CN104104168A - Stator and rotor structure of built-in permanent magnet brushless direct current motor - Google Patents
Stator and rotor structure of built-in permanent magnet brushless direct current motor Download PDFInfo
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- CN104104168A CN104104168A CN201410340311.2A CN201410340311A CN104104168A CN 104104168 A CN104104168 A CN 104104168A CN 201410340311 A CN201410340311 A CN 201410340311A CN 104104168 A CN104104168 A CN 104104168A
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Abstract
The invention discloses a stator and rotor structure of a built-in permanent magnet brushless direct current motor, and belongs to the technical field of motors. The stator and rotor structure of the built-in permanent magnet brushless direct current motor is characterized in that more than one V-shaped groove (2) is formed in the circumference of a rotor, opening ends of each two adjacent V-shaped grooves are communicated through a communication arch groove (4), two symmetrical gap grooves (5) are located in the direction towards the interior of the opening end of each V-shaped groove, permanent magnets (6) of the same polarity are placed in the left portion and the right portion of each V-shaped groove (2), the polarities of the permanent magnets in each two adjacent V-shaped grooves are opposite, an inclined bevel (7) is arranged at the bottom of each communication arch groove (4), and the external circle of a stator (8) is processed by using an enneagon irregularity edge cutting method, and is of three phase fraction slot centralization winding structure. The stator and rotor structure of the built-in permanent magnet brushless direct current motor not only can improve efficiency of the built-in V-shaped permanent magnet brushless direct current motor, but also can reduce output torque fluctuation, and has the advantages of reducing magnetic leakage flux during the same period, and being low in noise and high in efficiency.
Description
Technical field
The present invention relates to a kind of efficient built-in permanent-magnet brushless direct current machine stator and rotor sructure, belong to technical field of motors.
Background technology
Energy shortage is the common problem of paying close attention in the whole world, and energy-conservation is the theme of world today's development; Commercial motor consumes the 30%-40% of energy production world amount at present, and the efficiency that therefore improves commercial motor can realize obvious energy-saving effect.Permanent-magnet brushless DC electric machine is owing to adopting permanent magnet excitation, and when stable operation, there is no rotor resistance loss, and then can reduce fan (small-capacity motor even can remove fan) and corresponding wind abrasion because total losses reduce, thereby there is very large efficiency, improve space and advantage.For the characteristic of permanent-magnet brushless DC electric machine, by stator and rotor sructure optimal design, can improve the efficiency of permanent-magnet brushless DC electric machine.
The operation principle of built-in " V " font permanent-magnet brushless direct current machine is, the rotating magnetic field that the electric excitation of stator produces, and the magnetic field interaction producing with permanent magnet built-in in rotor rotates rotor; Because permanent magnet is embedded into rotor, rotor surface is relatively smooth, has saliency, but causes magnetic leakage factor larger, and air-gap flux is relatively little, and permanent magnet utilance is lower.Conventionally on rotor, arrange every modes such as magnetic bridge, auxiliary tanks, reduce leakage field; But irrational setting every magnetic bridge and auxiliary tank, not only causes the decline of motor proper property, also may bring larger torque ripple and noise; Therefore, reasonably arrange permanent magnet position, every magnetic bridge and auxiliary tank, to improving electric efficiency and motor dynamics performance, there is positive meaning.
Summary of the invention
Goal of the invention: in order to overcome the deficiencies in the prior art, the invention provides a kind of stator rotor structure of built-in permanent-magnet brushless direct current machine, it not only can improve the efficiency of built-in " V " font permanent-magnet brushless DC electric machine, and can reduce output torque ripple.
For achieving the above object, the technical solution used in the present invention is: a kind of stator rotor structure of built-in permanent-magnet brushless direct current machine, comprise stator and rotor, described rotor is built in stator, on described rotor, edge is circumferentially provided with above " V " font groove (2), and the opening of described " V " font groove points to stator; Between the openend of two adjacent " V " font grooves, by being communicated with arcuate recess (4), be communicated with, and be provided with two symmetrical clearance channels (5) in the inside direction of the openend of each " V " font groove; In left and right two grooves of each " V " font groove (2), be placed with the permanent magnet that polarity is identical (6), and the vertical permanent magnetism dignity of the direction of magnetization of this permanent magnet (6), and the polarity of the permanent magnet of adjacent " V " font groove is contrary; Described connection arcuate recess (4) bottom is provided with the mobile inclined ramp (7) of restriction permanent magnet (6); The cylindrical of described stator (8) adopts the irregular trimming of nonagon to process, and adopts the centralized winding construction of three-phase fractional-slot.
