CN107086720B - Inner rotor permanent magnet synchronous traction machine - Google Patents
Inner rotor permanent magnet synchronous traction machine Download PDFInfo
- Publication number
- CN107086720B CN107086720B CN201710254116.1A CN201710254116A CN107086720B CN 107086720 B CN107086720 B CN 107086720B CN 201710254116 A CN201710254116 A CN 201710254116A CN 107086720 B CN107086720 B CN 107086720B
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- CN
- China
- Prior art keywords
- permanent magnet
- front bearing
- inner rotor
- rotating shaft
- magnet synchronous
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K7/00—Arrangements for handling mechanical energy structurally associated with dynamo-electric machines, e.g. structural association with mechanical driving motors or auxiliary dynamo-electric machines
- H02K7/10—Structural association with clutches, brakes, gears, pulleys or mechanical starters
-
- 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
-
- 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
- H02K1/28—Means for mounting or fastening rotating magnetic parts on to, or to, the rotor structures
- H02K1/30—Means for mounting or fastening rotating magnetic parts on to, or to, the rotor structures using intermediate parts, e.g. spiders
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K21/00—Synchronous motors having permanent magnets; Synchronous generators having permanent magnets
- H02K21/02—Details
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K21/00—Synchronous motors having permanent magnets; Synchronous generators having permanent magnets
- H02K21/12—Synchronous motors having permanent magnets; Synchronous generators having permanent magnets with stationary armatures and rotating magnets
- H02K21/14—Synchronous motors having permanent magnets; Synchronous generators having permanent magnets with stationary armatures and rotating magnets with magnets rotating within the armatures
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- 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)
- Permanent Field Magnets Of Synchronous Machinery (AREA)
Abstract
The invention discloses an inner rotor permanent magnet synchronous traction machine, which comprises a machine base, a rotor assembly, a stator winding and a traction wheel; the machine base is provided with a rotating shaft; the rotor assembly comprises a permanent magnet support and permanent magnets, the permanent magnet support is sleeved outside the rotating shaft, a plurality of mounting grooves are formed in the circumference of the permanent magnet support at equal intervals, each mounting groove extends along the axial direction of the permanent magnet support, the shape of each mounting groove is matched with that of the permanent magnet, and one permanent magnet is correspondingly clamped in one mounting groove; the stator winding is arranged on the machine base and corresponds to the rotor component; the traction sheave is installed at one end of the rotating shaft and is positioned outside the machine base. The permanent magnets are installed through the equally-divided installation grooves, so that the self-locking installation of the permanent magnets can be realized, the process is simple, the permanent magnets are uniformly distributed to ensure that the magnetic field is uniform, the stress is reasonable, and meanwhile, the inner rotor permanent magnet synchronous traction machine is simple in structure and low in cost.
Description
Technical Field
The invention relates to the technical field of elevators, in particular to an inner rotor permanent magnet synchronous traction machine which is simple in structure, reasonable in stress and low in cost.
Background
The gearless permanent magnet synchronous traction machine with the characteristics of low speed and large torque has the advantages of energy conservation, small volume, stable low-speed operation, low noise, no maintenance and the like, and is attracting more and more attention in the elevator industry. The gearless permanent magnet synchronous traction machine mainly consists of a permanent magnet synchronous motor, a traction wheel and a braking system, wherein the permanent magnet synchronous motor adopts a high-performance permanent magnet material and a special motor structure, has the characteristics of energy conservation, environmental protection, low speed, large torque and the like, and the traction wheel and the braking wheel are coaxially and fixedly connected, and the braking system of the traction machine consists of a brake, the braking wheel, a braking arm, a braking shoe and the like.
The existing inner rotor permanent magnet synchronous traction machine has the following two main fixing structures: a rotor punching sheet is designed by utilizing waste materials after stator punching sheet punching, and is formed by laminating, welding and forming the rotor punching sheet. The other is to cast the bracket by casting, finish machining the outer circle and open holes on the permanent magnet to fix on the bracket; the problems with this structure are: because the permanent magnet material is sintered NdFeB, the material characteristics are brittle, the permanent magnet is easy to fracture when the permanent magnet is perforated and fixed by using a screw in a forced manner, and the phenomenon of uneven magnetic field caused by uneven distribution of the permanent magnet exists. In addition, because of lamination and casting molding of the punching sheet, the processing technology is complex, the materials are heavy, and the cost of the two structures is high.
Therefore, it is necessary to provide an inner rotor permanent magnet synchronous traction machine with reasonable stress, simple and reasonable structure, simple process and low cost, so as to solve the problems in the prior art.
