CN204156618U - Brushless electric machine - Google Patents
Brushless electric machine Download PDFInfo
- Publication number
- CN204156618U CN204156618U CN201420492211.7U CN201420492211U CN204156618U CN 204156618 U CN204156618 U CN 204156618U CN 201420492211 U CN201420492211 U CN 201420492211U CN 204156618 U CN204156618 U CN 204156618U
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- electric machine
- rotor
- brushless electric
- stator
- permanent magnet
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Abstract
The utility model is applicable to technical field of motors, provides a kind of brushless electric machine, is intended to solve the technical problem how reducing cogging torque on the basis keeping motor size.This brushless electric machine comprises rotor and is arranged at the stator outside rotor, and stator comprises shell, the stator core be arranged in shell, be set around the iron core winding on stator core and be installed on the end cap of openend of shell; Rotor comprises the rotating shaft be rotationally connected with on stator, be fixedly installed in the rotor core in rotating shaft and be fixedly installed on rotor core excircle and around the permanent magnet poles inside stator core; Stator core comprises the yoke portion of annular and inwardly stretches out from yoke portion and be arranged with the teeth portion of iron core winding, and teeth portion and yoke portion splice.Utilize the eccentric structure of stator core, to reduce the cogging torque of this brushless electric machine.
Description
Technical field
The utility model belongs to technical field of motors, particularly relates to a kind of brushless electric machine.
Background technology
At present for driving air throttle of car motor to mainly contain permanent magnet DC motor and stepping motor.Step motor control precision is not high, and permanent magnet DC motor easily produces electric spark and charcoal ash, and useful life is limited, needs periodic replacement.Brushless electric machine has good controllability, wide speed regulating range, does not have brush and the commutator's spark, wear problem, has higher reliability, long working life, without the need to frequent maintenance.But because brushless electric machine has permanent magnet, cause there is cogging torque in brushless electric machine, but larger cogging torque easily causes velocity perturbation, the vibration of motor and noise, particularly more obvious under underload and the slow-speed of revolution.
Utility model content
The purpose of this utility model is to provide a kind of brushless electric machine, is intended to solve the technical problem how reducing cogging torque on the basis keeping motor size.
The utility model realizes like this, a kind of brushless electric machine, comprise rotor and be arranged at the stator outside described rotor, described stator comprises shell, the stator core be arranged in described shell, be set around the iron core winding on described stator core and be installed on the end cap of openend of described shell; Described rotor comprises the rotating shaft be rotationally connected with on described stator, be fixedly installed in the rotor core in described rotating shaft and be fixedly installed on described rotor core excircle and around the permanent magnet poles inside described stator core; Described stator core comprises the yoke portion of annular and inwardly stretches out from described yoke portion and be arranged with the teeth portion of described iron core winding, and described teeth portion and described yoke portion splice.
Further, described teeth portion comprises the middle part of iron core winding described in winding and is positioned at the end of both sides, described middle part, and described end is less than the thickness at described middle part in the thickness of described stator radial direction.
Further, the center of circle in described end, described middle part and described yoke portion is that decentraction is arranged.
Further, described in each, iron core winding correspondence is set around a described teeth portion, and adopts Y-connection mode to be set around described teeth portion.
Further, form radial air gap between each described permanent magnet poles and described stator core, described radial air gap is uneven setting along the thickness of the circumferencial direction of described rotor.
Further, each described permanent magnet poles has towards the inner surface of described rotor core and in described inner surface relatively and towards the outer surface of described stator core, the inner surface of each described permanent magnet poles is arc surface, and its outer surface is arc surface.
Further, each described permanent magnet poles is formed by permanent magnet, and along described rotor circumference adjacent two described in be formed with gap between permanent magnet poles.
The utility model relative to the technique effect of prior art is: utilize ring-shaped yoke portion and teeth portion to be spliced to form stator core, to reduce the width of rebate of its coiling difficulty and reduction stator, and adopting the structure of stator core bias, two aspects reduce the cogging torque of this brushless electric machine simultaneously.
