CN203278445U - Brushless direct-current motor for small-sized rotor-type refrigeration compressor - Google Patents
Brushless direct-current motor for small-sized rotor-type refrigeration compressor Download PDFInfo
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- CN203278445U CN203278445U CN 201320292090 CN201320292090U CN203278445U CN 203278445 U CN203278445 U CN 203278445U CN 201320292090 CN201320292090 CN 201320292090 CN 201320292090 U CN201320292090 U CN 201320292090U CN 203278445 U CN203278445 U CN 203278445U
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Abstract
The utility model provides a brushless direct-current motor for a small-sized rotor-type refrigeration compressor. The inner diameter of the compressor cylinder is less than 51mm. The motor comprises a stator and a rotor. The stator comprises a stator core and a winding. The rotor comprises a rotor core and magnetic steels. The inner periphery of the rotor core is uniformly provided with a plurality of installation grooves for placing the magnetic steels. The plurality of installation grooves form a polygonal structure which takes the center of the rotor as the center. The magnetic steels are sintered neodymium-iron-boron magnetic steels and installed inside the installation groove in a plug-in manner. The motor provided by the utility model is high in electric efficiency, high in the highest operation rotating speed, small in torque pulsation, and good in manufacturability and security.
Description
[technical field]
The utility model relates to the mini-refrigerator system compressor, specially refers to a kind of small rotor-type refrigerant compressor brushless DC motor.
[background technology]
Existing refrigerating capacity scope is that 100～500W, compressor cylindrical shell internal diameter are less than the small rotor-type refrigerant compressor (referring to accompanying drawing 1) of 51mm, adopt the ring-type bonding magnetic steel at the brshless DC motor (referring to accompanying drawing 2) of the outer surface of rotor core, have following problem:
1) adopt annular surface bonded neodymium-iron-boron permanent magnet magnet steel (3), because bonded neodymium-iron-boron is lower than the maximum magnetic energy product of sintered NdFeB, so electric efficiency is on the low side, the salient pole of motor is 1 than (Lq/Ld), can not utilize reluctance torque to improve running speed.
2) gap because of ring-type magnet steel (3) inner surface and the stickup of rotor core (4) outer surface causes that shape position error and ring-type magnet steel outer surface are difficult to processing, adhesive permanent magnetism body magnet steel deviation causes the jerk value of whole outer circle of motor rotor large greatly, make in the compressor assembling process, motor stator and rotor gap is bad, the rate that rolls off the production line is high, and failure rate is high.
3) because of the bonded neodymium-iron-boron magnetic energy product lower than sintered NdFeB, in order to obtain identical electric efficiency and torque, the whole outside diameter of rotor has to increase, and make motor stator yoke section little, winding distance of round outside stator is little, easy damaged motor winding enamelled wire when making compressor loop burn-on outer cover (6), poor stability.
In view of above technical problem, development efficiency is high, good manufacturability, motor that fail safe is good become extremely important.
[utility model content]
A kind of small rotor-type refrigerant compressor brushless DC motor of the utility model design, electric efficiency is high, the highest running speed is high, torque pulsation is little, manufacturability and fail safe good.
For achieving the above object, the utility model adopts following technological means:
A kind of small rotor-type refrigerant compressor brushless DC motor, described compressor cylindrical shell internal diameter is less than 51mm, described motor comprises stator and rotor, described stator comprises stator core and winding, described rotor comprises rotor core and magnet steel, the interior week of described rotor core evenly is provided with the mounting groove of a plurality of placement magnet steel, and described magnet steel is the sintered NdFeB magnet steel.
As preferred embodiment of the present utility model, described mounting groove forms the polygonized structure centered by the rotor center of circle.
As preferred embodiment of the present utility model, satisfy D1/D2=1.6～1.65 between described stator outer diameter D1 and rotor outer circle diameter D2.
As preferred embodiment of the present utility model, satisfy D1/D3=1.2～1.25 between the bottom land circular diameter D3 of described stator outer diameter D1 and stator.
As preferred embodiment of the present utility model, the mounting groove of placing described magnet steel is apart from satisfying A/D2=0.36～0.39 between the minimum distance A in the rotor center of circle and rotor outer circle diameter D2.
As preferred embodiment of the present utility model, satisfy W/D2=π * (0.60～0.65)/2P, H/D2=0.06～0.08 between the width W of described magnet steel, rotor outer circle diameter D2, magnet steel number of poles 2P and magnet thickness H.
