CN1881746A - Single-phase blushless motor - Google Patents

Single-phase blushless motor Download PDF

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Publication number
CN1881746A
CN1881746A CN 200610080945 CN200610080945A CN1881746A CN 1881746 A CN1881746 A CN 1881746A CN 200610080945 CN200610080945 CN 200610080945 CN 200610080945 A CN200610080945 A CN 200610080945A CN 1881746 A CN1881746 A CN 1881746A
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CN
China
Prior art keywords
mentioned
salient pole
rotation
brushless
torque
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CN 200610080945
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Chinese (zh)
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CN1881746B (en
Inventor
高桥勇树
稻本繁典
清原纯一
镰仓吉克
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三美电机株式会社
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Priority to JP2005151493 priority
Priority to JP2005151493A priority patent/JP4715305B2/en
Application filed by 三美电机株式会社 filed Critical 三美电机株式会社
Publication of CN1881746A publication Critical patent/CN1881746A/en
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Publication of CN1881746B publication Critical patent/CN1881746B/en

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Abstract

The present invention can inhibit the decrease of the phase difference between the generating torque and the braking torque capable of becoming the inducement of vibration and the noise and can decrease torque pulsation. The monophase brushless motor has a stator with winding wound onto the salient pole cogs of iron core and a rotor with ring permanent magnets configured inside the stator iron core with gap left in between. The distance between the center of the stator iron core and the end of the salient pole cog varies with the rotating direction of the salient pole cogs, and so does the gap. The ratio between minimum gap (d1) and the maximum gap (d2) is 1/3-1/2.

Description

Brushless single phase motor
Technical field
The present invention relates to brushless single phase motor, particularly realize reducing the brushless single phase motor of cogging torque by the interaction of stator core and rotor permanent magnet.
Background technology
It is big, controlled good etc. that general brushless motor not only has torque as the DC motor feature, and the reliability height, so be widely used at industrial circle.Wherein, the special brushless motor that unipolar type and three facies patterns are arranged of universalness widely.
Particularly three-phase brushless motor need be switched on the three-phase alternating current that differs from 120 ° of phase places between mutual on the electric angle.Therefore, need three magnetometric sensors and use this magnetometric sensor and have the drive circuit of three-phase handoff functionality for the switching of carrying out coil electricity.So, for example, use motor as blowing cooling, be applicable to the motor that must form at an easy rate, so be not very wise move at economic aspect.
In this case, it is desirable to: get final product with a magnetometric sensor, and also can constitute, and use brushless single phase motor by the cheap drive circuit of a phase.
Figure 12 is the magnetic force circuit pattern figure of the existing example of unipolar type brushless motor of expression, and Figure 13 is the figure that amplifies the part of motor among Figure 12.In Figure 12 and Figure 13, rotor 3 formations that this brushless motor 1 is installed and is fixed in the stator 3 of device (not shown) side and is driven in rotation with respect to this stator 2.
Rotor 3 is made of annular permanent magnet 4 and the yoke portion 5 that 6 utmost points are magnetized.On the other hand, stator 2 has the stator core 6 that is disposed at permanent magnet 4 inner peripheral surface sides.
The for example stacked silicon steel plate of stator core 6 and forming, will rotor 3 the axle (not shown) the axle upwardly extending 6 slits 7,7 ... and slit 8,8 ... along the circumferential direction on position of halving, set, and at this slit 7,7 ... and slit 8,8 ... in be provided with 6 the salient pole teeth 9,9 that are roughly T word shape that five equilibrium ground in a circumferential direction separates ...Each salient pole tooth 9,9 ... on be wound with lead, form coil 10 as spiral.
And, under the situation of this brushless single phase motor 1, will lead to coil 10,10 ... electric current switch successively according to the position of rotor 3, obtain continuous revolving force.
