CN106712335A - Anti-flux leakage low-loss driving motor design - Google Patents
Anti-flux leakage low-loss driving motor design Download PDFInfo
- Publication number
- CN106712335A CN106712335A CN201610408023.5A CN201610408023A CN106712335A CN 106712335 A CN106712335 A CN 106712335A CN 201610408023 A CN201610408023 A CN 201610408023A CN 106712335 A CN106712335 A CN 106712335A
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- rotor
- stator
- silicon steel
- matrix
- ring
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Links
- 229910000976 Electrical steel Inorganic materials 0.000 claims abstract description 47
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 34
- 238000003475 lamination Methods 0.000 claims abstract description 26
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 14
- 239000010959 steel Substances 0.000 claims abstract description 14
- 238000004804 winding Methods 0.000 claims abstract description 7
- 239000011159 matrix material Substances 0.000 claims description 44
- 238000005096 rolling process Methods 0.000 claims description 7
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims description 4
- 229910052710 silicon Inorganic materials 0.000 claims description 4
- 239000010703 silicon Substances 0.000 claims description 4
- 239000000853 adhesive Substances 0.000 claims description 3
- 238000002955 isolation Methods 0.000 claims description 3
- 239000000203 mixture Substances 0.000 claims description 3
- 238000003466 welding Methods 0.000 claims description 3
- 238000004026 adhesive bonding Methods 0.000 claims 1
- 230000004907 flux Effects 0.000 abstract description 9
- 230000035699 permeability Effects 0.000 abstract 1
- 230000010287 polarization Effects 0.000 abstract 1
- 238000010586 diagram Methods 0.000 description 10
- 229910052742 iron Inorganic materials 0.000 description 4
- 239000000696 magnetic material Substances 0.000 description 2
- 229920001296 polysiloxane Polymers 0.000 description 2
- 238000005097 cold rolling Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 230000005713 exacerbation Effects 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000004080 punching Methods 0.000 description 1
Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K1/00—Details of the magnetic circuit
- H02K1/06—Details of the magnetic circuit characterised by the shape, form or construction
- H02K1/12—Stationary parts of the magnetic circuit
- H02K1/17—Stator cores with permanent magnets
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K1/00—Details of the magnetic circuit
- H02K1/06—Details of the magnetic circuit characterised by the shape, form or construction
- H02K1/12—Stationary parts of the magnetic circuit
- H02K1/16—Stator cores with slots for windings
- H02K1/165—Shape, form or location of the slots
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K1/00—Details of the magnetic circuit
- H02K1/06—Details of the magnetic circuit characterised by the shape, form or construction
- H02K1/22—Rotating parts of the magnetic circuit
- H02K1/27—Rotor cores with permanent magnets
- H02K1/2706—Inner rotors
- H02K1/272—Inner rotors the magnetisation axis of the magnets being perpendicular to the rotor axis
- H02K1/274—Inner rotors the magnetisation axis of the magnets being perpendicular to the rotor axis the rotor consisting of two or more circumferentially positioned magnets
- H02K1/2753—Inner rotors the magnetisation axis of the magnets being perpendicular to the rotor axis the rotor consisting of two or more circumferentially positioned magnets the rotor consisting of magnets or groups of magnets arranged with alternating polarity
- H02K1/276—Magnets embedded in the magnetic core, e.g. interior permanent magnets [IPM]
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K15/00—Methods or apparatus specially adapted for manufacturing, assembling, maintaining or repairing of dynamo-electric machines
- H02K15/02—Methods or apparatus specially adapted for manufacturing, assembling, maintaining or repairing of dynamo-electric machines of stator or rotor bodies
- H02K15/03—Methods or apparatus specially adapted for manufacturing, assembling, maintaining or repairing of dynamo-electric machines of stator or rotor bodies having permanent magnets
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/60—Other road transportation technologies with climate change mitigation effect
- Y02T10/64—Electric machine technologies in electromobility
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Iron Core Of Rotating Electric Machines (AREA)
Abstract
The invention provides an anti-flux leakage low-loss driving motor, which comprises a stator and a rotor, wherein the stator comprises a stator iron core and stator windings; the rotor comprises a rotor iron core and rotor magnetic steels; the stator iron core comprises an annular stator iron core yoke ring base body formed by non-oriented silicon steel laminations and multiple stator iron core tooth inserts formed by oriented silicon steel laminations; the rotor iron core comprises an annular rotor iron core base body formed by non-oriented silicon steel laminations and multiple rotor iron core inserts formed by oriented silicon steel laminations. The oriented silicon steel lamination with higher permeability is used for replacing the non-oriented silicon steel lamination in the rotor polarization direction, and a stator pole shoe also uses the oriented silicon steel lamination. Thus, in a large current condition, the saturation flux density is high, the loss is reduced, the driving motor efficiency is improved, and a large-torque low-loss driving motor is thus realized.
