CN109936229A - Motor and its electric machine assembly - Google Patents

Motor and its electric machine assembly Download PDF

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Publication number
CN109936229A
CN109936229A CN201711360080.1A CN201711360080A CN109936229A CN 109936229 A CN109936229 A CN 109936229A CN 201711360080 A CN201711360080 A CN 201711360080A CN 109936229 A CN109936229 A CN 109936229A
Authority
CN
China
Prior art keywords
magnetic
rotor
magnetic core
permanent magnet
core
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.)
Pending
Application number
CN201711360080.1A
Other languages
Chinese (zh)
Inventor
李越
柴捷
张涛
陈静
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Johnson Electric Shenzhen Co Ltd
Original Assignee
Johnson Electric Shenzhen Co Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Johnson Electric Shenzhen Co Ltd filed Critical Johnson Electric Shenzhen Co Ltd
Priority to CN201711360080.1A priority Critical patent/CN109936229A/en
Priority to DE102018132060.4A priority patent/DE102018132060A1/en
Publication of CN109936229A publication Critical patent/CN109936229A/en
Pending legal-status Critical Current

Links

Classifications

    • 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
    • H02K1/278—Surface mounted magnets; Inset 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
    • H02K1/14—Stator cores with salient poles
    • 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
    • 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
    • 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
    • H02K21/16—Synchronous motors having permanent magnets; Synchronous generators having permanent magnets with stationary armatures and rotating magnets with magnets rotating within the armatures having annular armature cores with salient poles
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K2213/00—Specific aspects, not otherwise provided for and not covered by codes H02K2201/00 - H02K2211/00
    • H02K2213/03—Machines characterised by numerical values, ranges, mathematical expressions or similar information

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Permanent Field Magnets Of Synchronous Machinery (AREA)
  • Iron Core Of Rotating Electric Machines (AREA)

Abstract

The present invention relates to a kind of motor and its electric machine assembly, the motor includes stator and can be relative to the rotor of stator rotation；The rotor includes shaft and the electric machine assembly.The electric machine assembly includes the permanent magnet that fixing sleeve is set to the rotor magnetic core of the shaft, is embedded into the rotor magnetic core.The permanent magnet makes the rotor magnetic core circumferentially form several magnetic poles, the peripheral surface of the rotor magnetic core is the non-cylindrical being linked to each other to form by multiple first surface and second surface, each corresponding permanent magnet of the first surface, every two adjacent first surface are connected by a second surface.The present invention can reduce the amount of leakage of the magnetic flux by permanent magnet.