Figure 14 is the performance plot of representing the position of rotation of brushless motor 1 rotor 3 and taking place to concern between the torque, and vertical pivot is torque (gfcm), and transverse axis is the corner (deg) of rotor 3.Though the brushless single phase motor 1 of type shown in Figure 12 can obtain generation torque T1 shown in Figure 14, in energising switching point (Figure 14 A portion), having torque T1 is 0 position of rotation, promptly so-called " dead point ".When rotor 3 stops on this " dead point ", owing to can not produce torque, and also become impossible by the position probing that magnetometric sensor carried out, so can not self-starting.
To this, known systems has, on the direction of rotation of rotor 3, processing stator core 6 salient pole tooth 9 the increment face so that the gap lengths of stator core 6 and permanent magnet 4 can change, and produce brake torque for example shown in Figure 15 (デ イ テ Application ト ト Le Network) (cogging torque) T2, and it is added to torque T1 takes place to obtain synthetic torque T3 shown in Figure 16, thereby do not have " dead point " and carry out self-starting (for example, with reference to No. 3873897 patent of patent documentation 1-U.S.) glibly.Have, Figure 15 and Figure 16 also are again: vertical pivot is torque (gfcm), and transverse axis is the corner (deg) of rotor 3.Here, the synthetic torque T3 of motor makes the torque pulsation quantitative changeization by the phase place of brake torque T2 and the phase difference of generation torque T1.
Existing type motor according to patent documentation 1 invention disclosed, though the phase place of brake torque changes according to the inclination of the gap lengths of iron core and permanent magnet, but under the inadequate situation of phase difference of the phase place of brake torque and brake torque, torque pulsation increases, and become the reason of vibrating noise, and on motor mass, become big problem.
Summary of the invention
So, remain the technical solution problem below having produced: suppress to become the generation torque of inducement of vibrating noise and brake torque phase difference minimizing and torque pulsation is reduced, so the present invention is a purpose to address this problem.
The present invention is for achieving the above object and the technical scheme that proposes, scheme 1 described invention is a kind of brushless single phase motor, possess the stator that is wound with coil on the salient pole tooth of stator core and with this stator core between on radial direction, leave the space and have the rotor of the annular permanent magnet of relative configuration, the distance that makes from the center of said stator iron core the increment face of above-mentioned salient pole tooth is at the different brushless single phase motors that constitute so that have gap the direction of rotation both ends of the size in above-mentioned space at above-mentioned salient pole tooth between the direction of rotation both ends of above-mentioned salient pole tooth, it is characterized in that, provide a kind of minimum aperture length that on a end, forms to be made as d1 with the direction of rotation of above-mentioned salient pole tooth, the maximum interspace length that forms on the other end of above-mentioned direction of rotation is made as under the situation of d2, and the pass between the maximum interspace length d 2 that forms on the minimum aperture length d 1 that forms on the end of the direction of rotation of above-mentioned salient pole tooth and the other end of above-mentioned direction of rotation is d1: d2=1: 2 to d1: d2=1: 3 brushless single phase motor.
Constitute according to this, brake torque and the phase difference that torque takes place are 1/4th angle of angle between magnetic pole, and promptly 15 °, the effect by phase cross-over has reduced brake torque and the pulsating quantity of the synthetic torque of torque takes place.
According to scheme 1, scheme 2 described inventions provide a kind of brushless single phase motor, it is characterized in that the increment surface of above-mentioned salient pole tooth forms the convex curved surface that above-mentioned space increases gradually in from end of minimum aperture length side to the scope of another end of maximum interspace length side.
According to this formation, because continuous convex curved surface forms the increment surface of salient pole tooth in utilizing from the increment surface of the salient pole tooth that is processed with maximum interspace length to the scope on the increment surface of the salient pole tooth that is processed with minimum aperture length, so obtained above-mentioned gap lengths continuous and different motor on the rotor direction of rotation.
According to scheme 2, scheme 3 described inventions provide a kind of brushless single phase motor, it is characterized in that the cross section of above-mentioned convex curved surface is circular-arc, this is circular-arc, and to make with point with mind-set predetermined direction off-centre from the said stator iron core be the identical or approximate cardinal principle circular arc of circular arc at center.
