CN202818052U - Brushless DC motor with magnetic steel built therein - Google Patents
Brushless DC motor with magnetic steel built therein Download PDFInfo
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- CN202818052U CN202818052U CN2012203494067U CN201220349406U CN202818052U CN 202818052 U CN202818052 U CN 202818052U CN 2012203494067 U CN2012203494067 U CN 2012203494067U CN 201220349406 U CN201220349406 U CN 201220349406U CN 202818052 U CN202818052 U CN 202818052U
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- magnet steel
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- built
- rotor core
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Abstract
The utility model relates to a brushless DC motor with a magnetic steel built therein, comprising connected stator and rotor, wherein the rotor comprises a bearing, a rotation shaft, a rotor core and magnetic steels, the bearing is connected with the rotation shaft, the rotation shaft is arranged inside the rotor core, the rotor core is uniformly provided with a natural number of square hole pairs, and the magnetic steels are arranged inside the square holes. Compared with the prior art, the brushless DC motor with a magnetic steel built therein has the advantages of being low in price, good in manufacture technique, high in reliability, etc.
Description
Technical field
The utility model relates to a kind of brushless DC motor, especially relates to the built-in brushless DC motor of a kind of magnet steel.
Background technology
In the textile machine, moment of inertia such as bobbin-winding machine is large, stops (processing rapidly during short-term, boost productivity) for the efficient high-speed operation reaches to start rapidly, require the drive motors of large torque, the sintered rare-earth permanent magnetic magnetic steel rotor shape brushless electric machine of pasting with the surface in recent years is applied.Chinese patent CN201113745Y discloses a kind of brushless, permanently excited direct current motor, comprise casing, front end housing, rear end cap, stator, rotor and position transducer, described stator, rotor and position transducer all are installed in the described casing, described front end housing and rear end cap are installed on respectively the two ends of described casing, described rotor comprises iron core and at least one pair of magnet steel, described magnet steel is arranged at the periphery of described iron core, and the cross section of described magnet steel is that interior thickness is greater than the arc of two edges thickness; Described magnet steel is fixedly connected with by viscose glue with described iron core, and described rotor also comprises steel bushing, is socketed on the outside of described iron core and described magnet steel.
The said motor rotor magnetic steel adopts surperficial bonding method, and shortcoming is that the large price rotor manufacture process of magnet steel consumption is complicated, and during high speed magnet steel to fly away from dangerous reliability bad, limited the rotating speed of motor.For preventing that magnet steel from flying away from rotor surface and will overlap steel bushing, thus steel bushing produce eddy current loss make electric efficiency reduce simultaneously cost increases complex process.
Summary of the invention
The purpose of this utility model is exactly to provide the magnet steel that a kind of price is low, manufacturing process good, rotating speed is high, reliability is high built-in brushless DC motor for the defective that overcomes above-mentioned prior art existence.
The purpose of this utility model can be achieved through the following technical solutions:
The built-in brushless DC motor of a kind of magnet steel, comprise the stator and the rotor that are connected, described rotor comprises bearing, rotating shaft, the protruding level of rotor core and magnet steel, described bearing is connected with rotating shaft, described rotating shaft bag is located at rotor core inside, evenly be provided with natural number on the described rotor core to square hole, described magnet steel is built in this square hole.
Described rotor core is made of silicon steel sheet.
Described magnet steel be shaped as rectangle, the size of the size of magnet steel and rotor core square hole is complementary.
Be provided with air gap between the protruding level of described rotor core and the stator.
The ratio of described rotor number of poles and number of stator slots is 2: 3.
The magnetic bridge a of described rotor core satisfies a<3d, and wherein, d is the thickness of silicon steel sheet.
The polar arc angle B of described rotor satisfies 360/S<B<360/P.
Compared with prior art, the utility model adopts magnet steel to embed the inner mode of rotor core and compares with existing surface magnetic steel bonding method, and the magnetic resistance of magnetic circuit reduces, and it is about 30% that the amount that produces the used magnet steel of same electromagnetic torque has reduced, and significantly reduced motor cost.Magnet steel is built in and has saved the surface in the iron core and add steel bushing technique, and the danger of having flown away from when having solved simultaneously the rotor magnetic steel high speed has improved the reliability of device.Make simultaneously higher rotating speed operation become possibility, improve quality for boosting productivity and contribute.
Description of drawings
Fig. 1 is structural representation of the present utility model.
