CN1797911A - Rare earth permanent magnet brushless DC motor for dentistry chair seat - Google Patents
Rare earth permanent magnet brushless DC motor for dentistry chair seat Download PDFInfo
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- CN1797911A CN1797911A CN 200410073462 CN200410073462A CN1797911A CN 1797911 A CN1797911 A CN 1797911A CN 200410073462 CN200410073462 CN 200410073462 CN 200410073462 A CN200410073462 A CN 200410073462A CN 1797911 A CN1797911 A CN 1797911A
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Abstract
The DC motor includes stator, rotor, end covers and sensor set inside case body. Technical characters of the invention are that iron core of stator is produced by piling up silicon steel sheets; being jointed and embedded each other, two pieces of annular magnet steel in same performance are stuck on rotor yoke constitute rotor magnet steel; magnet steel of sensor is stuck on bracket installed on shaft connected to coaxial rotor yoke; being at in front of rotor shaft, screw worm is engaged with worm so as to convert rotation with axial direction of motor as normal direction to rotation with radial direction of motor as normal direction. Comparing with asynchronous motor in single phase and brush type DC motor for dentistry chair seat, the disclosed motor possesses advantages of noise less than 40 db, small pulsant torque, and high security and efficiency.
Description
Technical field
The present invention relates to a kind of rare earth permanent magnet brushless DC motor for dentistry chair seat, be used for the driving of dentistry chair seat mechanism.
Background technology:
At present, commercially available dentistry chair seat mechanism is single-phase asynchronous motor or the brush direct current machine is arranged with drive motors.Single-phase asynchronous motor adopts the 220V single-phase alternating current, because in use, entire mechanism contacts with human body possibly, easily produces dangerously, so its fail safe, reliability are not high.With the exception of this, also have that volume is big, heavy, inefficient shortcoming.Employing has the brush direct current machine, though overcome the defective of single-phase asynchronous motor aspect fail safe and volume weight, and on efficient, also improve, but have the brush direct current machine to adopt brush---the commutator commutation, there is commutation spark, and noise is big, electromagnetic interference is serious, and these shortcomings tend to bring very important influence to the medical treatment electronic equipment in hospital, the sanatorium.Mechanical commutation causes wear of brush in addition, causes its life-span not long, and maintainability is not high.
Summary of the invention
The technical problem that solves
For fear of the deficiencies in the prior art part, the present invention proposes a kind of rare earth permanent magnet brushless DC motor for dentistry chair seat.
Technical scheme
Technological thought of the present invention is: be included in stator, rotor, end cap and sensor cluster in the housing 1, technical characterictic is: the iron core 5 of described stator is overrided to form by number of metal silicon steel sheet 20, embeds in casing 1 inside; The magnet steel 3 of described rotor is spliced by two identical annular magnetic steels of performance, and is nested and be pasted on the rotor yoke 17.Exert oneself etc. on the basis of performance not influencing motor thus, reduced the difficulty that magnetizes of magnet steel, effectively reduced the cost of motor.The magnet steel 8 of described transducer sticks on the transducer magnet steel support 10, and sensor stand 10 is fitted in the rotating shaft 2, with 17 coaxial linking to each other of rotor yoke.The design that is integrated of sensor stand 10 and rotor yoke 17, assurance is to the accurate induction of motor rotor position.Between housing 1 and the end cap 7 rubber insulator is arranged; The front end of armature spindle 2 is a screw-rod structure 19, is meshed with worm gear 26 on the worm-wheel shaft 25.The worm structure of armature spindle 2 front ends, in conjunction with the worm gear on the end cap 7, can be with motor axially being that to change into motor radially be the motion of normal direction for the motion of normal direction.This kind designs simplification motor with add connecting of mechanism, can reduce the cost of whole system.
Described some silicon steel sheets 20 reverse a slot-pitch angle clockwise when laminating, to reduce the torque pulsation that teeth groove causes.
Sulculus 18 that embeds jump ring of design is put into jump ring during assembling between armature spindle 2 and worm screw, prevents the axial endplay of rotor.
Described rotor magnetic steel 3 can be selected the radially excitatory annular magnetic steel of neodymium iron boron for use, and pole embrace is greater than 0.85.Annular magnetic steel adopts integrated four utmost point radial magnetizings, not only protects magnet, make its anti-degaussing, anti-vibrating and impact, and it is close to have strengthened motor gas-gap magnetic, effectively reduces motor volume.
