CN103501095B - A kind of small permanent magnetic sychronous motor and draining pump using " U " font iron core - Google Patents

A kind of small permanent magnetic sychronous motor and draining pump using " U " font iron core Download PDF

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Publication number
CN103501095B
CN103501095B CN201310462837.3A CN201310462837A CN103501095B CN 103501095 B CN103501095 B CN 103501095B CN 201310462837 A CN201310462837 A CN 201310462837A CN 103501095 B CN103501095 B CN 103501095B
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pole
font
pole shoe
motor
rotor
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CN103501095A (en
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区长钊
石胜美
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Hanyu Group JSCL
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Jangmen Idear Hanyu Electrical Joint Stock Co ltd
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Abstract

A kind of small permanent magnetic sychronous motor and draining pump using " U " font iron core, described motor comprises: p-m rotor, for radial the two poles of the earth magnetize cylindrical; Stator, the stator winding that the stator core comprising " U " font passes through with this iron core; Stator core comprises the pole body of pure " U " font and the pole-face of curvature and the shaping of this " U " font two arm top leans on the right pole shoe on the right side of the described p-m rotor face of cylinder by the left pole shoe on the left of the p-m rotor face of cylinder and pole-face, it is characterized in that, two pole tip place planes of at least one pole shoe are crossing with the symmetry axis of described " U " font.Described draining pump comprises the impeller of described motor and coaxial transmission thereof, and wound impeller plays the pump cover of volute effect, the pump housing of supporting motor and pump cover.Even if described motor and draining pump do not adopt non-homogeneous air gap, also can realize self-starting, magnetic resistance and torque ripple problem that non-homogeneous air gap causes can be eliminated, and improve the stability of structure and size.

