CN208241417U - A kind of high power density permanent magnet motor - Google Patents

Abstract

The utility model relates to magneto fields, disclose a kind of high power density permanent magnet motor, including casing, stator core, asymmetric mixed rotor iron core, permanent magnet, axis, winding and Insulating frame；The gap that the contact site of the stator core and the casing is formed between ground protection system, with the casing forms region filling；The asymmetric mixed rotor iron core includes shaft lantern ring, axis hole, sector, connecting bridge and support protrusion, and the adjacent sector has different planar structures.The utility model can simplify the production technology of motor, and the structural strength of motor can be improved.

Description

A kind of high power density permanent magnet motor

Technical field

The utility model relates to magneto fields, more particularly to a kind of high power density permanent magnet motor.

Background technique

Conventional brushless DC motor uses surface-mount type magnetic shoe or built-in radial magnetizing ring alnico structure, and power density is lower, It is limited to cost factor, the every pole magnetic flux of motor is improved by cutting orientation magnetizing parallel circuits structure.Existing cutting orientation magnetizing structure there are still The big problem of leakage field limits motor performance promotion.

Patent CN201611226568.0 designs a kind of rotor core, which has at least one teeth portion sector and rotor set The disconnection of ring, while thering is at least one teeth portion sector to be connected with shaft lantern ring.Inhibit the leakage field at paraxial place with this.The rotor core Shaft lantern ring is externally provided with positioning convex portion, the positioning and support to permanent magnet.By analysis, the tooth disconnected due to program rotor Portion sector is axial, and without fixed support part, axial arrangement intensity is poor, is unfavorable for being mass produced, meanwhile, it is above-mentioned to prop up The positioning protrusion of support and positioning permanent magnet will be produced from interlinked leakage, reduce power of motor density, be unfavorable for improving performance.

On the other hand, for the motor of built-in cutting orientation magnetizing due to the promotion of power density, stator core is easily saturated generation Higher core loss reduces electric efficiency.Electromagnetic force wave enhancing simultaneously causes vibration noise to increase.The prior art passes through tiltedly extremely oblique The methods of slot inhibits vibration noise, and corresponding method increases manufacturing process difficulty and simultaneously increase production hour, patent CN201320738896.4 devises the stator core of the curved circle of bar shaped, and the program inwardly stretches out teeth portion, phase from stator ring yoke portion Line embedding groove is formed between two adjacent stator teeths.Stator magnetic circuit balance, flux density is moderate average, reduces part saturation, technique Simply, production efficiency is higher.But above-mentioned patent only relies on the parameters such as stator rabbet width, teeth portion width and yoke portion width to flux density It is averaging processing, fails to consider the influence of stator profile and structure to motor-field, loss etc., not applicable and high power density Electric machine structure does not provide energy also to consider to reduce motor oscillating noise by the combined method between stator core and casing The structure of enough considering power density and vibration suppression noise reduction.

Therefore, a kind of simple process that can be suitably used for mass production is needed, the reliable high power density of structure, and The permanent-magnet brushless DC electric machine of low-vibration noise.

Utility model content

In order to overcome the shortcomings of the prior art, the technical problem to be solved by the present invention is to provide a kind of high powers Density permanent magnet motor, which not only can simplify production technology, but also structural strength and power can be improved Density.

In order to solve the above-mentioned technical problem of the utility model, the utility model provides a kind of high-power density permanent magnetic electricity Machine, including casing, stator core, asymmetric mixed rotor iron core, permanent magnet, axis, winding and Insulating frame；

The gap that the contact site of the stator core and the casing is formed between ground protection system, with the casing, which is formed, to be filled out Fill domain；

The asymmetric mixed rotor iron core includes shaft lantern ring, axis hole, sector, connecting bridge and support protrusion, adjacent The sector have different planar structures.

Preferably, the stator core connects yoke by T-type tooth and encloses, and the T-type tooth connects outer surface and the stator slot of yoke Bottom is parallel, and the teeth portion that T-type tooth connects yoke is vertical with the boundary face in yoke portion, and the quantity that T-type tooth connects yoke is equal with number of slots.

Preferably, each T-type tooth connects yoke equipped with inside and outside two rivet points of different sizes, and the size of outer rivet point is big In the size of interior rivet point.

