CN1756042A - Light power three-phase motor - Google Patents
Light power three-phase motor Download PDFInfo
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- CN1756042A CN1756042A CN 200410051708 CN200410051708A CN1756042A CN 1756042 A CN1756042 A CN 1756042A CN 200410051708 CN200410051708 CN 200410051708 CN 200410051708 A CN200410051708 A CN 200410051708A CN 1756042 A CN1756042 A CN 1756042A
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Abstract
The invention relates to a low power three phase motor. Wherein, the stator has a star winding and a triangle winding; the phase bands of said two windings are alternatively distributed while the electrical angle distance of central space of nearby phase bands is pi/6; the invention is characterized in that: the stator has 4 electrodes and 24 grooves while it is consequent pole single-phase winding, the edge of star winding and the edge of triangle winding individually takes up 12 grooves while said two windings are alternatively distributed along the grooves; the number of turn of triangle winding is the 1.73 times of the number of turn of star winding while its wire diameter is the 0.76 times of the wire diameter of star winding; according to the phase sequence, the initial terminal of each phase of star winding is connected to the power source and every linear terminal of triangle winding is connected to the end terminal of relative phase of star winding or the initial terminal of each phase of star winding and every linear terminal of triangle winding are connected to the power source while the end terminals of each phase of star winding are connected each other. Compared to the present technique, the invention can improve the coefficient of winding and weaken higher harmonic to improve the property, reduce the cost, improve the start property and reduce the electromagnetic vibration noise.
Description
Technical field
The present invention relates to a kind of small-power threephase motor, in International Patent Classification (IPC), classification belongs to H02K3/28.
Background technology
For overcoming the disadvantage of the three-phase winding motor that traditional unique star or triangle connect, prior art has proposed to adopt the scheme of star and triangle mixed winding in threephase motor, to improving winding coefficient and eliminating high order harmonic component and obtain positive effect.As seen be published in " middle and small motor " article of 1978 the 5th phases " triangle of three phase windings-star series and parallel connection ".The star of prior art and triangle mixed winding are found in Chinese invention patent ublic specification of application CN1378325 " wiring method of multifunctional motor stator winding " and Chinese utility model patent specification CN2266220Y " pumping motor " etc.Situation and employing two layer winding that the wiring spininess of its winding is more to the groove number relatively are fit to more powerful middle-size and small-size motor, and for the less small power motor of diameter, it is difficult that technology then seems.Unique star or the Atria phase winding of the still more employing of small-power threephase motor that the groove number is less, thereby be higher than three times harmonic wave and fail effectively to eliminate, be difficult to further improve startability and reduce electromagnetic vibration noise; And winding coefficient is difficult to further raising, with the efficient of improving motor or reduce cost.
Summary of the invention
Technical problem to be solved by this invention is, a kind of small-power threephase motor is proposed, it designs a kind of star simple in structure and triangle mixed winding at 24 common groove stators of electric household utensil motor, to improve winding coefficient and to eliminate high order harmonic component.
The technical scheme that the present invention solve the technical problem is a kind of small-power threephase motor, comprises stator and rotor; Described stator is access to the star winding of power supply and the delta windings that triangular ground is access to power supply with having star; The two is alternately distributed the facies tract of described star winding and the facies tract of delta windings, and adjacent facies tract central space electrical degree is π/6 at interval; It is characterized in that:
---described stator is 4 utmost points, 24 grooves and multitudinous utmost point single layer winding, and the coil side of described star winding and the coil side of delta windings respectively account for 12 grooves, and the two is alternately distributed by groove;
---the number of turn of the coil side of described delta windings is 1.73 times of the number of turn on star winding coil limit, and line directly is 0.76 times of line footpath on described star winding coil limit;
---according to phase sequence, the top of described each phase of star winding connects power supply, and each line terminals of described delta windings is connected in the end of the corresponding phase of described star winding.