Description

A kind of small permanent magnetic sychronous motor and draining pump using " U " font iron core
Technical field
The present invention relates to a kind of small permanent magnetic sychronous motor and the draining pump that use " U " font iron core, particularly relate to the magnetic structure of this motor, in International Patent Classification (IPC), classification can belong to H02K21/12 and F04D13/06.
Background technology
Use the small permanent magnetic sychronous motor of " U " font (also claim " U-shaped ", " U-shaped " or " tuning fork shape ") iron core to belong to salient-pole motor, structure is simple, especially efficiency of assembling and core stamping utilance very high.Its prior art is shown in following data:
China Machine Press's version " small-power permanent magnet motor principle, design and application " in 2009;
China Electric Power Publishing House's version " magneto " in 2007;
Harbin Institute of Technology pays quick 2005 Ph.D. Dissertation's " mechanism of U-shaped iron core single-phase self-starting permanent magnet synchronous motor and specificity analysis ";
University Of Qingdao Lin Jiang builds master thesis " single-phase self-starting permanent magnet synchronous motor emi analysis " in 2009;
Publication number is the application for a patent for invention Publication Specification of CN101854105A.
From above data, if the even air gap that between these motor stator and rotor, motor is conventional namely can not self-starting, thus traditional design is stepped air gap etc., non-energized and without when significantly rotating retardance, namely the field axis of p-m rotor naturally deflects to the little namely direction that magnetic resistance is little of air gap and leaves stator excitation magnetic field axis one angle, is called and starts angle.After energising, the excitation field of stator, to the alignment effect at this startup angle, rotor field, produces detent torque to rotor.But while non-homogeneous air gap provides detent torque, also reduce operational effect, mainly the increase section magnetic resistance of air gap increases, and the inevitable association of non-homogeneous air gap runs torque ripple, therefore increases vibration & noise.
The draining pump of this motor driven of prior art, is found in the Chinese patent application that the applicant's publication number is CN202954990U, CN202954989U, CN202602396U, CN202550703U, CN102182711A, CN102223011A and CN102094832A.This draining pump is widely used in the household electrical appliance such as washing machine and dishwasher, and the raising of its performance also needs the improvement of problem of described motor.
The visible China Standards Press of relational term versions " electrotechnical, electronic standard terminology dictionary " in 1992 or above-mentioned data.
Summary of the invention
Technical problem to be solved by this invention is, a kind of small permanent magnetic sychronous motor using " U " font iron core is proposed, its magnetic air gap structure can make the draining pump of this motor and this motor driven have preferably startability and operational effect compared to existing technology
Technical solution problem the 1st technical scheme of the present invention is: a kind of small permanent magnetic sychronous motor using " U " font iron core, comprising:
---p-m rotor, for radial the two poles of the earth magnetize cylindrical;
---stator, the stator winding that the stator core comprising " U " font passes through with this iron core;
---described stator core comprises the pole body of pure " U " font and the pole-face of curvature and the shaping of this " U " font two arm top leans on the right pole shoe on the right side of the described p-m rotor face of cylinder by the left pole shoe on the left of the described p-m rotor face of cylinder and pole-face, it is characterized in that, two pole tip place planes of at least one pole shoe are crossing with the symmetry axis of described " U " font.
In the magnetic circuit of this motor, stator excitation magnetic is close, and to be usually greater than the permanent-magnet magnetic of rotor close and easily magnetic saturation occurs at pole shoe toward pole tip place, the resting position impact of shape on rotor of pole shoe is large and affect little on stator excitation magnetic field axis, at even air gap, non-energized and without when significantly rotating retardance, rotor permanent magnet pole will align the pole-face of pole shoe naturally, i.e. its field axis and pole shoe two pole tip place plane orthogonal.Therefore, design pole shoe two pole tip place plane is crossing with the symmetry axis of described " U " font, namely makes axis and the stator field axes intersect of rotor permanent magnet pole, is formed and start angle.The design is ingenious utilizes These characteristics, even if do not use non-homogeneous air gap, also can realize self-starting, but the magnetic resistance eliminating non-homogeneous air gap increases and torque ripple problem.
It is further designed to, and the upper pole tip of described left pole shoe is positioned at the right side of described symmetry axis, and lower pole tip is positioned at the left side of described symmetry axis; The upper pole tip of described right pole shoe is positioned at the right side of described symmetry axis, and lower pole tip is positioned at the left side of described symmetry axis.
The above-mentioned design implemented based on traditional " U " font stator core is: the medial surface indent on the stator core left arm top of described " U " font is formed by the cambered surface on the left of the described p-m rotor face of cylinder, the lower edge of this cambered surface is the lower pole tip of described left pole shoe, this cambered surface connects the upper pole tip stretching to right pole shoe along magnetic conduction; The medial surface indent on the stator core right arm top of described " U " font is formed by the cambered surface on the right side of the described p-m rotor face of cylinder, and the upper edge of this cambered surface is the upper pole tip of described right pole shoe, and the lower of this cambered surface connects the lower pole tip stretching to right pole shoe along magnetic conduction.The prolongation of pole tip increases considerably the polar arc width b of pole-face s, by reducing rotor permanent magnet in proportion, to pass through the magnetic of air-gap close and increase the first-harmonic winding factor k of stator winding by sine relation wl, thus significantly improve the cost performance of motor, compensate for the deficiency of traditional " U " font iron core pole-face polar arc width by the restriction of lamination sawing sheet shape.