According to this formation, owing to the cross section peripheral shape of above-mentioned continuous curve surface be have with near the eccentric point the above-mentioned stator core center be the circular arc described of center or with its similar convex curve of circular arc substantially, so make the salient pole tooth on the increment surface that size with above-mentioned gap lengths gradually changes easily on direction of rotation.
According to scheme 1,2 or 3, scheme 4 described inventions provide a kind of brushless single phase motor, it is characterized in that, making the slit width on the direction of rotation of above-mentioned adjacent salient pole between cog is 7 °.
Constituting according to this, is 7 ° by the slit width on the direction of rotation that makes adjacent salient pole between cog, can suppress to take place the reducing of phase difference of torque and brake torque.
According to scheme 1,2,3 or 4, scheme 5 described inventions provide a kind of brushless single phase motor, it is characterized in that, the said stator iron core has 6 above-mentioned salient pole teeth that equally spaced are provided with on circumferentially, its N utmost point of above-mentioned rotor permanent magnet and the S utmost point interlock on circumferentially and the magnetization of five equilibrium ground amounts to 6 above-mentioned salient pole teeth.
Constitute according to this, obtained on circumferentially, interlocking and magnetizing equably 6 magnetic poles and 6 brushless single phase motors that salient pole is constructed, like this, can produce 1/4 phase cross-over of magnetic pole with respect to each magnetic pole.
The invention effect:
Scheme 1 described invention is because the phase difference of brake torque and generation torque increases and synthesize the pulsating quantity reduction of torque, so can suppress the vibration and the noise of motor.And, though brushless single phase motor is identical with the quantity of iron core salient pole at textural magnetic pole, but can produce 1/4th phase cross-overs of magnetic pole with respect to each magnetic pole, thus can with number of magnetic poles irrespectively and efficient bring into play the reduction effect of above-mentioned pulsating quantity well.
Scheme 2 described inventions, because by taking end of salient pole is the formation of minimum aperture length and can increase brake torque and the phase difference of torque takes place, so except the invention effect of scheme 1, also can easily obtain having the motor that meets torque pulsation reduction effect in ground with purposes.
Scheme 3 described inventions are because above-mentioned gap lengths is different gradually on the rotor direction of rotation, so except the invention effect of scheme 2, also can further suppress the vibrating noise of motor effectively.
Scheme 4 described inventions, because but efficient suppresses to take place the minimizing of the phase difference of torque and brake torque well, so except the invention effect of scheme 1,2 or 3, not only suppress the effect of the vibrating noise of motor, and improved the revolving property and the further control precision that improves motor of motor.
Scheme 5 inventions disclosed can easily be made and have by 6 magnetic poles of the above-mentioned special result of the invention gained of scheme 1,2,3 or 4 and the brushless single phase motor of 6 salient poles structure.
Description of drawings
Fig. 1 is the outside drawing of the brushless single phase motor represented as the present invention's the 1st execution mode.
Fig. 2 is the stereogram of brushless single phase motor shown in Figure 1.
Fig. 3 is the in-built magnetic force circuit pattern figure of expression brushless single phase motor shown in Figure 1.
Fig. 4 is the part enlarged drawing in magnetic force shown in Figure 3 loop.
Fig. 5 is the vertical view of stator core shown in Figure 3.
Fig. 6 is that the pass is d1 between minimum aperture length d 1 and the maximum interspace length d 2: d2=1: the generation torque of 3 brushless single phase motor shown in Figure 1 and the performance plot of brake torque.
Fig. 7 is be d1 with closing between minimum aperture length d 1 and the maximum interspace length d 2: d2=1: the performance plot of the synthetic torque that the generation torque of 3 brushless single phase motor shown in Figure 1 and brake torque are synthetic.
Fig. 8 is that the pass is d1 between minimum aperture length d 1 and the maximum interspace length d 2: d2=1: the generation torque of 1.5 brushless single phase motor and the performance plot of brake torque.
Fig. 9 is be d1 with closing between minimum aperture length d 1 and the maximum interspace length d 2: d2=1: the performance plot of the synthetic torque that the generation torque of 1.5 brushless single phase motor and brake torque are synthetic.
