CN105896772A - Rotor core of magnetic-flux variable permanent magnet synchronous motor - Google Patents
Rotor core of magnetic-flux variable permanent magnet synchronous motor Download PDFInfo
- Publication number
- CN105896772A CN105896772A CN201610290627.4A CN201610290627A CN105896772A CN 105896772 A CN105896772 A CN 105896772A CN 201610290627 A CN201610290627 A CN 201610290627A CN 105896772 A CN105896772 A CN 105896772A
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- Prior art keywords
- lamination
- rotor core
- magnetic
- type
- permanent magnet
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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
- H02K1/22—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
- H02K1/02—Details of the magnetic circuit characterised by the magnetic material
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Permanent Field Magnets Of Synchronous Machinery (AREA)
- Iron Core Of Rotating Electric Machines (AREA)
Abstract
The invention discloses a rotor core of a magnetic-flux variable permanent magnet synchronous motor. The rotor core is composed through overlaying of rotor core laminations, wherein the rotor core laminations comprise first-type laminations and second-type laminations; each first-type lamination has an annular structure, multiple magnetic steel embedding gaps which do not form fractures on outer edges are distributed and disposed in the circumferential direction and are used to form an installation groove of a magnetic steel body, and a first magnetic isolation hole which does not form a fracture on the outer edge of the first-type lamination is also disposed between every two magnetic steel embedding gaps; and the second-type laminations are similar with the first-type laminations and are different in that the second-type laminations form gaps in the outer edges. The rotor core disclosed by the invention is characterized in that magnetic steel brow leakage is reduced through breaking of a magnetic bridge between magnetic steel ends and the rotor outer diameter, so that magnetization currents are reduced, and a torque density is increased; and through breaking of a magnetic bridge between a quadrature-axis magnetic isolation groove and the rotor outer diameter, quadrature-axis inductance can be reduced and direct-axis inductance exceeds the quadrature-axis inductance, so that positive reluctance torque is obtained, and the torque density is increased.
Description
Technical field
The invention belongs to machine field, become turning of flux permanent magnet synchronous motor more particularly, to a kind of
Son is unshakable in one's determination.
Background technology
New-energy automobile drives motor many employings internal permanent magnet synchronous motor (IPMSM) in recent years,
This motor has the advantage that power density is high, mechanical property is good, the range of speeds is higher, at electric automobile
Drive system obtains pay close attention to widely and apply.But internal permanent magnet synchronous motor d-axis inductance
Typically smaller than quadrature axis inductance, for utilizing reluctance torque and realizing weak magnetic control, current locus is positioned at second
Quadrant, electric current contains weak magnetic component all the time, thus additionally increase loss and magnet steel utilization rate are relatively low.
Additionally motor is after entering into high speed stage, in addition it is also necessary to by increasing d-axis demagnetizing current component to motor
Carrying out weak magnetic, to control the motor terminal voltage limit value less than contravarianter voltage, the biggest is weak
Magnetoelectricity stream makes the copper loss of motor increase, and causes the efficiency of motor to reduce, and due to inverter power
The restriction of grade, electric current also has a limit value, causes the weak magnetic degree of motor to be restricted, speed
Adjustable extent is narrow.
High remanent magnetism, low-coercivity, resistant to elevated temperatures samarium cobalt permanent magnet body and Al-Ni-Co permanent magnet have and are prone to
Fill the characteristic of demagnetization so that the magnetization degree of on-line control permanent magnet is possibly realized.Therefore, Yi Zhongxin
The change flux permanent magnet synchronous motor structure of type is suggested, such as periodical literature (V.Ostovic, " Memory motors:
A new class of controllable flux PM machines for a true wide speed operation ", IEEE Industry
Applications Conference Record, vol.4, pp.2577-2584 (2001)): by stator direct-axis current arteries and veins
Rush vector controlled, change the intensity of magnetization of permanent magnet material online with the narrowest pulse current, according in real time
The fan-out capability of Operating condition adjustment permanent-magnet torque, i.e. when low rate start, magnetizes completely to magnet steel, expands
Torque range, reduces magnet steel magnetization degree during high speed, it is not necessary to or only realize with a small amount of direct-axis current component
Weak magnetic control.Therefore, this speed governing form changing the magnet steel intensity of magnetization with pulse current online, can
At utmost to reduce weak magnetoelectricity flow component, improve the overall efficiency of motor.