Description

Motor and its electric machine assembly
[technical field]
The present invention relates to a kind of motor and its electric machine assembly, which includes bar shape magnetic core and fitted to magnetic core Permanent magnet, rotor magnetic core of the magnetic core preferably as motor.
[background technique]
Brushless motor generally comprises stator and the rotor for being pivotally mounted to stator.Rotor includes rotor magnetic core and peace It is attached to the permanent magnet of rotor magnetic core.Rotor magnetic core forms magnetic pole in the position of corresponding permanent magnet.When being powered, a part of magnetic flux It can be passed through from the position between two neighboring magnetic pole, that is, leakage field reduces motor to affect the performance of motor Output power density.
[summary of the invention]
The purpose of the present invention is intended to provide a kind of magnetic flux and reveals few motor and electric machine assembly.
The first aspect of the present invention provides a kind of motor, including stator and can be relative to the rotor of stator rotation；Described turn The permanent magnet that attached bag includes shaft, fixing sleeve is set to the rotor magnetic core of the shaft, is embedded into the rotor magnetic core, the permanent magnetism Body makes the rotor magnetic core circumferentially form several magnetic poles；The peripheral surface of the rotor magnetic core is by multiple first surfaces and the The non-cylindrical that two surfaces are linked to each other to form, each corresponding permanent magnet of the first surface, every two are adjacent First surface be connected by a second surface.
Further, the rotor magnetic core includes ontology, several magnetic pole pieces and several magnetic bridge portions；The ontology is sheathed on The shaft, several magnetic pole pieces are looped around the periphery of the ontology, pass through a magnetic bridge portion between adjacent pole portion Connection, and the magnetic bridge portion is connected to the ontology.
Further, each magnetic bridge portion includes circumferential magnetic bridge and radial magnetic bridge, and each circumferential magnetic bridge connects phase Two adjacent magnetic pole pieces；The circumferential magnetic bridge connected to it is connected to the ontology by each radial magnetic bridge.
Further, the length of the circumferential magnetic bridge is 3~4 times of the length of the radial magnetic bridge.
Further, the chamber for accommodating a permanent magnet is formed between each magnetic pole piece and the ontology Body.
Further, each magnetic pole piece includes the inner surface being bonded with a permanent magnet and one described One surface.
Further, the corresponding polar arc of each permanent magnet is 120~130 electrical angles.
Further, the outer surface in each magnetic bridge portion is a second surface.
Further, the stator includes stator core, the stator core include annular yoke portion, from the yoke portion to Several stator tooths of interior stretching；The rotor magnetic core is housed in the space that several stator tooths surround；The rotor magnetic core Maximum outside diameter be 0.55~0.65 times of the stator core outer diameter.
The second aspect of the present invention provides a kind of electric machine assembly, including magnetic core and several permanent magnets, several permanent magnets Along the circumferentially distributed of the magnetic core and it is embedded into the magnetic core, the permanent magnet makes the magnetic core circumferentially form several magnetic Pole, the peripheral surface of the magnetic core are the non-cylindrical being linked to each other to form by multiple first surface and second surface, each The corresponding permanent magnet of the first surface, every two adjacent first surface are connected by a second surface.
Implement the present invention, the amount of leakage of the magnetic flux by permanent magnet can be reduced, improve the revolving speed of motor, to improve The output power density of motor.
[Detailed description of the invention]
Fig. 1 is a kind of schematic diagram for motor that one embodiment of the invention provides；
Fig. 2 is the schematic diagram of the rotor of motor shown in Fig. 1；
Fig. 3 is the electrical angle of the circumferential magnetic bridge polar arc corresponding with the length of radial magnetic bridge and magnetic pole of rotor shown in Fig. 2 Schematic diagram.
[specific embodiment]
The invention will be further described with reference to the accompanying drawings and examples.
With reference to Fig. 1, a kind of motor 100 that an embodiment of the invention provides is a kind of DC brushless motor, can answer For needing to provide high-revolving equipment, such as impact wrench, high-speed fan etc..Motor 100 includes stator 10 and can determine relatively The rotor 50 of 10 rotation of son.
Stator 10 includes stator core 11 and the stator winding (being not shown on figure) for being set around stator core 11.Stator core 11 include annular yoke portion 12 and from yoke portion 12 inwards along radially-protruding several stator tooths 13.The stator winding difference It is set around several stator tooths 13.