Description
Technical field
The present invention relates to motor, more particularly to a kind of anti-leakage field low-loss motor.
Background technology
At present, many application cold rolling non-orientation silicon steel design and fabrications of motor, but with new-energy automobile technical performance
Continue to develop and raising.Requirements at the higher level are proposed to new-energy automobile motor, motor needs high power density, torsion high
Square, high power, rotating speed high, low-loss.To meet these demands, motor be compelled to do it is increasing, increasingly weigh, more
Carry out more expensive, loss more and more higher, these have all run counter to environmental protection, energy-saving and emission-reduction this long term growth targets.Driven to meet
Motor high request, the increase of motor volume weight, cost uprises and loss exacerbation will be caused using prior art.
The content of the invention
A kind of purpose of the present invention, exactly in order to solve the above problems, there is provided new anti-leakage field low-loss motor.
In order to achieve the above object, present invention employs following technical scheme：A kind of anti-leakage field low-loss motor, bag
Include stator and rotor；Stator includes stator core and stator winding, and rotor includes rotor core and rotor magnetic steel；
The stator core includes the annular stator core matrix being made up of stator non-orientation silicon steel lamination and multiple by fixed
The stator core inserts of sub- orientation silicon steel lamination composition, multiple stator core inserts uniform intervals are connected to the interior of stator core matrix
Hand hay cutter, multiple stator winding pass through between each adjacent stator core inserts respectively；
The non-orientation silicon steel that described annular stator yoke portion ring base is used uses single punch-die impact style, first according to yoke portion
Design drawing strikes out the consistent monolithic of some shapes, external in ring group to it by the way of welding after these monolithics are laminated
It is annular cylinder to be welded on circle tangent plane.Non-orientation silicon steel be magnetic conductivity isotropism soft magnetic materials, silicone content between
Between 0.8%-3.0%, saturation flux density is between 1.66T ~ 1.73T.During motor operation, the magnetic flux of usual stator yoke is close
Degree is low compared with teeth portion, and the electromagnetic performance of motor stator is mainly determined by teeth portion.Therefore, yoke portion can use relative difficult processing
Relatively low non-orientation silicon steel is spent to make.
Described stator teeth is made up of several with the tooth block of yoke portion equal number, and each tooth block uses oriented silicon
Steel, single punch-die impact style is used per a piece of orientation silicon steel, first strikes out the consistent monolithic of some shapes according to teeth portion design drawing,
Then the bonding between piece and piece is carried out to it by the way of self-adhesive, consistent the taking along magnetic line of force rolling direction of shape is constituted
To silicon steel tooth block.Orientation silicon steel is magnetic conductivity anisotropy soft magnetic materials, and silicone content is rolled more than 3.0% along orientation silicon steel
Direction is sequentially reduced with the saturation flux density of horizontal direction, along the saturation flux density of rolling direction between 1.84T ~ 1.94T
Between, saturation flux density is between 1.10T ~ 1.20T in transverse direction.During motor operation, the electromagnetic performance of motor stator
Mainly determined by teeth portion, then can use along the orientation silicon steel of rolling direction to design and make teeth portion as far as possible, increase it
Saturation flux density, reduces its core loss, but needs to avoid the occurrence of as far as possible orientation silicon steel transversely in teeth portion.
The non-orientation silicon steel that described ring-shaped rotor matrix is used uses single punch-die impact style, first according to matrix design drawing
Strike out the consistent monolithic of some shapes, after these monolithics are laminated, to it in ring base inner circle by the way of welding, i.e., with
It is annular cylinder to be welded on the tangent plane of axle contact.
Described rotor core inserts is made up of several with the tooth block of rotor annular matrix equal number, each tooth block
Using orientation silicon steel, single punch-die impact style is used per a piece of orientation silicon steel, first strike out some shapes according to teeth portion design drawing
Consistent monolithic, then carries out the bonding between piece and piece by the way of self-adhesive to it, constitutes shape consistent along the magnetic line of force
The oriented silicon steel-tooth block of rolling direction.
The rotor core includes the ring-shaped rotor iron core matrix being made up of rotor non-orientation silicon steel lamination and multiple by turning
The rotor core inserts of sub- orientation silicon steel lamination composition, multiple rotor core inserts uniform intervals interlockings are in rotor core matrix
Outside simultaneously collectively constitutes rounded outer surface with rotor core matrix, multiple rotor magnetic steels be separately positioned on rotor core matrix with it is each
Between rotor core inserts.