Another technical scheme that the present invention solve the technical problem is a kind of small-power threephase motor, comprises stator and rotor; Described stator is access to the star winding of power supply and the delta windings that triangular ground is access to power supply with having star; The two is alternately distributed the facies tract of described star winding and the facies tract of delta windings, and adjacent facies tract central space electrical degree is π/6 at interval; It is characterized in that:
---described stator is 4 utmost points, 24 grooves and multitudinous utmost point single layer winding, and the coil side of described star winding and the coil side of delta windings respectively account for 12 grooves, and the two is alternately distributed by groove;
---the number of turn of the coil side of described delta windings is 1.73 times of the number of turn on star winding coil limit, and line directly is 0.76 times of line footpath on described star winding coil limit;
---according to phase sequence, the top of described each phase of star winding and each line terminals of delta windings are connected power supply, and the end of each phase of star winding links together.
More than two technical scheme stator winding be star and triangle mixed winding, just the former is two part windings in series, the latter is two part winding parallel connections.
This two technical scheme dexterously at the stator of 4 utmost points, 24 grooves, has designed the star and the triangle mixed winding of multitudinous utmost point individual layer to the small-power threephase motor rightly, and its coil number is 12.The single layer winding that three-phase star that this coil number and coil dimension and prior art are single or triangle are connected is identical.About the design in the number of turn of star and triangle mixed winding two parts and line footpath, be that the ratio according to phase voltage in the three-phase system and line voltage makes this two part bear the consideration of impartial electromagnetic load.This number of turn and line directly differ greatly, and distinguish easily, and be very favourable to wire insertion technology.With respect to the unique star of traditional small-power threephase motor or 2 π/3 or π/3 facies tracts of Atria phase winding, it is not the very for a short time situation that is difficult to offer than multiple-grooved that this two technical schemes star and triangle mixed winding adapt to stator dimensions, be π/6 facies tracts, and every utmost point is mutually for concentrating winding, thereby improved winding coefficient, directly improve the efficient of motor or reduce cost.And, theory and practice shows, star and triangle mixed winding can be eliminated three phase windings more formidable 5 times, 7 times, 17 times and 19 subharmonic that unique star or triangle are connected fully in threephase motor, as seen be published in " middle and small motor " article of 1978 the 5th phases " triangle of three phase windings-star series and parallel connection ".For small power motor, on the basis of eliminating the serious triple-frequency harmonics of harm, further elimination of employing star and triangle mixed winding 5 times, 7 times, 17 times and 19 subharmonic are significant, can further improve startability and reduce electromagnetic vibration noise.
This two technical scheme further described rotor of design is a solid rotor, help eliminating the harmonic wave outside 3 times, 5 times, 7 times, 17 times and 19 times, further improve startability and reduce electromagnetic vibration noise, especially be fit to the operation characteristic of washing machine one class electric household utensil motor frequent starting.Solid rotor is lower than lamination cast-aluminum rotor cost, and technology is simple.Described solid rotor outer surface also can cover good conducting metal, to improve the operational efficiency of motor.
Technical solution of the present invention and modular design thereof will further specify in embodiment.
Description of drawings
The following drawings is used to illustrate the specific embodiment of the present invention.
Fig. 1 is the present invention's the 1st embodiment motor wiring schematic diagram;
Fig. 2 is the present invention's the 1st embodiment motor developed winding diagram.
Fig. 3 is the present invention's the 2nd embodiment motor wiring schematic diagram;
Fig. 4 is the present invention's the 2nd embodiment motor developed winding diagram.
Embodiment
The present invention's the 1st embodiment motor wiring as shown in Figure 1, winding distributes as shown in Figure 2.It is to meet on the basis of 24 groove stator cores, cage rotor and other mechanical mechanism of 4 utmost point 180W use in washing machine single-phase capacitor operation motors that national sector standard JB/T3758 requires prior art a kind of, and its stator winding rule again and wiring are formed:
As Fig. 1, this stator winding comprises star winding part of being made up of three phase winding Ay, By, Cy and the delta windings part of being made up of three phase winding Ao, Bo, Co.The top of Ay, By, Cy connects three phase mains terminal A, B, C respectively, and the top of Ao and the end of Co are connected in the end of Ay, and the top of Bo and the end of Ao are connected in the end of By, and the top of Co and the end of Bo are connected in the end of Cy.