Rotor 50 is set to the rotor magnetic core 51 of shaft and is embedded into rotor magnetic including shaft (being not shown on figure), fixing sleeve Several permanent magnets 52 in core 51.Several permanent magnets 52 make rotor magnetic core 51 circumferentially form several magnetic poles.Rotor magnetic core 51 It is housed in the space that several stator tooths 13 surround.There are air gap 14, the gaps 14 between rotor magnetic core 51 and stator core 11 Presence enable rotor magnetic core 51 relative to stator core 11 rotate.The modified outer diameter of rotor magnetic core 51 or outer radius, Specifically, in the plan view shown in figure 2, across the straight line and rotor magnetic at the center of rotor magnetic core 51 and the center of permanent magnet 52 The contour line intersection place of core 51 is the position where the maximum radius of rotor magnetic core 51.Where the least radius of rotor magnetic core 51 Position be determined as follows: determine and meet the straight line of following condition: across the center and adjacent two of rotor magnetic core 51 A permanent magnet 52 is symmetrical relative to the straight line, the straight line intersect with the contour line of rotor magnetic core 51 place be rotor magnetic core 51 most Position where minor radius.Therefore, the thickness of air gap 14 corresponding to the position where the least radius of rotor magnetic core 51 is maximum, The thickness of the corresponding air gap 14 in position where the maximum radius of rotor magnetic core 51 is minimum, to reduce leakage field.
The maximum outside diameter d of rotor magnetic core 51 is 0.55~0.65 times of 11 outer diameter D of stator core, preferably 0.55 times.This In embodiment, permanent magnet 52 is 6, along the circumferentially-spaced arrangement of rotor magnetic core 51.
In the present embodiment, the convex grey subset (the ratio between axis inductor Lq and d-axis inductance Ld) of motor 100 is greater than 1.5 less than 3, from And the output reluctance torque of motor 100 is improved, the output reluctance torque of relatively traditional motor, motor 100 can be improved 16%, Greatly improve the revolving speed of motor 100.Preferably, the convex grey subset of motor 100 is 2.
Referring to figs. 2 and 3, the permanent magnet 52 being embedded into rotor magnetic core 51 makes rotor magnetic core 51 circumferentially form several magnetic Pole.The peripheral surface of rotor magnetic core 51 is the non-cylindrical being linked to each other to form by multiple first surfaces 501 and second surface 502 Face.The corresponding permanent magnet 52 of each first surface 501, every two adjacent first surface 501 pass through a second surface 502 are connected.In the present embodiment, first surface 501 is cambered surface, and second surface 502 is generally planar, thus rotor magnetic core 51 exists There is maximum radius R, rotor magnetic core 51 has the smallest at the position of second surface 502 at the position of first surface 501 Radius r.When motor 100 is powered, because 14 thickness of air gap in the region between two adjacent permanent magnets 52 is larger (with reference to figure 1), the magnetic resistance in the region is larger, to reduce undesired magnetic leakage, is conducive to the performance for improving motor 100, is conducive to mention The high output power density of motor 100.
Rotor magnetic core 51 includes ontology 53, several magnetic pole pieces 54 and several magnetic bridge portions 55.Ontology 53 have through-hole 531 with Fixing sleeve is set to shaft.Several magnetic pole pieces 54 are looped around the periphery of ontology 53 and separate with ontology 53.
The corresponding polar arc of each magnetic pole is 120~130 electrical angles, as shown in figure 3, for example indicating electrical angle with A.This explanation In book and claims, polar arc refers to the electrical angle of the corresponding central angle of each magnetic pole of rotor 50, that is, each magnetic pole The corresponding electrical angle of the corresponding central angle in radial outside surface of corresponding permanent magnet 52.
It is connected between two neighboring magnetic pole piece 54 by a magnetic bridge portion 55, and the magnetic bridge portion 55 is connected to ontology 53.Such as This, the both ends of each magnetic pole piece 54 pass through two magnetic bridge portions 55 respectively and are connected to ontology 53.Each magnetic pole piece 54 and ontology 53 it Between be formed with cavity for accommodating a permanent magnet 52.Permanent magnet 52 is in cavity.Preferably, permanent magnet 52 is bar shaped Magnet.Each magnetic pole piece 54 includes the inner surface being bonded with a permanent magnet 52 and a first surface 501.Each The first surface 501 of magnetic pole piece 54 is cambered surface, to keep the thickness of air gap 14 smoothly varying.
The radially-outer surface in each magnetic bridge portion 55 is a second surface 502.Each magnetic bridge portion 55 includes circumferential magnetic Bridge 551 and radial magnetic bridge 552.The radially-outer surface of each circumferential direction magnetic bridge 551 is a second surface 502.Each circumferential direction Magnetic bridge 551 connects two adjacent magnetic pole pieces 54.Circumferential magnetic bridge 551 connected to it is connected to this by each radial direction magnetic bridge 552 Body 53.Preferably, circumferential magnetic bridge 551 and radial magnetic bridge 552 are mutually perpendicular to.
The length L1 of circumferential magnetic bridge 551 is 3~4 times of the length L2 of radial magnetic bridge 552, preferably 3 times, and the program can be compared with Adjacent pole is reduced well passes through the circumferential generation of magnetic bridge 551 leakage field.
Preferably, the two sides of radial magnetic bridge 552 be hollow out 553, thus reduce by magnetic flux, further reduce The amount of leakage of magnetic flux.
Above embodiments only express the preferred embodiment of the present invention, and the description thereof is more specific and detailed, but can not Therefore limitations on the scope of the patent of the present invention are interpreted as.It should be pointed out that for those of ordinary skill in the art, Without departing from the inventive concept of the premise, various modifications and improvements can be made, such as special to the difference in each embodiment Sign is combined, and these are all within the scope of protection of the present invention.

