CN209913682U - Two-pole embedded brushless direct current motor - Google Patents
Two-pole embedded brushless direct current motor Download PDFInfo
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- CN209913682U CN209913682U CN201921056497.3U CN201921056497U CN209913682U CN 209913682 U CN209913682 U CN 209913682U CN 201921056497 U CN201921056497 U CN 201921056497U CN 209913682 U CN209913682 U CN 209913682U
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Abstract
The utility model discloses an embedded brushless DC motor of dipolar, including stator and rotor, the rotor includes rotor core, is equipped with first magnetic pole unit, second magnetic pole unit on the rotor core, and is used for reducing the first magnetic bridge that separates of magnetic leakage between first magnetic pole unit and the second magnetic pole unit, and first magnetic pole unit includes the first magnetic groove that at least one radial was arranged, is equipped with first utmost point permanent magnet in every first magnetic groove, second magnetic pole unit includes the second magnetic groove that at least one radial was arranged, every be equipped with second utmost point permanent magnet in the second magnetic groove, the second magnetic groove corresponds the setting with first magnetic groove and is central symmetry and arranges. Embedded brushless DC motor of dipolar have the advantage that reduces the magnetic leakage and avoid magnet to throw away the breakage.
Description
Technical Field
The utility model belongs to the technical field of a brushless motor technique and specifically relates to an embedded brushless DC motor of dipolar.
Background
The vacuum cleaner is a cleaning electric appliance which utilizes a motor to drive a blade to rotate at a high speed, generates air negative pressure in a sealed shell and sucks dust and other sundries into a dust collecting bag. The electric blower of the dust collector is a core part of the dust collector and consists of two parts, namely a motor part and a blower part, and the electric blower of the dust collector has high requirement on the rotating speed, so that the conventional electric blower of the dust collector generally uses a brush motor, the rotating speed of the brush motor is usually between 2 ten thousand and 4 ten thousand revolutions, and although the rotating speed of the brush motor can meet the requirement of the electric blower of the dust collector, a commutator of the brush motor is fast in abrasion, short in service life, high in noise and low in performance. Compared with a brush motor, the brushless direct current motor adopts electronic commutation because the brush commutation is cancelled, the rotating speed can reach 6 to 10 thousands of revolutions, the service life reaches more than 2000 hours, and the noise can be effectively reduced.
The brushless direct current motor comprises a stator and a rotor, wherein the rotor comprises a rotating shaft and a neodymium iron boron magnetic ring arranged on the rotating shaft, when the rotor rotates at a high speed, the neodymium iron boron magnetic ring is subjected to a great centrifugal force, and the neodymium iron boron magnetic ring has the risk of being broken and separated from the rotating shaft. In order to fasten the ndfeb magnetic ring to the rotating shaft, a non-magnetic metal ring is usually sleeved on the outer circumferential surface of the ndfeb magnetic ring, however, when the rotor rotates at a high speed, a high frequency changing magnetic field generates a great eddy current loss in the metal ring, so that the operating efficiency of the brushless dc motor is reduced, the temperature is increased, and the magnetic ring is easily demagnetized. In addition, the conventional brushless direct current motor has a magnetic flux leakage phenomenon on a rotor.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to overcome prior art's defect, provide a reduce the magnetic leakage and avoid magnet to throw away broken embedded brushless DC motor of dipolar.
In order to achieve the above object, the utility model provides a following technical scheme: a two-pole embedded brushless DC motor comprises
The stator comprises a stator yoke portion and a plurality of stator tooth portions formed by inwards extending the inner side wall of the stator yoke portion, and a stator slot is formed between every two adjacent stator tooth portions;
the rotor, the rotor includes pivot and rotor core, be equipped with first magnetic pole unit, second magnetic pole unit on the rotor core, and be used for reducing the first magnetic bridge that separates of magnetic leakage between first magnetic pole unit and the second magnetic pole unit, first magnetic pole unit includes the first magnetic groove that at least one radial formula was arranged, is equipped with the first permanent magnet of first utmost point in every first magnetic groove, second magnetic pole unit includes the second magnetic groove that at least one radial formula was arranged, every be equipped with the second permanent magnet of second utmost point in the second magnetic groove, the second magnetic groove corresponds the setting with first magnetic groove and is central symmetry and arranges.
Preferably, the first magnetic isolation bridge is arranged between the adjacent first pole permanent magnet and the second pole permanent magnet, and the first magnetic isolation bridge is arranged close to the edge of the rotor core.
Preferably, the first magnetic isolation bridge is a circular through hole formed at an edge of the rotor core.
Preferably, the two ends of the first pole permanent magnet are respectively provided with a second magnetic isolation bridge, and the two ends of the second pole permanent magnet are respectively provided with a third magnetic isolation bridge.