The inner side uniform intervals of the annular stator core matrix are provided with multiple axial direction dovetail grooves, and each stator core is embedding
Part is provided with corresponding dovetail, and each stator core inserts is connected with annular stator core matrix joggle respectively.
The ring-shaped rotor iron core intrinsic silicon is provided with the axis hole for installing rotating shaft, and outside forms hexagram structure,
Each rotor core inserts is inlaid between two adjacent star angles respectively.
Each Xing Jiao tops of the ring-shaped rotor iron core matrix are respectively provided on two sides with the Ka Jiao for turning up, each rotor core
Inserts is respectively provided on two sides with corresponding extension wedge angle, and each rotor core inserts rabbets phase with ring-shaped rotor iron core matrix respectively
Even.
The ring-shaped rotor iron core matrix each star angle inner side be respectively equipped with axially through rotor lightening hole.
The rotor lightening hole is triangular in shape.
The outside of the rotor core inserts is in circular arc, inner side shape in obtuse angle；Each rotor magnetic steel is separately positioned on each blunt
Between angle both sides and ring-shaped rotor iron core matrix.
Each rotor magnetic steel is respectively arranged at two ends with magnet isolation tank.
Anti- leakage field low-loss motor of the invention uses the orientation silicon steel that magnetic conductivity is higher in rotor polarised direction
Lamination replaces non-orientation silicon steel lamination, while stator core inserts also uses orientation silicon steel lamination.So in larger current situation
Under still have saturation flux density higher, reduce loss improve motor efficiency, so as to realize high pulling torque low-loss drive
Motor.
In the present invention, orientation, non-oriented silicon steel sheet combination application make rotor have larger saturation flux density, with
Reluctance torque is produced further to improve the unitary current of motor using it.D-axis magnetic circuit is due to the presence for having permanent magnet so that its
Effective air gap is larger, thus the influence of d-axis electroreception direct-axis current is insensitive；And effective air gap is small in quadrature axis magnetic circuit so that hand over
Axle inductance is influenceed larger by quadrature axis current, with the increase of quadrature axis current, quadrature axis magnetic circuit saturation acutely, quadrature axis inductance drastically under
Drop.This allow for convex grey subset of the motor in low speed high capacity than it is unloaded when reduce.The saturation of quadrature axis magnetic circuit is mainly reflected in fixed
The saturation of sub- tooth, the saturation of yoke and rotating pole-piece.For stator saturation, made by orientation silicon steel by using stator tooth, yoke,
And the area of reasonable distribution tooth, yoke can effectively be alleviated.To rotating pole-piece saturation, but pole shoe is tangentially rolled, though so
So rotor leakage is increased, but the magnetic conductivity of quadrature axis magnetic circuit is significantly increased, can also ensure that motor still has in the case of larger current
There is convex grey subset higher；The anti-leakage field low-loss motor that the present invention is provided utilizes the overall system of prior art feasible system
Make, assembling realizability is strong.
Brief description of the drawings
Fig. 1 is rotor cross-sectional structure schematic diagram of the invention.
Fig. 2 is rotor cross-section partial schematic diagram of the invention.
Fig. 3 is stator cross section of the invention partial schematic diagram.
Fig. 4 is rotor cross section of the invention partial schematic diagram.
Fig. 5 is stator and rotor sructure schematic diagram of the invention.
Fig. 6 is stator structure schematic diagram of the invention.
Fig. 7 is rotor structure schematic diagram of the invention.
Fig. 8 is rotor part lamination schematic diagram of the invention.
Fig. 9 is stator partial structural diagram of the invention.
Figure 10 is rotor local structural representation of the invention.
Figure 11 is stator teeth punching schematic diagram of the invention.
Specific embodiment
Referring to Fig. 1, coordinate referring to Fig. 2-Figure 11, anti-leakage field low-loss motor of the invention, including stator and rotor；
Stator includes stator core and stator winding 10, and rotor includes rotor core and rotor magnetic steel 1.
Stator core in the present invention includes the annular stator core matrix 7 being made up of stator non-orientation silicon steel lamination and many
The individual stator core inserts 8 being made up of stator orientation silicon steel lamination, multiple stator core inserts uniform intervals are connected to stator iron
The interior hand hay cutter of core matrix, multiple stator winding 10 pass through between each adjacent stator core inserts respectively.