As preferred embodiment of the present utility model, described magnet steel forms the hexagon centered by the rotor center of circle.
compared with prior art, the utility model has the following advantages at least: the utility model is at the mounting groove of placing magnet steel that arranges in interior week of rotor core, described mounting groove forms the polygonized structure centered by the rotor center of circle, described sintered NdFeB magnet steel is arranged in the mounting groove of magnet steel in the way to insert, like this, the stator of available high-speed punching explained hereafter brshless DC motor, rotor core, and available machining mode reduces the beating degree of rotor outer circle, so the machining accuracy of rotor outer circle is high, solved to adopt in bonding ring-type magnet steel and pasted the gap with the rotor core outer surface and cause that size shape position error and ring-type magnet steel outer surface surface are difficult to process and cause the large problem of the jerk value of whole outer circle of motor rotor, make in the compressor assembling process, guarantee that more easily motor is fixed, rotor clearance, the rate of rolling off the production line and failure rate have been reduced.Make the stator and rotor gap fraction defective decline 20% in the compressor assembling process.
in addition, the utility model is by the stator outside diameter D1 to motor, rotor outer circle diameter D2, the bottom land circular diameter D3 of stator, the mounting groove of magnet steel is apart from the minimum distance A in the rotor center of circle, the width W of magnet steel, rotor outer circle diameter D2, the appropriate design of magnet steel number of poles 2P and magnet thickness H is to guarantee that the sintered NdFeB magnet steel can be inserted in (prior art employing bonded neodymium-iron-boron magnet steel in the mounting groove of compressor cylindrical shell internal diameter less than a plurality of placement magnet steel that in the rotor of the motor of 51mm, week evenly arranges, if adopt the sintered NdFeB magnet steel, how to be arranged in the rotor of internal diameter less than the motor of 51mm).Compare with the motor of prior art, the utility model structure has improved electric efficiency and the highest running rotating speed, and has reduced torque pulsation; When the assembling compressor, more easily guarantee the air gap between motor stator and rotor, stator and rotor clearance fraction defective in the compressor assembling process are descended, improved manufacturability; Motor stator yoke section is increased, strengthened the distance in the outer garden of winding and stator, avoided damaging when the upper outer cover of boxing compressor because of near distance the phenomenon of motor enamel-covered wire, improved fail safe and the manufacturability of compressor.
[description of drawings]
Fig. 1 is existing small rotor-type refrigerant compressor compressor arrangement figure.
Fig. 2 is the brushless DC motor structure of prior art.
Fig. 3 is the brushless DC motor structure of this patent.
In figure: (1)-stator (1-1)-stator core; (1-2) winding
(2)-rotor (2-1)-rotor core (2-2) magnet steel.
[embodiment]
It is that 100～500W, compressor cylindrical shell internal diameter are wide less than high efficiency, the range of speeds of the small rotor-type refrigerant compressor of 51mm, the brshless DC motor of good manufacturability that the utility model provides a kind of refrigerating capacity scope that is adapted to, to overcome the deficiencies in the prior art.
The brushless DC motor structure (referring to accompanying drawing 3) of the employing interpolation type sintered NdFeB magnet steel that the utility model provides, improved electric efficiency and salient pole than (Lq/Ld), improved the highest running speed, manufacturability and fail safe.
Compressor cylindrical shell internal diameter adopts brshless DC motor to comprise less than the small rotor-type refrigerant compressor of 51mm: the motor stator 1 of stator core 1-1 and the concentrated winding 1-2 composition that is wrapped in the enamelled wire formation in stator core; Rotor 2 comprises rotor core 2-1, is provided with in rotor core 2-1 every magnetic bridge and the mounting groove of putting magnet steel, inserts burn-back Nd-Fe-B permanent magnet magnet steel 2-2 in described mounting groove, has air gap between described stator and rotor.Described mounting groove evenly is arranged on week in rotor core, and described mounting groove forms the polygonized structure centered by the rotor center of circle, for example, and hexagon.