Further: the other end bottom that described " V " font groove is relative with opening is provided with reinforcement (3).
Preferred: described connection arcuate recess (4) is arch bridge structure, comprise arch bridge outer arc and arch bridge inner arc, described arch bridge outer arc is parallel with rotor circular arc, and described arch bridge inner arc is connected with inclined ramp (7); Described inclined ramp (7) is to permanent magnet (6) lopsidedness, and described inclined ramp (7) becomes α angle with permanent magnet (6) end.
Preferred: the outside of described clearance channel (5), inner side camber line are all parallel with rotor circular arc.
Preferred: the irregular trimming of described nonagon is processed and referred to the figure that is cut into arc depression form on stator yoke portion cylindrical corresponding to stator tooth.
Preferred: described rotor (1) is overrided to form by stamping forming circular thin silicon steel plates; Described stator (8) is overrided to form by stamping forming circular thin silicon steel plates; Described permanent magnet (6) is made by permanent magnetic steel, and the direction of magnetization of this permanent magnetic steel is perpendicular to permanent magnetic steel face.
Preferred: the number of described " V " font groove (2) is 6; The width of reinforcement (3) of described " V " font groove (2) bottom and the width of permanent magnet (6) are than being 1:0.9-1.23.
Preferred: the vertical range of described arch bridge outer arc and rotor circular arc is 0.5mm; Vertical range between described arch bridge inner arc top and arch bridge outer arc is 0.7-1.3mm; Described α angle is 0-60 °.
Preferred: described clearance channel (5) lateral arcs and rotor outer circle arc vertical range are 0.5mm; Groove width is 0.25mm, and groove arc length is 2.67mm.
The stator rotor structure of a kind of built-in permanent-magnet brushless direct current machine provided by the invention, compared to existing technology, has following beneficial effect:
1. because end, " V " font left and right sides is provided with the connectivity slot that is communicated with adjacent " V " font, should have to the inside two relative clearance channels in " V " font end simultaneously, this clearance channel is used for adjusting magnetic flux path, therefore by optimizing the length of this clearance channel and width and the length of width and " V " font bottom reinforcement, reduce leakage field, improve electric efficiency.
2. stator adopts the centralized winding of three-phase fractional-slot, has reduced winding copper consumption, reduces copper loss and has reduced cogging torque, reduces vibration and noise.
3. because the width of reinforcement is less, the magnetic resistance at this position is just larger, and therefore " V " font trench bottom is provided with reinforcement, more can play restriction leakage flux, but the too small meeting of reinforcement causes silicon steel sheet mechanical strength variation, its width is 1:0.9-1.23 with the width ratio of permanent magnet.
4. owing to being provided with inclined ramp, therefore can limit the movement of permanent magnetic steel.
5. because clearance channel arc length length is 2.67mm, width is 0.25mm, and now leakage field reduces successful, and rotor mechanical intensity is large.
In sum, the present invention not only can improve the efficiency of built-in " V " font permanent-magnet brushless DC electric machine, and can reduce output torque ripple, the advantage that same time leakage field reduces, noise is low, efficiency is high.
Accompanying drawing explanation
Fig. 1 is 6 utmost point rotor structure figures of efficiently built-in " V " shape permanent-magnet brushless direct current machine.
Fig. 2 is the arch bridge flute profile figure of connection adjacent " V " font of end, " V " font left and right sides.
Fig. 3 is the irregular trimming figure of the nonagon of stator.
Fig. 4 is permanent magnetic steel direction of magnetization schematic diagram, and in figure, the direction of arrow is the direction of magnetization.
Fig. 5, the structural representation of the embodiment of the present invention.
Wherein: 1 is silicon steel sheet, 2 is " V " font groove, and 3 is reinforcement, and 4 for being communicated with arcuate recess, and 5 is clearance channel, and 6 is permanent magnetic steel, and 7 is inclined ramp, and 8 is stator, and 9 is arc depression excision form, and α is the angle of permanent magnet and inclined ramp.