Preferably, the outer boundary of the stator core is in regular polygon structure；

The stator core and the casing connect the connection point contact of yoke in each T-type tooth, and stator core and casing are not The gap of contact constitutes region filling by injection packing material.

Preferably, in an at least laminate, shaft lantern ring punching is radially raised, formation connecting bridge, and adjacent two A connecting bridge has different width and length, and connecting bridge extends radially outward to form sector.

Preferably, the shaft lantern ring punching of the laminate all connects and composes full crossover formula lamination.

Preferably, in same laminate, sector is asymmetric, and two adjacent sectors and connecting bridge connecting place size are not Together.

Preferably, permanent magnet is placed in the slot among the sector, the polarity phase of the permanent magnet in two neighboring slot Different, the corresponding shaft lantern ring punching is radially raised in slot, forms support bridge.

Preferably, at least one described laminate, the shaft lantern ring punching extends radially outward to form protrusion, The protrusion of adjacent two has different width and length.

Preferably, the small protrusion of width is connect with the sector, and the big protrusion of width does not connect with the sector It connects.

Preferably, the laminate sector is connect with the shaft collar portion, forms half crossover formula lamination.

Preferably, two adjacent sector areas differ.

Preferably, permanent magnet is placed in the slot among the sector, the polarity phase of the permanent magnet in two neighboring slot Different, corresponding shaft lantern ring punching extends radially outward to form slot bottom protrusion in slot.

Preferably, the support bridge is contacted with the permanent magnet.

Preferably, the slot bottom protrusion is not contacted with the permanent magnet.

Preferably, the external arc surface of the shaft lantern ring punching includes the x sections of battens for reducing torque ripple, described Batten is arc section or straightway；

The x sections of batten includes at least one section of main batten in centre and sets up two sections of straightways of two sides separately.

The utility model can simplify the production technology of motor, and the structural strength of motor can be improved.By design every Disconnected formula support bridge and the wide magnetic bridge of partition-type, motor rotor construction intensity are substantially improved.Meanwhile half crossover formula lamination guarantee rotor iron The sector of one lamination of core at least half can be connected with axle sleeve, be easy to position in large-scale production process.

Rotor slot bottom can be greatly reduced from interlinked leakage by the utility model, to improve air-gap flux, pass through T-type tooth Even yoke stator structure, can reduce motor degree of saturation, maximize every pole magnetic flux.Compare the utility model electric machine structure and biography The back emf coefficient of the electric machine structure of system full-bridge connection can be seen that be obviously improved using the winding back emf coefficient of the structure, In motor heavy service, torque-current curve linearity of motor is good, does not occur saturated phenomenon, to improve motor Energy.

By five sections of batten formula structures of rotor, the back-emf percent harmonic distortion of motor is lower, the sine degree of air-gap field compared with It is good, the tangential torque pulsation of motor and radial vibration are reduced with this.Meanwhile yoke structure is connected using T-type tooth, contain between stator and casing There is region filling, weaken the transmitting vibrated between stator itself and casing with this, realizes the vibration and noise reducing of motor.

Rotor slot bottom is reduced from interlinked leakage to improve power density, it is ensured that the high sine of air-gap field, substantially Improve back emf coefficient.The utility model can simplify the production technology of motor, and the structural strength of motor can be improved.From electricity As can be seen that reducing rotor slot bottom from interlinked leakage to improve power density in machine structure, it is ensured that the height of air-gap field is just String greatly improves back emf coefficient.

Detailed description of the invention

Fig. 1 is the structural schematic diagram of the utility model one embodiment；

Fig. 2 is the structural schematic diagram of rotor pack in the utility model one embodiment；

Fig. 3 is the structural schematic diagram that T-type tooth connects yoke in the utility model one embodiment；

Fig. 4 is field frame assembly structural schematic diagram in the utility model one embodiment；

Fig. 5 is the structural schematic diagram of rotor punching B in the utility model one embodiment；

Fig. 6 is the structural schematic diagram of rotor punching A in the utility model one embodiment；

Fig. 7 (a) is that full-bridge linking rotor slot bottom is (b) that box is irised out in (a) from the Leakage flux distribution that interlinks in the prior art Partial partial enlarged view；