Disclosure of Invention
The invention aims to provide an inner rotor permanent magnet synchronous traction machine which is reasonable in stress, simple and reasonable in structure, simple in process and low in cost.
In order to achieve the above purpose, the technical scheme of the invention is as follows: the inner rotor permanent magnet synchronous traction machine comprises a machine base, a rotor assembly, a stator winding and a traction wheel; the machine seat is provided with a rotating shaft; the rotor assembly comprises a permanent magnet support and permanent magnets, wherein the permanent magnet support is sleeved outside the rotating shaft, a plurality of mounting grooves are formed in the circumference of the permanent magnet support at equal intervals, each mounting groove extends along the axial direction of the permanent magnet support, the shape of each mounting groove is matched with that of the permanent magnet, and one permanent magnet is correspondingly clamped in one mounting groove; the stator winding is arranged on the base and corresponds to the rotor assembly; the traction sheave is installed at one end of the rotating shaft and is located outside the machine base.
Preferably, the rotor assembly further comprises two rotor pressing plates, and the two rotor pressing plates are respectively fixed at two ends of the permanent magnet bracket and are propped against the permanent magnets.
Preferably, the mounting groove is a dovetail groove, the design of the dovetail groove is beneficial to self-locking mounting of the permanent magnet, and the permanent magnet does not need to be perforated so as to avoid fragmentation during mounting.
Preferably, the permanent magnet support is formed by an aluminum alloy section, and is simple to process and low in material cost.
Preferably, the inner rotor permanent magnet synchronous traction machine further comprises a front bearing and a rear bearing, wherein the front bearing and the rear bearing are respectively arranged at two ends of the rotating shaft, and the rotor assembly is arranged between the front bearing and the rear bearing.
Preferably, the inner rotor permanent magnet synchronous traction machine further comprises a front bearing gland, wherein a protruding portion is arranged on the front bearing gland, and the front bearing gland is abutted to the rotating shaft and enables the protruding portion to be abutted to one side of the front bearing.
Preferably, the machine base further comprises a front end cover, wherein the front end cover is fixed at one end of the machine base and is propped against the front bearing, and the front end cover is fixed with the front bearing gland.
Preferably, the front end cover is provided with a first abutting portion protruding towards the front bearing gland, the first abutting portion abuts against the surface of the front bearing and abuts against the front bearing gland, and a fixing piece penetrates through the first abutting portion and is connected to the front bearing gland.
Preferably, the stand further comprises a rear end cover, wherein the rear end cover is fixed at the other end of the stand and provided with a second abutting portion, and the second abutting portion abuts against the rear bearing.
Preferably, the inner rotor permanent magnet synchronous traction machine further comprises a brake, wherein the brake is arranged at one end, far away from the traction wheel, of the rotating shaft, and the brake is positioned outside the machine base.
Compared with the prior art, the inner rotor permanent magnet synchronous traction machine has the advantages that the rotor assembly comprises the permanent magnet support and the permanent magnets, the permanent magnet support is sleeved outside the rotating shaft, the circumference of the permanent magnet support is provided with the plurality of mounting grooves at equal intervals, each mounting groove extends along the axial direction of the permanent magnet support and is adaptive to the shape of the permanent magnet, the permanent magnets are correspondingly clamped in each mounting groove, and the permanent magnets are mounted through the mounting grooves which are formed in an equal-division manner, so that the self-locking mounting of the permanent magnets can be realized, the process is simple, the permanent magnets are uniformly distributed to ensure uniform magnetic field, the stress is reasonable, and meanwhile, the inner rotor permanent magnet synchronous traction machine is simple in structure and low in cost.
Drawings
Fig. 1 is a schematic structural view of an inner rotor permanent magnet synchronous traction machine of the present invention.
Fig. 2 is an enlarged schematic view of the portion a in fig. 1.
Fig. 3 is an enlarged schematic view of the rotor assembly of fig. 1.
Fig. 4 is a side view of the permanent magnet holder of fig. 3 mated with a permanent magnet.
Detailed Description
Embodiments of the present invention will now be described with reference to the drawings, wherein like reference numerals represent like elements throughout. The inner rotor permanent magnet synchronous traction machine 100 provided by the invention is applicable to all inner rotor permanent magnet synchronous gearless traction machines.
