CN101414776A - Inner rotor brushless motor and manufacturing method thereof - Google Patents
Inner rotor brushless motor and manufacturing method thereof Download PDFInfo
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- CN101414776A CN101414776A CNA2008101694071A CN200810169407A CN101414776A CN 101414776 A CN101414776 A CN 101414776A CN A2008101694071 A CNA2008101694071 A CN A2008101694071A CN 200810169407 A CN200810169407 A CN 200810169407A CN 101414776 A CN101414776 A CN 101414776A
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Abstract
The provides a brushless motor of inner rotator and manufacturing method thereof, which will not reduce the circular degree of a core and the winding duty cycle of the space in the groove, to prevent the loss of magnetic flux. A stator core is divided into a core tooth part and a core yoke part to form, wherein the core tooth part is composed of shoulders radially projected according to the number identical to that of the magnetic pole of the stator and combined parts extended in the interconnected form along the inner circumferences of the shoulders, and the core yoke part is cylindrical and pressed to the outer circumference of the tooth part. Clearances are formed on the combined parts. The stator winding is formed by inserting wound insulating spools composed of winding coil on the insulating spools on each shoulder.
Description
Technical field
Thereby the present invention relates to inner rotor brushless motor and manufacture method thereof that electric current that a kind of position probing with the motor stator side is by convection into stator winding with the magnet magnetic pole of sensor rotor-side carries out switching controls.
Background technology
In the inner rotor brushless motor, the position probing that is installed on the stator is located at the magnet magnetic pole of rotor-side with sensor, thereby the electric current that is by convection into stator winding carries out switching controls.Groove is uncovered towards interior all sides between the magnetic pole that is used to wind the line of the stator core of such brushless motor, and therefore, it is comparatively difficult using coil winding machine to wind the line.
Fig. 7 is the figure of stator core of the prior art of illustration patent documentation 1 record, (A) vertical view of expression stator core, the vertical view after (B) expression launches.Stator core has the annulus all in the casing and the tooth portion of radial configuration of being fixed in.The shape of a plurality of segmentation iron core portions for upwards cutting by each toothed portion in week allows to rotate mutually.Thus, when coiling, make segmentation iron core portion rotate the distance that enlarges between the adjacent teeth portion, thereby coiling is installed easily.But illustrative stator core is cut apart formation tooth portion, and therefore the circularity under the annular arrangement state reduces.In needing the purposes of High Accuracy Control, be unfavorable for using.
In order to solve such problem, disclose in the patent documentation 2 a kind of can be at the stator core that on groove between the uncovered magnetic pole of outer circumferential side, winds the line.Fig. 8 is the figure of the stator core of expression patent documentation 2 records, (A) vertical view of expression tooth portion, and (B) vertical view of expression annulus (C) is represented from the observed expanded view of interior all sides of the stator core that has installed around coil.Shown in Fig. 8 (A), a plurality of tooth portion is radial configuration in the periphery of the rotor hole that inserts for rotor towards foreign side.Form the groove to become the space that installs around coil between the adjacent tooth portion, teat is set, be formed on groove, installing around the peristome of coil between teat and the teat in the periphery of tooth portion.Coil passed peristome and after being wound on the groove, be pressed into the iron core annulus shown in Fig. 8 (B) and constitute stator core.
This structure can wind the line from the outer circumferential side of tooth portion, therefore can use coil winding machine easily to wind the line, and the coil-winding efficiency of operation is improved.But in illustrated stator core construction, the bridge part of the interior all sides between the adjacent tooth portion makes a part of magnetic flux short circuit that is produced and can not pass through rotor.The magnetic flux of this short circuit is helpless to produce torque, therefore becomes invalid magnetic flux.Therefore, as Fig. 8 (A) or (C), need make non-bridge part to a part of laminated iron core excision bridge part, but, the mechanical strength of iron core be reduced if increase the ratio of non-bridge part.Thus, winding tension can be applied directly on the iron core when coil winding machine winds the line, thereby causes core configuration to deform, and the circularity of iron core reduces.On the contrary, if will keep the circularity of iron core, then can not increase the ratio of non-bridge part, the magnetic flux of generation has loss.And therefore the mobile space of the nozzle end of coil winding machine need, can not be occupied in the groove by winding and have living space in groove, and the guaranteeing of stacking factor is restricted.
Patent documentation 1: TOHKEMY 2005-39992 communique
Patent documentation 2: No. 2502641 communique of Japan's special permission.