Preferably, the number of the first magnetic grooves and the number of the second magnetic grooves are both M, and M is a natural number greater than or equal to 1.
Preferably, the first magnetic groove and the second magnetic groove are both rectangular grooves.
Preferably, the first pole permanent magnet is arranged in the first magnetic groove in a gluing or welding mode, and the second pole permanent magnet is arranged in the second magnetic groove in a gluing or welding mode.
Preferably, the rotor core has an outer circumferential surface, and a concave arc groove for reducing the cogging torque is formed by recessing the outer circumferential surface close to the first magnetic isolation bridge.
Preferably, the number of the stator slots is N, the two-pole embedded brushless dc motor is a two-pole M-slot embedded brushless dc motor, and N is a natural number greater than or equal to 2.
Preferably, a plurality of mounting space relief grooves for fixing the bolts of the stator are formed on the outer side wall of the stator yoke.
The utility model has the advantages that:
(1) through embedding first permanent magnet to first magnetic groove in, and with second permanent magnet embedding second magnetic groove in, reduced the quantity of the required material of preparation magnetic pole on the one hand, on the other hand can avoid first permanent magnet and second permanent magnet to be thrown away and broken problem when electric motor rotor is high-speed rotatory, has improved electric motor rotor's mechanical structure intensity, makes it more be fit for high-speed operation.
(2) Through setting up first magnetic bridge, second and third magnetic bridge that separates, effectively reduced the magnetic leakage between first magnetic pole unit and the second magnetic pole unit, between the first utmost point permanent magnet, and between the second utmost point permanent magnet.
Drawings
Fig. 1 is a schematic structural diagram of an embodiment of the present invention;
FIG. 2 is a schematic structural diagram of a second embodiment of the present invention;
FIG. 3 is a schematic diagram of a third embodiment of the present invention;
fig. 4 is a schematic structural diagram of the fourth embodiment of the present invention;
fig. 5 is a schematic structural diagram of a fifth embodiment of the present invention;
fig. 6 is an enlarged schematic view of a portion a of fig. 4.
Reference numerals: 10. the magnetic circuit comprises a stator, 11, a stator yoke part, 111, a abdicating groove, 12, a stator tooth part, 121, a stator winding, 13, a stator groove, 20, a rotor, 21, a rotating shaft, 22, a rotor core, 23, a first magnetic pole unit, 231, a first magnetic groove, 232, a first pole permanent magnet, 24, a second magnetic pole unit, 241, a second magnetic groove, 242, a second pole permanent magnet, 25, a first magnetic isolation bridge, 26, a second magnetic isolation bridge, 27, a third magnetic isolation bridge, 28 and a concave arc groove.
Detailed Description
The technical solution of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings of the present invention.
Referring to fig. 1 to 5, a two-pole embedded brushless dc motor according to the present invention includes a stator 10 and a rotor 20. Specifically, the stator 10 includes a stator yoke 11 and a plurality of stator teeth 12 integrally formed on the stator yoke 11, the stator teeth 12 are provided with stator windings 121 formed by winding enameled wires, and a stator slot 13 is formed between two adjacent stator teeth 12, wherein the stator yoke 11 is in a circular ring shape and has an outer side wall and an inner side wall which are oppositely arranged, and the stator teeth 12 are formed by extending the inner side wall of the stator yoke 11 towards the rotor 20. Further, a plurality of receding grooves 111 are formed in the outer side wall of the stator yoke 11, and the receding grooves 111 are formed by the outer side wall of the stator yoke 11 being recessed towards the rotor 20, and are used for providing mounting space for fixing the bolts of the stator 10.
As shown in fig. 1 to 5, the rotor 20 includes a rotating shaft 21 and a rotor core 22, wherein the rotor core 22 is sleeved on the rotating shaft 21, the rotor core 22 is provided with a first magnetic pole unit 23, a second magnetic pole unit 24 and a first magnetic isolation bridge 25, and the first magnetic isolation bridge 25 is disposed at a junction of the first magnetic pole unit 23 and the second magnetic pole unit 24 and is used for reducing magnetic leakage between the first magnetic pole unit 23 and the second magnetic pole unit 24.
In this embodiment, the first magnetic isolation bridge 25 is a circular through hole formed at the edge of the rotor core 22, and certainly, the structure of the first magnetic isolation bridge 25 is not limited to the circular through hole structure, and the first magnetic isolation bridge 25 can be set according to actual requirements during implementation, such as setting the first magnetic isolation bridge 25 as a square through hole formed at the edge of the rotor core 22.