Figure 10 is that the pass is d1 between minimum aperture length d 1 and the maximum interspace length d 2: d2=1: the generation torque of the brushless single phase motor of 2 second embodiment of the invention and the performance plot of brake torque.
Figure 11 is be d1 with closing between minimum aperture length d 1 and the maximum interspace length d 2: d2=1: the performance plot of the synthetic torque that the generation torque of the brushless single phase motor of 2 second embodiment of the invention and brake torque are synthetic.
Figure 12 is the in-built magnetic force circuit pattern figure of the existing brushless single phase motor of expression.
Figure 13 is the part enlarged drawing in magnetic force loop shown in Figure 12.
Figure 14 is the performance plot of the generation torque of brushless motor shown in Figure 12.
Figure 15 is the performance plot of the braking generation torque of brushless motor shown in Figure 12.
Figure 16 is with the generation torque of brushless motor shown in Figure 12 and the synthetic synthetic torque characteristic figure of brake torque.
Among the figure:
11-brushless single phase motor 12-substrate 13-shell
14-stator 15-rotor 16-driver IC
17-magnetometric sensor 18-bearing 19-bearing
20-rotor box 21-permanent magnet (rotor permanent magnet)
22-axle 23-stator core 24-slit
25-slit 26-salient pole tooth 27-coil
Another end of an end 29-salient pole tooth of 28-salient pole tooth
30-increment face d-gap lengths d1-maximum interspace length
D2-maximum interspace length L-distance theta-slit width
Embodiment
To enumerate suitable embodiment below brushless single phase motor of the present invention will be described.Optimal way of the present invention be used to realize to suppress to become the generation torque of inducement of vibrating noise and brake torque phase difference minimizing and effectively reduce the purpose of synthetic torque, its realization is passed through: possess stator and go out the space in the radial direction sky and have the rotor of the annular permanent magnet of relative configuration, and make distance different between above-mentioned direction of rotation both ends so that have gap the direction of rotation both ends of the size in above-mentioned space at the salient pole tooth from the center O of stator core to the increment face of salient pole tooth, and the minimum aperture length that forms on the end with the direction of rotation of salient pole tooth is made as d1, the maximum interspace length that forms on the other end of direction of rotation is made as under the situation of d2, relation between the maximum interspace length d 2 that forms on the minimum aperture length d 1 that forms on one end of the direction of rotation of above-mentioned salient pole tooth and the other end of above-mentioned direction of rotation is set at d1: d2=1: 2 to d1: d2=1: 3, the increment surface of above-mentioned salient pole tooth forms the convex curved surface that above-mentioned space increases gradually in from end of minimum aperture length side to the scope of another end of maximum interspace length side, this cardinal principle is circular-arc, and to comprise with the predetermined migration point from above-mentioned center O and above-mentioned increment surface opposite side be the circular arc at center and identical or approximate cardinal principle circular arc, and making the slit width on the direction of rotation of adjacent salient pole between cog is 7 °.
The size that the cross sectional shape of above-mentioned continuous curve surface can form above-mentioned space is different gradually on direction of rotation, for example, describes (with reference to Fig. 5) in the following method.Promptly, the movable straight line apart from size L that will have between minimum aperture length side one end and the above-mentioned core center O is made as T, along with advancing to maximum interspace length side other end F from minimum aperture length side one end E, this increment surface is oblique to the center O inclination lentamente, make cardinal extremity and the predetermined direction of movable straight line T, the direction that promptly connects center O and minimum aperture length side one end E is roughly the right angle, and the shift position to minimum aperture length side one end E opposition side (downside among Fig. 5) in, the front end of the movable straight line T circular-arc geometric locus of above-mentioned front end when rotating to maximum interspace length is described.
Certainly, above-mentioned curved surface of the present invention is not limited to this, so long as the circular-arc front of cardinal principle that in from the increment surface of minimum aperture length side to the scope on the increment surface of maximum interspace length side above-mentioned space is increased gradually then all is contained in the motor of the present invention.