Summary of the invention
The objective of the invention is to address the above problem a little, groove makes the coiling that utilizes coil winding machine to carry out become easy towards the uncovered stator core construction of outer circumferential side between the magnetic pole that employing is used to wind the line, and can not reduce the circularity of iron core, and can not reduce the stacking factor in space in the groove, can increase the ratio of the non-bridge part of laminated iron core, prevent the loss of the magnetic flux that produces with respect to bridge part.
Inner rotor brushless motor of the present invention be located at the magnet magnetic pole of rotor-side with the position probing that is installed on the motor stator side with sensor, thereby the electric current that is by convection into stator winding carries out switching controls.Stator core is split into iron core teeth portion and iron core yoke and constitutes, this iron core teeth portion is by constituting to radially outstanding a plurality of arms with in the joint portion that interior all sides of these arms are extended in the mode of mutual binding with the quantity consistent with the stator magnet number of poles, this iron core yoke is tubular and the outer circumferential side that is pressed into this iron core teeth portion, is formed with the space on above-mentioned joint portion.Stator winding is by inserting on each of above-mentioned arm and constitute twining the insulation bobbin that winds line that winding constitutes on the insulation bobbin.
In addition, in the manufacture method of inner rotor brushless motor of the present invention, constitute iron core teeth portion, this iron core teeth portion is by pressing the quantity consistent with the stator magnet number of poles to radially outstanding arm, constitute with the joint portion of extending in the mode of mutual binding in interior all sides of these arms, on above-mentioned joint portion, be formed with the space, by inserting on each of above-mentioned arm and constitute stator winding twining the insulation bobbin that winds line that winding constitutes on the insulation bobbin, be inserted with the above-mentioned arm top that winds the insulation bobbin of line by chimeric on the chimeric recess of the inner peripheral surface side that is formed at tubular iron core yoke, constitute stator core and cut apart by above-mentioned iron core teeth portion and the above-mentioned iron core yoke that is pressed into the outer circumferential side of this iron core teeth portion.
Iron core teeth portion is stacked the 1st kind of steel plate and the 2nd kind of these two kinds of steel plates of steel plate and constitute, lay respectively at motor drive shaft and by above-mentioned arm with in interior all sides the short circuit portion that these arms link is constituted, on the joint portion that the 2nd kind of steel plate of the 1st kind of steel plate inboard links between with each arm, be provided with the space to the 1st kind of steel plate at two ends.Stamping-out is that the 1st kind of steel plate of set shape and the 2nd kind of steel plate are for linking the all-in-one-piece structure by the caulking part riveted and fixed that will form on each arm.By the chimeric arm top that is inserted with the insulation bobbin that winds line on the chimeric recess that is formed at iron core yoke inner peripheral surface side, carry out above-mentioned iron core yoke being pressed into to the outer circumferential side of tooth portion.
According to the present invention, by stator core being made the segmentation iron core structure, do not need to be provided with the required space of coiling nozzle between magnetic pole in the groove, improved the degree of freedom of stator core design.In addition, do not need to introduce the nozzle coil winding machine that requires hi-Fix mechanism, can use general purpose coil winding machine.
And, by making the arm that the insulation bobbin that will wind line is inserted into iron core teeth portion, do not need to be provided with the interior space of groove between the required magnetic pole of coiling nozzle, improved occupation efficiency.Owing to,, can suppress moment and reduce so need not worry to have reduced the short circuit portion of perimembranous in the iron core teeth portion owing to winding tension makes the iron core distortion not directly to the stator core coiling.And, can keep iron core teeth portion internal diameter circularity, reduce the teeth groove pulsation.Thus, can constitute the motor that can be used for accurate control.
Description of drawings
Fig. 1 is the exploded perspective view of inner rotor brushless motor that the present invention is specialized.
Fig. 2 is the integrally-built cutaway view of inner rotor brushless motor shown in Figure 1.
Fig. 3 is the exploded perspective view of the magnetic pole of the stator iron core of expression segmenting structure.
Fig. 4 is the stereogram of expression insulation bobbin.
Fig. 5 (A) is fitted to the figure that the state of arm is represented with the insulation bobbin that will wind line, (B) is the figure that is represented with the state that has been pressed into the iron core yoke on the basis of structure shown in (A).
Fig. 6 is motor is installed to the figure that the state on the motor mount plate is represented.
Fig. 7 is the figure of the stator core of the prior art put down in writing of illustration patent documentation 1.
Fig. 8 is the figure of the stator core put down in writing of expression patent documentation 2.