The cooperation of rotor magnetic steel 3 and rotor yoke 17 is pasted glue by adopting high temperature resistance and high strength, selects 0～0.012 matched in clearance tolerance for use.Make between magnet steel and the rotor yoke too not closely, also too unloose, guaranteed that rotor magnetic steel 3 can firm being fixed on the rotor yoke 17 at a high speed and during run with load at motor, protects magnet steel 3 unlikely fractures simultaneously.
Motor bottom is selected oiliness bearing 16 for use, has promptly guaranteed the efficient operation of rotor, has guaranteed the seal of motor again.The motor end is selected high-precision bearing 23 for use, in order to improve the rotating speed smoothness.
Radial air gap 4 width between motor stator and the rotor are 0.8mm～1.2mm.
Rotor magnetic steel 3 thickness are 2.4mm～3.6mm, are that to constitute length be 52mm～58mm rotor magnetic steel for the annular magnetic steel of 26mm～29mm by two block lengths.
Diameter of stator bore is 33.6mm～36.4mm, and stator outer diameter is 58.6mm～62.4mm, and stator core length is 52mm～58mm.
End cap 7 inside are hollow-core construction, in order to alleviate body weight.
Beneficial effect
The invention has the beneficial effects as follows: the present invention makes noise of motor less than 40 decibels owing to adopt above-mentioned a series of technological means, and torque pulsation is little, and fail safe and efficient height are cheap.Than dentistry chair seat with single-phase asynchronous motor and have the brush direct current machine have obvious advantage.
Description of drawings
Fig. 1 is a rare earth permanent magnet brushless DC motor for dentistry chair seat structure longitudinal sectional drawing of the present invention
Fig. 2 is the motor rotor construction schematic diagram
Fig. 3 is the motor stator punching schematic diagram
Fig. 4 is the stator core end view
Fig. 5 is the rotor radial schematic diagram
Fig. 6 sensor construction schematic diagram
Fig. 7 transducer wiring schematic diagram
Fig. 8 is the end cover structure schematic diagram
Fig. 9 is the worm gear arrangement schematic diagram
1-casing, 2-rotating shaft, 3-rotor magnetic steel, 4-air gap, 5-stator core
6-sensor stand, 7-end cap, 8-transducer magnet steel, 9-jump ring
13-the plate of 10-transducer magnet steel support, 11-cross pan head screw, 12-packing ring
14-liner, 15-lining, 16-oiliness bearing, 17-rotor yoke, 18-jump ring groove
19-worm screw, 20-stator punching, 21-Hall element, 22-back-up ring
23-bearing, 24-bearing insert, 25-worm-wheel shaft, 26-worm gear
Embodiment
Now in conjunction with the accompanying drawings the present invention is further described:
The embodiment of the invention is a 55W/24V rare earth permanent magnet brushless DC dentistry chair seat motor.
The stator yoke height is 3.95mm, stator yoke length 55mm.
Motor stator is made of stator core and armature winding.Stator integral body embeds in casing 1 inside.Stator core 5 is overrided to form by number of metal silicon steel sheet 20, and silicon steel sheet reverses a slot-pitch angle clockwise when laminating, to reduce the torque pulsation that teeth groove causes.In the stator module, stator core 5 adopts the high-performance permeability magnetic material, and diameter of stator bore is 35mm, and stator outer diameter is 60mm, and stator core length is 55mm.Adopt to concentrate and put in order apart from winding, iron core 5 skewed slots distribute, and have reduced the fuselage size of motor, have reduced the torque pulsation that teeth groove causes.Stator core 5 is by dipping lacquer in insulating varnish, to improve insulation property.
In the rotor assembly, rotor magnetic steel 3 is spliced by two identical radially excitatory annular magnetic steels of neodymium iron boron (NdFeB) of performance, and pole embrace is greater than 0.85.Each magnet steel length is 27.5mm, and thickness 3mm is nested and be pasted on the rotor yoke 17, and whole magnet steel length is 55mm., can exert oneself etc. on the basis of performance not influencing motor as rotor magnetic steel 3 integral body with the splicing of two blocks of magnet steel, reduce the difficulty that magnetizes of magnet steel, effectively reduced the cost of motor.Annular magnetic steel adopts integrated four utmost point radial magnetizings, not only protects magnet, make its anti-degaussing, anti-vibrating and impact, and it is close to have strengthened motor gas-gap magnetic, effectively reduces motor volume.Rotor magnetic steel 3 has rust inhibition through electrophoretic process.The cooperation of rotor magnetic steel 3 and rotor yoke 17 is pasted by adopting high temperature resistance and high strength to paste glue (DG-3S); select 0～0.012 matched in clearance tolerance for use; make between magnet steel and the rotor yoke too not tight; also too unloose; guarantee rotor magnetic steel 3 firm being fixed on the rotor yoke 17 of energy when motor high speed and run with load, protected magnet steel 3 unlikely fractures simultaneously.