Embodiment
Fig. 1 is the outside drawing of the brushless single phase motor represented as the present invention's the 1st execution mode, and Fig. 2 is the exploded perspective view of brushless single phase motor shown in Figure 1.Fig. 3-Fig. 5 represents the details of its each several part.Have, use outer-rotor brushless motor though graphic form is applicable to the blowing cooling of electronic equipment, the present invention is not limited to this certainly.
The brushless single phase motor 11 of Figure 1 and Figure 2 is the external rotor shape, and is the brushless single phase motor of 6 magnetic poles, 6 salient pole shapes.Brushless single phase motor 11 by with respect in device (not shown) side through the fixing shells 13 of substrate 12 and stator of installing 14 and the rotor 15 that is driven in rotation with respect to this stator 14 constitute.In addition, except that the magnetometric sensor 17 of the position of rotation of the driver IC 16 of the circuit that the supply that is assembled with the controlling and driving electric current etc. and drive motor have been installed and detection rotor 15, rotor also has been installed with bearing 18 and bearing 19 on the substrate 12.
Rotor 15 is made of rotor box 20 and permanent magnet 21 and axle 22.Rotor box 20 is hat, and an inner coaxial end of fixing axle 22.This axle 22, its another distolateral embedding bearing 18 and bearing 19 can be held rotatably with respect to stator 14.In addition, be fixed with annular permanent magnet 21 on the inner peripheral surface of rotor box 20.Permanent magnet 21 towards circumferencial direction with the N utmost point, the S utmost point alternately with uniformly-spaced configuration, and on inner peripheral surface, be provided with 6 magnetic poles.
Stator 14 is disposed at the inner peripheral surface side of permanent magnet 21 with one heart, and has the ring-type stator core 23 of the periphery that is fixed on shell 13.This stator core 23 is by lamination silicon steel plate and forming for example, and will be at upwardly extending 6 slits 24,24 of axle of axle 22 ... and 6 slits 25,25 ... along the circumferential direction five equilibrium ground is provided with.By this slit 24,24 ... and slit 25,25 ..., in a circumferential direction with 60 ° of branches such as interval be provided with 6 the salient pole teeth 26,26 that are roughly T word shape salient pole that become separation ...Be formed with the coil 27 that coil of wire coiled institute fixing turn is formed as coiling at each salient pole tooth 26,26.Constituting of each coil 27 is connected respectively to driver IC 16, supplies with driving with electric current and obtain continuous revolving force by the control of driver IC 16.
As amplification among Fig. 4 is represented, the salient pole tooth 26,26 of stator 14 ... each increment face (outside end face of tooth) 30 be above-mentioned salient pole tooth 26,26 ... and the gap lengths between the inner peripheral surface of permanent magnet 21 is salient pole tooth 26,26 on the direction of rotation of rotor 15 ... direction of rotation both ends 28,29 between gap is arranged.In the present embodiment, the distance (gap lengths) from the center O of said stator iron core 23 to the increment face 30 of above-mentioned salient pole tooth forms the direction of rotation both ends 28,29 of above-mentioned salient pole tooth 26 different mutually.Specifically, the direction of rotation one end 28 side manufacturings of salient pole tooth 26 have minimum aperture length d 1, and the 29 side manufacturings of the direction of rotation other end have maximum interspace length d 2, are formed by continuous curve surface S to the direction of rotation other end 29 sides from direction of rotation one end 28 sides.
Have again, in the present embodiment, relation between the maximum interspace length d 2 of the minimum aperture length d 1 of direction of rotation one end 28 sides and the direction of rotation other end 29 is set at d1: d2=1: 3.In addition, the curved surface S shape of above-mentioned tooth front end 30 is because here to form with near the eccentric point C core center O be that the circular arc at center is planar, so the radius of curvature L of minimum aperture length side end 28 is identical with the radius of curvature R of maximum interspace length side end 29.