Can also be designed to: the stator core of " U " font is made up of upper and lower two parts of assembling front split, top is metallurgical with soft magnetic powder or the left pole shoe of injection molded and right pole shoe, and bottom is the laminated core of pure " U " font as pole body and curvature.During assembling, after described laminated core passes through stator winding, the top of its two arm and the bottom of described left pole shoe and right pole shoe connect as one.This connection is preferably joggle, can reach the more firm fixing magnetic conduction larger with area and contact.If stator winding insulation is fixed on working of plastics, such as be wound in plastic cord coil or further both plastic packagings be integrated, these working of plasticss are preferably formed with the facade of the side being close to described pole shoe, described facade and side are formed with the button bit of concavo-convex interworking, connect for implementing buckle when installing, the top in the left and right arm of described laminated core is pressed in the bottom of described pole shoe.The ferrocart core of powder metallurgy or injection molded has higher stock utilization and working (machining) efficiency than laminated core, and pure " U " font iron core improves lamination sawing sheet utilance further than traditional " U " font iron core, thus reduces costs.
Described left and right pole shoe can be shaped separately and be assemblied in the top of the left and right arm of described laminated core respectively, also can be connected with upper pole tip and lower pole tip and the lower pole tip shape that is formed by connecting is integrated the top being assemblied in the left and right arm of described laminated core by the two upper pole tip, to improve efficiency of assembling and structure is more stable.The position that pole tip connects should be designed and be positioned at from rotor axis remotely, and the part do not connected forms spill mouth, to reduce the impact on starting angle.For reducing leakage field, the thickness of this connection should be no more than 2mm, is preferably 1mm.
Described p-m rotor is preferably rectangle or trapezoidal wave magnetizes, to improve stock utilization and to have more stable startup angle.
The shape of pole tip and upper pole tip and the distance between lower pole tip and lower pole tip or connecting length and the past pole tip level section of stretching out on described left and right pole shoe, especially along symmetrical axial thickness, (magnetic circuit comprising Finite Element calculates) can be calculated by electromagnetism or test and adjust to best numerical value, start and other performance requirement to take into account.
2nd technical scheme of technical solution problem of the present invention is: a kind of draining pump, comprise the impeller of motor and coaxial transmission thereof, wound impeller plays the pump cover of volute effect, the pump housing of supporting motor and pump cover, it is characterized in that, described motor is for using the small permanent magnetic sychronous motor of " U " font iron core described in technical solution problem the 1st technical scheme of the present invention.In addition, for the draining pump of this motor driven, even air gap is more conducive to the fixing of the water proof cover inserted between this pump rotor, improves the stability of structure and size.
Accompanying drawing explanation
Fig. 1 is the small permanent magnetic sychronous motor basic structure schematic diagram that prior art uses " U " font iron core;
Fig. 2 is the small permanent magnetic sychronous motor basic structure schematic diagram that the present invention the 1st embodiment uses " U " font iron core;
Fig. 3 is the small permanent magnetic sychronous motor basic structure schematic diagram that the present invention the 2nd embodiment uses " U " font iron core;
Fig. 4 is the small permanent magnetic sychronous motor basic structure schematic diagram that the present invention the 3rd embodiment uses " U " font iron core;
Fig. 5 is that draining pump of the present invention is by rotor axis and the generalized section parallel with " U " font.
Embodiment
Embodiment of the present invention motor is that improvement forms on the basis that prior art described in background technology uses the small permanent magnetic sychronous motor of " U " font iron core.The basic structure of this motor of prior art as shown in Figure 1, comprising:
---the cylindrical magnet rotor 1 magnetized in radial the two poles of the earth;
---stator 2, comprises laminated core 3 and the stator winding 4 of " U " font; Be one overall by top layer plastics 42 plastic packaging after stator winding 4 is wound in left and right two plastic cord coil 41; The top that the left arm 31 of iron core 3 and right arm 32 expose after passing through left and right two endoporus of plastic cord coil 41 respectively formed respectively pole-face by toward rotor 1 face of cylinder on the left of with the left pole shoe 311 on right side and right pole shoe 316; Polar front shape is two sections of arc surfaces coaxial with rotor 1 that indent forms ladder and connects: along clockwise direction, then the arc surface that radius is larger is before this arc surface that radius is less; The upper pole tip 312 of left pole shoe 311 is all parallel with the symmetry axis 30 of described " U " font with lower pole tip 318 place plane 319 with the upper pole tip 317 of right pole shoe 316 with lower pole tip 313 place plane 314, and 20, stator field axis is vertical with symmetry axis 30.
Therefore, namely the field axis 10 of p-m rotor 1 deflects an angle beta 0 relative to stator field axis 20 to the short namely direction that magnetic resistance is little of air gap and clockwise direction naturally, forms and starts angle.
Said stator structure is that the horizontal segment 33 of pole body and bottom is for yoke with two arms 31,32 that " U " font is vertical, but also having the horizontal segment bottom with " U " font to be pole body is the structure of yoke with two vertical arms, the stator winding of the latter is wound in pole body only on 1 bobbin.
As shown in Figure 2, it mainly changes polar front shape to the improvement of prior art motor basic structure as shown in Figure 1 to the present invention the 1st embodiment motor electromagnetism basic structure, comprising:
---two sections of arc surfaces change and are all less radius, and form even air gap between rotor 1 face of cylinder;
---the upper pole tip 1312 of left pole shoe 1311 plugs in former upper pole tip 312 front along the inner arc surface melting welding of pole-face one to have and coaxially form with the soft iron block 1315.1 of radius inner arc surface, its symmetry axis 30 crossing described " U " font stretches to the upper pole tip 317 of right pole shoe 1316 and is positioned at the right side of symmetry axis 30, and lower pole tip 313 is still positioned at the left side of symmetry axis 30;
---the lower pole tip 1318 of right pole shoe 1316 plugs in former lower pole tip 318 front along the inner arc surface melting welding of pole-face one to have and coaxially form with the soft iron block 1315.2 of radius inner arc surface, its symmetry axis 30 crossing described " U " font stretches to the lower pole tip 313 of left pole shoe 1311 and is positioned at the left side of symmetry axis 30, and upper pole tip 317 is still positioned at the right side of symmetry axis 30;