When the D3 of the bottom land circular diameter of stator 1 outside diameter D1, rotor 2 outside diameter D2, stator 1 has D1/D2=1.6～1.65; During the relational expression of D1/D3=1.2～1.25, the air-gap field density of motor is high, has improved electric efficiency 5%; Also make motor stator yoke section apart from increasing 80%, thereby strengthened the distance of winding and stator cylindrical, avoided damaging during outer cover on the boxing compressor because of near distance the phenomenon of motor enamel-covered wire.Because of D1/D2 when too small, can make stator be difficult to install winding and stator yoke section size reduction, make the magnetic field saturation improve, and reduce electric efficiency and power output, torque pulsation strengthens; If but D1/D2 is too small, can insert permanent magnet very little in rotor, the air-gap flux of the motor of generation also can make electric efficiency reduce very little.When D1/D3 is excessive, can make copper factor increase, coiling brings adverse effect to stator winding, and the output torque of motor is descended, and electric efficiency descends; If but D1/D3 can make again the motor magnetic saturation improve when too small, reduces electric efficiency, has reduced simultaneously the distance of winding and stator cylindrical, easy damaged motor enamel-covered wire when making on the boxing compressor outer cover.When D1/D2=1.6～1.65; Two aspects of good manufacturability of outer cover (6) on the high and boxing compressor of electric efficiency can be taken into account in D1/D3=1.2～1.25 o'clock.
When being used for placing the mounting groove of permanent magnetic steel 2-2 apart from the minimum distance size A in the rotor center of circle, and have the relational expression of A/D2=0.36～0.39 and permanent magnet magnet steel 2-2 thickness H, magnet steel width W between rotor 2 outside diameter D2, when having the relational expression of W/D2=π * (0.60～0.65)/2P, H/D2=0.06～0.08 between rotor 2 outside diameter D2 and magnet steel number of poles 2P, the motor gas-gap magnetic density is high, the salient pole of motor is than (Lq/Ld) height, anti-demagnetization capability is strong, the performance of motor is best, and reliability is high; Though less because of the permanent magnet consumption, can produce larger air-gap flux, so the motor cost is also lower.If A/D2 is too little, the permanent magnet magnet steel is too near to rotor center, and pole shoe is oversize, and the motor gas-gap magnetic flux density is low, affects electric efficiency; If too large, magnet steel and magnet isolation tank be bad layout all, and magnetic leakage factor is large, also affect electric efficiency, and motor torque ripple is large.W/D2 is larger, permanent magnet provides the sectional area of magnetic flux to increase, air gap flux density increases, and iron loss is increased, but because of electric loading decline, copper loss descends, overall electric efficiency rises, and motor cost and torque pulsation are risen, but the permanent magnet width is increased to a certain degree, the trend that electric efficiency increases is slowing down, and has best W/D2 ratio.Increase with H/D2 has improved operating point of the permanent magnet, and anti-demagnetization capability strengthens, and air gap flux density increases, and salient pole increases than (Lq/Ld), and electric efficiency increases, but motor cost and torque pulsation rising are risen; But H/D2 is increased to a certain degree, and the trend that efficient increases is slowing down, and has best H/D2 ratio.The efficient of motor is high when having the relational expression of A/D2=0.36～0.39, W/D2=π * (0.60～0.65)/2P, H/D2=0.06～0.08, the salient pole of motor is than (Lq/Ld) height, can utilize reluctance torque to improve the highest running rotating speed 15%, the little and good manufacturability of the torque pulsation of motor.
the utility model adopts interpolation type sintered NdFeB magnet steel, therefore, the stator of available high-speed punching explained hereafter brshless DC motor, rotor core, and available machining mode reduces the beating degree of rotor outer circle, so the machining accuracy of rotor outer circle is high, solved to adopt in bonding ring-type magnet steel and pasted the gap with the rotor core outer surface and cause that size shape position error and ring-type magnet steel outer surface surface are difficult to process and cause the large problem of the jerk value of whole outer circle of motor rotor, make in the compressor assembling process, guarantee that more easily motor is fixed, rotor clearance, the rate of rolling off the production line and failure rate have been reduced.Make the stator and rotor gap fraction defective decline 20% in the compressor assembling process.
The mounting groove that the rotor core 2-1 of brushless DC motor 2 places magnet steel 2-2 is 6, also can be made as required 4 or 8.
The utility model motor has improved electric efficiency and the highest running rotating speed; Reduced the stator and rotor gaps fraction defective in the compressor assembling process; Be more conducive to the boxing technique of outer cover on compressor, improved fail safe.
Compared with prior art, the utility model has the following advantages at least:
1) adopt D1/D2=1.6～1.65; D1/D3=1.2～1.25; A/D2=0.36～0.39; W/D2=π * (0.60～0.65)/2P; Behind H/D2=0.06～0.08, make to be adapted to compressor cylindrical shell internal diameter and can to adopt less than the brshless DC motor of 51mm and will insert the rotor structure of rotor core in the sintered NdFeB magnet steel.
