CN101976921B - Method for improving accuracy of minimum starting torque of single-phase motor - Google Patents
Method for improving accuracy of minimum starting torque of single-phase motor Download PDFInfo
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- CN101976921B CN101976921B CN 201010259284 CN201010259284A CN101976921B CN 101976921 B CN101976921 B CN 101976921B CN 201010259284 CN201010259284 CN 201010259284 CN 201010259284 A CN201010259284 A CN 201010259284A CN 101976921 B CN101976921 B CN 101976921B
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Abstract
The invention provides a method for improving the accuracy of the minimum starting torque of a single-phase motor, which relates to the technical field of motors and solves the technical problem of improving the accuracy of the minimum starting torque. The single-phase motor comprises a casing, a rotor and a centrifugal switch, wherein the rotor and the centrifugal switch are installed in the casing; the front end and the back end of the casing are respectively provided with an end cover; two ends of the rotating shaft of the rotor are respectively connected with the end covers at the front end and the back end of the casing through a bearing; a wavy elastic washer which is coaxial with the rotating shaft of the rotor is sleeved at the front end of the rotating shaft of the rotor; and the front end and the back end of the wavy elastic washer are respectively butted with the end cover at the front end of the casing and the rotating shaft of the rotor. The method is characterized by comprising the following steps: arranging a centrifugal bottom plate installing boss on the end cover at the back end of the casing; fixing a centrifugal bottom plate of the centrifugal switch on the centrifugal bottom plate installing boss; installing a centrifuge of the centrifugal switch on the rotating shaft of the rotor; and pressing and fixing the bearing at the back end of the rotating shaft of the rotor on the end cover at the back end of the casing by a pressing block. The method provided by the invention can improve the accuracy of the minimum starting torque of the single-phase motor.
Description
Technical field
The present invention relates to the technology of motor, particularly relate to a kind of technology that improves the method for accuracy of minimum starting torque of single-phase motor.
Background technology
The winding of monophase machine all is made of main winding and auxiliary winding, and main winding spatially becomes 90 electrical degrees relation with auxiliary winding, and string has a centrifugal switch between main winding and the auxiliary winding.When electric motor starting, pass through electric current in main winding and the auxiliary winding, wherein main winding current lags behind the auxiliary certain phase angle of winding current, thereby generation rotating torques, when the rotating speed of rotor reaches the 75%-80% of rated speed, after this centrifugal switch assists winding no longer charged disconnecting being electrically connected between main winding and the auxiliary winding under the centrifugal intertia force effect, and motor is kept on the go by main winding.
Because when the rotating speed of motor reaches the 75%-80% of rated speed, it is centrifugal switch action in the starting process, disconnect being electrically connected between main winding and the auxiliary winding, optimum speed scope when making the pull up torque of motor reach maximum, therefore whether the breaking speed of centrifugal switch is vital accurately, and the installation dimension precision of breaking speed of centrifugal switch and centrifugal switch is relevant, in order to guarantee that centrifugal switch disconnects in the optimum speed scope, the limit deviation of the installation dimension of centrifugal switch need to be controlled at ± 0.2mm, when the installation dimension precision of centrifugal switch exceeds the limit deviation of installation dimension, breaking speed of centrifugal switch will depart from the 75%-80% of rated speed, so that the minimum starting torque of motor is less than normal; Fig. 3 is the T-N(torque-speed relation of centrifugal switch installation dimension motor when bigger than normal) curve chart, Fig. 4 is the T-N(torque-speed relation of centrifugal switch installation dimension motor when less than normal) curve chart, Fig. 5 is the T-N(torque-speed relation of centrifugal switch installation dimension motor when normal) curve chart, Fig. 3, axis of ordinates T among Fig. 4 and Fig. 5 is torque axis, axis of abscissas n is speed shaft, mark L11 place among Fig. 3, mark L21 place among Fig. 4 and the mark L31 place among Fig. 5 are the centrifugal switch cut-off point, mark L12 place among Fig. 3, mark L22 place among Fig. 4 and the mark L32 place among Fig. 5 are the pull up torque point of motor, from Fig. 3, Fig. 4 can find out when the centrifugal switch installation dimension is bigger than normal or less than normal, breaking speed of centrifugal switch is on the low side or higher, the pull up torque point of motor is then less than normal, when the centrifugal switch installation dimension is more accurate as can be seen from Figure 5, breaking speed of centrifugal switch is in the optimum speed scope, and the pull up torque point of motor is just larger.