Fig. 8 (a) is in the prior art without partition support bridge type rotor slot bottom from the Leakage flux distribution that interlinks, and is (b) side in (a) Frame irises out the partial enlarged view of part；

Fig. 9 (a) is the utility model partition support bridge type rotor slot bottom from the Leakage flux distribution that interlinks, and is (b) box in (a) Iris out the partial enlarged view of part；

Figure 10 be three kinds of different structure motors paraxial place's slot bottom from interlinkage magnetic leakage factor correlation curve；

Figure 11 is that regular polygon T-type tooth connects space schematic diagram in yoke stator slot in the utility model one embodiment；

Figure 12 is space schematic diagram in traditional structure stator slot；

Figure 13 is each section of batten distribution schematic diagram of five sections of batten rotor punchings in the utility model one embodiment；

Figure 14 is the unloaded back-emf harmonic content of the utility model one embodiment；

Figure 15 is the decomposition texture schematic diagram of rotor pack in the utility model one embodiment；

Figure 16 is the structural schematic diagram of half crossover formula lamination in the utility model one embodiment.

Description of symbols

Casing 1；

Stator core 2；Ground protection system 22；Region filling 23；

T-type tooth connects yoke 21；Yoke portion 211；Stator slot bottom 2111；Inflection point 2112；Teeth portion 212；Inclined shoulder type crown slot 2121； Outer rivet point 213；Interior rivet point 214；

Rotor core 3；

Full crossover formula lamination 31；Full crossover punching 311；External arc surface 3111；Plastic through-hole 3112；Rivet point 3113； Support bridge 312；Wide magnetic bridge 313；Narrow magnetic bridge 314；

Half crossover formula lamination 32；Half crossover punching 321；The external arc surface 3211 of half crossover punching；Half crossover punching Plastic through-hole 3212；The rivet point 3213 of half crossover punching；Separate punching 322；Separate the external arc surface 3221 of punching；Separation The plastic through-hole 3222 of punching；Separate the rivet point 3223 of punching；Partition-type support bridge 323；The wide magnetic bridge 324 of partition-type；Narrow magnetic Bridge 325；

Permanent magnet 4；Axis 5；Winding 6；7 Insulating frames.

Specific embodiment

Specific embodiment of the present utility model is described in detail below in conjunction with attached drawing.It should be understood that herein Described specific embodiment is only used for describing and explaining the present invention, and is not intended to limit the utility model.

As shown in Figure 1, one embodiment of the utility model is permanent-magnet brushless DC electric machine, including casing 1, just polygon Shape stator core 2, asymmetric mixing closed assembly rotor core 3, permanent magnet 4, axis 5, winding 6 and Insulating frame 7.

As shown in Figures 3 and 4, stator core 2 connects yoke 21 by 12 T-type teeth and encloses, between stator core 2 and casing 1 Connect the connection point contact between yoke 21 by adjacent T-type tooth, contact site forms ground protection system 22, and each T-type tooth connects the yoke portion of yoke 21 The gap of 211 outer surface or top surface between plane, and the inner wall of circular casing 1 forms region filling 23, region filling 23 Interior fillable multiple material, in this example, casing 1 is tubular molding compound, then tubular molding compound is also injected into region filling 23, i.e., Casing 1 and packing material are same material, and the two mixing plays enhancing motor rigidity, improves damping, absorb the effect of vibration. Winding 6 uses flying trident coiling, and designed stator groove profile can effectively avoid flying trident coiling interference, improve and produce efficiency in enormous quantities.

As shown in figure 3, the outer surface that T-type tooth connects the yoke portion 211 of yoke 21 is parallel with stator slot bottom 2111, T-type tooth connects yoke 21 Inside and outside two rivet points of different sizes are equipped with, the size of outer rivet point 213 is greater than the size of interior rivet point 214, this implementation In example, outer 213 diameter of rivet point is 1.2mm, 214 diameter of interior rivet point is 1.0mm；Outer rivet point 213 is set to 211 center of yoke portion Position, interior rivet point 214 are set in the middle part of the crown of teeth portion 212；The crown shape of teeth portion 212 is inclined shoulder type, inclined shoulder type crown slot 2121 outer inclined-plane and the angle of 212 radial boundary of teeth portion are obtuse angle, preferably 120 °, the appearance of teeth portion 212 and yoke portion 211 Face or stator slot bottom 2111 are vertical, and the straight line slope over 10 of inclined shoulder type crown slot 2121 is 30 °, and 212 narrowest place width of teeth portion is 5.2mm, 211 height of yoke portion are 3.5mm, are calculated in conjunction with production technology, in the present embodiment, as shown in figure 11, the reason of stator core 2 By can around groove area compared to typical round stator core stamping sheet shown in Figure 12 can around groove area improve 8.5%.Inflection point 2112 primarily serve the effect that curved circle release stress is carried out for stator core 2.

As shown in Fig. 2,15 and 16, in the present embodiment, rotor core 3 is connected by two groups of full crossover formula laminations 31 and one and partly 32 axial backmixing closed assembly of bridge-type lamination forms, and two groups of full crossover formula laminations 31 are located at the both ends of rotor core 3, and two groups connect entirely Bridge-type lamination 31 is axial to sandwich half crossover formula lamination 32, and half crossover formula lamination 32 is by multi-disc punching B closed assembly shape as shown in Figure 5 At full crossover formula lamination 31 is formed by punching A closed assembly as shown in FIG. 6, and punching A31 and punching B32 are axially provided with through-hole, is used Plastic material is penetrated through by through-hole and carries out wrapped strengthening to rotor core 3, is positioned and is connected by rivet point 3113,3213,3223 It connects, it is A+B+A along axial closed assembly structure, one group complete that the through-hole edge of punching and the frontier distance of adjacent permanent magnet slot, which are 2.6mm, Crossover formula lamination 31 includes 10 punching A, and one and half crossover formula laminations 32 include 30 punching B, is turned with all being formed by punching B The motor of son is compared, and the back emf coefficient of the present embodiment motor improves 34.4%.

As shown in fig. 6, punching A be connect bridge architecture entirely, permanent magnet 4 selected by the present embodiment with a thickness of 5mm, narrow magnetic bridge 314 width are 0.8mm, and wide 313 width of magnetic bridge is 1.5mm, and magnetic bridge length is 2.8mm, and 312 width of support bridge is 1.2mm, such as Punching B shown in Fig. 5 is partly to connect bridge architecture, and narrow 325 width of magnetic bridge is 0.8mm, between partition-type support bridge 323 and permanent magnet 4 Away from for 2.5mm, by the optimization of above-mentioned parameter, the permanent magnet trough bottom at the paraxial place of rotor core 3 is greatly reduced from interlinked leakage, protects It is constant to demonstrate,prove other parameters, compares full-bridge connecting type rotor structure (as shown in Figure 7) respectively, without partition support bridge type structure (such as Fig. 8 It is shown) and the present embodiment Distribution of Magnetic Field (as shown in Figure 9), and calculate from interlinkage magnetic leakage factor (as shown in Figure 10), three can be obtained Certainly interlinkage magnetic leakage factor is respectively 0.207,0.065,0.018 to the slot bottom of kind structural electromotor, it was demonstrated that the present embodiment can greatly improve Power of motor density.

As shown in Figure 5, Figure 6, the external arc surface of punching A and punching B reduces torque ripple using five sections of batten structures, X=5 is taken, vibration noise of motor is improved, each rotor sections use this structure, i.e., intermediate one section of central angle concentric with stator Two sections of off-centre operation camber line batten and edge for being β 1 for the main batten of circular arc line of α and main batten or so two sections of adjacent central angles Central angle is that the straightway batten of β 2 should meet+2 β 1+2 β 2=36 ° of α as shown in figure 13.

By 5 sections of batten formula rotors of comparative analysis completely circular structure rotor, traditional three sections of arc construction rotors and the present embodiment, The unloaded back-emf aberration rate optimized is only 1.18% (analyzing 50 subharmonic), corresponding harmonic components such as Figure 14 institute Show.In the present embodiment, plastic shaping is carried out to rotor surface using tubular molding compound, and acquires motor highest structural failure and turns Speed is 19000rpm, more than 6 times of motor actual running speed or more, it was demonstrated that the rotor surface structure design of the present embodiment can guarantee The high sine of air-gap field and enough structural strengths.

Preferred embodiments of the present invention, still, the utility model and unlimited are described in detail in conjunction with attached drawing above Detail in above embodiment can be to the skill of the utility model in the range of the technology design of the utility model Art scheme carries out a variety of simple variants, these simple variants belong to the protection scope of the utility model.

It is further to note that specific technical features described in the above specific embodiments, in not lance It in the case where shield, can be combined in any appropriate way, in order to avoid unnecessary repetition, the utility model is to each No further explanation will be given for the possible combination of kind.

In addition, any combination can also be carried out between a variety of different embodiments of the utility model, as long as it is not disobeyed The thought for carrying on the back the utility model, equally should be considered as content disclosed in the utility model.

Claims (16)

1. a kind of high power density permanent magnet motor, which is characterized in that including casing, stator core, asymmetric mixed rotor iron Core, permanent magnet, axis, winding and Insulating frame；

The gap that the contact site of the stator core and the casing is formed between ground protection system, with the casing, which is formed, fills Domain；

The asymmetric mixed rotor iron core includes shaft lantern ring, axis hole, sector, connecting bridge and support protrusion, adjacent institute Sector is stated with different planar structures.

2. high power density permanent magnet motor as described in claim 1, which is characterized in that the stator core connects yoke by T-type tooth It encloses, the outer surface that the T-type tooth connects yoke is parallel with stator slot bottom, and T-type tooth connects the teeth portion of yoke and the boundary face in yoke portion is hung down Directly, T-type tooth connect yoke quantity it is equal with number of slots.

3. high power density permanent magnet motor as claimed in claim 2, which is characterized in that each T-type tooth connects yoke equipped with interior Outer two rivet points of different sizes, the size of outer rivet point are greater than the size of interior rivet point.

4. high power density permanent magnet motor as claimed in claim 2, which is characterized in that the outer boundary of the stator core is in just Polygonized structure；

The stator core and the casing connect in each T-type tooth the connection point contact of yoke, stator core and casing not in contact with Gap by injection packing material constitute region filling.

5. high power density permanent magnet motor as described in claim 1, which is characterized in that in an at least laminate, shaft set Ring punching is radially raised, forms connecting bridge, and the two neighboring connecting bridge has different width and length, connecting bridge It extends radially outward to form sector.

6. high power density permanent magnet motor as claimed in claim 5, which is characterized in that the shaft lantern ring of the laminate Punching all connects and composes full crossover formula lamination.

7. high power density permanent magnet motor as claimed in claim 5, which is characterized in that in same laminate, sector is not right Claim, two adjacent sectors are different from connecting bridge connecting place size.

8. high power density permanent magnet motor as claimed in claim 7, which is characterized in that be placed in the slot among the sector Permanent magnet, the polarity of the permanent magnet is different in two neighboring slot, and the corresponding shaft lantern ring punching is radially in slot Protrusion forms support bridge.

9. high power density permanent magnet motor as claimed in claim 7, which is characterized in that at least one described laminate, The shaft lantern ring punching extends radially outward to form protrusion, and the protrusion of adjacent two has different width and length Degree.

10. high power density permanent magnet motor as claimed in claim 9, which is characterized in that width it is small it is described protrusion with it is described Sector connection, the big protrusion of width are not connected to the sector.

11. high power density permanent magnet motor as claimed in claim 9, which is characterized in that the laminate sector and described turn The connection of axle sleeve loop section, forms half crossover formula lamination.

12. high power density permanent magnet motor as claimed in claim 9, which is characterized in that two adjacent sector areas differ.

13. high power density permanent magnet motor as claimed in claim 12, which is characterized in that placed in the slot among the sector There is permanent magnet, the polarity of the permanent magnet is different in two neighboring slot, and corresponding shaft lantern ring punching is radially prolonged in slot It stretches to form slot bottom protrusion.

14. high power density permanent magnet motor as claimed in claim 8, which is characterized in that the support bridge and the permanent magnet Contact.

15. high power density permanent magnet motor as claimed in claim 13, which is characterized in that the slot bottom protrusion not with it is described forever Magnet contact.

16. such as the described in any item high power density permanent magnet motors of claim 5-15, which is characterized in that the shaft lantern ring punching The external arc surface of piece includes the x sections of battens for reducing torque ripple, and the batten is arc section or straightway；

The x sections of batten includes at least one section of main batten in centre and sets up two sections of straightways of two sides separately.