CN102163897A - Permanent magnetic synchronous motor structure - Google Patents
Permanent magnetic synchronous motor structure Download PDFInfo
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- CN102163897A CN102163897A CN 201110100809 CN201110100809A CN102163897A CN 102163897 A CN102163897 A CN 102163897A CN 201110100809 CN201110100809 CN 201110100809 CN 201110100809 A CN201110100809 A CN 201110100809A CN 102163897 A CN102163897 A CN 102163897A
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Abstract
The invention relates to a permanent magnetic synchronous motor structure. The permanent magnetic synchronous motor structure comprises a stator and a rotor; the rotor comprises a rotor iron core and permanent magnets which are arranged on the rotor iron core; the permanent magnets are distributed on a cross section of the rotor layer by layer; the permanent magnets in each layer comprise at least two permanent magnet sections; and a magnetic bridge is arranged between two adjacent permanent magnet sections. By the structure, a salient rate of the motor is effectively increased; because of increase of excitation area under each magnetic pole, magnetic flux for each magnetic pole is increased and magnetic load of the motor is increased, so that the power density of the motor is increased; moreover, some magnetic paths pass through the magnetic bridge between the adjacent permanent magnets, the magnetic resistance of a straight-shaft magnetic path is reduced and thus the straight-shaft inductance of the motor is increased; when the magnetic path at the magnetic bridge tends to be saturated, on the contrary, the increase of the straight-shaft magnetic conductance is inhibited, the salient rate of the motor is increased and thus the flux-weakening and speed-increasing capability of the motor is enhanced. The permanent magnetic synchronous motor has the advantages of simple structure, low cost and relatively wide application.
Description
Technical field
The present invention relates to the electrical equipment technical field, particularly machine field specifically is meant a kind of permagnetic synchronous motor structure.
Background technology
Along with becoming increasingly conspicuous of resource and environment problem, new-energy automobile has entered into people's sight gradually, becomes the research and the exploitation focus of interior each big scientific research institution of world wide and car load factory.Because the restriction of battery technology, the development of pure electric automobile and application have been subjected to certain restriction, and therefore, the hybrid vehicle between traditional fuel-engined vehicle and pure electric automobile has obtained unprecedented opportunity to develop.Power drive system is the core of hybrid vehicle, and traction electric machine wherein is as the major impetus source of automobile, and its performance directly affects vehicle performance.The Hybrid Vehicle traction electric machine requires to have broad expansion speed scope, higher power density and in whole working range between a high proportion of high efficient area.Permagnetic synchronous motor has farthest met These characteristics at many motor types, therefore becomes the first-selected type in the current power drive system application.
Because the excitation field on the permanent-magnetic synchronous motor rotor is unadjustable, when motor speed was higher, unloaded back-emf increased, when increasing to the voltage limit that controller can allow, if need further to improve rotating speed, then need to utilize stator armature to react and weaken air-gap field.But because permagnetic synchronous motor salient pole rate is lower, weak magnetic effect is just very limited, and is difficult to guarantee the torque performance of motor.
For magnetic effect a little less than improving, available technology adopting permanent magnet hierarchy, it has salient pole rate height, the advantage that torque performance is good.But simultaneously because d-axis magnetic circuit effective air gap is longer, the d-axis reactance of armature reaction is diminished, be unfavorable for the weak magnetic control system of motor, and adopt the permagnetic synchronous motor of this magnetic structure because the aggravation of magnetic circuit degree of asymmetry, cause cogging torque to increase, the vibration of motor and noise are all bigger.
Summary of the invention
The objective of the invention is to have overcome above-mentioned shortcoming of the prior art, provide a kind of, increase the salient pole rate of motor in the increase that suppresses the d-axis magnetic conductance, and then when improving the weak magnetism speed expansion ability of motor, reduce cogging torque, reduce the torque pulsation of motor, thereby improve the torque performance of motor, reduce motor oscillating and noise, effective assurance vehicle performance and driver comfort, simple in structure, with low cost, range of application is the permagnetic synchronous motor structure comparatively widely.