This stator winding still remains 4 utmost points by developed winding diagram rule shown in Figure 2.Three phase winding Ay, By, Cy and three phase winding Ao, Bo, Co distribute by identical phase sequence difference interval 2 π successively/3 space electrical degrees with identical direction of rotation in stator as shown in Figure 1:
Ay organizes mutually by the multitudinous utmost point with another utmost point that the 14th and the 20th groove was organized and be embedded in to a utmost point of the 8th groove mutually and to be in series by being embedded in the 2nd, and top the 2nd groove is drawn and is access to lead-out wire A, terminally draws in the 20th groove;
By organizes mutually by the multitudinous utmost point with another utmost point that the 18th and the 24th groove was organized and be embedded in to a utmost point of the 12nd groove mutually and to be in series by being embedded in the 6th, and top is drawn in the 6th groove and is access to lead-out wire B, terminally draws in the 24th groove;
Cy organizes mutually by the multitudinous utmost point with another utmost point that the 22nd and the 4th groove was organized and be embedded in to a utmost point of the 16th groove mutually and to be in series by being embedded in the 10th, and top is drawn in the 10th groove and is access to lead-out wire C, terminally draws in the 4th groove;
Ao organizes mutually by the multitudinous utmost point with another utmost point that the 13rd and the 19th groove was organized and be embedded in to a utmost point of the 7th groove mutually and to be in series by being embedded in the 1st, and top is drawn and terminally drawn in the 19th groove in the 1st groove;
Bo organizes mutually by the multitudinous utmost point with another utmost point that the 17th and the 23rd groove was organized and be embedded in to a utmost point of the 11st groove mutually and to be in series by being embedded in the 5th, and top is drawn and terminally drawn in the 23rd groove in the 5th groove;
Co organizes mutually by the multitudinous utmost point with another utmost point that the 21st and the 3rd groove was organized and be embedded in to a utmost point of the 15th groove mutually and to be in series by being embedded in the 9th, and top is drawn and terminally drawn in the 3rd groove in the 9th groove.
As can be seen, the coil side of the coil side of star winding part and delta windings part respectively accounts for 12 grooves, and the two is alternately distributed by groove, and electrical degree is spaced apart 1 groove, i.e. π/6.For example the top of Ay is in the 2nd groove, and the top of Ao is in the 1st groove, and according to phase sequence A-B-C distribution arrangement, the former lags behind the latter's 1 groove, i.e. space electrical degree π/6.During symmetrical operation, the line current in the delta network lags behind corresponding line phase current π/6, and the electric current of circuit Ay promptly shown in Figure 1 lags behind electric current π/6 of Ao.According to similar analysis, other adjacent windings limit also is same situation.Because facies tract reduces, produced the better circular rotating field of three-phase winding motor than unique star or triangle connection.
Also can find out, this each utmost point of motor winding is organized the single coil into pitch 6 grooves mutually, be that range is concentrated winding, so winding coefficient is 1, the winding coefficient (0.96) that is higher than three phase windings of unique star or triangle connection, higher efficient can be arranged, maybe can shorten core length, to lower the electromagnetic material cost.
The magnetic potential that present embodiment design star winding partly produces equates with the magnetic potential that delta windings partly produces, and promptly the number of turn organized mutually of the utmost point of Ao, Bo, Co is respectively 1.73 times of the numbers of turn that the utmost point of Ay, By, Cy organizes mutually, and line directly is 0.76 times of the latter.Can make star winding part and delta windings part respectively bear half of supply voltage or electromagnetic load like this, thus two on visual same six phase motor or star and triangle independently threephase motor design.Referring to " middle-size and small-size threephase motor electromagnetic computation program " (the 1st Shanghai Electric Appliance Science Inst., Ministry of Machinery, Shanghai, 1971) and " miniature three-phase single-phase motor Electromagnetic Design Program " (Guangzhou Inst. of Electric Equipment Science, nineteen eighty-two).
The motor of this embodiment is an asynchronous motor.For reducing the cost, can replace the solid rotor of the cage rotor of original lamination cast aluminium with electrical pure iron or mild steel.Former rotor punching can be used as less motor punching.Solid rotor outer surface copper facing 0.05～0.15mm can improve the operational efficiency of motor, and be used for antirust.If further silver-plated 0.005～0.01mm, effect can be better.This rotor also can be used permanent magnet or hysteresis material instead, makes synchronous motor.