Embodiment
Below in conjunction with the drawings and specific embodiments the utility model is elaborated.
Embodiment
As shown in Figure 1, the built-in brushless DC motor of a kind of magnet steel, comprise the stator 1 and the rotor that are connected, described rotor comprises bearing, rotating shaft 4, rotor core 2 and magnet steel 3, described bearing is connected with rotating shaft 4, described rotating shaft 4 bags are located at rotor core 2 inside, evenly are provided with natural number to square hole on the described rotor core 2, and described magnet steel 3 is located in this square hole.Magnet steel 3 be shaped as rectangle, the size of magnet steel and the size of square hole are complementary.Be provided with air gap between described rotor core 4 salient poles and the stator 1.
The ratio of rotor number of poles P and number of stator slots S satisfies P: S=2: 3, and useful flux is large.P=4 in the present embodiment, S=6.Rotor core 2 is made of silicon steel sheet, if the thickness of silicon steel sheet is d, then the magnetic bridge a of rotor core 2 satisfies a<3d, reduces leakage field, increases main magnetic flux, increases the output torque, and the thickness of silicon steel sheet is d=0.5 in the present embodiment, the magnetic bridge a=1 of rotor core 2; If the rotor pole arc angle is B, then B satisfies 360/S<B<360/P, and the magnet steel cost performance is high, improves output power of motor, present embodiment rotor polar arc angle B=80 degree.
Claims (7)
1. built-in brushless DC motor of magnet steel, comprise stator and rotor, it is characterized in that, described rotor comprises bearing, rotating shaft, rotor core and magnet steel, described bearing is connected with rotating shaft, described rotating shaft bag is located at rotor core inside, evenly is provided with natural number on the described rotor core to square hole, and described magnet steel is built in this square hole.
2. the built-in brushless DC motor of a kind of magnet steel according to claim 1 is characterized in that described rotor core is made of silicon steel sheet.
3. the built-in brushless DC motor of a kind of magnet steel according to claim 1 is characterized in that, described magnet steel be shaped as rectangle, the size of magnet steel and the size of square hole are complementary.
4. the built-in brushless DC motor of a kind of magnet steel according to claim 1 is characterized in that, is provided with air gap between described rotor core and the stator.
5. the built-in brushless DC motor of a kind of magnet steel according to claim 1 is characterized in that, the ratio of described rotor number of poles P and number of stator slots S satisfies P:S=2:3.
6. the built-in brushless DC motor of a kind of magnet steel according to claim 2 is characterized in that, the magnetic bridge a of described rotor core satisfies a<3d, and wherein, d is the thickness of silicon steel sheet.
7. the built-in brushless DC motor of a kind of magnet steel according to claim 5 is characterized in that, the polar arc angle B of described rotor satisfies 360/S<B<360/P.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CN2012203494067U CN202818052U (en) | 2012-07-18 | 2012-07-18 | Brushless DC motor with magnetic steel built therein |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
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CN2012203494067U CN202818052U (en) | 2012-07-18 | 2012-07-18 | Brushless DC motor with magnetic steel built therein |
Publications (1)
Publication Number | Publication Date |
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CN202818052U true CN202818052U (en) | 2013-03-20 |
Family
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Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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CN2012203494067U Expired - Lifetime CN202818052U (en) | 2012-07-18 | 2012-07-18 | Brushless DC motor with magnetic steel built therein |
Country Status (1)
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CN (1) | CN202818052U (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN103580435A (en) * | 2012-07-18 | 2014-02-12 | 上海鸣志电器股份有限公司 | Magnetic steel built-in type brushless DC motor |
CN105591477A (en) * | 2016-03-07 | 2016-05-18 | 常州杰信电机有限公司 | Brushless motor |
-
2012
- 2012-07-18 CN CN2012203494067U patent/CN202818052U/en not_active Expired - Lifetime
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN103580435A (en) * | 2012-07-18 | 2014-02-12 | 上海鸣志电器股份有限公司 | Magnetic steel built-in type brushless DC motor |
CN105591477A (en) * | 2016-03-07 | 2016-05-18 | 常州杰信电机有限公司 | Brushless motor |
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Legal Events
Date | Code | Title | Description |
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C14 | Grant of patent or utility model | ||
GR01 | Patent grant | ||
CX01 | Expiry of patent term |
Granted publication date: 20130320 |
|
CX01 | Expiry of patent term |