In order to realize above-mentioned purpose, permagnetic synchronous motor structure of the present invention has following formation:
This permagnetic synchronous motor comprises stator and rotor, has air gap between described stator and rotor, described rotor comprises rotor core and is arranged at permanent magnet on the rotor core, its main feature is, described permanent magnet distributes at the rotor cross-section higher slice, each layer permanent magnet includes at least two sections permanent magnet segment, has magnetic bridge between adjacent two sections permanent magnet segment.
In this permagnetic synchronous motor structure, described stator comprises stator tooth and stator yoke, and magnetic flux is all successively by stator tooth, stator yoke, air gap, rotor core, permanent magnet and magnetic bridge closure under the magnetic pole of described each permanent magnet segment.
In this permagnetic synchronous motor structure, described permanent magnet is a Nd-Fe-B permanent magnet.
In this permagnetic synchronous motor structure, on rotor cross-section, the permanent magnet segment width of every layer of permanent magnet successively increases from the permanent magnet layer that the permanent magnet course that is positioned at the rotor outside is positioned at the rotor inboard.
In this permagnetic synchronous motor structure, on rotor cross-section, described permanent magnet divides 3 layers of distribution at least.
Further, in this permagnetic synchronous motor structure, on rotor cross-section, described permanent magnet divides 3 layers of distribution.
In this permagnetic synchronous motor structure, every layer of permanent magnet includes at least 3 sections permanent magnet segment.
Further, in this permagnetic synchronous motor structure, every layer of permanent magnet includes 4 sections permanent magnet segment, and comprises 3 magnetic bridges that lay respectively between adjacent two sections permanent magnet segment on one deck permanent magnet altogether.
In this permagnetic synchronous motor structure, on the armature spindle tangent plane, described rotor core and the equal segmentation of permanent magnet that is arranged on the rotor core distribute.
Further, in this permagnetic synchronous motor structure, described rotor core and permanent magnet divide 4 sections distributions on the armature spindle tangent plane.
In this permagnetic synchronous motor structure, at the armature spindle butt upwards, described every section rotor core and the length that is arranged at one section permanent magnet on the rotor core are 20mm.
In this permagnetic synchronous motor structure, the armature spindle butt of two neighboring sections rotor core is to non-parallel, and forms rotor chute between the two neighboring sections rotor core.
In this permagnetic synchronous motor structure, the armature spindle butt of described adjacent two-stage rotor iron core to angle be 2.5 °.
Adopted the permagnetic synchronous motor structure of this invention, because its permanent magnet distributes at the rotor cross-section higher slice, make it can effectively improve the salient pole rate of motor, because every increase of extremely descending the excitation area, make every utmost point magnetic flux increase, the motor magnetic loading increases, improved the power density of motor, simultaneously, because its each layer permanent magnet includes at least two sections permanent magnet segment, has magnetic bridge between adjacent two sections permanent magnet segment, make the part magnetic circuit through the magnetic bridge between the adjacent permanent magnet, reduce the magnetic resistance of d-axis magnetic circuit, and then increase the d-axis inductance of motor, when the magnetic circuit at magnetic bridge place trends towards suppressing the increase of d-axis magnetic conductance again conversely when saturated, increase the salient pole rate of motor, and then improve the weak magnetism speed expansion ability of motor.Further, on the armature spindle tangent plane, the oblique electrode structure of segmentation has been adopted in this invention, be that permanent magnet is divided into plurality of sections in the axial direction, replace skewed stator slot by the certain angle of rotation inclination to form rotor chute between every adjacent two sections, reach and reduce cogging torque, and then reduce the purpose of motor oscillating and noise, guaranteed vehicle performance and driver comfort.Permagnetic synchronous motor of the present invention is simple in structure, and is with low cost, and range of application is comparatively extensive.
Description of drawings
Fig. 1 is the cross section of rotor structural representation in the permagnetic synchronous motor structure of the present invention.
Fig. 2 is the axial arrangement schematic diagram of the rotor in the permagnetic synchronous motor structure of the present invention.