Become in magnetic flow permanent magnet motor the maximum that magnet steel is magnetized the completely electric current that magnetizes and directly affect frequency conversion
The current limit value of device, and the product that the peak power of converter is current limit value and voltage limit,
Therefore the maximum electric current that magnetizes affects the capacitance grade of converter, therefore reduces the leakage field of magnetic circuit to reduce maximum
The electric current that magnetizes is necessary.It addition, this type of motor utilizes the permanent magnet material of low-coercivity, motor exports
Performance is more relatively low than common magneto, therefore need to take measures to improve the torque density of motor.
Summary of the invention
For disadvantages described above or the Improvement requirement of prior art, the invention provides a kind of reduction and become magnetic flux
Permagnetic synchronous motor magnetizes electric current the method improving its torque density and the preparation side of rotor core molding
Method, its object is to provide a kind of rotor core becoming flux permanent magnet synchronous motor, it is characterised in that
Described rotor core is formed by stacking by rotor core lamination, and described rotor core lamination includes the first kind
Lamination and Second Type lamination, during superposition forms described rotor core, the described first kind
Lamination and described Second Type lamination are crisscross arranged；
Wherein, described first kind lamination is circular ring, and it is distributed in a circumferential direction and is provided with
Some magnet steel not forming fracture in outer embed breach, for forming the mounting groove of magnet steel, described
Two magnet steel embed to be additionally provided with between breach and do not form the of fracture in described first kind lamination outer
One every Ci Kou；
Described Second Type lamination is circular ring, its be distributed in a circumferential direction be provided with some
Outer forms the magnet steel of fracture and embeds breach, for forming the mounting groove of magnet steel, said two magnet steel
Embed and be additionally provided with form fracture in described first kind lamination outer first between breach every Ci Kou.
Further, on described first kind lamination with described Second Type lamination, also there is symmetry
It is distributed in described magnet steel and embeds the second quadrature axis magnetic circuit along d-axis magnetic linkage direction of breach (2) both sides every magnetic
Mouthful.
Further, described second quadrature axis magnetic circuit is arranged at described parallel arrangement in the radial direction every magnetic mouth
Multiple.
Further, during described first kind lamination and described Second Type lamination are crisscross arranged, described
The Part I of first kind lamination multiple superposition formation is multiple with described Second Type lamination superposes formation
Part II be crisscross arranged, described Second Type number of laminations be more than described first kind number of laminations
Further, described Second Type number of laminations is 4:1 with the ratio of described first kind number of laminations.
Further, described second quadrature axis magnetic circuit is utilized axially to wear to make non-magnetic fixture every magnetic mouth
Through hole, it is achieved described lamination is fixing rotor axial.
In general, by the contemplated above technical scheme of the present invention compared with prior art, it is possible to
Obtain following beneficial effect:
The present invention use the stalloy of two kinds of topological structure to be combined superposition, one of which lamination
Topological structure can reduce magnet steel brow leakage to a great extent, thus reduce the electric current that magnetizes, and
Improve torque density；The topological structure of another set lamination can increase quadrature-axis reluctance, reduces quadrature axis electricity
Sense, thus increase reluctance torque, improve torque density；Laminate to realize by two kinds of silicon steel laminations combinations
The method of rotor core molding, manufactures work than additionally increasing sleeve with the conventional method of fixed rotor lamination
Skill is simple, it is to avoid increase the problem that sleeve is brought, such as sleeve exists eddy current so that loss
Increasing, increase sleeve and make gas length become big, magnetic circuit reluctance becomes big, reduces the fan-out capability of motor.
And utilize the through hole that the space of quadrature axis magnetic separate slot wears as non-magnetic fixture cleverly, it is to avoid
Additionally do the through hole impact on rotor magnetic circuit.
Accompanying drawing explanation
Fig. 1 is the structural representation of the lamination one realized according to the present invention；
Fig. 2 is the structural representation of the lamination two realized according to the present invention；
Fig. 3 is to form the structure of rotor core after the rotor core silicon steel plate stacking realized according to the present invention
Schematic diagram.