As shown in Figure 5, if the radial alignment that will connect with the center O of the direction of rotation center P of the salient pole tooth 26A of maximum interspace length side end 29 sides adjacent of above-mentioned salient pole tooth 26 and stator core 23 is made as D, then in Fig. 5, above-mentioned eccentric point C be positioned on the radial alignment D from center O to the lower side (side opposite) with salient pole tooth 26 move on the position of some.
The facing of curved surface S roughly is circular-arc curve use-case such as following method is described.Promptly, if will substantially end points be made as H1, outer point is made as H2 the inboard (core center O side) of the boning out H of equal length with distance from minimum aperture length side one end 28 to center O, be the radially downward side direction of straight line D (away from the direction of the maximal clearance length side other end 29) continuous dislocation of starting point with core center O then with inboard end points H1, simultaneously, when boning out H rotation was moved to the maximal clearance length side other end 29 sides, the convex curve of being described by outer point H2 formed above-mentioned curve.At this moment, the geometric locus of outer point H2 is the cardinal principle circular shape that the distance of 30 in core center O and increment face diminishes along with cun pin direction of up time in figure, as mentioned above, be similar to being the circular arc that the center is described from core center O point C of downside off-centre to figure.
Have, the width θ of the slit 25 that adjacent salient pole tooth is 26,26 is set at 7 ° again.If so form, then can suppress to take place the minimizing of the phase difference of torque and brake torque, thereby can suppress the vibration and the noise of motor.
Then, for effect and the effect of confirming brushless single phase motor 11 of the present invention, following embodiment 1,2,3 is verified.Result to this embodiment 1-3 describes.
Fig. 6 is that to be illustrated in structure with present embodiment identical and relation between the maximum interspace length d 2 of the minimum aperture length d 1 of direction of rotation one end 28 sides and the direction of rotation other end 29 sides is set at d1: d2=1: 3 and the width θ of the slit 25 of 26,26 in adjacent salient pole tooth is set under 7 ° the situation, torque and the brake torque performance plot with respect to the relation of corner takes place.Have, among the figure, T1 represents to take place torque again, and T2 represents brake torque.The synthetic torque T3 of torque T1 and brake torque T2 takes place in Fig. 7 presentation graphs 6.In Fig. 6 and Fig. 7, vertical pivot is torque (gfcm), and transverse axis is the corner (deg) of rotor 3.
From Figure 6 and Figure 7 as can be known, in the structure of embodiment 1 and present embodiment, the phase difference that torque T1 and brake torque T2 take place is the angle of angle 1/4th between magnetic pole, promptly 15 °, and can reduce the pulsation of the synthetic torque more than 35% by the effect of phase deviation.
Fig. 8 is a comparative example, be that to be illustrated in structure with present embodiment identical and relation between the maximum interspace length d 2 of the minimum aperture length d 1 of direction of rotation one end 28 sides and the direction of rotation other end 29 sides is set at d1: d2=1: 1.5 and the width θ of the slit 25 of 26,26 in adjacent salient pole tooth is set under 7 ° the situation, torque and the brake torque performance plot with respect to the relation of corner takes place.Have, among the figure, T1 represents to take place torque again, and T2 represents brake torque.The synthetic torque T3 of torque T1 and brake torque T2 takes place in Fig. 9 presentation graphs 8.
Here, relation between the maximum interspace length d 2 of the minimum aperture length d 1 of direction of rotation one end 28 sides and the direction of rotation other end 29 sides is set at d1: d2=1: the result of the embodiment 1 (present embodiment) of 3 Figure 6 and Figure 7 and be set at d1: d2=1: the result of 1.5 Fig. 8 and comparative example shown in Figure 9 compares.At d1: d2=1: in the structure of 1.5 comparative example, the phase difference that torque T1 and brake torque T2 take place is limited to 11 °, fewer 4 ° with the structure of embodiment 1.Its result, during 40AT (for example coil is 80 circles, and input current is 0.5A), the torque pulsation during for input in the comparative example is 77.7gfcm, and is relative therewith, is 64.2gfcm among the embodiment 1.Hence one can see that, by using the structure of present embodiment, can reduce by 17.4% torque pulsation.