As shown in Figure 2, existing monophase machine all is provided with end cap 22 in the rear and front end of its casing 21, each connects the end cap 22 of casing 21 rear and front ends rotating shaft 24 two ends of rotor 23 through a bearing 25, rotating shaft 24 front end sleeves at rotor 23 are provided with the wave spring washer coaxial with it 26, and the rear and front end of this wave spring washer 26 props up respectively the rotating shaft 24 of end cap 22 and the rotor of casing front end; End cap 22 at the casing front end is provided with centrifugal base plate installation base, and the centrifugal base plate 27 of centrifugal switch is fixed on the centrifugal base plate installation base of front end housing 22, and the sedimentator 28 of centrifugal switch is installed in the rotating shaft 24 of rotor; Because centrifugal switch and wave spring washer are installed in the same end of motor, and the rotating shaft of rotor is under the elastic force effect of wave spring washer, can be close to towards the rear end of casing, so the length tolerance of casing (0～-0.25mm), tolerance between the two bearings shoulder at rotating shaft two ends (0～-0.25mm), front end housing seam end face to the dimensional tolerance of centrifugal base plate installation base (0～+ 0.13mm), the dimensional tolerance of end cap seam end face at the bottom of the bearing chamber chamber of roller end bearing (0～+ 0.13mm), these tolerances are the installation dimension of cumulative effect centrifugal switch together all, its accumulated value has reached ± 0.38 mm, limit deviation control range ± the 0.2mm that has exceeded the installation dimension of centrifugal switch, so that the minimum starting torque precision of existing monophase machine is lower, thereby affected the product percent of pass of monophase machine.
Summary of the invention
For the defective that exists in the above-mentioned prior art, technical problem to be solved by this invention provides a kind of method that improves accuracy of minimum starting torque of single-phase motor.
In order to solve the problems of the technologies described above, a kind of method that improves accuracy of minimum starting torque of single-phase motor provided by the present invention, described monophase machine comprises casing, and is installed on rotor, centrifugal switch in the casing;
The rear and front end of described casing respectively is provided with an end cap, each connects the end cap of casing rear and front end the rotating shaft two ends of described rotor through a bearing, and the rotating shaft front end sleeve at rotor is provided with the wave spring washer coaxial with it, and the rear and front end of this wave spring washer props up respectively the rotating shaft of end cap and the rotor of casing front end;
It is characterized in that: establish a centrifugal base plate installation base at the end cap of casing rear end, the centrifugal base plate of centrifugal switch is fixed on the centrifugal base plate installation base on the end cap of casing rear end, the sedimentator of centrifugal switch is installed in the rotating shaft of rotor; The bearing of the rotating shaft rear end of rotor is pressed abd fixed on the end cap of casing rear end with a compact heap.
The method of raising accuracy of minimum starting torque of single-phase motor provided by the invention, because centrifugal switch and wave spring washer lay respectively at the rotating shaft two ends of rotor, under the elastic force effect of wave spring washer, rotor can be close to towards the rear end of casing, because the bearing of rotating shaft rear end is fixed by compact heap, therefore affect the dimensional tolerance of the centrifugal base plate installation base of only having of centrifugal switch installation dimension precision at the bottom of the bearing chamber chamber of rotating shaft rear end end bearing, this tolerance is easy to just can be controlled at ± 0.065 mm, limit deviation control range ± 0.2mm much smaller than the centrifugal switch installation dimension, so that minimum starting torque precision of the present invention is higher, its product percent of pass is also higher.
Description of drawings
Fig. 1 is the structural representation that adopts after the monophase machine biopsy cavity marker devices of method of the embodiment of the invention;
Fig. 2 is the structural representation after the existing monophase machine biopsy cavity marker devices;
Fig. 3 is the T-N curve chart of centrifugal switch installation dimension motor when bigger than normal;
Fig. 4 is the T-N curve chart of centrifugal switch installation dimension motor when less than normal;
Fig. 5 is the T-N curve chart of centrifugal switch installation dimension motor when normal.