Rotor core in the present invention includes the ring-shaped rotor iron core matrix 4 being made up of rotor non-orientation silicon steel lamination and many
The individual rotor core inserts 2 being made up of rotor orientation silicon steel lamination, multiple rotor core inserts uniform intervals interlockings are in rotor iron
The outside of core matrix simultaneously collectively constitutes rounded outer surface with rotor core matrix, and multiple rotor magnetic steels are separately positioned on rotor core
Between matrix and each rotor core inserts.
The inner side uniform intervals of above-mentioned annular stator core matrix 7 are provided with multiple axial direction dovetail grooves 9, each stator core inserts
Corresponding dovetail is provided with, each stator core inserts is connected with annular stator core matrix joggle respectively.
The axis hole for installing rotating shaft is provided with inside above-mentioned ring-shaped rotor iron core matrix 4, outside forms hexagram structure,
Each rotor core inserts 2 is inlaid between two adjacent star angles respectively.
Each Xing Jiao tops of above-mentioned ring-shaped rotor iron core matrix 4 are respectively provided on two sides with the card angle 3 turned up, and each rotor core is embedding
Part is respectively provided on two sides with corresponding extension wedge angle, and each rotor core inserts is connected with the interlocking of ring-shaped rotor iron core matrix respectively.
Be respectively equipped with the inside of each star angle of ring-shaped rotor iron core matrix 4 axially through rotor lightening hole 5, the rotor subtracts
Repeated hole is triangular in shape.
The outside of rotor core inserts is in circular arc, inner side shape in obtuse angle；Each rotor magnetic steel is separately positioned on each obtuse angle two
Between side and ring-shaped rotor iron core matrix.
Magnet isolation tank 6 is respectively arranged at two ends with each rotor magnetic steel.
Using anti-leakage field low-loss motor of the invention, oriented steel band is only horizontal 1/ in the iron loss of rolling direction
3, the ratio between magnetic conductivity is 6：1, its iron loss is about the 1/2 of hot-rolled strip, and magnetic conductivity is 2.5 times of hot-rolled strip.To realize motor
Convex grey subset higher is obtained in design driven motor, the orientation silicon steel lamination that magnetic conductivity is higher is used in rotor polarised direction
Instead of non-orientation silicon steel lamination, while stator pole shoes also use orientation silicon steel lamination.So still have in the case of larger current
Convex grey subset higher, reduces loss, improves motor efficiency.
Claims (12)
1. a kind of anti-leakage field low-loss motor, including stator and rotor；Stator includes stator core and stator winding, rotor
Including rotor core and rotor magnetic steel；It is characterized in that：
The stator core includes the annular stator core yoke portion's matrix being made up of stator non-orientation silicon steel lamination and multiple by fixed
The stator core inserts of sub- orientation silicon steel lamination composition, multiple stator core inserts uniform intervals are connected to stator core yoke portion ring
The interior hand hay cutter of shape matrix, multiple stator winding pass through between each adjacent stator core inserts respectively；
The rotor core includes that the ring-shaped rotor iron core matrix being made up of rotor non-orientation silicon steel lamination and multiple are taken by rotor
To the rotor core inserts that silicon steel laminations are constituted, multiple rotor core inserts uniform intervals interlockings are in the outside of rotor core matrix
And rounded outer surface is collectively constituted with rotor core matrix, multiple rotor magnetic steels are separately positioned on rotor core matrix with each rotor
Between iron core inserts.
2. anti-leakage field low-loss motor as claimed in claim 1, it is characterised in that：The annular stator core matrix
Inner side uniform intervals are provided with multiple axial direction dovetail grooves, and each stator core inserts is provided with corresponding dovetail, each stator core
Inserts is connected with annular stator core matrix joggle respectively.
3. anti-leakage field low-loss motor as claimed in claim 1, it is characterised in that：Inside the ring-shaped rotor core matrix
The axis hole for installing rotating shaft is provided with, outside forms hexagram structure, and each rotor core inserts is inlaid in two-phase respectively
Between adjacent star angle.
4. anti-leakage field low-loss motor as claimed in claim 2, it is characterised in that：Described annular stator yoke portion ring group
The non-orientation silicon steel that body is used uses single punch-die impact style, first strikes out the consistent list of some shapes according to yoke portion design drawing
Piece, after these monolithics are laminated, it is annular cylindrical to use the mode welded that it is welded on the cylindrical tangent plane of ring base
Body.
5. anti-leakage field low-loss motor as claimed in claim 2, it is characterised in that：Described stator teeth is by several
Tooth block with yoke portion equal number is constituted, and each tooth block uses orientation silicon steel, and one-shot die stamping is used per a piece of orientation silicon steel
Mode, first strikes out the consistent monolithic of some shapes according to teeth portion design drawing, then carries out piece to it by the way of self-adhesive
Bonding between piece, constitutes the consistent oriented silicon steel-tooth block along magnetic line of force rolling direction of shape.