Embodiment
Below, based on illustrating the present invention.Fig. 1 is the exploded perspective view of inner-rotor brushless DC motor that the present invention is specialized.Fig. 1 (A) represents housing, (B) expression stator, and (C) expression rotor, (D) expression sensor base plate (E) is represented cap, (F) represents the overall structure that assembles.Fig. 2 is integrally-built cutaway view, and (A) among Fig. 2 is to dissect the figure that forms with mutual different plane orthogonal respectively with (B).
Motor chassis is made of metal or the resinous housing that end hollow cylinder shape arranged and metal or resinous cap.This cap is sleeved on the stage portion of the interior perimembranous of being located at shell nozzle portion.Be fixed with the stator that is made of pole core and winding on the internal face of drum housing, this pole core is the segmenting structure that is divided into iron core yoke and iron core teeth portion, and this winding twines by the insulation bobbin, for the details of stator with aftermentioned.The location of stator utilizes the stator block of being located on the housing inner peripheral surface to carry out.Constitute the motor stator side by motor chassis and the stator that is fixed on this motor chassis, this motor chassis is made of housing and cap.Central separately accommodating at housing bottom and cap is fixed with the bearing that is used for the supporting rotor rotating shaft.One end of rotating shaft and certain one or both ends in the other end are projected into the motor chassis outside, drive the external device (ED) that is combined on these certain one or both ends.
With rotor surface that the magnetic pole of the stator iron core is faced mutually on, a plurality of magnet that constitute rotor magnetic pole are installed on the yoke that is fixed on the rotating shaft.As rotor magnet, can use to be configured as neodymium iron boron connection magnet (Nd-Fe-B BOND MAGNET) cylindraceous.As this rotor, can adopt surperficial magnet type rotor (SPM) or built-in magnet type rotor structures such as (IPM).Dispose the position probing transducer, come the detection rotor position of rotation to utilize the rotor magnet that is had on this rotor surface.This position probing is installed on the sensor base plate with connector with transducer.The projection of the location usefulness of sensor base plate by will being located at its outer peripheral face is fitted to the otch of being located on the housing end face and carries out the location of sensor base plate with respect to housing.In addition, also sensor base plate can be fixed on the cap.In illustrated embodiment, make the structure of coming the magnetic flux of detection rotor magnet generation with transducer (being illustrated as 3), but also can come the detection rotor position of rotation by the sensor-magnet that the position probing special use different with rotor magnet is set by the such position probing of the hall device that is installed on the motor stator side.
Fig. 3 is the exploded perspective view of the magnetic pole of the stator iron core of expression segmenting structure, and (A) expression iron core teeth portion (B) represents its partial enlarged drawing, and (C) expression iron core yoke in addition, is to be used to illustrate stacked fixing figure (D).Illustrated iron core teeth portion is by constituting towards radially outstanding arm with in the joint portion that interior all sides of these arms are extended in the mode of mutual binding by the quantity consistent with the stator magnet number of poles.As everyone knows, the motor pole core is stacked and constitute with steel plate, Fig. 3 (A) or (B) shown in iron core teeth portion be stacked two kinds of steel plates and constituting.The 1st kind of steel plate is the steel plate that 1 (or a spot of many) are respectively arranged at motor drive shaft direction two ends, by arm with in interior all sides the short circuit portion (void-free joint portion) that these arms link constituted.The 2nd kind of steel plate is all steel plates of the inboard except the 1st kind of steel plate that is positioned at two ends, has the structure that the joint portion that links between with each arm is provided with the space, is equivalent to the structure that the central authorities of short circuit portion with above-mentioned the 1st kind of steel plate cut.
The 1st kind of steel plate with such shape be laminated in the mould after the 2nd kind of steel plate become set shape by the forcing press stamping-out.Then, in mould, each arm riveted and fixed is illustrated as 2 caulking part.About this riveted and fixed, shown in Fig. 3 (D), only perforate simultaneously when carrying out stamping-out on the orlop steel plate on all steel plates that are laminated on the orlop steel plate, forms the caulking part that partly comes off of the shape of protruding half left and right thickness when stamping-out.Then, each riveted and fixed of carrying out to contraposition one by one when stacked in mould.Thus, although except 1 of two ends or a spot of many steel plates, between each arm, being provided with the space,, shown in Fig. 3 (A), becoming like that and link the all-in-one-piece structure when mould takes out iron core teeth portion.
Iron core yoke shown in Fig. 3 (C) constitutes the general cylindrical shape shape with circular circumference face by stacked steel plate.The inner peripheral surface side of iron core yoke has makes the shape that is flexed into whole circular shape with the smooth interior perimembranous of stator magnet number of poles equal number, and the central authorities of perimembranous form for the chimeric recess in arm top in each is smooth.Perimembranous was facial relative with the outside of insulation bobbin described later in this was smooth.