2) to compare motor volume constant with the motor of prior art, and brshless DC motor of the present utility model because of the increase of air-gap flux, under the identical output torque of motor, descends current of electric, so electric efficiency improves; Salient pole because of motor increases than (Lq/Ld) in addition, can utilize reluctance torque to improve the highest running speed of motor.
3) outer circle of motor rotor of employing interpolation type magnet structure of the present utility model can carry out machining the rotor outer circle jerk value is reduced,, solved to adopt in bonding ring-type magnet steel and pasted the gap with the rotor core outer surface and cause that size shape position error and ring-type magnet steel outer surface are difficult to process and cause the large problem of the jerk value of whole outer circle of motor rotor.More easily guarantee the air gap between motor stator and rotor when the assembling compressor, manufacturability is improved, make the stator and rotor gap fraction defective decline in the compressor assembling process.
4) because adopting the interpolation type magnet structure, because of the high energy product of sintered NdFeB magnet steel, and adopt rational size relationship, make the rotor of the less external diameter of employing become possibility; Motor stator yoke section size is increased, strengthened the distance in the outer garden of winding and stator, avoided damaging the phenomenon of motor enamel-covered wire during outer cover because of near distance on the boxing compressor, be more conducive to outer cover on the boxing compressor, improved manufacturability.
Claims (7)
1. small rotor-type refrigerant compressor brushless DC motor, it is characterized in that: described compressor cylindrical shell internal diameter is less than 51mm, described motor comprises stator (1) and rotor (2), described stator comprises stator core (1-1) and winding (1-2), described rotor comprises rotor core (2-1) and magnet steel (2-2), the interior week of described rotor core (2-1) evenly is provided with the mounting groove of a plurality of placement magnet steel (2-2), and described magnet steel is the sintered NdFeB magnet steel.
2. a kind of small rotor-type refrigerant compressor brushless DC motor as claimed in claim 1 is characterized in that: described mounting groove forms the polygonized structure centered by the rotor center of circle.
3. a kind of small rotor-type refrigerant compressor brushless DC motor as claimed in claim 1, is characterized in that: satisfy D1/D2=1.6～1.65 between described stator outer diameter D1 and rotor outer circle diameter D2.
4. a kind of small rotor-type refrigerant compressor brushless DC motor as claimed in claim 1, is characterized in that: satisfy D1/D3=1.2～1.25 between the bottom land circular diameter D3 of described stator outer diameter D1 and stator.
5. a kind of small rotor-type refrigerant compressor brushless DC motor as claimed in claim 1 is characterized in that: the mounting groove of placing described magnet steel is apart from satisfying A/D2=0.36～0.39 between the minimum distance A in the rotor center of circle and rotor outer circle diameter D2.
6. a kind of small rotor-type refrigerant compressor brushless DC motor as claimed in claim 1, is characterized in that: satisfy W/D2=π * (0.60～0.65)/2P, H/D2=0.06～0.08 between the width W of described magnet steel, rotor outer circle diameter D2, magnet steel number of poles 2P and magnet thickness H.
7. a kind of small rotor-type refrigerant compressor brushless DC motor as described in any one in claim 1 to 6 is characterized in that: described magnet steel forms the hexagon centered by the rotor center of circle.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320292090 CN203278445U (en) | 2013-05-24 | 2013-05-24 | Brushless direct-current motor for small-sized rotor-type refrigeration compressor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320292090 CN203278445U (en) | 2013-05-24 | 2013-05-24 | Brushless direct-current motor for small-sized rotor-type refrigeration compressor |
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| Publication Number | Publication Date |
|---|---|
| CN203278445U true CN203278445U (en) | 2013-11-06 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201320292090 Expired - Lifetime CN203278445U (en) | 2013-05-24 | 2013-05-24 | Brushless direct-current motor for small-sized rotor-type refrigeration compressor |
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| CN (1) | CN203278445U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108028563A (en) * | 2015-09-30 | 2018-05-11 | 三菱电机株式会社 | Motor with permanent magnet |
-
2013
- 2013-05-24 CN CN 201320292090 patent/CN203278445U/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108028563A (en) * | 2015-09-30 | 2018-05-11 | 三菱电机株式会社 | Motor with permanent magnet |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term |
Granted publication date: 20131106 |
|
| CX01 | Expiry of patent term |