Radial air gap 4 between motor stator and the rotor is 0.4mm.
In the sensor cluster, transducer magnet steel 8 is an axial charging, and axial width is 3mm, stick on the transducer magnet steel support 10, and the design that is integrated of sensor stand 10 and rotor yoke 17, assurance is to the accurate induction of motor rotor position.Sensor circuit board is stuck between casing 1 and the end cap 7, and embeds the end cap 7 other notches that are provided with.
The front end of armature spindle 2 is a screw-rod structure 19, is meshed with worm gear 26 on the worm-wheel shaft 25.The worm structure of armature spindle 2 front ends, in conjunction with the worm gear on the end cap 7, can be with motor axially being that to change into motor radially be the motion of normal direction for the motion of normal direction.This kind designs simplification motor with add connecting of mechanism, can reduce the cost of whole system.
Motor bottom is selected oiliness bearing 16 for use, has promptly guaranteed the efficient operation of rotor, has guaranteed the seal of motor again.The end is selected high-precision bearing 23 for use, in order to improve the rotating speed smoothness.
End cap 7 is for boring designs, in order to alleviate body weight.
Present embodiment rotor magnet steel rated speed 3000RPM (rev/min), test noise only is 36 decibels.By transmission mechanism, thrust can reach 4000N, and operates steadily.
Claims (11)
1. rare earth permanent magnet brushless DC motor for dentistry chair seat, be included in stator, rotor, end cap and sensor cluster in the housing (1), it is characterized in that: the iron core of described stator (5) is overrided to form by number of metal silicon steel sheet (20), embeds in casing (1) inside; The magnet steel of described rotor (3) is spliced by two identical annular magnetic steels of performance, and is nested and be pasted on the rotor yoke (17); The magnet steel of described transducer (8) sticks on the transducer magnet steel support (10), and sensor stand (10) is fitted in the rotating shaft (2), with coaxial linking to each other of rotor yoke (17); Between housing (1) and the end cap (7) rubber insulator is arranged; The front end of armature spindle (2) is screw-rod structure (19), is meshed with worm gear (26) on the worm-wheel shaft (25).
2. a kind of rare earth permanent magnet brushless DC motor for dentistry chair seat according to claim 1 is characterized in that: described some silicon steel sheets (20) reverse a slot-pitch angle clockwise when laminating.
3. a kind of rare earth permanent magnet brushless DC motor for dentistry chair seat according to claim 3 is characterized in that: sulculus (18) that embeds jump ring of design between armature spindle (2) and worm screw.
4. a kind of rare earth permanent magnet brushless DC motor for dentistry chair seat according to claim 1 is characterized in that: described rotor magnetic steel (3) can be selected the radially excitatory annular magnetic steel of neodymium iron boron for use, and pole embrace is greater than 0.85.
5. a kind of rare earth permanent magnet brushless DC motor for dentistry chair seat according to claim 1 is characterized in that: the cooperation of rotor magnetic steel (3) and rotor yoke (17) is pasted glue by adopting high temperature resistance and high strength, selects 0～0.012 matched in clearance tolerance for use.
6. a kind of rare earth permanent magnet brushless DC motor for dentistry chair seat according to claim 1 is characterized in that: transducer magnet steel (8) is an axial charging, and magnet thickness is 1.2mm～2.8mm.
7. a kind of rare earth permanent magnet brushless DC motor for dentistry chair seat according to claim 1 is characterized in that: motor bottom is selected oiliness bearing (16) for use, and the motor end is selected high-precision bearing (23) for use.
8. a kind of rare earth permanent magnet brushless DC motor for dentistry chair seat according to claim 1 is characterized in that: the radial air gap between motor stator and the rotor (4) width is 0.8mm～1.2mm.
9. according to claim 1 or 4 described a kind of rare earth permanent magnet brushless DC motor for dentistry chair seat, it is characterized in that: rotor magnetic steel (3) thickness is 2.4mm～3.6mm, is that to constitute length be 52mm～58mm rotor magnetic steel for the annular magnetic steel of 26mm～29mm by two block lengths.