Embodiment
Below in conjunction with accompanying drawing, the present invention is further described.
A kind of stator rotor structure of built-in permanent-magnet brushless direct current machine, as shown in Figure 5: comprise stator and rotor, described rotor is built in stator, and on described rotor, edge is circumferentially provided with above " V " font groove (2), and the opening of described " V " font groove points to stator; The other end bottom that described " V " font groove is relative with opening is provided with reinforcement (3).Between the openend of two adjacent " V " font grooves, by being communicated with arcuate recess (4), be communicated with, and be provided with two symmetrical clearance channels (5) in the inside direction of the openend of each " V " font groove; In left and right two grooves of each " V " font groove (2), be placed with the permanent magnet that polarity is identical (6), and the vertical permanent magnetism dignity of the direction of magnetization of this permanent magnet (6), and the polarity of the permanent magnet of adjacent " V " font groove is contrary; Described connection arcuate recess (4) bottom is provided with the mobile inclined ramp (7) of restriction permanent magnet (6); The cylindrical of described stator (8) adopts the irregular trimming of nonagon to process, and adopts the centralized winding construction of three-phase fractional-slot.
Described connection arcuate recess (4) is arch bridge structure, comprises arch bridge outer arc and arch bridge inner arc, and described arch bridge outer arc is parallel with rotor circular arc, and described arch bridge inner arc is connected with inclined ramp (7); Described inclined ramp (7) is to permanent magnet (6) lopsidedness, and described inclined ramp (7) becomes α angle with permanent magnet (6) end.
The outside of described clearance channel (5), inner side camber line are all parallel with rotor circular arc.
The irregular trimming of described nonagon is processed and is referred to the figure that is cut into arc depression form on stator yoke portion cylindrical corresponding to stator tooth.
Described rotor (1) is overrided to form by stamping forming circular thin silicon steel plates; Described stator (8) is overrided to form by stamping forming circular thin silicon steel plates; Described permanent magnet (6) is made by permanent magnetic steel, and the direction of magnetization of this permanent magnetic steel is perpendicular to permanent magnetic steel face.
The number of described " V " font groove (2) is 6; The width of reinforcement (3) of described " V " font groove (2) bottom and the width of permanent magnet (6) are than being 1:0.9-1.23.
The vertical range of described arch bridge outer arc and rotor circular arc is 0.5mm; Vertical range between described arch bridge inner arc top and arch bridge outer arc is 0.7-1.3mm; Described α angle is 0-60 °.
Described clearance channel (5) lateral arcs and rotor outer circle arc vertical range are 0.5mm; Groove width is 0.25mm, and groove arc length is 2.67mm.
Principle of the present invention is as follows:
Utilize the principle of " magnetic circuit reaches capacity to limit the leakage flux that is embedded in the permanent magnet in motor ", on rotor, be provided with some " V " font for embedding the groove of permanent magnet, these grooves are arranged on take on each limit of the approximate regular polygon that rotating shaft core is round dot, in two grooves of " V " font left and right, be placed with the permanent magnetic steel that magnetic pole is identical, the vertical magnet steel face of the direction of magnetization of this magnet steel; " V " font bottom arranges reinforcement, end, " V " font left and right sides is provided with the connectivity slot that is communicated with adjacent " V " font, should have to the inside two relative clearance channels in " V " font end simultaneously, this clearance channel is used for adjusting magnetic flux path, by optimizing the length of this clearance channel and width and the length of width and " V " font bottom reinforcement, reduce leakage field, improve electric efficiency.Stator cylindrical adopts the irregular trimming of nonagon to process, and stator yoke portion cylindrical is cut into the concavo-convex form figure of circular arc.Adopt the centralized winding of three-phase fractional-slot, reduced winding copper consumption, reduce copper loss and reduced cogging torque, reduce vibration and noise.
As shown in Figure 1; Built-in V-arrangement permanent-magnet brushless direct current (DC) motor rotor structure, is provided with into " V " font groove of hexagonal structure on this rotor, this groove is used for placing permanent magnetic steel; Should be provided with reinforcement by " V " font trench bottom, the width of reinforcement is less, and the magnetic resistance at this position is just larger, more can play restriction leakage flux, but the too small meeting of reinforcement causes silicon steel sheet mechanical strength variation, its width is 1:0.9-1.23 with the width ratio of permanent magnet.