Embodiment
In order more to be expressly understood technology contents of the present invention, describe in detail especially exemplified by following examples.
See also Figure 1 and Figure 2, be respectively cross section of rotor structure and axial arrangement schematic diagram in the permagnetic synchronous motor structure of the present invention.
In one embodiment, this permagnetic synchronous motor comprises stator and rotor, has air gap between described stator and rotor, as shown in Figure 2, described rotor comprises rotor core 2 and is arranged at permanent magnet 1 on the rotor core 2, and described permanent magnet 1 divides three layers of distribution on rotor cross-section, and each layer permanent magnet 1 includes four sections permanent magnet segment, have between adjacent two sections permanent magnet segment between 3, four sections permanent magnet segment of magnetic bridge and have three magnetic bridges 3 altogether.Magnetic flux under each magnetic pole is by stator tooth, stator yoke, air gap, rotor core, permanent magnet and magnetic bridge closure.The permanent magnet segment width of every layer of permanent magnet successively increases from the permanent magnet layer that the permanent magnet course that is positioned at the rotor outside is positioned at the rotor inboard.
In other embodiments, in this permagnetic synchronous motor structure, comprising permanent magnet more than four layers or four layers on the rotor cross-section.Every layer of permanent magnet includes at least three sections permanent magnet segment, and has magnetic bridge between the adjacent two sections permanent magnet segment on one deck permanent magnet.
A kind of preferred embodiment in, as shown in Figure 2, on the armature spindle tangent plane, described rotor core 2 and the permanent magnet 1 that is arranged on the rotor core 2 are divided equally four sections distributions.
In a kind of further preferred embodiment, at the armature spindle butt upwards, described every section rotor core and the length that is arranged at one section permanent magnet on the rotor core are 20mm.
In another kind of further preferred embodiment, the armature spindle butt of two neighboring sections rotor core is to non-parallel, and forms rotor chute between the two neighboring sections rotor core.
In a kind of preferred execution mode, the armature spindle butt of described adjacent two-stage rotor iron core to angle be 2.5 °.
In actual applications, it is the Nd-Fe-B permanent magnet of N33EHS that this permagnetic synchronous motor adopts the trade mark, and this Nd-Fe-B permanent magnet residual flux density in the time of 20 ℃ is 1.14T, and coercive force is 859kA/m.On the rotor cross-section aspect, permanent magnet is taked three layers topological structure, and permanent magnet is divided into four sections in each layer, forms three magnetic bridges.Therefore every magnetic flux extremely down passes through stator tooth, stator yoke, air gap, rotor core, permanent magnet and magnetic bridge closure.Magnetic bridge has reduced direct axis reluctance on the one hand as the part of d-axis magnetic circuit, has increased the d-axis reactance of armature reaction, on the other hand owing to the saturation effect of magnetic bridge, has increased the salient pole rate of motor.The width of each layer permanent magnet increases from outside to inside gradually, has improved every area that sends magnetic flux extremely down, helps the raising of power of motor density.On the axial section, with total length is the permanent magnet that the permanent magnet of 80mm is divided into 4 sections 20mm, accordingly rotor core is divided into length and is four sections of 20mm, after permanent magnet is respectively charged into four iron leg cores according to topological structure shown in Figure 1, be assemblied on the axle to differ 2.5 ° of mechanical angles separately, to realize that rotor chute replaces skewed stator slot, reduce cogging torque with this, improve because the torque ripple that the multilayer segmental structure brings.