In all of the figs, identical reference is used for representing identical element or structure, wherein:
Between 1-rotor core stalloy 2-magnet steel mouth 3-quadrature axis magnetic circuit magnet isolation tank and rotor diameter
Magnetic bridge 4,5,6-quadrature axis magnetic circuit magnetic bridge 8-between magnetic mouth 7-magnet steel end and rotor diameter
Quadrature axis magnetic circuit magnetic bridge open circuit 9-magnet steel end between magnetic bridge groove and rotor diameter and rotor diameter it
Between magnetic bridge open circuit 10, the combinative structure 11 of 12-lamination one, the combinative structure of 13-lamination two
14,15-rivets
Detailed description of the invention
In order to make the purpose of the present invention, technical scheme and advantage clearer, below in conjunction with accompanying drawing
And embodiment, the present invention is further elaborated.Should be appreciated that described herein specifically
Embodiment only in order to explain the present invention, is not intended to limit the present invention.Additionally, it is disclosed below
Just may be used as long as technical characteristic involved in each embodiment of the present invention does not constitutes conflict each other
To be mutually combined.
As it is shown in figure 1, be the electricity that magnetizes reducing change flux permanent magnet synchronous motor realized according to the present invention
Flow and improve the structural representation of lamination one the most improved in the rotor core 1 of torque density, permissible
Finding out, its primary structure is: rotor core stalloy 1, and magnet steel embeds breach 2, for folding
Can form cell body after adding thus accommodate magnet steel, selecting magnet steel in the present invention is cutting orientation magnetizing direction,
And employing has the permanent magnet material of low-coercivity to make above-mentioned magnet steel, by stator direct-axis current pulse
Vector controlled realizes filling demagnetization.
Wherein, it is additionally provided with between magnet steel embedding breach 2 not at the first of lamination outer formation fracture
Every magnetic mouth 4, it primarily forms quadrature axis magnetic circuit magnet isolation tank, and first does not breaks between magnetic mouth 4 and rotor diameter
The part of mouth is referred to as magnetic bridge 3, and it is the main thoroughfare of quadrature axis magnetic linkage, therefore its width, length the most radially
Degree directly affects the magnetic resistance of quadrature axis magnetic circuit, thus affects quadrature axis inductance, and magnetic bridge 3 width is the least,
The magnetic resistance of quadrature axis magnetic circuit is the biggest, inductance is the least, if therefore magnetic bridge 3 is fully disconnected in circumferential direction,
Quadrature axis magnetic circuit can be made to be blocked completely, and magnetic circuit reluctance is maximum.
It addition, except arranging first every magnetic mouth 4, also on the camber line with radial direction as normal, symmetrical
It is arranged on magnet steel and embeds the second quadrature axis magnetic circuit of breach 2 both sides every magnetic mouth 5,6, and this second quadrature axis
Magnetic circuit can be arranged in parallel multiple along radial direction is derivative every magnetic mouth, thus can increase quadrature axis magnetic circuit
Magnetic resistance is to reduce quadrature axis inductance, so that quadrature axis inductance is less than d-axis inductance；
The part that magnet steel embeds between breach 2 end and the non-fracture of rotor diameter is magnetic bridge 7, for magnet steel end
The major influence factors of portion's leakage field, and leakage field is produced when magnet steel magnetizes, cause electric current increase of magnetizing.
Further, as in figure 2 it is shown, in order to reduce become flux permanent magnet synchronous motor magnetize electric current and
Quadrature axis inductance, the method that can take to be fully disconnected 3 and 7, as shown in 8 and 9, disconnect 7 permissible
Cut off the leakage field magnetic circuit of magnet steel end, thus reduce magnet steel brow leakage, on the one hand so that unloaded
Air gap flux density increases, and improves torque density, on the other hand avoids pulsed magnetic field and magnetizes magnet steel
Shi Fasheng magnet steel brow leakage, so that the current reduction that magnetizes；Disconnecting 3 can be by complete for quadrature axis magnetic circuit
Full blocking-up so that quadrature-axis reluctance increases, quadrature axis inductance reduces, thus increases trochiterian salient pole ratio, increases
Big reluctance torque.