The first magnetic pole unit 23 includes at least one first magnetic slot 231 arranged radially, and a first pole permanent magnet 232 is disposed in each first magnetic slot 231. The second magnetic pole unit 24 includes at least one second magnetic slot 241 arranged radially, a second pole permanent magnet 242 is arranged in each second magnetic slot 241, the second magnetic slot 241 is arranged corresponding to the first magnetic slot 231 and arranged in a central symmetry manner, and in the specific implementation, the first magnetic slot 231 and the second magnetic slot 241 corresponding to the first magnetic slot 231 are optimally arranged in parallel.
Further, the first magnetic isolation bridge 25 is disposed between the adjacent first pole permanent magnets 232 and second pole permanent magnets 242, and the first magnetic isolation bridge 25 is disposed near the edge of the rotor core 22. Meanwhile, in order to reduce the magnetic leakage between the first pole permanent magnets 232 and between the second pole permanent magnets 242, the second magnetic isolation bridges 26 are respectively disposed at two ends of the first pole permanent magnets 232, and the third magnetic isolation bridges 27 are respectively disposed at two ends of the second pole permanent magnets 242.
In this embodiment, the first pole permanent magnet 232 is disposed in the first magnetic slot 231 by gluing or welding, and the second pole permanent magnet 242 is disposed in the second magnetic slot 241 by gluing or welding, and in specific implementation, it is most preferable that the first pole permanent magnet 232 and the second pole permanent magnet 242 are disposed in the first magnetic slot 231 and the second magnetic slot 241 by gluing. First magnetic pole unit 23 forms evenly distributed N-pole magnetic field on the surface of rotor core 22, and second magnetic pole unit 24 forms evenly distributed S-pole magnetic field on the surface of rotor core 22, and certainly, can set for according to actual need during specific implementation, make first magnetic pole unit 23 form evenly distributed S-pole magnetic field on the surface of rotor core 22, and second magnetic pole unit 24 forms evenly distributed N-pole magnetic field on the surface of rotor core 22.
Furthermore, the number of the first magnetic slots 211 in the first magnetic pole unit 21 and the number of the second magnetic slots 221 in the second magnetic pole unit 22 are both M, where M is a natural number greater than or equal to 1. If the number of the first magnetic slots 211 in the first magnetic pole unit 21 and the number of the second magnetic slots 221 in the second magnetic pole unit 22 are both 1, as shown in fig. 1 to 3, and if the number of the first magnetic slots 211 in the first magnetic pole unit 21 and the number of the second magnetic slots 221 in the second magnetic pole unit 22 are both 2, as shown in fig. 4, and if the number of the first magnetic slots 211 in the first magnetic pole unit 21 and the number of the second magnetic slots 221 in the second magnetic pole unit 22 are both 3, as shown in fig. 5.
In this embodiment, the first magnetic slot 231 and the second magnetic slot 241 are rectangular slots, and in implementation, the structures of the first magnetic slot 231 and the second magnetic slot 241 can be set according to actual requirements, for example, the first magnetic slot 231 and the second magnetic slot 241 are set to be arc-shaped slots or slots with other irregular shapes.
As shown in fig. 6, the rotor core 22 has an outer circumferential surface, and in order to reduce cogging torque, the outer circumferential surface of the rotor core 22 near the first magnetic bridges 25 is recessed inward to form concave arc grooves 28.
Embedded brushless DC motor of dipolar, stator 10 goes up the quantity of stator slot 13, is N if the quantity of stator slot 13, the embedded brushless DC motor of dipolar of final constitution is the embedded brushless DC motor of two poles of the earth N groove, N is more than or equal to 2's natural number.
Specifically, fig. 1 shows a two-pole two-slot embedded brushless dc motor, wherein the number of stator slots 13 on the stator 10 is 2, and the number of first magnetic slots 231 in the first magnetic pole unit 23 and the number of second magnetic slots 241 in the second magnetic pole unit 24 on the rotor 20 are both 1.
Fig. 2 shows a two-pole four-slot embedded brushless dc motor, wherein the number of the stator slots 13 on the stator 10 is four, and the number of the first magnetic slots 231 in the first magnetic pole unit 23 and the number of the second magnetic slots 241 in the second magnetic pole unit 24 on the rotor 20 are both 1.
Fig. 3 to 5 show two-pole six-slot embedded brushless dc motors, wherein the number of the stator slots 13 on the stator 10 is six, the number of the first magnetic slots 231 in the first magnetic pole unit 23 and the number of the second magnetic slots 241 in the second magnetic pole unit 24 on the rotor 20 are both 1, or the number of the first magnetic slots 231 in the first magnetic pole unit 23 and the number of the second magnetic slots 241 in the second magnetic pole unit 24 are both 2, or the number of the first magnetic slots 231 in the first magnetic pole unit 23 and the number of the second magnetic slots 241 in the second magnetic pole unit 24 are both 3.