Referring to fig. 1-3, an inner rotor permanent magnet synchronous traction machine 100 of the present invention includes a machine base 110, a rotating shaft 120, a rotor assembly 130, a stator winding 140, a traction sheave 150, a brake 160, and a junction box 170. The rotating shaft 120 is mounted on the stand 110, the rotor assembly 130 is sleeved outside the rotating shaft 120, the stator winding 140 is fixed on the stand 110 and located at the outer side of the rotor assembly 130, the stator winding 140 corresponds to the rotor assembly 130, the traction sheave 150 and the brake 160 are respectively mounted at two ends of the rotating shaft 120 and located outside the stand 110, and the junction box 170 is mounted on the stand 110 and connected with the stator winding 140.
Referring to fig. 3-4, the rotor assembly 130 includes a permanent magnet bracket 131, a permanent magnet 132, and two rotor pressing plates 133, the permanent magnet bracket 131 is formed by an aluminum alloy profile, and a plurality of mounting grooves 1311 are formed on the circumference of the permanent magnet bracket 131 at equal intervals, each mounting groove 1311 extends along the axial direction of the permanent magnet bracket 131, the shape of the mounting groove 1311 is adapted to that of the permanent magnet 132, a permanent magnet 132 is correspondingly clamped in one mounting groove 1311, the two rotor pressing plates 133 are respectively fixed at two ends of the permanent magnet bracket 131, and each rotor pressing plate 133 is pressed against an end of the permanent magnet 132, so that two ends of the permanent magnet 132 are fixed by the rotor pressing plates 133. The permanent magnets 132 are installed by arranging the installation grooves 1311 on the permanent magnet brackets 131, so that the permanent magnets 132 can be installed in a self-locking manner, holes are not required to be formed in the permanent magnets 132, the permanent magnets 132 are prevented from being broken during installation, and the permanent magnets 132 are uniformly distributed, so that the magnetic field uniformity is ensured; in addition, the permanent magnet bracket 131 is made of aluminum alloy section bars, so that the processing is simple and the material cost is low.
In the present invention, the mounting groove 1311 is preferably a dovetail groove, and the dovetail groove can conveniently realize self-locking mounting of the permanent magnet 132, but the shape of the mounting groove 1311 is not limited thereto, and may be designed into other shapes.
Referring to fig. 1-3, the inner rotor permanent magnet synchronous traction machine 100 further includes a front bearing 134, a rear bearing 135 and a front bearing gland 136, wherein the front bearing 134 and the rear bearing 135 are respectively mounted at two ends of the rotating shaft 120, the rotor assembly 130 is positioned between the front bearing 134 and the rear bearing 135, and the front bearing 134 is positioned by the front bearing gland 136.
Specifically, the middle portion of the front bearing cover 136 has a protruding portion 1361, and the front bearing cover 136 is disposed outside the rotating shaft 120 such that the protruding portion 1361 abuts against one side of the front bearing 134.
With continued reference to fig. 1-2, the inner rotor permanent magnet synchronous traction machine 100 further includes a front end cover 137 and a rear end cover 138, the front end cover 137 is mounted on the front bearing 134 and is fixed by the front bearing cover 136, the front end cover 137 is further fixed at one end of the machine base 110, and the rear end cover 138 is mounted on the rear bearing 135 and is fixed at the other end of the machine base 110.
Specifically, a spigot (not numbered) is formed at the edge of the front cover 137, and a first interference portion 1371 is protruded at the middle portion thereof. During installation, the spigot of the front end cover 137 is clamped at the end part of the stand 110, and the spigot and the stand are fixed by a fixing piece 139; meanwhile, the front end cover 137 abuts against one side of the front bearing 134 far away from the front bearing gland 136, and the first abutting portion 1371 thereof protrudes toward the front bearing gland 136, the first abutting portion 1371 abuts against the surface of the front bearing 134, the end portion of the first abutting portion 1371 abuts against the front bearing gland 136, and a fixing piece 139 is inserted into the first abutting portion 1371 and connected to the front bearing gland 136, so as to fix the two parts.
In the present invention, the fixing member 139 is preferably a screw, but not limited thereto.
As shown in fig. 1, the rear end cap 138 is provided with a second abutting portion 1381, when the rear end cap 138 is mounted, the rear end cap 138 abuts against one side of the rear bearing 135, the second abutting portion 1381 abuts against the surface of the rear bearing 135, and the rear end cap 138 is fixed at the end of the stand 110.