10. a kind of rare earth permanent magnet brushless DC motor for dentistry chair seat according to claim 1 is characterized in that: diameter of stator bore is 33.6mm～36.4mm, and stator outer diameter is 58.6mm～62.4mm, and stator core length is 52mm～58mm.
11. a kind of rare earth permanent magnet brushless DC motor for dentistry chair seat according to claim 1 is characterized in that: end cap (7) is inner to be hollow-core construction.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2004100734622A CN100405711C (en) | 2004-12-24 | 2004-12-24 | Rare earth permanent magnet brushless DC motor for dentistry chair seat |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2004100734622A CN100405711C (en) | 2004-12-24 | 2004-12-24 | Rare earth permanent magnet brushless DC motor for dentistry chair seat |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1797911A true CN1797911A (en) | 2006-07-05 |
| CN100405711C CN100405711C (en) | 2008-07-23 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2004100734622A Expired - Fee Related CN100405711C (en) | 2004-12-24 | 2004-12-24 | Rare earth permanent magnet brushless DC motor for dentistry chair seat |
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| Country | Link |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102255437A (en) * | 2011-07-07 | 2011-11-23 | 常州市昊升电机有限公司 | High-performance rare earth permanent magnet DC motor |
| CN106655606A (en) * | 2016-11-24 | 2017-05-10 | 兰州飞行控制有限责任公司 | Direct current brushless motor rotor structure |
| CN110214405A (en) * | 2017-01-24 | 2019-09-06 | Lg伊诺特有限公司 | Motor |
| CN114977554A (en) * | 2022-06-09 | 2022-08-30 | 湖州太平微特电机有限公司 | External rotor motor and manufacturing method |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2309663Y (en) * | 1997-09-18 | 1999-03-03 | 任玉发 | High-efficiency rare-earth permanent-magnetic brushless dc electric machine |
| CN2428911Y (en) * | 2000-06-12 | 2001-05-02 | 朱向东 | Long-service-life multi-model type permanent magnet brushless servo electric motor |
-
2004
- 2004-12-24 CN CNB2004100734622A patent/CN100405711C/en not_active Expired - Fee Related
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102255437A (en) * | 2011-07-07 | 2011-11-23 | 常州市昊升电机有限公司 | High-performance rare earth permanent magnet DC motor |
| CN102255437B (en) * | 2011-07-07 | 2013-08-07 | 常州市昊升电机有限公司 | High-performance rare earth permanent magnet DC motor |
| CN106655606A (en) * | 2016-11-24 | 2017-05-10 | 兰州飞行控制有限责任公司 | Direct current brushless motor rotor structure |
| CN110214405A (en) * | 2017-01-24 | 2019-09-06 | Lg伊诺特有限公司 | Motor |
| CN110214405B (en) * | 2017-01-24 | 2021-11-16 | Lg伊诺特有限公司 | Motor |
| US11670975B2 (en) | 2017-01-24 | 2023-06-06 | Lg Innotek Co., Ltd. | Motor having optimized gaps between magnets for improving cogging torque |
| CN114977554A (en) * | 2022-06-09 | 2022-08-30 | 湖州太平微特电机有限公司 | External rotor motor and manufacturing method |
Also Published As
| Publication number | Publication date |
|---|---|
| CN100405711C (en) | 2008-07-23 |
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Owner name: SHENZHEN HIGH SPEED ELECTRICAL MACHINERY CO., LTD. Free format text: FORMER OWNER: NORTHWESTERN POLYTECHNICAL UNIVERSITY Effective date: 20110927 |
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Free format text: CORRECT: ADDRESS; FROM: 710072 XI'AN, SHAANXI PROVINCE TO: 518109 SHENZHEN, GUANGDONG PROVINCE |
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| TR01 | Transfer of patent right |
Effective date of registration: 20110927 Address after: 518109 Guangdong province Shenzhen city Baoan District Road, Dalang street, Hua Fan anda science and Technology Industrial Park, building fifth, first floor Patentee after: SHENZHEN HIGHSPEED MOTOR CO., LTD. Address before: 710072 Xi'an friendship West Road, Shaanxi, No. 127 Patentee before: Northwestern Polytechnical University |
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| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20080723 Termination date: 20151224 |
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| EXPY | Termination of patent right or utility model |