Embodiment
Below in conjunction with description of drawings embodiments of the invention are described in further detail, but the present embodiment is not limited to the present invention, every employing analog structure of the present invention and similar variation thereof all should be listed protection scope of the present invention in.
As shown in Figure 1, a kind of method that improves accuracy of minimum starting torque of single-phase motor that the embodiment of the invention provides, described monophase machine comprises casing 1, and is installed on rotor 3, centrifugal switch in the casing 1;
The rear and front end of described casing 1 respectively is provided with an end cap 2, each connects the end cap of casing rear and front end rotating shaft 4 two ends of described rotor 3 through a bearing 5, and rotating shaft 4 front end sleeves at rotor 3 are provided with the wave spring washer coaxial with it 6, and the rear and front end of this wave spring washer 6 props up respectively the rotating shaft 4 of end cap 2 and the rotor of casing 1 front end;
It is characterized in that: establish a centrifugal base plate installation base at the end cap 2 of casing 1 rear end, the centrifugal base plate 7 of centrifugal switch is fixed on the centrifugal base plate installation base on the end cap 2 of casing 1 rear end, the sedimentator 8 of centrifugal switch is installed in the rotating shaft 4 of rotor 3; Bearing 5 usefulness one compact heap 9 of the rotating shaft rear end of rotor 3 is pressed abd fixed on the end cap 2 of casing 1 rear end.
Claims (1)
1. method that improves accuracy of minimum starting torque of single-phase motor, described monophase machine comprises casing, and is installed on rotor, centrifugal switch in the casing;
The rear and front end of described casing respectively is provided with an end cap, each connects the end cap of casing rear and front end the rotating shaft two ends of described rotor through a bearing, and the rotating shaft front end sleeve at rotor is provided with the wave spring washer coaxial with it, and the rear and front end of this wave spring washer props up respectively the rotating shaft of end cap and the rotor of casing front end;
It is characterized in that: establish a centrifugal base plate installation base at the end cap of casing rear end, the centrifugal base plate of centrifugal switch is fixed on the centrifugal base plate installation base on the end cap of casing rear end, the sedimentator of centrifugal switch is installed in the rotating shaft of rotor; Be pressed abd fixed on the bearing of the rotating shaft rear end of rotor on the end cap of casing rear end with a compact heap;
The dimensional tolerance of centrifugal base plate installation base at the bottom of the bearing chamber chamber of rotating shaft rear end end bearing is controlled at ± 0.065 mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201010259284 CN101976921B (en) | 2010-08-23 | 2010-08-23 | Method for improving accuracy of minimum starting torque of single-phase motor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201010259284 CN101976921B (en) | 2010-08-23 | 2010-08-23 | Method for improving accuracy of minimum starting torque of single-phase motor |
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| Publication Number | Publication Date |
|---|---|
| CN101976921A CN101976921A (en) | 2011-02-16 |
| CN101976921B true CN101976921B (en) | 2013-04-10 |
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| CN 201010259284 Active CN101976921B (en) | 2010-08-23 | 2010-08-23 | Method for improving accuracy of minimum starting torque of single-phase motor |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JP2013215027A (en) * | 2012-03-31 | 2013-10-17 | Nippon Densan Corp | Motor |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN2376134Y (en) * | 1999-05-17 | 2000-04-26 | 孙学政 | Wide voltage high-torque capacitor asynchronous motor |
| KR100437058B1 (en) * | 2002-10-01 | 2004-06-23 | 엘지전자 주식회사 | Single phase motor |
| CN100452634C (en) * | 2005-11-11 | 2009-01-14 | 艾默生电气公司 | A soft starter for single-phase motor and single-phase motor with same |
| CN201054536Y (en) * | 2007-04-30 | 2008-04-30 | 徐荣祖 | Accumulator AC three-phase asynchronous electromotor |
| CN201282395Y (en) * | 2008-10-14 | 2009-07-29 | 林仕供 | Tri-contact centrifugal switch control circuit of single-phase machine |
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| CN101976921A (en) | 2011-02-16 |
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