to stator core in groove, at end and casing and motor two side ends, cover tightly subsides.
Above-mentioned permanent magnet inner side is designed to straight line, directly sticks in polygon rotating shaft, and rotor iron-core-free, permanent magnet adopts stainless steel sleeve or carbon fibre to wrap.
In above-mentioned halbach array permanent magnetism rotor, the number of every utmost point permanent magnet is 2, and magnetizing direction is respectively radially and is tangential, and the permanent magnet polar arc coefficient of definition diametrical magnetization direction is
k r ,
k r =(0.4 ~ 0.7).
The invention has the beneficial effects as follows:
1, motor copper factor of the present invention is not less than 65%, and winding overhang stretches out short, and electric machine structure is compact.
2, the present invention adopts open slot straight-tooth structure to avoid using pole shoe tooth, and rule is convenient.
3, winding by epoxy resin encapsulated after, perfect heat-dissipating, especially end winding conducts the heat on end cap and casing by epoxy resin, has solved the winding overhang difficult problem of dispelling the heat.
4, open slot straight-tooth structure increases motor stator winding magnetic circuit reluctance, and inductance reduces, and has improved power factor.
5, the stator winding on motor stator is centralized winding, and winding overhang is short, and resistance and copper loss are less.
6, every groove only has a set of winding, plays the decoupling zero of motor physical isolation, heat isolation and magnetic circuit between phase and phase.
7, iron-core-free halbach array permanent magnetism rotor has been saved rotor space, has improved power of motor density, has reduced moment of inertia.
8, the location torque that the permanent magnet of iron-core-free halbach array radial magnetizing produces and the permanent magnet partial offset of cutting orientation magnetizing, reduced torque pulsation.
Accompanying drawing explanation
Fig. 1 is electric machine structure schematic diagram, and wherein (a) is original electric machine structure, is (b) the present invention.
Fig. 2 is magnet structure figure of the present invention.
Fig. 3 is pictorial diagram after electric machine structure winding epoxy resin encapsulated of the present invention.
Fig. 4 self neutralizing frequency comparison diagram of the present invention.
The unloaded counter potential waveform figure of Fig. 5 the present invention.
Fig. 6 the present invention and common pole shoe structure stator tooth be torque comparison diagram when identical rotor.
In figure: 1. stator core; 2. stator winding; 3. permanent magnet.
Embodiment
4 phase 8 groove 6 utmost point permanent magnets of take are example, and its structural representation is shown in Fig. 1, and the present invention is comprised of stator core 1, stator winding 2, rotor permanent magnet 3.On stator core 1, be uniformly distributed 8 armature straight-tooth, on the armature tooth of being often separated by, be wound with a set of concentrated winding and have a phase of one's own.The pole embrace of stator core 1
k s =0.5.Stator winding winds line on mould, after fixing, is transplanted in stator slot with glue, and winding copper factor is about 68%, has more originally improved 18%.The good winding of coiling adopts epoxide-resin glue embedding, and Fig. 3 is the motor picture of embedding after good.
Between stator 1 and rotor permanent magnet 3, have air gap, value is 1mm here.
The number of poles of rotor permanent magnet 3 is 6, gets the permanent magnet polar arc coefficient of diametrical magnetization direction in the present invention
k r =0.46, the magnetized permanent magnet polar arc of tangential permanent magnet body coefficient is 0.54, and the direction of magnetization of permanent magnet as shown in Figure 2.Each permanent magnet is sector structure, and fan-shaped permanent magnet inner side directly sticks in rotating shaft for straight line, and tangential permanent magnet body equates with the size of radial permanent magnet body, and the stainless steel sleeve that permanent magnet employing thickness is 1mm is fixed.
The most of process of the magnetic flux path spaced teeth of stator winding 2 of the present invention forms loop, and not with other phase stator winding interlinkage, realized the space physics isolation of stator winding 2, make each phase winding of motor separate, between each phase, the independence of magnetic circuit has obtained enhancing, fundamentally avoided the generation of phase fault, make the Halbach type magneto that each phase mutual inductance of motor is more general reduce to some extent simultaneously, Fig. 4 is inductance curve of the present invention, the ratio of mutual inductance and self-induction is 2.08%, than traditional motor, mutual inductance reduces greatly with the ratio of self-induction.Therefore, motor of the present invention has higher fault freedom.
Fig. 5 has provided empty load of motor counter potential waveform figure of the present invention, and as can be seen from the figure the unloaded sine degree of back electromotive force of electric machine structure of the present invention is high, and harmonic content is little.
Fig. 6 has provided the electromagnetic torque of motor B of the present invention and the comparison diagram of existing motor A, can significantly find out that electromagnetic torque pulsation is more much smaller than the pulsation of existing motor.
Claims (5)
1. one kind high copper factor high-performance open slot straight-tooth magneto, comprise stator, rotor, stator consists of stator core (1) and stator winding (2), rotor consists of permanent magnet (3) and rotating shaft, between stator and rotor, there is air gap, it is characterized in that: stator core (1) adopts open slot, and tooth is the straight-tooth that the facewidth is equal; Stator winding (2) adopts individual layer to concentrate winding, and every groove is wound with a set of winding, and the tooth that is wound with winding is called armature tooth, does not have the tooth of winding to be called spaced teeth; Permanent magnet (3) adopts halbach array, directly sticks in rotating shaft.