Accompanying drawing explanation
Fig. 1 is the stereogram of the brushless electric machine that the utility model provides;
Fig. 2 is the three-dimensional structure diagram of the stator of brushless electric machine in Fig. 1;
Fig. 3 is the sectional view of the stator of brushless electric machine in Fig. 1;
Fig. 4 is the sectional view of the stator of brushless electric machine in Fig. 1, and expression teeth portion is eccentric structure;
Fig. 5 is the three-dimensional structure diagram of the rotor of brushless electric machine in Fig. 1;
Fig. 6 is the sectional view of the rotor of brushless electric machine in Fig. 1.
Embodiment
In order to make the purpose of this utility model, technical scheme and advantage clearly understand, below in conjunction with drawings and Examples, the utility model is further elaborated.Should be appreciated that specific embodiment described herein only in order to explain the utility model, and be not used in restriction the utility model.
Please refer to Fig. 1 to Fig. 5, the brushless electric machine that the utility model embodiment provides comprises rotor 10 and is arranged at the stator 20 outside described rotor 10, and described stator 20 comprises shell 22, the stator core 24 be arranged in described shell 22, be set around the iron core winding 26 on described stator core 24 and be installed on the end cap 28 of openend of described shell 22; Described rotor 10 comprises the rotating shaft 12 be rotationally connected with on described stator 20, be fixedly installed in the rotor core 14 in described rotating shaft 12 and be fixedly installed on described rotor core 14 excircle and around the permanent magnet poles 16 inside described stator core 24; Described stator core 24 comprises the yoke portion 240 of annular and inwardly stretches out from described yoke portion 240 and be arranged with the teeth portion 242 of described iron core winding 26, and described teeth portion 242 is spliced with described yoke portion 240.
In this embodiment, described yoke portion 240 is corresponding with described teeth portion 242 to be arranged and quantity is equal, and the quantity in described teeth portion 242 and described yoke portion 240 is 6.Described yoke portion 240 is arranged between described shell 22 and described teeth portion 242, described teeth portion 242 is along the circumferential spaced set in described yoke portion 240, and between adjacent two teeth portion 242, being formed with the winding slot 244 of accommodating described iron core winding 26, the described iron core winding 26 being wound in each described teeth portion 242 is distributed in corresponding winding slot 244.Described iron core winding 26 corresponding with described teeth portion 242 is arranged and its quantity is equal with the quantity of described teeth portion 242.By described teeth portion 242 is spliced to form described stator core 24 with described yoke portion 240, can width of rebate be substantially reduced, thus reduce coiling difficulty and cogging torque.
The brushless electric machine that the utility model embodiment provides is inner rotor type motor, when this brushless electric machine is energized, rotates under described permanent magnet poles 16 and the electromagnetic induction of described iron core winding 26.This brushless electric machine utilizes ring-shaped yoke portion 240 and teeth portion 242 to be spliced to form stator core 24, to reduce the slot opening of this brushless electric machine, thus reduces the cogging torque of this brushless electric machine, and reduces its coiling difficulty simultaneously.
Please refer to Fig. 2 to Fig. 4, further, described teeth portion 242 comprises the middle part 246 of iron core winding 26 described in winding and is positioned at the end 248 of both sides, described middle part 246, and described end 248 is less than the thickness at described middle part 246 in the thickness of described stator 20 radial direction.Understandably, the middle part 246 of described teeth portion 242 is utilized to be thicker than its both ends 248, under the prerequisite not changing rotor 10 size, radial air gap (not shown) between the stator 20 of this brushless electric machine and rotor 10 is non-homogeneous setting along the circumference of described teeth portion 242, be specially from the end of described teeth portion 242 248 to its in the middle part of 246 by thin thickening, optimize the air gap magnetic density waveform of this brushless electric machine like this, reduce cogging torque, eliminate the part electromagnetic noise of this brushless electric machine.
Please refer to Fig. 2 to Fig. 4, further, described end 248, described middle part 246 are that decentraction is arranged with the center of circle in described yoke portion 240.Understandably, the center of circle at the place, both ends 248 of described teeth portion 242 and the wherein center of circle at place and the center of circle in described yoke portion 240, not at same position, namely this stator 20 is eccentric structure.Utilize the eccentric structure of this stator 20 to effectively reduce the cogging torque of this brushless electric machine.