Adopted the permagnetic synchronous motor structure of this invention, because its permanent magnet distributes at the rotor cross-section higher slice, make it can effectively improve the salient pole rate of motor, because every increase of extremely descending the excitation area, make every utmost point magnetic flux increase, the motor magnetic loading increases, improved the power density of motor, simultaneously, because its each layer permanent magnet includes at least two sections permanent magnet segment, has magnetic bridge between adjacent two sections permanent magnet segment, make the part magnetic circuit through the magnetic bridge between the adjacent permanent magnet, reduce the magnetic resistance of d-axis magnetic circuit, and then increase the d-axis inductance of motor, when the magnetic circuit at magnetic bridge place trends towards suppressing the increase of d-axis magnetic conductance again conversely when saturated, increase the salient pole rate of motor, and then improve the weak magnetism speed expansion ability of motor.Further, on the armature spindle tangent plane, the oblique electrode structure of segmentation has been adopted in this invention, be that permanent magnet is divided into plurality of sections in the axial direction, replace skewed stator slot by the certain angle of rotation inclination to form rotor chute between every adjacent two sections, reach and reduce cogging torque, and then reduce the purpose of motor oscillating and noise, guaranteed vehicle performance and driver comfort.Permagnetic synchronous motor of the present invention is simple in structure, and is with low cost, and range of application is comparatively extensive.
In this specification, the present invention is described with reference to its certain embodiments.But, still can make various modifications and conversion obviously and not deviate from the spirit and scope of the present invention.Therefore, specification and accompanying drawing are regarded in an illustrative, rather than a restrictive.
Claims (13)
1. permagnetic synchronous motor structure, this permagnetic synchronous motor comprises stator and rotor, has air gap between described stator and rotor, described rotor comprises rotor core and is arranged at permanent magnet on the rotor core, it is characterized in that, described permanent magnet distributes at the rotor cross-section higher slice, and each layer permanent magnet includes at least two sections permanent magnet segment, has magnetic bridge between adjacent two sections permanent magnet segment.
2. according to claim 1, it is characterized in that described stator comprises stator tooth and stator yoke, magnetic flux is all successively by stator tooth, stator yoke, air gap, rotor core, permanent magnet and magnetic bridge closure under the magnetic pole of described each permanent magnet segment.
3. according to claim 1, it is characterized in that described permanent magnet is a Nd-Fe-B permanent magnet.
4. permagnetic synchronous motor structure according to claim 1 is characterized in that, on rotor cross-section, the permanent magnet segment width of every layer of permanent magnet successively increases from the permanent magnet layer that the permanent magnet course that is positioned at the rotor outside is positioned at the rotor inboard.
5. according to each described permagnetic synchronous motor structure in the claim 1 to 4, it is characterized in that on rotor cross-section, described permanent magnet divides 3 layers of distribution at least.
6. permagnetic synchronous motor structure according to claim 5 is characterized in that, on rotor cross-section, described permanent magnet divides 3 layers of distribution.
7. permagnetic synchronous motor structure according to claim 5 is characterized in that, every layer of permanent magnet includes at least 3 sections permanent magnet segment.
8. permagnetic synchronous motor structure according to claim 7 is characterized in that, every layer of permanent magnet includes 4 sections permanent magnet segment, and comprises 3 magnetic bridges that lay respectively between adjacent two sections permanent magnet segment on one deck permanent magnet altogether.
9. permagnetic synchronous motor structure according to claim 5 is characterized in that, on the armature spindle tangent plane, described rotor core and the equal segmentation of permanent magnet that is arranged on the rotor core distribute.
10. permagnetic synchronous motor structure according to claim 9 is characterized in that, described rotor core and permanent magnet divide 4 sections distributions on the armature spindle tangent plane.
11. permagnetic synchronous motor structure according to claim 10 is characterized in that, at the armature spindle butt upwards, described every section rotor core and the length that is arranged at one section permanent magnet on the rotor core are 20mm.
12. permagnetic synchronous motor structure according to claim 9 is characterized in that, the armature spindle butt of two neighboring sections rotor core is to non-parallel, and forms rotor chute between the two neighboring sections rotor core.