As shown in the following fig. 1 to 4, when the rotor assembly 130 of the inner rotor permanent magnet synchronous traction machine 100 of the present invention is assembled, the permanent magnets 132 are first snapped into dovetail grooves on the permanent magnet brackets 131 in a one-to-one correspondence, and then the rotor pressing plates 133 are respectively fixed at both ends of the permanent magnet brackets 131, so that the rotor pressing plates 133 are pressed against the ends of the permanent magnets 132, thereby fixing the front and rear ends of the permanent magnets 132, the assembly process is simple, and the permanent magnets 132 can be uniformly distributed on the permanent magnet brackets 131, thereby making the magnetic field uniform. The permanent magnet bracket 131 is formed by an aluminum alloy section, and is simple to process and low in material cost.
When the inner rotor permanent magnet synchronous traction machine 100 is installed, the permanent magnet bracket 131 is sleeved outside the rotating shaft 120, and the permanent magnet bracket and the rotating shaft are fixedly connected; the rotary shaft 120 with the rotor assembly 130 is mounted on the stand 110, and the front and rear ends of the rotary shaft 120 are respectively provided with a front bearing 134 and a rear bearing 135, the rotor assembly 130 is located between the front bearing 134 and the rear bearing 135, wherein a front bearing gland 136 is arranged on one side of the front bearing 134. The stator windings 140 are then secured to the housing 110, with the stator windings 140 being located outside and corresponding to the rotor assembly 130. Next, the front end cover 137 and the rear end cover 138 are attached, that is, the front end cover 137 is attached to the front bearing 134, the front end cover 137 is pressed against the front bearing 134 and fixed to the front bearing cover 136 and one end of the housing 110, and the rear end cover 138 is attached to the rear bearing 135 and fixed to the other end of the housing 110.
Finally, the traction sheave 150 and the brake 160 are respectively installed at both ends of the rotation shaft 120, both of which are located outside the machine frame 110, and the terminal box 170 is installed on the machine frame 110 and connected to the stator winding 140.
In summary, since the rotor assembly 130 of the inner rotor permanent magnet synchronous traction machine 100 of the present invention includes the permanent magnet bracket 131 and the permanent magnets 132, the permanent magnet bracket 131 is sleeved outside the rotating shaft 120, and a plurality of mounting grooves 1311 are formed on the circumference of the permanent magnet bracket 131 at equal intervals, each mounting groove 1311 extends along the axial direction of the permanent magnet bracket 131 and has a shape corresponding to the shape of the permanent magnet 132, a permanent magnet 132 is correspondingly clamped in each mounting groove 1311, and the permanent magnets 132 are mounted through the equally-divided mounting grooves 1311, on one hand, the self-locking mounting of the permanent magnets 132 can be realized, on the other hand, the permanent magnets 132 are uniformly distributed to ensure the magnetic field to be uniform, the stress is reasonable, and meanwhile, the inner rotor permanent magnet synchronous traction machine 100 has a simple structure and low cost.
The construction of the other parts of the inner rotor permanent magnet synchronous traction machine 100 of the present invention is well known to those skilled in the art, and will not be described in detail herein.
The foregoing description of the preferred embodiments of the present invention is not intended to limit the scope of the claims, which follow, as defined in the claims.
Claims (8)
1. An inner rotor permanent magnet synchronous traction machine, which is characterized by comprising:
the machine seat is provided with a rotating shaft;
the rotor assembly comprises a permanent magnet support and permanent magnets, wherein the permanent magnet support is sleeved outside the rotating shaft, a plurality of mounting grooves are formed in the circumference of the permanent magnet support at equal intervals, each mounting groove extends along the axial direction of the permanent magnet support, the shape of each mounting groove is matched with that of the permanent magnet, and one permanent magnet is correspondingly clamped in one mounting groove;
a stator winding mounted on the housing and corresponding to the rotor assembly;
the traction wheel is arranged at one end of the rotating shaft and is positioned outside the machine seat;
the front bearing is arranged at one end of the rotating shaft;
the front bearing gland is provided with a protruding part, the front bearing gland is abutted against the rotating shaft, the side face of the protruding part is abutted against the side face of the front bearing, and the outer surface of the protruding part is flush with the outer surface of the front bearing;
the front end cover is provided with a first abutting portion protruding towards the front bearing gland, the first abutting portion and the protruding portion protrude towards each other, the first abutting portion abuts against the front bearing, the outer surface of the protruding portion abuts against the side wall of the front bearing gland, and a fixing piece penetrates through the first abutting portion and is connected to the front bearing gland.