Please refer to Fig. 2 and Fig. 3, further, iron core winding 26 correspondence described in each is set around a described teeth portion 242, and adopts Y-connection mode to be set around described teeth portion 242.Each described iron core winding 26 is the centralized winding of fractional-slot, reduces the coiling difficulty of described iron core winding 26, and reduces cogging torque.
Please refer to Fig. 5, further, form radial air gap (not shown) between each described permanent magnet poles 16 and described stator core 24, described radial air gap is uneven setting along the thickness of the circumferencial direction of described rotor 10.Understandably, this brushless electric machine is by being arranged at the inner side of described stator core 24 by described permanent magnet poles 16, and and form radial air gap between described stator core 24, this radial air gap is non-homogeneous setting along the circumferencial direction of described rotor 10, the radial air gap utilizing this uneven improves air gap flux density distribution, thus reduce iron loss, reduction cogging torque and torque pulsation, to reach the object of the vibration & noise reducing described brushless electric machine.Preferably, the quantity of described permanent magnet poles 16 is 4 pieces.
Described permanent magnet poles 16 is around the inner side of described teeth portion 242, to make described teeth portion 242 between described permanent magnet poles 16 and described yoke portion 240, described permanent magnet poles 16 is oppositely arranged with the end 248 of described teeth portion 242, described teeth portion 242 is by 246 being by thick thinning to its end 248 in the middle part of it, like this, being formed at the radial air gap between described permanent magnet poles 16 and described teeth portion 242 along the circumference of described rotor 10 is non-uniform Distribution.
Please refer to Fig. 5 and Fig. 6, preferably, each described permanent magnet poles 162 have towards the inner surface 166 of described rotor core 14 and in described inner surface 166 relatively and towards the outer surface 168 of described stator core 24, the inner surface 166 of each described permanent magnet poles 16 is arc surface, its outer surface 168 is arc surface
Please refer to Fig. 5, further, each described permanent magnet poles 16 is formed by permanent magnet, and along described rotor 10 circumference adjacent two described in be formed with gap 160 between permanent magnet poles 16.Form a gap 160 between permanent magnet poles 16 described in adjacent two, this gap 160 extends along the axis of described rotor 10, and each gap 160 is parallel to described rotating shaft 12.By arranging described gap 160 in case leak-stopping magnetic, and embedding can fix described permanent magnet poles 16 and prevent described permanent magnet poles 16 from coming off.
Brushless electric machine in the various embodiments described above is the brshless DC motor of position-sensor-free, the type motor has good controllability, wide speed regulating range, does not have brush and the commutator's spark, wear problem, there is higher reliability, long working life, without the need to frequent maintenance, because there is no position transducer, this brushless electric machine can work in the presence of a harsh environment, and connecting line is few, and electromagnetic interference is little.
The brushless electric machine that each embodiment of the utility model provides is particularly useful for needing cogging torque little, as the control motor of air throttle of car.
The foregoing is only preferred embodiment of the present utility model; not in order to limit the utility model; all do within spirit of the present utility model and principle any amendment, equivalent to replace and improvement etc., all should be included within protection range of the present utility model.
Claims (7)
1. a brushless electric machine, comprise rotor and be arranged at the stator outside described rotor, it is characterized in that: described stator comprises shell, the stator core be arranged in described shell, be set around the iron core winding on described stator core and be installed on the end cap of openend of described shell; Described rotor comprises the rotating shaft be rotationally connected with on described stator, be fixedly installed in the rotor core in described rotating shaft and be fixedly installed on described rotor core excircle and around the permanent magnet poles inside described stator core; Described stator core comprises the yoke portion of annular and inwardly stretches out from described yoke portion and be arranged with the teeth portion of described iron core winding, and described teeth portion and described yoke portion splice.
2. brushless electric machine as claimed in claim 1, is characterized in that: described teeth portion comprises the middle part of iron core winding described in winding and is positioned at the end of both sides, described middle part, and described end is less than the thickness at described middle part in the thickness of described stator radial direction.
3. brushless electric machine as claimed in claim 2, is characterized in that: the center of circle in described end, described middle part and described yoke portion is that decentraction is arranged.