Therefore, the upper pole tip 1312 of left pole shoe 1311 is parallel with upper pole tip 317 place plane 1319 with the lower pole tip 1318 of right pole shoe 1316 with lower pole tip 313 place plane 1314, and all tilts to intersect to the symmetry axis 30 of described " U " font.Thus, when non-energized and without remarkable retardance, rotor permanent magnet pole aligns the pole-face of pole shoe naturally, namely its field axis 10 and pole shoe two pole tip place plane 1314 and 1319 vertical and and then crossing with the stator field axis 20 being in horizontal direction, formed and start angle β 1, and obviously to increase than the startup angle β 0 of prior art and pole-face width obviously extends.
Soft iron block 1315.1,1315.2 thinnest part (with symmetry axis 30 intersection) thickness should suitably control (being such as no more than 3mm), to reach the magnetic saturation suitable to stator excitation of this place, maintains stator field axis 20 level as far as possible.
Above-mentioned soft iron block in former pole tip plug into can also be designed to the two close contact as the connection such as joggle and self-clinching.
The upper and lower pole tip place plane that also can design only one of them pole shoe is crossing with the symmetry axis of described " U " font and formed and start angle, but effect reduces.
The present invention the 2nd embodiment motor electromagnetism basic structure as shown in Figure 3, the difference of itself and embodiment 1 mainly:
---the stator core of " U " font is made up of upper and lower two parts be separated before assembling, to be iron silicon ratio be on top 17.7 iron powder and the left pole shoe 2311 that is shaped of ferrosilicon powder mixed-powder metallurgy and right pole shoe 2316, bottom is the laminated core 300 of pure " U " font.During assembling, after two arms of iron core 300 pass through the bobbin of stator winding, its top is integrated with the bottom joggle of left pole shoe 2311 and right pole shoe 2316 respectively.For this reason, the place 2315.1 and 2315.2 corresponding concave, convex profile of shaping is met mutually as tenon and mortise in the top of iron core 300 2 arm and the bottom of pole shoe;
---the upper and lower pole tip place plane 2314 of left pole shoe 2311 is parallel with the upper and lower pole tip place plane 2319 of right pole shoe 2316 and all crossing to symmetry axis 30 inclination of " U " font.Thus when non-energized and without remarkable retardance, rotor permanent magnet pole axis line 10 is crossing with stator field axis 20, forms startup angle β 2, but reduces to some extent than the startup angle β 1 of embodiment 1, but the increase of pole-face width.
The present invention the 3rd embodiment motor electromagnetism basic structure as shown in Figure 4, the difference of itself and embodiment 2 mainly:
---the left pole shoe and the right pole shoe that in embodiment 2 are separately two are configured as the top that one thing 3310 is assemblied in laminated core 30 left arm 31 and right arm 32, the upper pole tip 3312 of the left pole shoe of this one thing and the upper pole tip 3317 of right pole shoe have linkage section 37, the lower pole tip 3313 of left pole shoe and the lower pole tip 3318 of right pole shoe have linkage section 38, and linkage section 37,38 is made even with the upper horizontal plane of upper pole tip, the lower horizontal plane of lower pole tip respectively.For reducing leakage field, the thickness of this connection should thin as far as possible (be such as no more than 2mm, be preferably 1mm), can meet mechanical strength needs.One thing 3310 with electrical pure iron powder mixing engineering plastics raw material grain with the manufacturing process injection moulding of similar bonded permanent magnet or extrusion molding.In addition, bottom iron core two arm top and pole shoe, dovetail shapes changes the dovetail groove that the former latter protrudes into into.During assembling, can be pressed in the mortise of the latter along the tenon of rotating shaft direction by the former.
In this embodiment, left pole shoe upper and lower pole tip place plane 3314 is parallel with right pole shoe upper and lower pole tip place plane 3319 and all crossing to symmetry axis 30 inclination of " U " font, thus when non-energized and without remarkable retardance, rotor permanent magnet pole axis line 10 is crossing with stator field axis 20, forms the startup angle identical with embodiment 2.
The further design of the present invention the 2nd, 3 embodiments is:
---plastic cord coil or stator winding connection are formed with bobbin plastic packaging together with laminated core the facade being close to pole shoe side with bobbin or stator winding connection, the side of described pole shoe and the facade of the bobbin mutually place of meeting are formed with corresponding protrusion or recessed button bit, form buckle when mounted to connect, the bottom of pole shoe is pressed the top being connected to laminated core two arm;
---pole shoe is separated with iron core before assembly and is positioned at outside bobbin, therefore the magnetic circuit cross section that its magnetic circuit cross section is greater than the laminated core of ruler coil can be designed easily, to adapt to the situation that powder metallurgy or injection moulding ferrocart core magnetic property are usually less than electrical sheet laminated core.This is these two kinds of magnetic materials in the most just right use of " U " font iron core.Design is further, utilizes the edge effect of axial two ends of p-m rotor, makes the length of p-m rotor about than the axial length long 10% ~ 25% of pole shoe, the axial length of pole shoe is utilized more fully, improves the cost performance of product.
All be designed to even air gap between above-described embodiment rotor, but also do not get rid of the suitably non-homogeneous air gap of increase, can increase further and start angle to strengthen startability.
As shown in Figure 5, this draining pump structure mainly comprises draining pump embodiment of the present invention:
---use permanent magnet synchronous motor (Fig. 5 illustrates the section of the left and right pole shoe one thing 3310 of this stator core in motor and p-m rotor 1) and the receded disk impeller 5 through an actuating mechanism coaxial transmission thereof of " U " font stator core;
---wound impeller plays the pump cover 6 of volute effect;
---supporting is or/and close the annexes such as the pump housing 7 of described permanent magnet synchronous motor, impeller 5 and pump cover 6, bearing 8 and sealing ring 9;
---rotor drum 71, plays impermeable role between the rotor inserting in described permanent magnet synchronous motor.
This embodiment is that improvement forms on the basis that the applicant's publication number is the embodiment draining pump (can refer to the Publication Specification of this patent) of the Chinese utility model patent of CN202954989U, and the stator core in this embodiment motor is mainly replaced by the stator core be made up of the laminated core 300 of pure " U " font and left and right pole shoe one thing 3310 in the present invention the 3rd embodiment motor by its improvement.

