CN1292528C - A refrigerating compressor - Google Patents
A refrigerating compressor Download PDFInfo
- Publication number
- CN1292528C CN1292528C CN 200410052016 CN200410052016A CN1292528C CN 1292528 C CN1292528 C CN 1292528C CN 200410052016 CN200410052016 CN 200410052016 CN 200410052016 A CN200410052016 A CN 200410052016A CN 1292528 C CN1292528 C CN 1292528C
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- motor
- rotor
- radial distance
- air gap
- magnetic pole
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Abstract
The present invention relates to a refrigeration compressor which is provided with a permanent-magnet brushless DC motor (7), and a compression pump (8) in transmission connection with a drive shaft (2) of a motor, wherein the motor and the compression pump are sealed in the same casing (11). The present invention is characterized in that the radial distance of the middle part of the radial edge of magnetic poles (5, 14) of each unit pole of a rotor of the motor is larger than that of the outer edge of both sides in the circumferential direction. The present invention can reduce electric current pulsation and reduce the fluctuation of the work force moment of the compressor; the present invention has the advantages of easy start and low oscillation noise.
Description
Technical field
The invention belongs to a kind of compressor that is used for refrigeration plants such as refrigerator, air-conditioning.
Background technology
Each unit utmost point magnetic pole outer rim radius of rotor of existing refrigeration compressor motor equates everywhere, being rotor equates with air gap radial distance between the stator, particularly concerning the groove motor is arranged, because stator winding is arranged in the groove of stator core, the stator inner loop face forms some inwardly protruded groove teeth, rotor is in rotary course, when every group of opposite polarity adjacent cells utmost point magnetic pole interface bit period skims over each groove tooth, because the change suddenly of teeth groove magnetic resistance, can cause the pulsation of operating current, thereby compressor operating moment is fluctuateed, produce vibration and noise, also can influence the startup of compressor sometimes.
Summary of the invention
The present invention is intended to overcome above-mentioned deficiency, provides a kind of torque fluctuations little, easily starting, the refrigerant compressor that vibrating noise is little.
The technical scheme that addresses the above problem is (referring to implementing illustration): the present invention is provided with brushless, permanently excited direct current motor (7), the compression pump (8) that is in transmission connection with motor drive shaft (2), motor and compression pump are sealed in the same housing (11), each unit utmost point magnetic pole of the rotor of described motor is by being contained in outside the rotor core (4), and the tile-shaped magnet steel (5) that fixedly is connected as a single entity with rotor core (4) is formed, the tile-shaped magnet steel magnetizing direction is radial oriented, it is characterized in that: each unit utmost point magnetic pole (5 of the rotor of described motor, 14) radial distance at radially outer edge middle part is greater than the radial distance of circumferential both sides outer rim, and described watt of shape rotor magnetic steel (5) be outer to be surrounded by the stainless steel sleeve (6) that itself and rotor core (4) is fixed in one.
Each unit utmost point magnetic pole (5 of the present invention, 14) air gap between radially outer edge both sides and stator is greater than the air gap at middle part, and both sides are positions that adjacent pole has a common boundary, the increasing of this position air gap can make its changes of magnetic field gradient to the stator slot tooth reduce, thereby can reduce the pulsation of electric current, the work torque fluctuations of compressor is reduced, be easier to start, and reduce vibrating noise, also can play the effect of improving its startability for slotless electric machines.
Description of drawings
Fig. 1, the embodiment of the invention 1 overall structure schematic diagram
The cross-sectional view of the no pole shoe brushless, permanently excited direct current motor 7 that Fig. 2, embodiment 1 adopt
Fig. 3, Fig. 2 rotor magnetic pole part structure for amplifying schematic diagram
Fig. 4, embodiment 2 adopts pole shoe brushless, permanently excited direct current motor cross-sectional view
Fig. 5, rotor magnetic pole part structure for amplifying schematic diagram embodiment illustrated in fig. 4
1-stator winding 2-driving shaft 3-stator core 4-rotor core 5-rotor magnetic steel
6-stainless steel sleeve 7-motor 8-compression pump 9-reservoir 10-termination rack
11-housing 12-groove tooth 13-air gap 14-pole shoe 15-tangential magnet-steel
Embodiment
This example is for being used for the refrigerant compressor of air conditioner, and what compression pump 8 adopted is the rotation compression pump, is in transmission connection with motor 7, and the reservoir 9 of band suction pipe is communicated with compression pump, and rotation compression pump and motor 7 are sealed in the housing 11 of band discharge pipe jointly.