As shown in Figure 2; The connectivity slot should " V " font groove two ends being connected with adjacent " V " font groove end respectively, this connectivity slot is arch bridge structure, the connectivity slot outer arc of this arch bridge structure and rotor outer circle vertical range are 0.5mm; (7) in Fig. 2, for sloping inwardly the inclined-plane of 0-60 °, are used for limiting the movement of permanent magnetic steel.
As shown in Figure 4, in these " V " font groove two side channels, be embedded with respectively the rectangle permanent magnetic steel that polarity is identical, and be embedded with opposite polarity rectangle permanent magnetic steel in adjacent " V " font groove two side channels.
" V " font groove end is provided with to the clearance channel of the interior direction of " V " word, and clearance channel outside is all parallel with rotor outer circle with inside arc, and clearance channel lateral arcs and rotor outer circle arc vertical range are 0.5mm; Clearance channel arc length length is 2.67mm, and width is 0.25mm, and the difference of this arc length length value is also different on motor flux leakage impact, and arc length length is too small, and leakage field reduces DeGrain; Arc length length is long, and leakage field reduces phenomenon and no longer includes significant change, and rotor mechanical intensity reduces greatly.
As shown in Figure 3, on stator cylindrical, adopt the irregular trimming mode of nonagon, on stator yoke portion cylindrical corresponding to stator tooth, be cut into arc depression form (9) figure.
The centralized winding of described three-phase fractional-slot, number of stator slots is Z, rotor magnetic pole logarithm is P, every extremely every phase groove is counted q=Z/2mp, the q of selectable Z/p combination within the scope of 1/4-1/2, coil span y=1, the present embodiment adopts 9 groove 6 polar forms, and q is 1/2, and coil span is 1.
The above is only the preferred embodiment of the present invention; be noted that for those skilled in the art; under the premise without departing from the principles of the invention, can also make some improvements and modifications, these improvements and modifications also should be considered as protection scope of the present invention.
Claims (9)
1. the stator rotor structure of a built-in permanent-magnet brushless direct current machine, comprise stator and rotor, described rotor is built in stator, it is characterized in that: on described rotor, edge is circumferentially provided with above " V " font groove (2), and the opening of described " V " font groove points to stator; Between the openend of two adjacent " V " font grooves, by being communicated with arcuate recess (4), be communicated with, and be provided with two symmetrical clearance channels (5) in the inside direction of the openend of each " V " font groove; In left and right two grooves of each " V " font groove (2), be placed with the permanent magnet that polarity is identical (6), and the vertical permanent magnetism dignity of the direction of magnetization of this permanent magnet (6), and the polarity of the permanent magnet of adjacent " V " font groove is contrary; Described connection arcuate recess (4) bottom is provided with the mobile inclined ramp (7) of restriction permanent magnet (6); The cylindrical of described stator (8) adopts the irregular trimming of nonagon to process, and adopts the centralized winding construction of three-phase fractional-slot.
2. the stator rotor structure of built-in permanent-magnet brushless direct current machine according to claim 1, is characterized in that: the other end bottom that described " V " font groove is relative with opening is provided with reinforcement (3).
3. the stator rotor structure of built-in permanent-magnet brushless direct current machine according to claim 2, it is characterized in that: described connection arcuate recess (4) is arch bridge structure, comprise arch bridge outer arc and arch bridge inner arc, described arch bridge outer arc is parallel with rotor circular arc, and described arch bridge inner arc is connected with inclined ramp (7); Described inclined ramp (7) is to permanent magnet (6) lopsidedness, and described inclined ramp (7) becomes α angle with permanent magnet (6) end.
4. the stator rotor structure of built-in permanent-magnet brushless direct current machine according to claim 3, is characterized in that: the outside of described clearance channel (5), inner side camber line are all parallel with rotor circular arc.
5. the stator rotor structure of built-in permanent-magnet brushless direct current machine according to claim 4, is characterized in that: the irregular trimming of described nonagon is processed and referred to the figure that is cut into arc depression form on stator yoke portion cylindrical corresponding to stator tooth.