Claims (11)

1. use a small permanent magnetic sychronous motor for " U " font iron core, comprising:
---p-m rotor, for radial the two poles of the earth magnetize cylindrical;
---stator, the stator winding that the stator core comprising " U " font passes through with this iron core;
---described stator core comprises the pole body of pure " U " font and the pole-face of curvature and the shaping of this " U " font two arm top leans on the right pole shoe on the right side of the described p-m rotor face of cylinder by the left pole shoe on the left of the described p-m rotor face of cylinder and pole-face, it is characterized in that, two pole tip place planes of at least one pole shoe are crossing with the symmetry axis of described " U " font.
2. according to permanent magnet synchronous motor described in claim 1, it is characterized in that: the upper pole tip of described left pole shoe is positioned at the right side of described symmetry axis, and lower pole tip is positioned at the left side of described symmetry axis; The upper pole tip of described right pole shoe is positioned at the right side of described symmetry axis, and lower pole tip is positioned at the left side of described symmetry axis.
3. according to permanent magnet synchronous motor described in claim 1 or claim 2, it is characterized in that: described p-m rotor is that rectangle or trapezoidal wave magnetize.
4. according to permanent magnet synchronous motor described in claim 2, it is characterized in that: be recessed into by the cambered surface on the left of the described p-m rotor face of cylinder in the medial surface on the stator core left arm top of described " U " font, the lower edge of this cambered surface is the lower pole tip of described left pole shoe, this cambered surface connects the upper pole tip stretching to right pole shoe along magnetic conduction; Be recessed in the medial surface on the stator core right arm top of described " U " font by the cambered surface on the right side of the described p-m rotor face of cylinder, the upper edge of this cambered surface is the upper pole tip of described right pole shoe, and the lower of this cambered surface connects the lower pole tip stretching to right pole shoe along magnetic conduction.
5. according to permanent magnet synchronous motor described in claim 1 or claim 2, it is characterized in that: the stator core of " U " font is made up of upper and lower two parts of assembling front split, top is metallurgical with soft magnetic powder or the left pole shoe of injection molded and right pole shoe, and bottom is the laminated core of pure " U " font as pole body and curvature; During assembling, after described laminated core passes through described stator winding, the top of its two arm is connected with the bottom of described left pole shoe and right pole shoe.
6. according to permanent magnet synchronous motor described in claim 5, it is characterized in that: the connection of the top of described two arms and the bottom of described left pole shoe and right pole shoe is joggle.
7. according to permanent magnet synchronous motor described in claim 5, it is characterized in that: on described left and right pole shoe, pole tip is connected with upper pole tip and lower pole tip and the lower pole tip shape that is formed by connecting is integrated, and is then assemblied in the top of the left and right arm of described laminated core.
8. according to permanent magnet synchronous motor described in claim 7, it is characterized in that: the position that on described left and right pole shoe, pole tip is connected with upper pole tip and lower pole tip is connected with lower pole tip is positioned at pole tip from the part away from rotor axis, non-coupling part forms spill mouth.
9. according to permanent magnet synchronous motor described in claim 8, it is characterized in that: the thickness of described connection is not more than 2mm.
10. according to permanent magnet synchronous motor described in claim 2, it is characterized in that: described left pole shoe and the thickness of right pole shoe in described symmetry axis place are not more than 3mm.
11. 1 kinds of draining pumps, comprise the impeller of motor and coaxial transmission thereof, and wound impeller plays the pump cover of volute effect, and the pump housing of supporting motor and pump cover, is characterized in that, described motor is motor described in claim any one of claim 1 ~ 10.
CN201310462837.3A 2013-10-07 2013-10-07 A kind of small permanent magnetic sychronous motor and draining pump using " U " font iron core Active CN103501095B (en)