Embedded brushless DC motor of dipolar, through imbedding first utmost point permanent magnet 232 to first magnetic groove 231 in, and with second utmost point permanent magnet 242 embedding second magnetic groove 241 in, the quantity of required material when having reduced the preparation magnetic pole on the one hand, first utmost point permanent magnet 232 and second utmost point permanent magnet 242 are thrown away and broken problem when on the other hand can avoid electric motor rotor 20 high-speed rotatory, improved electric motor rotor 20's mechanical structure intensity, make it more be fit for high-speed operation.
The technical contents and features of the present invention have been disclosed as above, however, those skilled in the art can still make various substitutions and modifications based on the teaching and disclosure of the present invention without departing from the spirit of the present invention, therefore, the protection scope of the present invention should not be limited to the contents disclosed in the embodiments, but should include various substitutions and modifications without departing from the present invention, and should be covered by the claims of the present patent application.
Claims (10)
1. A two-pole embedded brushless DC motor is characterized by comprising
The stator comprises a stator yoke portion and a plurality of stator tooth portions formed by inwards extending the inner side wall of the stator yoke portion, and a stator slot is formed between every two adjacent stator tooth portions;
the rotor, the rotor includes pivot and rotor core, be equipped with first magnetic pole unit, second magnetic pole unit on the rotor core, and be used for reducing the first magnetic bridge that separates of magnetic leakage between first magnetic pole unit and the second magnetic pole unit, first magnetic pole unit includes the first magnetic groove that at least one radial formula was arranged, is equipped with the first permanent magnet of first utmost point in every first magnetic groove, second magnetic pole unit includes the second magnetic groove that at least one radial formula was arranged, every be equipped with the second permanent magnet of second utmost point in the second magnetic groove, the second magnetic groove corresponds the setting with first magnetic groove and is central symmetry and arranges.
2. The two-pole embedded brushless direct current motor according to claim 1, wherein the first magnetic isolation bridge is disposed between adjacent first and second pole permanent magnets, and the first magnetic isolation bridge is disposed near an edge of the rotor core.
3. The two-pole embedded brushless dc motor according to claim 1 or 2, wherein the first magnetic bridge is a circular through hole formed at an edge of the rotor core.
4. The two-pole embedded brushless DC motor according to claim 1, wherein the first pole permanent magnet is provided with second magnetic isolation bridges at both ends thereof, and the second pole permanent magnet is provided with third magnetic isolation bridges at both ends thereof.
5. The diode embedded brushless dc motor according to claim 1, wherein the first and second magnetic slots are each M in number, M being a natural number greater than or equal to 1.
6. The two-pole embedded brushless DC motor according to claim 1, wherein the first and second magnetic slots are rectangular slots.
7. The two-pole embedded brushless direct current motor according to claim 1, wherein the first pole permanent magnet is disposed in the first magnetic slot by gluing or welding, and the second pole permanent magnet is disposed in the second magnetic slot by gluing or welding.
8. The two-pole embedded brushless direct current motor according to claim 1, wherein the rotor core has an outer circumferential surface, and a concave arc groove for reducing cogging torque is formed by recessing the outer circumferential surface adjacent to the first magnetic isolation bridge.
9. The two-pole embedded brushless DC motor according to claim 1, wherein the number of the stator slots is N, the two-pole embedded brushless DC motor is a two-pole N-slot embedded brushless DC motor, and N is a natural number greater than or equal to 2.
10. The diode embedded brushless DC motor according to claim 1, wherein a plurality of relief grooves for providing a mounting space for bolts fixing the stator are formed on an outer sidewall of the stator yoke.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921056497.3U CN209913682U (en) | 2019-07-08 | 2019-07-08 | Two-pole embedded brushless direct current motor |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921056497.3U CN209913682U (en) | 2019-07-08 | 2019-07-08 | Two-pole embedded brushless direct current motor |
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| Publication Number | Publication Date |
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| CN209913682U true CN209913682U (en) | 2020-01-07 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201921056497.3U Active CN209913682U (en) | 2019-07-08 | 2019-07-08 | Two-pole embedded brushless direct current motor |
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| CN (1) | CN209913682U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110311528A (en) * | 2019-07-08 | 2019-10-08 | 苏州市润豪电机有限公司 | A kind of two extremely embedded brshless DC motors |
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2019
- 2019-07-08 CN CN201921056497.3U patent/CN209913682U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110311528A (en) * | 2019-07-08 | 2019-10-08 | 苏州市润豪电机有限公司 | A kind of two extremely embedded brshless DC motors |
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