The permanent magnet brushless electromotor that is adopted comprises driving shaft 2, be fixed on the rotor core 4 on the driving shaft, be contained in rotor core outer watt shape rotor magnetic steel 5, stator core 3, be embedded in the threephase stator winding 1 in the stator core slot, leave air gap 13 between stator and the rotor, watt shape rotor magnetic steel 5 is outer to be surrounded by the stainless steel sleeve 6 that itself and rotor core 4 is fixed in one, it is radial oriented anisotropic ferrite permanent-magnet or Nd-Fe-B permanent magnetic that watt shape rotor magnetic steel adopts magnetizing direction, and three-phase stator winding links to each other with the DC frequency-changing circuit.
This routine unit utmost point magnetic pole is made up of the tile-shaped magnet steel 5 that fixedly is connected as a single entity with rotor core 4, be arranged with six watts of shape rotor magnetic steels on the rotor magnetic steel, form six unit utmost point magnetic poles, the radial distance at each unit utmost point magnetic pole outer rim middle part is all greater than the radial distance of circumferential both sides.
Referring to Fig. 3, (6-pole motor) unit utmost point magnetic pole cross section radially outer edge is to be arc H and the identical smooth curve that connects to form of monosymmetric arc H1, H2 of R by the middle part radius, the radial distance R1 of curve two-end-point, R2 value be less than the radial distance R of centre arc, thereby make air gap 13 between utmost point magnetic pole radial outer rim middle part, unit and the stator less than the air gap of both sides.
This structure is equally applicable to the brushless, permanently excited direct current motor of 2 utmost points, 4 utmost points, 8 utmost points
The foregoing description unit utmost point magnetic pole cross section outer marginal circumference is that symmetry is dwindled to the radial distance of both sides, concerning two-way electric rotating machine, rotating all can play reduce torque fluctuations, improve startability effect.
Unit utmost point magnetic pole cross section outer marginal circumference can asymmetricly be provided with to both sides concerning unidirectional electric rotating machine, radial distance facing to direction of rotation one side can be greater than the radial distance of opposite side, promptly facing to the air gap of the direction of rotation one side air gap less than opposite side, the air gap at outer rim middle part is then less than the air gap of both sides.
During design cell utmost point magnetic pole cross section outer rim curve, can design according to power of electric motor, generally speaking, power of motor is more little, the ratio of unit rotor magnetic pole outer rim centre radial distance and circumferential both sides outer rim radial distance just should be big more, promptly the air gap of both sides should be more greater than the air gap in centre.
Claims (3)
1, a kind of refrigerant compressor, be provided with brushless, permanently excited direct current motor (7), the compression pump (8) that is in transmission connection with motor drive shaft (2), motor and compression pump are sealed in the same housing (11), each unit utmost point magnetic pole of the rotor of described motor is by being contained in outside the rotor core (4), and the tile-shaped magnet steel (5) that fixedly is connected as a single entity with rotor core (4) is formed, the tile-shaped magnet steel magnetizing direction is radial oriented, it is characterized in that: the radial distance at utmost point magnetic pole radial outer rim middle part, each unit of the rotor of described motor is greater than the radial distance of circumferential both sides outer rim, and described watt of shape rotor magnetic steel (5) be outer to be surrounded by the stainless steel sleeve (6) that itself and rotor core (4) is fixed in one.
2, refrigerant compressor according to claim 1 is characterized in that: described unit utmost point magnetic pole cross section outer marginal circumference dwindles to the radial distance symmetry of both sides.
3, refrigerant compressor according to claim 1, it is characterized in that: described unit utmost point magnetic pole cross section outer rim faces toward the radial distance of the radial distance of direction of rotation one side greater than opposite side, promptly facing to the air gap of the direction of rotation one side air gap less than opposite side, the air gap at outer rim middle part is then less than the air gap of both sides.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200410052016 CN1292528C (en) | 2004-11-02 | 2004-11-02 | A refrigerating compressor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200410052016 CN1292528C (en) | 2004-11-02 | 2004-11-02 | A refrigerating compressor |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1633011A CN1633011A (en) | 2005-06-29 |
| CN1292528C true CN1292528C (en) | 2006-12-27 |
Family
ID=34846098
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200410052016 Expired - Fee Related CN1292528C (en) | 2004-11-02 | 2004-11-02 | A refrigerating compressor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1292528C (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102510143A (en) * | 2011-11-10 | 2012-06-20 | 田植华 | Permanent-magnet motor or permanent-magnet generator |
| BE1024712B1 (en) * | 2016-11-03 | 2018-06-07 | Atlas Copco Airpower Nv | Drive for a compressor element and water-injected compressor device equipped with it |
-
2004
- 2004-11-02 CN CN 200410052016 patent/CN1292528C/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| CN1633011A (en) | 2005-06-29 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20061227 Termination date: 20111102 |