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CN105322730B (en) * 2014-07-28 2017-09-15 江门市地尔汉宇电器股份有限公司 A kind of permagnetic synchronous motor and preparation method thereof
CN105915124B (en) * 2016-06-08 2019-11-19 汉宇集团股份有限公司 The centrifugal pump of U-iron core single-phase permanent-magnet synchronous motor driving
CN108988599B (en) * 2017-05-30 2020-07-17 汉宇集团股份有限公司 U-shaped iron core single-phase permanent magnet synchronous motor
CN107332368B (en) * 2017-07-26 2019-01-22 大连碧蓝节能环保科技有限公司 Drainage pump of washing machine electric motor combined-type stator

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CN202602396U (en) * 2012-04-26 2012-12-12 江门市地尔汉宇电器股份有限公司 Assembly-type U-type stator core, permanent magnet motor and pump with the same

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US5118977A (en) * 1989-12-14 1992-06-02 U.S. Philips Corporation Two-pole single-phase synchronous motor with permanent-magnet rotor, and starting device for use in the single-phase synchronous motor
CN101854105A (en) * 2009-11-24 2010-10-06 于佳衣 Single-phase self-starting permanent magnet synchronous motor
CN202602396U (en) * 2012-04-26 2012-12-12 江门市地尔汉宇电器股份有限公司 Assembly-type U-type stator core, permanent magnet motor and pump with the same

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Patentee after: Hanyu Group Co., Ltd.

Address before: 529040 No. 336 Qinglan Road, Jiangmen High-tech Development Zone, Guangdong Province

Patentee before: Jiangmen Idear-hanyu Electrical Joint-stock Co., Ltd.