Fig. 4 is the stereogram of expression insulation bobbin, (A) the insulation bobbin that wound the line of expression, (B) and (C) represent to observe respectively the stereogram of the preceding insulation bobbin of coiling respectively from different direction mutually.The insulation bobbin that is used for the neat resin system (for example nylon resin) of twining of coil insulation and coil is by the tabular outside face relative with the smooth inner peripheral surface of iron core yoke inner peripheral surface, constitute with the joint portion opposed inside face of iron core teeth portion with the facial and inboard facial linking part that links in the outside, and is provided with the arm embedded hole of all these parts of break-through.Have in inner break-through this arm embedded hole linking part around twine winding.The axial length of insulated wire axial ratio iron core teeth portion is long, forms the location division in both sides.On the insulation bobbin, after the coiling, be fitted on the arm of iron core teeth portion.Be pressed into gently by on the two sides of embedded hole inside of insulation bobbin, rib (projection) being set, carry out that this is chimeric.Winding is that 1 groove is concentrated coiling.
So, owing to make the structure of on the arm of iron core teeth portion, inserting the insulation bobbin that winds line, therefore can make the insulation bobbin that winds line with general purpose coil winding machine, and because not directly to the stator core coiling, so need not worry to make the iron core distortion because of winding tension.Therefore, the short circuit portion that can reduce perimembranous in the iron core teeth portion suppresses moment and reduces, and also can keep circularity simultaneously, reduces the teeth groove pulsation.And, do not need to be provided with the interior space of groove between the required magnetic pole of coiling nozzle, can reduce the space between each winding with respectively winding the insulation bobbin closely configuration mutually of line, therefore improve stacking factor.
In addition, the winding of this inner-rotor brushless DC motor normally each winding of U phase, V phase, W phase with Y connection or the wiring of Δ shape, no matter which kind of wiring, input terminal all is 3.As everyone knows, 3 input terminals are connected with DC power supply by control device (electronic rectifier device).The rotor number of poles: stator poles is 2n:3n or 4n:3n series (integer that n=3 is above).As shown in the figure, when adopting the magnetic pole of the stator of 9 utmost points, 3 ground of every phase are connected in series at the winding of the first-class arranged spaced of circumference.Therefore, in illustrated structure, for each phase, preferably the state that connects with each windings in series of the bobbin that will insulate per 3 by a group is fitted on the pairing arm.
Fig. 5 (A) is with the state of the chimeric respectively insulation bobbin that winds line on the arm of iron core teeth portion and the figure that is represented.At this moment, the arm top is projected into outer circumferential side.Then, shown in Fig. 5 (B), on the basis of structure shown in Fig. 5 (A), be pressed into the iron core yoke shown in Fig. 3 (C).At this moment, be pressed into the chimeric recess (Fig. 3 (C)) of being located at iron core yoke inner peripheral surface from the arm top that the insulated wire aixs cylinder goes out and fastened.Structure shown in Fig. 5 (B) is equivalent to the stator shown in above-mentioned Fig. 1 (B).
Fig. 6 is the figure that is represented to use mounting screw that motor is installed to the state on the motor mount plate.By motor shell and motor mount plate are made the metallic parts, the heat that produced by stator winding is dispelled the heat through stator core and then by metallic motor shell and the metallic motor mount plate that is installed on this motor shell.The inner rotor brushless motor that cooling effectiveness like this is good and circularity improves and can carry out accurate control can be used as for example ink-jet printer balladeur train feeding motor (driving ink gun) or paper feeding motor (driving the sheet feed roller bar).
Claims (8)
1. an inner rotor brushless motor be located at the magnet magnetic pole of rotor-side with the position probing that is installed on the motor stator side with sensor, thereby the electric current that is by convection into stator winding carries out switching controls, wherein,
Stator core is split into iron core teeth portion and iron core yoke and constitutes, this iron core teeth portion is by constituting to radially outstanding a plurality of arms with in the joint portion that interior all sides of these arms are extended in the mode of mutual binding, this iron core yoke is tubular and the outer circumferential side that is pressed into this iron core teeth portion, on above-mentioned joint portion, be formed with the space
Stator winding is by inserting on each of above-mentioned arm and constitute twining the insulation bobbin that winds line that winding constitutes on the insulation bobbin.