Claims (10)

1. a kind of motor, including stator and can be relative to the rotor of stator rotation；The rotor includes that shaft, fixing sleeve are set to institute The permanent magnet stating the rotor magnetic core of shaft, being embedded into the rotor magnetic core, the permanent magnet make the rotor magnetic core circumferentially Form several magnetic poles；It is characterized in that, the peripheral surface of the rotor magnetic core is mutual by multiple first surface and second surface The non-cylindrical for connecting and constituting, each corresponding permanent magnet of the first surface, every two adjacent first surface It is connected by a second surface.
2. motor according to claim 1, which is characterized in that the rotor magnetic core include ontology, several magnetic pole pieces and Several magnetic bridge portions；The ontology is sheathed on the shaft, and several magnetic pole pieces are looped around the periphery of the ontology, adjacent pole By a magnetic bridge portion connection between portion, and the magnetic bridge portion is connected to the ontology.
3. motor according to claim 2, which is characterized in that each magnetic bridge portion includes circumferential magnetic bridge and radial magnetic Bridge, each circumferential magnetic bridge connect two adjacent magnetic pole pieces；Each radial magnetic bridge is by the circumferential direction connected to it Magnetic bridge is connected to the ontology.
4. motor according to claim 3, which is characterized in that the length of the circumferential direction magnetic bridge is the length of the radial magnetic bridge 3~4 times of degree.
5. motor according to claim 2, which is characterized in that formed between each magnetic pole piece and the ontology useful In the cavity for accommodating a permanent magnet.
6. motor according to claim 5, which is characterized in that each magnetic pole piece includes showing consideration for the permanent magnetism The inner surface of conjunction and a first surface.
7. motor according to claim 5, which is characterized in that the corresponding polar arc of each permanent magnet is 120~130 electricity Angle.
8. motor according to claim 2, which is characterized in that the outer surface in each magnetic bridge portion is one described second Surface.
9. motor according to claim 1, which is characterized in that the stator includes stator core, the stator core packet The yoke portion for including annular, several stator tooths inwardly stretched out from the yoke portion；The rotor magnetic core is housed in several stator tooths In the space surrounded；The maximum outside diameter of the rotor magnetic core is 0.55~0.65 times of the stator core outer diameter.
10. a kind of electric machine assembly, including magnetic core and several permanent magnets, several permanent magnets along the magnetic core it is circumferentially distributed simultaneously It is embedded into the magnetic core, the permanent magnet makes the magnetic core circumferentially form several magnetic poles, which is characterized in that the magnetic core Peripheral surface is the non-cylindrical being linked to each other to form by multiple first surface and second surface, each first surface pair The permanent magnet is answered, every two adjacent first surface is connected by a second surface.
CN201711360080.1A 2017-12-15 2017-12-15 Motor and its electric machine assembly Pending CN109936229A (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
CN201711360080.1A CN109936229A (en) 2017-12-15 2017-12-15 Motor and its electric machine assembly
DE102018132060.4A DE102018132060A1 (en) 2017-12-15 2018-12-13 engine

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201711360080.1A CN109936229A (en) 2017-12-15 2017-12-15 Motor and its electric machine assembly

Publications (1)

Publication Number Publication Date
CN109936229A true CN109936229A (en) 2019-06-25

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ID=66675294

Family Applications (1)

Application Number Title Priority Date Filing Date
CN201711360080.1A Pending CN109936229A (en) 2017-12-15 2017-12-15 Motor and its electric machine assembly

Country Status (2)

Country Link
CN (1) CN109936229A (en)
DE (1) DE102018132060A1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112564343A (en) * 2019-07-22 2021-03-26 威刚科技股份有限公司 Rotating electric machine and rotor assembly thereof

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104300710A (en) * 2013-07-17 2015-01-21 丹佛斯（天津）有限公司 Rotor, built-in permanent magnet motor and compressor
CN204156622U (en) * 2014-11-14 2015-02-11 广东美芝制冷设备有限公司 Stator punching, motor and compressor
CN106169852A (en) * 2015-05-21 2016-11-30 德昌电机(深圳)有限公司 Brushless single phase motor and electric tool
CN106487190A (en) * 2015-09-01 2017-03-08 德昌电机(深圳)有限公司 Brushless single phase motor and electric tool
CN106972653A (en) * 2016-01-14 2017-07-21 德昌电机(深圳)有限公司 Motor and its outer magnetic core, inner magnetic core

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104300710A (en) * 2013-07-17 2015-01-21 丹佛斯（天津）有限公司 Rotor, built-in permanent magnet motor and compressor
CN204156622U (en) * 2014-11-14 2015-02-11 广东美芝制冷设备有限公司 Stator punching, motor and compressor
CN106169852A (en) * 2015-05-21 2016-11-30 德昌电机(深圳)有限公司 Brushless single phase motor and electric tool
CN106487190A (en) * 2015-09-01 2017-03-08 德昌电机(深圳)有限公司 Brushless single phase motor and electric tool
CN106972653A (en) * 2016-01-14 2017-07-21 德昌电机(深圳)有限公司 Motor and its outer magnetic core, inner magnetic core

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112564343A (en) * 2019-07-22 2021-03-26 威刚科技股份有限公司 Rotating electric machine and rotor assembly thereof

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Publication number Publication date
DE102018132060A1 (en) 2019-06-19

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Application publication date: 20190625