It addition, above two lamination is to produce rotor core, silicon steel sheet stack as follows
Pressure method is as it is shown on figure 3,10 and 12 be wherein the structure that lamination one laminates composition, and 11 and 13 is four
The combinative structure of sheet lamination two, has described above understanding, and less for the electric current that makes to magnetize, torque density is relatively
Height, can the quantity of lamination one be the smaller the better, but be accounted for bearing the mechanically stressed of rotor simultaneously,
Therefore the present invention considers axial length unshakable in one's determination, motor electromagnetic performance and mechanically stressed situation, will be folded
Sheet one is preferably arranged to 1:4 with the quantitative proportion of lamination two, and in order to make lamination in the axial direction
Uniform force, places lamination one with lamination two interleaved, such as 10, and the position shown in 11,12,13
Put relation.
By the when of fixing for the combination of the whole lamination combined, non-magnetic can be adopted as
The rivet 14,15 that material is made, the shape of cross section is identical every the shape of magnetic mouth 6 with Fig. 1, and
Through every magnetic mouth 6.Lamination one is combined shown in Fig. 3 by the present invention with lamination two, then passes through
With 14 in Fig. 3, eight parts of lamination two are carried out axially solid with lamination one by 15 eight identical rivets
Fixed, the molding of rotor core can be realized.
When each part of lamination two is overlapped together with lamination one by rivet, due to lamination one
It is an entirety being perpendicular in axial dimension, and each part to lamination two in this dimension
There is an identical active force, therefore scattered eight parts of lamination two have just become of relative invariant position whole
Body, it is achieved thereby that the molding of rotor core.In the present invention as a example by two kinds of number of laminations are than 1:4,
Depending on this ratio can be according to practical situation, such as rotor core axial length and the thickness of stalloy,
And the mechanically stressed situation of rotor etc..
The topological structure becoming flux permanent magnet synchronous motor realized according to the present invention, it is possible to realize following
Technical advantage: the topological structure of lamination two can reduce magnet steel brow leakage to a great extent, thus
Reduce the electric current that magnetizes, reduce the capacitance grade of inverter, and improve torque density；Additionally can increase
Quadrature-axis reluctance, reduces quadrature axis inductance, thus increases salient pole ratio, increases reluctance torque；By two kinds of silicon steel
Sheet combination laminates the method realizing rotor core molding, and ratio additionally increases sleeve with fixed rotor lamination
Conventional method manufacturing process simple, it is to avoid increase the problem that sleeve is brought, and profit cleverly
It is used as the through hole that non-magnetic fixture wears, it is to avoid additionally do through hole with the space of quadrature axis magnetic separate slot
Impact on rotor magnetic circuit.
As it will be easily appreciated by one skilled in the art that and the foregoing is only presently preferred embodiments of the present invention,
Not in order to limit the present invention, all made within the spirit and principles in the present invention any amendment, etc.
With replacement and improvement etc., within being all contained in protection scope of the present invention.
Claims (6)
1. the rotor core becoming flux permanent magnet synchronous motor, it is characterised in that described rotor core
Being formed by stacking by rotor core lamination, described rotor core lamination includes first kind lamination and Equations of The Second Kind
Type lamination, during superposition forms described rotor core lamination, described first kind lamination and institute
State Second Type lamination to be crisscross arranged；
Wherein, described first kind lamination is circular ring, and it is distributed in a circumferential direction and is provided with
Some magnet steel not forming fracture in outer embed breach (2), for forming the mounting groove of magnet steel,
Said two magnet steel embeds to be additionally provided with between breach (2) and is not formed in described first kind lamination outer
The first of fracture is every Ci Kou (4)；
Described Second Type lamination is circular ring, its be distributed in a circumferential direction be provided with some
Outer forms the magnet steel of fracture and embeds breach (2), for forming the mounting groove of magnet steel, said two
Magnet steel embeds to be additionally provided with between breach (2) and forms the first of fracture in described first kind lamination outer
Every Ci Kou (4).
2. the rotor core becoming flux permanent magnet synchronous motor as claimed in claim 1, it is characterised in that
On described first kind lamination with described Second Type lamination, also have and be symmetrically distributed in described magnet steel
Embed the second quadrature axis magnetic circuit along d-axis magnetic linkage direction of breach (2) both sides every Ci Kou.