The present invention's the 2nd embodiment motor wiring as shown in Figure 3, winding distributes as shown in Figure 4.It only is that the star winding of stator winding and delta windings two parts are changed into and are parallel to power supply respectively by being access to power supply after connecting with the difference of the 1st embodiment motor.Promptly this stator winding is changed into three phase mains terminal A, being connected of B, C with the delta windings part of being made up of three phase winding Ao, Bo, Co by the star winding part that three phase winding Ay, By, Cy form:
---the top of Ay, By, Cy connects three phase mains terminal A, B, C respectively, and the end of Ay, By, Cy links together;
---the top of Ao and the end of Co are connected in power supply terminal A, and the top of Bo and the end of Ao are connected in power supply terminal B, and the top of Co and the end of Bo are connected in power supply terminal C.
The neutral point of star winding, promptly the end of Ay, By, Cy can be further used for connecting the neutral terminal of power supply.
Comparable the 2nd embodiment motor of the 1st embodiment more helps reducing high order harmonic component circulation, and the former is fit to lower-powered situation, and the end wiring is simpler.
The performance characteristics test shows of embodiment asynchronous motor, its no-load current reduces, and efficient improves, and can suitably shorten core length to reduce cost.Experiment shows that this motor is particularly useful for variable-frequency washing machine, can obviously alleviate power supply wave shape distortion influence of harmonic, further improves electromagnetic noise.
Claims (4)
1, a kind of small-power threephase motor comprises stator and rotor; Described stator is access to the star winding of power supply and the delta windings that triangular ground is access to power supply with having star; The two is alternately distributed the facies tract of described star winding and the facies tract of delta windings, and adjacent facies tract central space electrical degree is π/6 at interval; It is characterized in that:
---described stator is 4 utmost points, 24 grooves and multitudinous utmost point single layer winding, and the coil side of described star winding and the coil side of delta windings respectively account for 12 grooves, and the two is alternately distributed by groove;
---the number of turn of the coil side of described delta windings is 1.73 times of the number of turn on star winding coil limit, and line directly is 0.76 times of line footpath on described star winding coil limit;
---according to phase sequence, the top of described each phase of star winding connects power supply, and each line terminals of described delta windings is connected in the end of the corresponding phase of described star winding.
2, a kind of small-power threephase motor comprises stator and rotor; Described stator is access to the star winding of power supply and the delta windings that triangular ground is access to power supply with having star; The two is alternately distributed the facies tract of described star winding and the facies tract of delta windings, and adjacent facies tract central space electrical degree is π/6 at interval; It is characterized in that:
---described stator is 4 utmost points, 24 grooves and multitudinous utmost point single layer winding, and the coil side of described star winding and the coil side of delta windings respectively account for 12 grooves, and the two is alternately distributed by groove;
---the number of turn of the coil side of described delta windings is 1.73 times of the number of turn on star winding coil limit, and line directly is 0.76 times of line footpath on described star winding coil limit;
---according to phase sequence, the top of described each phase of star winding and each line terminals of delta windings are connected power supply, and the end of each phase of star winding links together.
3, according to claim 1 or the described small-power threephase motor of claim 2, it is characterized in that described rotor is a solid rotor.
According to the described small-power threephase motor of claim 3, it is characterized in that 4, described solid rotor outer surface covers good conducting metal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200410051708 CN1756042A (en) | 2004-09-28 | 2004-09-28 | Light power three-phase motor |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200410051708 CN1756042A (en) | 2004-09-28 | 2004-09-28 | Light power three-phase motor |
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| CN1756042A true CN1756042A (en) | 2006-04-05 |
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| CN 200410051708 Pending CN1756042A (en) | 2004-09-28 | 2004-09-28 | Light power three-phase motor |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP3661018A4 (en) * | 2017-12-27 | 2020-11-11 | Anhui Meizhi Precision Manufacturing Co., Ltd. | Permanent magnet motor and compressor |
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2004
- 2004-09-28 CN CN 200410051708 patent/CN1756042A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP3661018A4 (en) * | 2017-12-27 | 2020-11-11 | Anhui Meizhi Precision Manufacturing Co., Ltd. | Permanent magnet motor and compressor |
| US11496007B2 (en) | 2017-12-27 | 2022-11-08 | Anhui Meizhi Precision Manufacturing Co., Ltd. | Permanent magnet motor and compressor |
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