Figure 10 is expression second execution mode of the present invention, relation between the maximum interspace length d 2 of the minimum aperture length d 1 of direction of rotation one end 28 sides and the direction of rotation other end 29 sides is set at d1: d2=1: 2 and the width θ of the slit 25 of 26,26 in adjacent salient pole tooth is set under 7 ° the situation, torque and the brake torque performance plot with respect to the relation of corner takes place.Have, among the figure, T1 represents to take place torque again, and T2 represents brake torque.Figure 11 represents to take place among Figure 10 the synthetic torque T3 of torque T1 and brake torque T2.
In the result of the structure of embodiment 2, the phase difference that torque T1 and brake torque T2 take place is 13 °, and during 40AT (for example coil is 80 circles, and input current is 0.5A), the torque pulsation during input is 68.0gfcm.The d1 of itself and above-mentioned comparative example: d2=1: 1.5, have the effect that can reduce by 12.5% torque pulsation.
Have, in the present invention, in order to reduce torque pulsation, the generation torque when it is desirable to make actual startup and the peak value of brake torque equate again.Brake torque so can correspondingly keep the relation of minimum aperture length d 1 and maximum interspace length d 2, changes the size in gap owing to change because of shape, material and the whole magnetic force loop (magnetic circuit width, number of magnetic poles) of permanent magnet.Textural, though the brushless single phase motor magnetic pole is identical with the quantity of salient pole tooth 26 because the present invention can be with respect to 1/4th phase deviations of each magnetic pole generation magnetic pole, thus can with number of magnetic poles irrespectively efficient bring into play torque pulsation well and reduce effect.
In addition, the present invention can carry out multiple variation under the situation that does not break away from spirit of the present invention, and the present invention also comprises these variations certainly.

Claims (5)

1. brushless single phase motor, possess the stator that is wound with coil on the salient pole tooth of stator core and with this stator core between on radial direction, leave the space and have the rotor of the annular permanent magnet of relative configuration, and be to make from the center of said stator iron core the distance of the increment face of above-mentioned salient pole tooth at the brushless single phase motors that constitute so that produce gap the direction of rotation both ends of the size in above-mentioned space at above-mentioned salient pole tooth different between the direction of rotation both ends of above-mentioned salient pole tooth, it is characterized in that:
The minimum aperture length that forms on the end with the direction of rotation of above-mentioned salient pole tooth is made as the maximum interspace length that forms on the other end of d1, above-mentioned direction of rotation and is made as under the situation of d2, and the pass between the maximum interspace length d 2 that forms on the minimum aperture length d 1 that forms on the end of the direction of rotation of above-mentioned salient pole tooth and the other end of above-mentioned direction of rotation is from d1: d2=1: 2 to d1: d2=1: 3.
2. brushless single phase motor according to claim 1 is characterized in that:
The increment surface of above-mentioned salient pole tooth forms the convex curved surface that above-mentioned space increases gradually in from end of minimum aperture length side to the scope of another end of maximum interspace length side.
3. brushless single phase motor according to claim 2 is characterized in that:
The cross section of above-mentioned convex curved surface is circular-arc, and this is circular-arc, and to make with point with mind-set predetermined direction off-centre from the said stator iron core be the identical or approximate cardinal principle circular arc of circular arc at center.
4. according to claim 1,2 or 3 described brushless single phase motors, it is characterized in that:
Making the slit width on the direction of rotation of above-mentioned adjacent salient pole between cog is 7 °.
5. according to claim 1,2,3 or 4 described brushless single phase motors, it is characterized in that:
The said stator iron core has 6 above-mentioned salient pole teeth that equally spaced are provided with on circumferentially, its N utmost point of above-mentioned permanent magnet and the S utmost point interlock on circumferentially and the magnetization of five equilibrium ground amounts to 6 above-mentioned salient pole teeth.
CN2006100809454A 2005-05-24 2006-05-23 Single-phase blushless motor CN1881746B (en)

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TWI414130B (en) 2013-11-01

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