3. the rotor core becoming flux permanent magnet synchronous motor as claimed in claim 2, it is characterised in that
Described second quadrature axis magnetic circuit arranges multiple (5,6) every magnetic mouth at described parallel arrangement in the radial direction.
4. the rotor core becoming flux permanent magnet synchronous motor as described in any one in claim 1-3,
It is characterized in that, described first kind lamination and described Second Type lamination interlock during superposition arranges, institute
State the Part I that the multiple superposition of first kind lamination formed and multiple with described Second Type lamination superpose shape
The Part II become is crisscross arranged.
5. the rotor core becoming flux permanent magnet synchronous motor as claimed in claim 4, it is characterised in that
Described Second Type number of laminations is 4:1 with the ratio of described first kind number of laminations.
6. the rotor core becoming flux permanent magnet synchronous motor as claimed in claim 5, it is characterised in that
Utilize described second quadrature axis magnetic circuit every magnetic mouth to make the through hole that non-magnetic fixture axially wears, it is achieved institute
State lamination fixing at rotor axial.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610290627.4A CN105896772B (en) | 2016-05-05 | 2016-05-05 | A kind of rotor core becoming flux permanent magnet synchronous motor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610290627.4A CN105896772B (en) | 2016-05-05 | 2016-05-05 | A kind of rotor core becoming flux permanent magnet synchronous motor |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN105896772A true CN105896772A (en) | 2016-08-24 |
| CN105896772B CN105896772B (en) | 2019-01-04 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610290627.4A Expired - Fee Related CN105896772B (en) | 2016-05-05 | 2016-05-05 | A kind of rotor core becoming flux permanent magnet synchronous motor |
Country Status (1)
| Country | Link |
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| CN (1) | CN105896772B (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110611386A (en) * | 2019-10-10 | 2019-12-24 | 珠海格力节能环保制冷技术研究中心有限公司 | Motor rotor, motor and compressor |
| CN116827014A (en) * | 2023-06-21 | 2023-09-29 | 浙江大学 | Magnetic bridge type rotor structure for synchronous motor |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1233876A (en) * | 1998-12-09 | 1999-11-03 | 宁波东方通用电气公司西安分公司 | Brushless DC electric lift motor structure having rare-earth permanent-manget |
| TW427047B (en) * | 1999-02-26 | 2001-03-21 | Adlee Powertronic Co Ltd | High efficiency permanent magnetic motor for high speed and heavy load |
| CN103441592A (en) * | 2013-08-12 | 2013-12-11 | 浙江大学 | Novel magnetic flux adjustable permanent magnet synchronous motor |
| CN104079092A (en) * | 2014-06-24 | 2014-10-01 | 广东威灵电机制造有限公司 | Rotor core and motor with same |
| CN104205571A (en) * | 2012-02-10 | 2014-12-10 | Ksb股份公司 | Rotor and reluctance motor |
-
2016
- 2016-05-05 CN CN201610290627.4A patent/CN105896772B/en not_active Expired - Fee Related
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1233876A (en) * | 1998-12-09 | 1999-11-03 | 宁波东方通用电气公司西安分公司 | Brushless DC electric lift motor structure having rare-earth permanent-manget |
| TW427047B (en) * | 1999-02-26 | 2001-03-21 | Adlee Powertronic Co Ltd | High efficiency permanent magnetic motor for high speed and heavy load |
| CN104205571A (en) * | 2012-02-10 | 2014-12-10 | Ksb股份公司 | Rotor and reluctance motor |
| CN103441592A (en) * | 2013-08-12 | 2013-12-11 | 浙江大学 | Novel magnetic flux adjustable permanent magnet synchronous motor |
| CN104079092A (en) * | 2014-06-24 | 2014-10-01 | 广东威灵电机制造有限公司 | Rotor core and motor with same |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110611386A (en) * | 2019-10-10 | 2019-12-24 | 珠海格力节能环保制冷技术研究中心有限公司 | Motor rotor, motor and compressor |
| CN116827014A (en) * | 2023-06-21 | 2023-09-29 | 浙江大学 | Magnetic bridge type rotor structure for synchronous motor |
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| CN105896772B (en) | 2019-01-04 |
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