4. brushless electric machine as claimed in claim 1, is characterized in that: described in each, iron core winding correspondence is set around a described teeth portion, and adopts Y-connection mode to be set around described teeth portion.
5. the brushless electric machine as described in Claims 1-4 any one, is characterized in that: form radial air gap between each described permanent magnet poles and described stator core, and described radial air gap is uneven setting along the thickness of the circumferencial direction of described rotor.
6. brushless electric machine as claimed in claim 5, it is characterized in that: each described permanent magnet poles have towards the inner surface of described rotor core and in described inner surface relatively and towards the outer surface of described stator core, the inner surface of each described permanent magnet poles is arc surface, and its outer surface is arc surface.
7. the brushless electric machine as described in Claims 1-4 any one, is characterized in that: each described permanent magnet poles is formed by permanent magnet, and along described rotor circumference adjacent two described in be formed with gap between permanent magnet poles.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420492211.7U CN204156618U (en) | 2014-08-28 | 2014-08-28 | Brushless electric machine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420492211.7U CN204156618U (en) | 2014-08-28 | 2014-08-28 | Brushless electric machine |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204156618U true CN204156618U (en) | 2015-02-11 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420492211.7U Active CN204156618U (en) | 2014-08-28 | 2014-08-28 | Brushless electric machine |
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| CN (1) | CN204156618U (en) |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105610293A (en) * | 2016-01-26 | 2016-05-25 | 浙江科宁电机有限公司 | Eccentric air gap direct current brush motor structure |
| CN106160388B (en) * | 2015-03-30 | 2018-11-30 | 北京自动化控制设备研究所 | A kind of Low gullet torque brshless DC motor optimization method |
| CN109245345A (en) * | 2018-09-21 | 2019-01-18 | 中创机电科技(深圳)有限公司 | A kind of brushless motor stator structure |
| CN109412285A (en) * | 2018-11-26 | 2019-03-01 | 成都富临精工电子电器科技有限公司 | A kind of non-brush permanent-magnet DC motor stator structure |
| CN113346706A (en) * | 2020-02-18 | 2021-09-03 | 莱克电气股份有限公司 | Magnetic circuit optimization motor and hair care appliance using same |
| US11245293B2 (en) | 2019-08-14 | 2022-02-08 | Industrial Technology Research Institute | Motor stator with dovetail or rectangular mount structure and stator teeth airgap width ratio |
| CN114598116A (en) * | 2022-03-18 | 2022-06-07 | 北京航空航天大学宁波创新研究院 | Stator core assembling tool and using method thereof |
-
2014
- 2014-08-28 CN CN201420492211.7U patent/CN204156618U/en active Active
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106160388B (en) * | 2015-03-30 | 2018-11-30 | 北京自动化控制设备研究所 | A kind of Low gullet torque brshless DC motor optimization method |
| CN105610293A (en) * | 2016-01-26 | 2016-05-25 | 浙江科宁电机有限公司 | Eccentric air gap direct current brush motor structure |
| CN109245345A (en) * | 2018-09-21 | 2019-01-18 | 中创机电科技(深圳)有限公司 | A kind of brushless motor stator structure |
| CN109412285A (en) * | 2018-11-26 | 2019-03-01 | 成都富临精工电子电器科技有限公司 | A kind of non-brush permanent-magnet DC motor stator structure |
| US11245293B2 (en) | 2019-08-14 | 2022-02-08 | Industrial Technology Research Institute | Motor stator with dovetail or rectangular mount structure and stator teeth airgap width ratio |
| CN113346706A (en) * | 2020-02-18 | 2021-09-03 | 莱克电气股份有限公司 | Magnetic circuit optimization motor and hair care appliance using same |
| CN113346706B (en) * | 2020-02-18 | 2023-06-13 | 莱克电气股份有限公司 | Magnetic circuit optimization motor and hair care appliance using same |
| CN114598116A (en) * | 2022-03-18 | 2022-06-07 | 北京航空航天大学宁波创新研究院 | Stator core assembling tool and using method thereof |
| CN114598116B (en) * | 2022-03-18 | 2023-09-15 | 北京航空航天大学宁波创新研究院 | Stator core assembly fixture and application method thereof |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant |