CN209267410U - A kind of double magnetic pole permanent-magnet brushless DC electric machines - Google Patents
A kind of double magnetic pole permanent-magnet brushless DC electric machines Download PDFInfo
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- CN209267410U CN209267410U CN201920144120.7U CN201920144120U CN209267410U CN 209267410 U CN209267410 U CN 209267410U CN 201920144120 U CN201920144120 U CN 201920144120U CN 209267410 U CN209267410 U CN 209267410U
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Abstract
The utility model discloses a kind of double magnetic pole permanent-magnet brushless DC electric machines, including rotor, stator, the shell and rear end cap being set on the outside of stator, radial air gap is equipped between rotor and stator, rotor includes hollow rotating shaft and the magnet steel that is set in the shaft, magnet steel includes two magnetic poles, the magnetic pole is circumferentially distributed in the periphery of the shaft by N-S, stator includes stator core and the winding that stator core both ends are arranged in, stator core includes the stator punching of one group of stacking, and stator punching inner ring is provided with six tooth sockets being uniformly distributed circumferentially.Permanent-magnet brushless DC electric machine disclosed by the utility model is matched using integer slot, and magnetic pull symmetrically event keeps motor operation steady, radiating ribs and air duct is arranged, ensure that motor works reliably and with long-term.
Description
Technical field
The utility model belongs to the technical field of motor, and in particular to a kind of double magnetic pole permanent-magnet brushless DC electric machines.
Background technique
Permanent-magnet brushless DC electric machine is had been widely used with its superior speed adjusting performance and higher energy conversion efficiency in electricity
In sub-information, automatic field and defence equipment.Permanent-magnet brushless DC electric machine is mainly by permanent-magnet brushless DC electric machine ontology, position
Sensor device and electronic driver three parts composition.Motor body is made of stator and rotor, structure and alternating-current synchronous
Motor is similar, and the main distinction with AC permanent magnet synchronous motor is the mouse cage that rotor eliminates permanent magnet synchronous motor asynchronous starting
Winding.
Currently, common permanent-magnet brushless DC electric machine is all some small-power slow-speed of revolution in the market, it is special to can not meet
Demand purposes.Moreover, the magnet steel on rotor is limited by magnet steel tensile strength and fastening strength to be easy when motor runs at high speed
Fragmentation is fallen apart, and magnet steel is easy demagnetization by the effect of temperature, makes the severe life time reduction of motor.
Utility model content
The purpose of the utility model is to provide a kind of double magnetic pole permanent-magnet brushless DC electric machines, solve existing DC permanent-magnetic brushless
The small disadvantage of power of motor.
The technical solution adopted in the utility model is a kind of double magnetic pole permanent-magnet brushless DC electric machines, including rotor, stator,
The shell and rear end cap being set on the outside of stator are equipped with radial air gap between rotor and stator, rotor includes hollow rotating shaft and set
The magnet steel being located in shaft, the width of air gap are 2.8mm-3.5mm, and magnet steel is the whole magnet steel of annular, and magnet steel includes two magnetic poles,
Magnetic pole is circumferentially distributed in the periphery of the shaft by N-S, stator include stator core and be arranged in stator core both ends around
Group, stator core include the stator punching of one group of stacking, and stator punching inner ring is provided with six tooth sockets being uniformly distributed circumferentially.
The technical characteristics of the utility model also resides in,
Wherein, the width of air gap is 3mm.
Winding is three-phase star winding.
Tooth socket is symmetrical pentagon, and pentagonal bottom edge is pressed from both sides far from axle center, the pentagonal bottom edge and adjacent both sides
Angle is acute angle, and the angle on adjacent both sides and remaining both sides is obtuse angle.
Stator is provided with stator sheath on the side side of rotor, and stator sheath (12) is processed using titanium alloy TC 4
Production.
Fluted, the magnet steel insertion inside grooves, magnet steel is arranged in shaft on the lateral surface of one end end along phase
Outside is provided with rotor jacket, and rotor jacket uses titanium alloy TC 4 processing and fabricating.
Stator punching is made of 44V6 iron nickel-molybdenum alloy band.
Radiating ribs and air duct are provided between stator core and shell.
The utility model has the beneficial effects that magnet steel is that the annular of neodymium iron boron magnetic body N45UH production is whole using two magnetic poles
Body magnet steel avoids piece magnet steel bring rotor coaxial degree and is not easy the shortcomings that guaranteeing, greatly improves magnet steel integral strength,
It can ensure motor trouble free service at high temperature；Stator punching inner ring is provided with six tooth sockets being uniformly distributed circumferentially, integer
Slot proportion, magnetic pull is symmetrical therefore unilateral magnetic force is not present, it is made to run smoothly；Motor gas-gap is 3mm, makes cogging torque pole
It is low, electric machine iron core frequencies of eddy currents is minimized into (2000Hz)；By be provided between stator core and shell radiating ribs and
Stator core outer circle is skimmed in four air ducts, air duct, and stator core and stator winding have concentrated motor iron loss and copper olse, is electricity
Machine heat source, it is maximally efficient radiating mode that stator core outer circle is skimmed in air duct；Cooling fan is connected in tail end in motor work
It radiates, motor temperature rise is made to meet requirement, to guarantee that motor works reliably and with long-term；This practical double magnetic pole brushless, permanently
The revolving speed of direct current generator can reach 12.5 ten thousand and turn left the right side, and when revolving speed is 110,000 turns~12.5 ten thousand turns, electric efficiency is in high
It is worth range, when rated point revolving speed is 120,000 turns, the efficiency highest of motor；The utility model motor can be widely used in ultrahigh speed work
In industry equipment and military equipment field, motor performance is stablized.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of the utility model permanent-magnet brushless DC electric machine；
Fig. 2 is the left view of the utility model permanent-magnet brushless DC electric machine；
Fig. 3 is the E-E cross-sectional view of Fig. 2；
Fig. 4 is the schematic diagram of internal structure of the utility model permanent-magnet brushless DC electric machine；
Fig. 5 is the structural schematic diagram of stator punching in the utility model permanent-magnet brushless DC electric machine；
Fig. 6 is the winding configuration figure in the utility model permanent-magnet brushless DC electric machine；
Fig. 7 is the right view of the utility model permanent-magnet brushless DC electric machine；
Fig. 8 is electric current-speed curves of motor in the utility model embodiment；
Fig. 9 is efficiency-speed curves of motor in the utility model embodiment；
Figure 10 is motor torque constant-speed curves in the utility model embodiment；
Figure 11 is output power of motor-speed curves in the utility model embodiment；
Figure 12 is motor output torque-speed curves in the utility model embodiment；
Figure 13 is motor cogging torque curve in the utility model embodiment；
Figure 14 is motor gas-gap flux density curve in the utility model embodiment.
In figure, 1. rotors, 2. stators, 3. shells, 4. rear end caps, 5. air gaps, 6. shafts, 7. magnet steel, 8. stator cores, 9.
Winding, 10. stator punchings, 11. tooth sockets, 12. stator sheaths, 13. rotor jackets, 14. air ducts.
Specific embodiment
The utility model is described in further detail with reference to the accompanying drawings and detailed description, but the utility model
It is not limited to the specific embodiment.
Referring to Figures 1 and 2, a kind of double magnetic pole permanent-magnet brushless DC electric machines of the utility model, including rotor 1, stator 2, set
It is located at the shell 3 and rear end cap 4 in 2 outside of stator, radial air gap 5 is equipped between rotor 1 and stator 2, the width of air gap is 3mm,
Keep cogging torque extremely low；Rotor 1 includes hollow rotating shaft 6 and the magnet steel 7 being set in the shaft 6, and magnet steel 7 includes two magnetic
Pole, magnetic pole are circumferentially distributed in the periphery of the shaft 6 by N-S, and magnet steel 7 is that the annular of neodymium iron boron magnetic body N45UH production is whole
Magnet steel avoids piece magnet steel bring rotor coaxial degree and is not easy the shortcomings that guaranteeing, greatly improves magnet steel integral strength, the material
Material Curie temperature reaches 180 DEG C, it can be ensured that motor trouble free service at high temperature；For magnet steel along axial charging, air gap flux density is flat
Top accounts for 80% of wavelength or more, for square wave driving motor, can obtain 2% motor operation torque ripple below, property
It can be excellent.
Referring to Fig. 3 and Fig. 4, shaft 6 is fluted along phase setting on the lateral surface of one end end, and magnet steel 7 is embedded in recessed
Inside slot, rotor jacket 13 is provided on the outside of magnet steel 7, rotor jacket 13 uses titanium alloy TC 4 processing and fabricating, and titanium alloy has pole
High density strength ratio, can protect rotor permanent magnet to be safely operated；It is solid by DG-2 adhesive between magnet steel and rotor jacket
Fixed connection, the adhesive strength of DG-2 adhesive is excellent and is resistant to 250 DEG C of high temperature.
Shaft selects 30CrMnSi production, and the material magnetic property is excellent, it can be ensured that rotor magnetic circuit is unsaturated, simultaneously should
Material bending strength is high, and the shaft suitable for super high speed motor is processed.
Referring to Fig. 5, stator 2 includes stator core 8 and the winding 9 that 8 both ends of stator core are arranged in, and stator core 8 includes
The stator punching 10 of one group of stacking, 10 inner ring of stator punching are provided with six tooth sockets 11 being uniformly distributed circumferentially, and tooth socket 11 is
Symmetrical pentagon, far from axle center, pentagonal bottom edge and adjacent both sides angle are acute angle on pentagonal bottom edge, adjacent both sides with
The angle on remaining both sides is obtuse angle.
Stator punching 10 is made of Germany ULTRAVAC 44V6 iron nickel-molybdenum alloy band, and iron loss factor is only ordinary silicon
The 1/3 of steel disc, saturation magnetic induction is relatively low, is 1.35T, and oOrdinary silicon steel sheet saturation magnetic induction is 1.7T.Stator winding 9 is three-phase star
Winding, winding select 220 DEG C of temperature resistant grade of QY-2 polyimides enamelling cuprum round line, motor are made to be resistant to 220 DEG C of high temperature
It does not damage (see Fig. 6).In inside and outside circle, all there are machining allowance when stator punching is processed, and are integrally laminated with punching excircle orientation laggard
Row winding inserting and shaping carry out winding dipping lacquer later to strengthen stator insulation and solidify machine winding.Finally respectively with stator
The inside and outside round location mill processing stator core outer circle of iron core and inner circle, make stator core have high internal-external circle concentricity, to the greatest extent may be used
Can be reduced due to machining error generate rotor unilateral magnetic force, and then may cause trembling, noise phenomena such as.It is fixed
Sub- punching is processed using high-precision low-speed WEDM, reduces the rotor list generated due to machining error as far as possible
Side magnetic pull, so may cause trembling, noise phenomena such as.
Stator 2 is provided with stator sheath 12 on the side side of rotor, and stator sheath is thin-walled parts, and when processing is first
Machining allowance, sheath outer circle and iron core inner hole are reserved using being interference fitted in stator jacket inner wall, and sheath uses after being installed in place
Stator sheath wall thickness is worked into position by Vehicle Processing；Stator sheath 12 uses titanium alloy TC 4 processing and fabricating, and titanium alloy material is not led
Magnetic does not generate eddy-current loss inside sheath in rotor high speed rotation, can make motor using stator sheath support stator inner hole
Stator inner hole forms smooth bucket wall, and the air-flow for preventing rotor from taking up hinders air-cooled air-flow logical in the unordered flowing of stator teeth
It crosses, third titanium alloy thermal coefficient is lower, and the heat that can generate stator stops, and prevents rotor from overheating, permanent magnet magnetic
Performance decline.
Referring to Fig. 7, radiating ribs and four air ducts 14 are provided between stator core 8 and shell 3, stator core is skimmed in air duct
Outer circle, stator core and stator winding have concentrated motor iron loss and copper olse, are motor heat sources, therefore stator iron is skimmed in air duct
Heart outer circle is maximally efficient radiating mode.It radiates in motor work in tail end connection cooling fan, expires motor temperature rise
Sufficient requirement, to guarantee that motor works reliably and with long-term.
The fit tolerance of stator outer circle and shell inner hole selects interference fit, and electric machine casing is heated when assembly to 180 DEG C, and
Stator module is cooled to -10 DEG C, guarantees that stator module slides into electric machine casing inner hole by tooling, avoids extrusion operation, it is easy
Feasible, assembly effect is good.
Casing uses aluminum alloy materials, is conducive to heat dissipation.Since casing and stator core adhere to different materials, thermal expansion coefficient separately
Difference, tolerance, which is chosen, to be needed to guarantee motor within the temperature range of -60 DEG C~250 DEG C, and stator module does not loosen, and motor is reliable
Operation.Rear end cap outer circle and casing inner hole are cooperated using slight interference, processed using the aluminium alloy of identical material due to the two and
Rear end cap does not play support or bears torque, which can simplify installation steps, guarantees that assembly is reliable.
The stator tooth flux density and stator yoke flux density of motor are respectively less than 1T, and iron loss is smaller.
By Maxwell 2D software emulation platform to each in the magnetic circuit and the motor course of work of motor in the present embodiment
The flux density of magnetic circuit carries out simulation analysis, and analysis result is as follows:
(1) analytical calculation is carried out to the motor stator flux density figure and motor stator flux density average value, the results show that the electricity
For machine under load operation conditions, maximum magnetic induction comes across stator teeth, about 1.2T, while stator yoke maximum magnetic strength
Answering intensity is about 1T, and each magnetic circuit flux density is in unsaturated state, and to avoid magnetic flux leakage caused by motor high-magnetodensity, motor is fixed
Sub- tooth flux density average value is 0.914T, and motor stator yoke flux density average value is 0.917T.
(2) motor performance is calculated, the results are shown in Table 1 for accounting:
The electrical property of motor calculates result in 1 the present embodiment of table
In addition, can obtain 164 watts of motor iron loss by accounting result, 148 watts of copper olse, the two is close.
(3) electric current-speed curves of motor are from the figure as shown in figure 8, can be seen that, motor 50000rpm~
Within the scope of 125000rpm, electric current is in exact linear relationship with load variation and revolving speed, and motor performance is stable, reliable, is not operated in
Current distortion area.
(4) efficiency-speed curves of motor are as shown in Figure 9, it is seen that motor within the scope of 110000rpm~125000rpm,
Efficiency is in extremely high value range, and rated point revolving speed 120000rpm is just electric efficiency highest point, and the setting of Rated motor point is reasonable.
(5) torque constant-speed curves of motor are as shown in Figure 10, it is seen that motor is in 50000rpm~125000rpm model
In enclosing, torque constant is in exact linear relationship with load variation and revolving speed, and motor performance is stable, reliable, and it is normal not operate in torque
Number distortion area.
(6) output power-speed curves of motor are as shown in figure 11, it is seen that motor is in 110000rpm~125000rpm model
In enclosing, output power is in exact linear relationship with load variation and revolving speed, and motor performance is stable, reliable, does not operate in output work
Rate distortion area.
(7) output torque-speed curves of motor are as shown in figure 12, it is seen that motor is in 100000rpm~125000rpm model
In enclosing, output torque and revolving speed are in exact linear relationship, and motor performance is stable, reliable, do not operate in torque distortion area.
(8) the cogging torque curve of motor is as shown in figure 13, it is seen that the cogging torque peak value of motor be 0.00224N.m with
The ratio of nominal torque is only 0.43%, which is designed using straight trough, while using big air-gap design, weakens motor gas
Gap flux density not will cause shake and additional disturbance in motor operation course, in turn result in reduce motor cogging torque
There is additional load in bearing test.
(9) airgap density distribution curve of motor is as shown in figure 14, it is seen that the air gap flux density of motor is the waveform close to square wave.It should
Motor is Novel direct-current brushless motor, and air gap flux density square wave feature is better, then it is lower to run torque ripple.The motor gas-gap
Flux density is the waveform cutting top by sine wave and generating close to square wave.
Claims (8)
1. a kind of double magnetic pole permanent-magnet brushless DC electric machines, including rotor (1), stator (2), the shell being set on the outside of stator (2)
(3) and rear end cap (4) radial air gap (5), are equipped between the rotor (1) and stator (2), the rotor (1) includes hollow turn
Axis (6) and the magnet steel (7) being set on the shaft (6), which is characterized in that the width of the air gap (5) is 2.8mm-
3.5mm, the magnet steel (7) are the whole magnet steel of annular, and the magnet steel (7) includes two magnetic poles, and the magnetic pole is circumferentially by N-S points
For cloth in the periphery of the shaft (6), the stator (2) includes the winding of stator core (8) and setting at stator core (8) both ends
(9), the stator core (8) includes the stator punching (10) of one group of stacking, and stator punching (10) inner ring is provided with circumferentially
Six tooth sockets (11) of even distribution.
2. a kind of double magnetic pole permanent-magnet brushless DC electric machines according to claim 1, which is characterized in that the air gap (5)
Width is 3mm.
3. a kind of double magnetic pole permanent-magnet brushless DC electric machines according to claim 1, which is characterized in that the winding (9) is
Three-phase star winding.
4. a kind of double magnetic pole permanent-magnet brushless DC electric machines according to claim 1, which is characterized in that the tooth socket (11) is
Symmetrical pentagon, far from axle center, the pentagonal bottom edge and adjacent both sides angle are acute angle on pentagonal bottom edge, adjacent two
The angle on side and remaining both sides is obtuse angle.
5. a kind of double magnetic pole permanent-magnet brushless DC electric machines according to claim 1, which is characterized in that the stator (2) is leaned on
It is provided with stator sheath (12) on the side side of nearly rotor (1), stator sheath (12) uses titanium alloy TC 4 processing and fabricating.
6. a kind of double magnetic pole permanent-magnet brushless DC electric machines according to claim 1, which is characterized in that the shaft (6) is leaned on
Fluted, magnet steel (7) insertion inside grooves, magnet steel (7) outside are set on the lateral surface of nearly one end end along phase
It is provided with rotor jacket (13), rotor jacket (13) uses titanium alloy TC 4 processing and fabricating.
7. a kind of double magnetic pole permanent-magnet brushless DC electric machines according to claim 1, which is characterized in that the stator punching
(10) it is made of 44V6 iron nickel-molybdenum alloy band.
8. a kind of double magnetic pole permanent-magnet brushless DC electric machines according to claim 1, which is characterized in that the stator core
(8) radiating ribs and air duct (14) are provided between shell (3).
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| Application Number | Priority Date | Filing Date | Title |
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| CN201920144120.7U CN209267410U (en) | 2019-01-28 | 2019-01-28 | A kind of double magnetic pole permanent-magnet brushless DC electric machines |
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| CN201920144120.7U CN209267410U (en) | 2019-01-28 | 2019-01-28 | A kind of double magnetic pole permanent-magnet brushless DC electric machines |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109639085A (en) * | 2019-01-28 | 2019-04-16 | 西安广源机电技术有限公司 | A kind of magnet brushless |
| CN115622343A (en) * | 2022-12-16 | 2023-01-17 | 西门子电机(中国)有限公司 | Method, device, equipment and medium for determining chute angle of motor rotor |
-
2019
- 2019-01-28 CN CN201920144120.7U patent/CN209267410U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109639085A (en) * | 2019-01-28 | 2019-04-16 | 西安广源机电技术有限公司 | A kind of magnet brushless |
| CN115622343A (en) * | 2022-12-16 | 2023-01-17 | 西门子电机(中国)有限公司 | Method, device, equipment and medium for determining chute angle of motor rotor |
| CN115622343B (en) * | 2022-12-16 | 2023-02-28 | 西门子电机(中国)有限公司 | Method, device, equipment and medium for determining chute angle of motor rotor |
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