2. The inner rotor permanent magnet synchronous traction machine according to claim 1, wherein the rotor assembly further comprises two rotor pressing plates, and the two rotor pressing plates are respectively fixed at two ends of the permanent magnet support and pressed against the permanent magnets.
3. The inner rotor permanent magnet synchronous traction machine according to claim 1, wherein the mounting groove is a dovetail groove.
4. The inner rotor permanent magnet synchronous traction machine according to claim 1, wherein the permanent magnet support is formed by an aluminum alloy profile.
5. The inner rotor permanent magnet synchronous traction machine according to claim 1, further comprising a rear bearing, wherein the front bearing and the rear bearing are respectively installed at both ends of the rotating shaft, and the rotor assembly is located between the front bearing and the rear bearing.
6. The inner rotor permanent magnet synchronous traction machine according to claim 1, wherein the front end cover is fixed at one end of the machine base and is pressed against the front bearing, and the front end cover is fixed with the front bearing cover.
7. The inner rotor permanent magnet synchronous traction machine according to claim 5, wherein the machine base further comprises a rear end cover, the rear end cover is fixed to the other end of the machine base and provided with a second abutting portion, and the second abutting portion abuts against the rear bearing.
8. The inner rotor permanent magnet synchronous traction machine according to claim 1, further comprising a brake installed at one end of the rotating shaft far from the traction sheave, and the brake is located outside the machine base.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710254116.1A CN107086720B (en) | 2017-04-18 | 2017-04-18 | Inner rotor permanent magnet synchronous traction machine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710254116.1A CN107086720B (en) | 2017-04-18 | 2017-04-18 | Inner rotor permanent magnet synchronous traction machine |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN107086720A CN107086720A (en) | 2017-08-22 |
| CN107086720B true CN107086720B (en) | 2023-09-05 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710254116.1A Active CN107086720B (en) | 2017-04-18 | 2017-04-18 | Inner rotor permanent magnet synchronous traction machine |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN107086720B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109327087A (en) * | 2018-10-10 | 2019-02-12 | 宁波欣达电梯配件厂 | A kind of split type internal rotor Capstan rotor |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2518257Y (en) * | 2001-03-30 | 2002-10-23 | 沈阳市蓝光自动化技术有限公司 | Permanent magnet synchronous motor for traction mechanism of gearless elevator |
| JP2010154583A (en) * | 2008-12-23 | 2010-07-08 | Hitachi Ltd | Permanent magnet synchronous motor |
| CN203638932U (en) * | 2013-12-27 | 2014-06-11 | 沈阳蓝光永磁电机技术有限公司 | Solid core inner rotor type gearless permanent magnet synchronous tractor for villa elevator |
| CN204012987U (en) * | 2014-06-26 | 2014-12-10 | 日立电梯电机（广州）有限公司 | A kind of internal rotor permanent-magnetic body fixed structure and permagnetic synchronous motor |
| CN206004430U (en) * | 2016-07-30 | 2017-03-08 | 上海度哥驱动设备有限公司 | The permanent magnet synchronous traction machine with outer rotor that a kind of magnetizing direction produces |
| CN206908457U (en) * | 2017-04-18 | 2018-01-19 | 快意电梯股份有限公司 | Internal rotor permanent-magnetic synchro traction machine |
-
2017
- 2017-04-18 CN CN201710254116.1A patent/CN107086720B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2518257Y (en) * | 2001-03-30 | 2002-10-23 | 沈阳市蓝光自动化技术有限公司 | Permanent magnet synchronous motor for traction mechanism of gearless elevator |
| JP2010154583A (en) * | 2008-12-23 | 2010-07-08 | Hitachi Ltd | Permanent magnet synchronous motor |
| CN203638932U (en) * | 2013-12-27 | 2014-06-11 | 沈阳蓝光永磁电机技术有限公司 | Solid core inner rotor type gearless permanent magnet synchronous tractor for villa elevator |
| CN204012987U (en) * | 2014-06-26 | 2014-12-10 | 日立电梯电机（广州）有限公司 | A kind of internal rotor permanent-magnetic body fixed structure and permagnetic synchronous motor |
| CN206004430U (en) * | 2016-07-30 | 2017-03-08 | 上海度哥驱动设备有限公司 | The permanent magnet synchronous traction machine with outer rotor that a kind of magnetizing direction produces |
| CN206908457U (en) * | 2017-04-18 | 2018-01-19 | 快意电梯股份有限公司 | Internal rotor permanent-magnetic synchro traction machine |
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| Publication number | Publication date |
|---|---|
| CN107086720A (en) | 2017-08-22 |
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