6. anti-leakage field low-loss motor as claimed in claim 3, it is characterised in that：Described ring-shaped rotor matrix is used
Non-orientation silicon steel use single punch-die impact style, first strike out the consistent monolithic of some shapes according to matrix design drawing, by this
After a little monolithics are laminated, it is welded into ring base inner circle, i.e., the tangent plane for being contacted with axle by the way of welding be ring
Shape cylinder.
7. anti-leakage field low-loss motor as claimed in claim 3, it is characterised in that：If described rotor core inserts by
Dry is constituted with the tooth block of rotor annular matrix equal number, and each tooth block uses orientation silicon steel, is adopted per a piece of orientation silicon steel
Single punch-die impact style is used, first the consistent monolithic of some shapes is struck out according to teeth portion design drawing, then using the side of self-adhesive
Formula carries out the bonding between piece and piece to it, constitutes the consistent oriented silicon steel-tooth block along magnetic line of force rolling direction of shape.
8. anti-leakage field low-loss motor as claimed in claim 3, it is characterised in that：The ring-shaped rotor iron core matrix
Each Xing Jiao tops are respectively provided on two sides with the Ka Jiao for turning up, and each rotor core inserts is respectively provided on two sides with corresponding extension point
Angle, each rotor core inserts is connected with the interlocking of ring-shaped rotor iron core matrix respectively.
9. anti-leakage field low-loss motor as claimed in claim 3, it is characterised in that：The ring-shaped rotor iron core matrix
Each star angle inner side be respectively equipped with axially through rotor lightening hole.
10. anti-leakage field low-loss motor as claimed in claim 9, it is characterised in that：The rotor lightening hole is in triangle
Shape.
11. anti-leakage field low-loss motors as claimed in claim 1, it is characterised in that：Outside the rotor core inserts
Side is in circular arc, inner side shape in obtuse angle；Each rotor magnetic steel is separately positioned between each obtuse angle both sides and ring-shaped rotor iron core matrix.
12. anti-leakage field low-loss motors as claimed in claim 11, it is characterised in that：The two ends of each rotor magnetic steel
It is respectively equipped with magnet isolation tank.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610408023.5A CN106712335B (en) | 2016-06-12 | 2016-06-12 | Anti-magnetic leakage low-loss driving motor design |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610408023.5A CN106712335B (en) | 2016-06-12 | 2016-06-12 | Anti-magnetic leakage low-loss driving motor design |
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| Publication Number | Publication Date |
|---|---|
| CN106712335A true CN106712335A (en) | 2017-05-24 |
| CN106712335B CN106712335B (en) | 2024-03-01 |
Family
ID=58939676
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| CN201610408023.5A Active CN106712335B (en) | 2016-06-12 | 2016-06-12 | Anti-magnetic leakage low-loss driving motor design |
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Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107591908A (en) * | 2017-09-30 | 2018-01-16 | 苏州英磁新能源科技有限公司 | A kind of orientation silicon steel stator for disc type electric machine |
| CN107659005A (en) * | 2017-09-30 | 2018-02-02 | 上海英磁新能源科技有限公司 | A kind of disc type superconducting motor |
| CN108134491A (en) * | 2017-12-22 | 2018-06-08 | 上海电机系统节能工程技术研究中心有限公司 | A kind of permanent-magnetic synchronous motor rotor Core Design method |
| CN108199505A (en) * | 2017-12-29 | 2018-06-22 | 上海英磁新能源科技有限公司 | A kind of orientation silicon steel stator core and preparation method thereof |
| CN110212727A (en) * | 2018-12-29 | 2019-09-06 | 苏州英磁新能源科技有限公司 | A kind of Permanent magnet axial flux motor |
| CN111725906A (en) * | 2020-01-07 | 2020-09-29 | 上海舞肌科技有限公司 | Permanent magnet brushless motor and actuator and robot comprising same |
| CN113346646A (en) * | 2021-06-11 | 2021-09-03 | 西北工业大学 | Mixed silicon steel stator structure, rotor structure matched with same and permanent magnet motor with structure |
| CN113629915A (en) * | 2021-08-03 | 2021-11-09 | 珠海格力电器股份有限公司 | Rotor assembly, electric spindle assembly and motor |
| CN113746234A (en) * | 2021-09-07 | 2021-12-03 | 西安邮电大学 | Motor salient pole rotor made of oriented silicon steel |
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