13. permagnetic synchronous motor structure according to claim 12 is characterized in that, the armature spindle butt of described adjacent two-stage rotor iron core to angle be 2.5 °.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201110100809 CN102163897A (en) | 2011-04-21 | 2011-04-21 | Permanent magnetic synchronous motor structure |
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| Application Number | Priority Date | Filing Date | Title |
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| CN 201110100809 CN102163897A (en) | 2011-04-21 | 2011-04-21 | Permanent magnetic synchronous motor structure |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103472313A (en) * | 2013-09-29 | 2013-12-25 | 哈尔滨工业大学 | Permanent magnet synchronous motor alternating current and direct current shaft inductance testing method giving consideration to saturation situation |
| CN104410234A (en) * | 2014-04-17 | 2015-03-11 | 西北工业大学 | Spindle synchronous motor with wide speed regulation range for lathe |
| CN107196433A (en) * | 2017-05-25 | 2017-09-22 | 华中科技大学 | A kind of device, magneto and method for reducing cogging torque of permanent magnet motor |
| CN107546894A (en) * | 2017-10-19 | 2018-01-05 | 哈尔滨理工大学 | A kind of high speed permanent magnet motor rotor structure |
| CN108321950A (en) * | 2018-03-09 | 2018-07-24 | 哈尔滨理工大学 | A kind of high-speed permanent magnetic body synchronous motor rotor structure |
| CN110729833A (en) * | 2019-09-27 | 2020-01-24 | 珠海格力电器股份有限公司 | Motor rotor and synchronous reluctance motor |
| CN110829751A (en) * | 2019-09-29 | 2020-02-21 | 浙江合众新能源汽车有限公司 | Method and system for optimizing efficiency of permanent magnet synchronous motor of electric vehicle |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201352753Y (en) * | 2008-11-25 | 2009-11-25 | 苏州工业园区和鑫电器有限公司 | Novel internal permanent magnet synchronous motor |
| CN101771315A (en) * | 2008-12-09 | 2010-07-07 | 通用汽车环球科技运作公司 | Method and apparatus for permanent magnet machine with segmented ferrite magnets |
-
2011
- 2011-04-21 CN CN 201110100809 patent/CN102163897A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201352753Y (en) * | 2008-11-25 | 2009-11-25 | 苏州工业园区和鑫电器有限公司 | Novel internal permanent magnet synchronous motor |
| CN101771315A (en) * | 2008-12-09 | 2010-07-07 | 通用汽车环球科技运作公司 | Method and apparatus for permanent magnet machine with segmented ferrite magnets |
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103472313A (en) * | 2013-09-29 | 2013-12-25 | 哈尔滨工业大学 | Permanent magnet synchronous motor alternating current and direct current shaft inductance testing method giving consideration to saturation situation |
| CN103472313B (en) * | 2013-09-29 | 2015-07-08 | 哈尔滨工业大学 | Permanent magnet synchronous motor alternating current and direct current shaft inductance testing method giving consideration to saturation situation |
| CN104410234A (en) * | 2014-04-17 | 2015-03-11 | 西北工业大学 | Spindle synchronous motor with wide speed regulation range for lathe |
| CN107196433A (en) * | 2017-05-25 | 2017-09-22 | 华中科技大学 | A kind of device, magneto and method for reducing cogging torque of permanent magnet motor |
| CN107196433B (en) * | 2017-05-25 | 2019-09-27 | 华中科技大学 | A kind of device, magneto and method reducing cogging torque of permanent magnet motor |
| CN107546894A (en) * | 2017-10-19 | 2018-01-05 | 哈尔滨理工大学 | A kind of high speed permanent magnet motor rotor structure |
| CN108321950A (en) * | 2018-03-09 | 2018-07-24 | 哈尔滨理工大学 | A kind of high-speed permanent magnetic body synchronous motor rotor structure |
| CN110729833A (en) * | 2019-09-27 | 2020-01-24 | 珠海格力电器股份有限公司 | Motor rotor and synchronous reluctance motor |
| CN110729833B (en) * | 2019-09-27 | 2021-08-31 | 珠海格力电器股份有限公司 | Motor rotor and synchronous reluctance motor |
| CN110829751A (en) * | 2019-09-29 | 2020-02-21 | 浙江合众新能源汽车有限公司 | Method and system for optimizing efficiency of permanent magnet synchronous motor of electric vehicle |
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Application publication date: 20110824 |