2. a kind of high copper factor high-performance open slot straight-tooth magneto according to claim 1, is characterized in that: described armature tooth and spaced teeth are wide extremely lonely coefficient for the facewidth
k s represent,
k s value is 0.4 ~ 0.6.
3. a kind of high copper factor high-performance open slot straight-tooth magneto according to claim 1, is characterized in that: the number of poles p that the groove of described stator is counted z and rotor meets
z=
p± 2.
4. a kind of high copper factor high-performance open slot straight-tooth magneto according to claim 1, it is characterized in that: described stator winding (2) winds after line in embed wholly groove on mould, after in embedded groove, adopt epoxide-resin glue embedding under vacuum high-pressure environment, epoxide-resin glue is close to stator core (1) in groove, at end and casing and motor two side ends, is covered tightly subsides.
5. a kind of high copper factor high-performance open slot straight-tooth magneto according to claim 1, is characterized in that: in described rotor, the number of every utmost point permanent magnet is 2, and magnetizing direction is respectively radially and is tangential, and the permanent magnet polar arc coefficient of definition diametrical magnetization is
k r ,
k r value is 0.4 ~ 0.7.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310581479.8A CN103647421A (en) | 2013-11-20 | 2013-11-20 | High slot-fill factor high-performance permanent magnet motor with open slots and straight teeth |
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| CN201310581479.8A CN103647421A (en) | 2013-11-20 | 2013-11-20 | High slot-fill factor high-performance permanent magnet motor with open slots and straight teeth |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104716753A (en) * | 2014-11-25 | 2015-06-17 | 宁波金鸡强磁股份有限公司 | Magnet with low pole-arc coefficient and manufacturing method thereof |
| CN106230213A (en) * | 2016-08-08 | 2016-12-14 | 太原理工大学 | Interturn in stator windings short trouble automatic fault tolerant polyphase synchronous generator |
| CN107482803A (en) * | 2017-08-30 | 2017-12-15 | 广东威灵电机制造有限公司 | Stator module, motor and compressor |
| CN107659012A (en) * | 2017-10-25 | 2018-02-02 | 常州威灵电机制造有限公司 | Rotor punching, rotor and motor |
| CN108343671A (en) * | 2018-02-07 | 2018-07-31 | 苏州麦格奈迪磁悬浮技术有限公司 | A kind of magnetic axis bearing assembly preparation process |
| CN108964395A (en) * | 2018-09-26 | 2018-12-07 | 艾德斯汽车电机无锡有限公司 | A kind of permanent-magnet synchronous rimless motor of the rotor without silicon steel structure |
| CN109417316A (en) * | 2016-07-14 | 2019-03-01 | 三菱电机株式会社 | Stator, motor, pressure fan, electric dust collector and method for winding |
| WO2021139455A1 (en) * | 2020-01-07 | 2021-07-15 | 上海舞肌科技有限公司 | Permanent magnet brushless electric motor, robot joint, servo steering engine actuator, and robot |
| CN115149765A (en) * | 2022-07-05 | 2022-10-04 | 北京航空航天大学 | Six-phase fault-tolerant permanent magnet synchronous motor |
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Cited By (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104716753A (en) * | 2014-11-25 | 2015-06-17 | 宁波金鸡强磁股份有限公司 | Magnet with low pole-arc coefficient and manufacturing method thereof |
| CN109417316A (en) * | 2016-07-14 | 2019-03-01 | 三菱电机株式会社 | Stator, motor, pressure fan, electric dust collector and method for winding |
| US12003136B2 (en) | 2016-07-14 | 2024-06-04 | Mitsubishi Electric Corporation | Winding method |
| US11637461B2 (en) | 2016-07-14 | 2023-04-25 | Mitsubishi Electric Corporation | Stator, motor, fan, vacuum cleaner, and winding method |
| CN106230213A (en) * | 2016-08-08 | 2016-12-14 | 太原理工大学 | Interturn in stator windings short trouble automatic fault tolerant polyphase synchronous generator |
| CN107482803A (en) * | 2017-08-30 | 2017-12-15 | 广东威灵电机制造有限公司 | Stator module, motor and compressor |
| CN107659012A (en) * | 2017-10-25 | 2018-02-02 | 常州威灵电机制造有限公司 | Rotor punching, rotor and motor |
| CN107659012B (en) * | 2017-10-25 | 2024-07-12 | 广东威灵电机制造有限公司 | Rotor punching sheet, rotor and motor |
| CN108343671B (en) * | 2018-02-07 | 2020-09-01 | 北京昆腾迈格技术有限公司 | Preparation process of magnetic bearing component |
| CN108343671A (en) * | 2018-02-07 | 2018-07-31 | 苏州麦格奈迪磁悬浮技术有限公司 | A kind of magnetic axis bearing assembly preparation process |
| CN108964395A (en) * | 2018-09-26 | 2018-12-07 | 艾德斯汽车电机无锡有限公司 | A kind of permanent-magnet synchronous rimless motor of the rotor without silicon steel structure |
| WO2021139455A1 (en) * | 2020-01-07 | 2021-07-15 | 上海舞肌科技有限公司 | Permanent magnet brushless electric motor, robot joint, servo steering engine actuator, and robot |
| CN115149765A (en) * | 2022-07-05 | 2022-10-04 | 北京航空航天大学 | Six-phase fault-tolerant permanent magnet synchronous motor |
| CN115149765B (en) * | 2022-07-05 | 2024-06-28 | 北京航空航天大学 | Six-phase fault-tolerant permanent magnet synchronous motor |
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