2. inner rotor brushless motor according to claim 1 is characterized in that,
Above-mentioned iron core teeth portion is stacked the 1st kind of steel plate and the 2nd kind of these two kinds of steel plates of steel plate and constitute, lay respectively at motor drive shaft and by above-mentioned arm with in interior all sides the short circuit portion that these arms link is constituted, have the structure that is provided with the space on the joint portion that links between with each arm at the 2nd kind of steel plate of the 1st kind of steel plate inboard to the 1st kind of steel plate at two ends.
3. inner rotor brushless motor according to claim 2 is characterized in that,
Stamping-out is that the 1st kind of steel plate of set shape and the 2nd kind of steel plate are for linking the all-in-one-piece structure by the caulking part riveted and fixed that will be formed on each arm.
4. inner rotor brushless motor according to claim 3 is characterized in that,
By the chimeric arm top that is inserted with the insulation bobbin that winds line on the chimeric recess of the inner peripheral surface side that is formed at the iron core yoke, carry out above-mentioned iron core yoke being pressed into to the outer circumferential side of above-mentioned iron core teeth portion.
5. inner rotor brushless motor according to claim 3 is characterized in that,
Above-mentioned insulation bobbin is by the tabular outside face relative with perimembranous in iron core yoke inner peripheral surface smooth, constitute with the joint portion opposed inside face of iron core teeth portion with linking part that should the facial and inboard face binding in outside, and be provided with the arm embedded hole of break-through outside face, inboard face and linking part, around above-mentioned linking part, twine winding.
6. inner rotor brushless motor according to claim 3 is characterized in that,
Each winding of the U phase of said stator winding, V phase, W phase is Y wiring or Δ wiring, and during the integer more than establishing n=3, the rotor number of poles: stator poles is 2n:3n or 4n:3n.
7. inner rotor brushless motor according to claim 3 is characterized in that,
The motor mount plate of motor shell and this motor shell of installation is that metal is made, make the heat that will produce by stator winding through the stator core and then the structure of dispelling the heat by metal motor shell and motor mount plate, with this inner rotor brushless motor as the printer carriage feeding with motor or paper feeding motor.
8. the manufacture method of an inner rotor brushless motor, this inner rotor brushless motor is located at the magnet magnetic pole of rotor-side with the position probing that is installed on the motor stator side with sensor, thus the electric current that is by convection into stator winding carries out switching controls, in the method,
Constitute iron core teeth portion, this iron core teeth portion is formed with the space by constituting to radially outstanding arm with in the joint portion that interior all sides of these arms are extended in the mode of mutual binding by the quantity consistent with the stator magnet number of poles on above-mentioned joint portion,
Constitute stator winding by inserting on each of above-mentioned arm at the insulation bobbin that winds line that constitutes of winding around on the insulation bobbin,
Be inserted with the above-mentioned arm top that winds the insulation bobbin of line by chimeric on the chimeric recess of the inner peripheral surface side that is formed at tubular iron core yoke, constitute stator core and cut apart by above-mentioned iron core teeth portion and the above-mentioned iron core yoke that is pressed into the outer circumferential side of this iron core teeth portion.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2007268863 | 2007-10-16 | ||
| JP2007268863A JP2009100531A (en) | 2007-10-16 | 2007-10-16 | Inner-rotor brushless motor and manufacturing method therefor |
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| CN101414776A true CN101414776A (en) | 2009-04-22 |
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| CNA2008101694071A Pending CN101414776A (en) | 2007-10-16 | 2008-10-16 | Inner rotor brushless motor and manufacturing method thereof |
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Assignee: Dalian wanbaozhi Motor Co. Ltd. Assignor: Mabuchi Motor Co., Ltd. Contract record no.: 2010990000712 Denomination of invention: Inner rotor brushless motor and manufacturing method thereof License type: Common License Open date: 20090422 Record date: 20100903 Assignee: Mabuchi motor (Dongguan) Co., Ltd. Assignor: Mabuchi Motor Co., Ltd. Contract record no.: 2010990000650 Denomination of invention: Inner rotor brushless motor and manufacturing method thereof License type: Common License Open date: 20090422 Record date: 20100903 |
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Assignee: Dongguan Daojiao Mabuchi Motor Co.,Ltd. Assignor: Mabuchi Motor Co., Ltd. Contract record no.: 2011990001087 Denomination of invention: Inner rotor brushless motor and manufacturing method thereof License type: Common License Open date: 20090422 Record date: 20111212 Assignee: Mabuchi motor (Yingtan) Co., Ltd. Assignor: Mabuchi Motor Co., Ltd. Contract record no.: 2011990001086 Denomination of invention: Inner rotor brushless motor and manufacturing method thereof License type: Common License Open date: 20090422 Record date: 20111212 |
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