6. the stator rotor structure of built-in permanent-magnet brushless direct current machine according to claim 5, is characterized in that: described rotor (1) is overrided to form by stamping forming circular thin silicon steel plates; Described stator (8) is overrided to form by stamping forming circular thin silicon steel plates; Described permanent magnet (6) is made by permanent magnetic steel, and the direction of magnetization of this permanent magnetic steel is perpendicular to permanent magnetic steel face.
7. the stator rotor structure of built-in permanent-magnet brushless direct current machine according to claim 6, is characterized in that: the number of " V " font groove (2) is 6; The width of reinforcement (3) of described " V " font groove (2) bottom and the width of permanent magnet (6) are than being 1:0.9-1.23.
8. the stator rotor structure of built-in permanent-magnet brushless direct current machine according to claim 7, is characterized in that: the vertical range of described arch bridge outer arc and rotor circular arc is 0.5mm; Vertical range between described arch bridge inner arc top and arch bridge outer arc is 0.7-1.3mm; Described α angle is 0-60 °.
9. the stator rotor structure of built-in permanent-magnet brushless direct current machine according to claim 8, is characterized in that: described clearance channel (5) lateral arcs and rotor outer circle arc vertical range are 0.5mm; Groove width is 0.25mm, and groove arc length is 2.67mm.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410340311.2A CN104104168B (en) | 2014-07-16 | 2014-07-16 | A kind of stator rotor structure of built-in permanent-magnet brushless direct current generator |
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| CN201410340311.2A CN104104168B (en) | 2014-07-16 | 2014-07-16 | A kind of stator rotor structure of built-in permanent-magnet brushless direct current generator |
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| CN104104168B CN104104168B (en) | 2016-08-24 |
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Cited By (8)
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| CN104882978A (en) * | 2015-05-07 | 2015-09-02 | 东南大学 | Low-torque-ripple high-efficient permanent magnetic motor stator and rotor structure |
| CN105024470A (en) * | 2015-07-13 | 2015-11-04 | 东菱技术有限公司 | Magnetic steel offset structure |
| CN105846627A (en) * | 2016-03-24 | 2016-08-10 | 东南大学 | Rotor structure for improving permanent magnet motor power and torque density |
| CN108808910A (en) * | 2018-06-04 | 2018-11-13 | 江苏大学 | A kind of built-in hybrid permanent magnet motor |
| CN109067037A (en) * | 2018-08-17 | 2018-12-21 | 江苏大学 | A kind of hybrid permanent magnet motor rotor construction of high torque density |
| WO2019161624A1 (en) * | 2018-02-26 | 2019-08-29 | 东南大学 | Asymmetric dual three-phase arc permanent magnet synchronous motor |
| CN108233570B (en) * | 2016-12-15 | 2020-09-18 | 富士电机株式会社 | Rotor and permanent magnet type rotating electric machine |
| USD960086S1 (en) | 2017-07-25 | 2022-08-09 | Milwaukee Electric Tool Corporation | Battery pack |
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Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104882978A (en) * | 2015-05-07 | 2015-09-02 | 东南大学 | Low-torque-ripple high-efficient permanent magnetic motor stator and rotor structure |
| CN104882978B (en) * | 2015-05-07 | 2018-03-20 | 东南大学 | A kind of low torque ripple high efficiency permanent magnet motor stator and rotor structure |
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| CN108233570B (en) * | 2016-12-15 | 2020-09-18 | 富士电机株式会社 | Rotor and permanent magnet type rotating electric machine |
| USD960086S1 (en) | 2017-07-25 | 2022-08-09 | Milwaukee Electric Tool Corporation | Battery pack |
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| WO2019161624A1 (en) * | 2018-02-26 | 2019-08-29 | 东南大学 | Asymmetric dual three-phase arc permanent magnet synchronous motor |
| CN108808910A (en) * | 2018-06-04 | 2018-11-13 | 江苏大学 | A kind of built-in hybrid permanent magnet motor |
| CN109067037A (en) * | 2018-08-17 | 2018-12-21 | 江苏大学 | A kind of hybrid permanent magnet motor rotor construction of high torque density |
| CN109067037B (en) * | 2018-08-17 | 2020-06-26 | 江苏大学 | High-torque-density hybrid permanent magnet motor rotor structure |
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