CN100581029C - Permanent magnet rotary motor - Google Patents
Permanent magnet rotary motor Download PDFInfo
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- CN100581029C CN100581029C CN200510091741A CN200510091741A CN100581029C CN 100581029 C CN100581029 C CN 100581029C CN 200510091741 A CN200510091741 A CN 200510091741A CN 200510091741 A CN200510091741 A CN 200510091741A CN 100581029 C CN100581029 C CN 100581029C
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Abstract
There is provided a permanent magnet rotary motor in which manufacture of a stator core is facilitated. The permanent magnet rotary motor includes P rotor magnetic pole sections and N slots. In this permanent magnet rotary motor, a least common multiple LCM (P, N) is set to be different from a least common multiple LCM (P/2, N), and an exciting winding is wound on each of N stator magnetic pole sections arranged in a peripheral direction so that a 120 DEG current phase difference is obtained. N/2 divided cores 13 A, 13 C, 13 E, 13 G, 13 I, and 13 K of a first divided core group and N/2 divided cores 13 B, 13 D, 13 F, 13 H, 13 J, and 13 L of a second divided core group constitute a stator core 2 . Cross-sectional shapes of the divided cores in the first and second divided core groups arranged on both sides of each of slots 9 A to 9 L taken in a direction perpendicular to an axis line passing through the center of a rotor 3 are shaped to be axisymmetrical with respect to a virtual line passing through the middle of an opening portion 9 a or 9 b of each slot and the axis line of the rotor 3. An open angle Wa of an opening portion 9 a is set to be smaller than an open angle Wb of an opening portion 9 b.
Description
Technical field
The present invention relates to a kind of permanent magnet rotary motor that possesses the rotor rotation of the rotor magnetic pole department that constitutes by permanent magnet.
Background technology
Permanent-magnet type motor has rotor and stator.Rotor, a plurality of rotor magnetic pole departments that have rotor core and constitute by permanent magnet.Stator possesses a plurality of stator pole piece, is provided with stator core and the 2 above mutually excitation winding that are wound on these stator pole piece towards a plurality of grooves of the peristome of rotor core opening.Known in the motor of rotor magnetic pole department use permanent magnet, comprise the torque and the thrust of pulsation (cogging torque) when non-loaded.This cogging torque hinders rotation smoothly, becomes the reason of vibration and speed fluctuation etc.For this reason, existing as the gimmick that reduces cogging torque, proposition the groove that forms skewed slot on stator core and the rotor core etc. (below, be called skew) technology, adopt the permanent magnet (below, be called eccentric shape permanent magnet) of the different eccentric type in the position of center of arc of the center of arc make outer peripheral face and inner peripheral surface.But, form skew, then produce and reduce torque, the productive problem of reduction motor.In addition, if adopt eccentric shape permanent magnet, then produce the magnetic density that to raise, can not seek the problem of high torque densityization.
For this reason, open in the permanent magnet rotary motor shown in the 2004-15967 communique (patent documentation 1) the spy, alternate configurations is provided with to the 1st kind of stator pole piece of circumferentially outstanding a pair of protuberance and does not have the 2nd kind of stator pole piece of a pair of protuberance in the set magnetic pole strength formation portion of stator pole piece front end.In this permanent magnet rotary motor, at the stator pole piece front end, produce the torque figure of the waveform different wave of the torque figure that is taken place with other adjacent stator pole piece front portions, replenish the cogging that adjacent stator pole piece takes place mutually, suppress the cogging torque that is taken place on the rotor.
In the permanent magnet rotary motor shown in No. 3505347 communique of special permission (patent documentation 2), in circumferential 2 kinds of different stator pole piece of alternate configurations magnetic pole strength circumferential size.
In addition, the spy opens in the permanent magnet rotary motor shown in the flat 11-178298 communique (patent documentation 4), in 2 kinds of different stator pole piece of magnetic pole strength curvature of circumferentially alternately arranging stator pole piece.
In addition, the spy opens in the permanent magnet rotary motor shown in the 2001-309625 communique (patent documentation 4), and is different mutually along the circumferential width dimensions of measuring of peristome that is formed on a plurality of grooves on the stator core.
Patent documentation 1: the spy opens the 2004-15967 communique
Patent documentation 2: specially permit communique No. 3505347
Patent documentation 3: the spy opens flat 11-178298 communique
Patent documentation 4: the spy opens the 2001-309625 communique
But, constitute in the permanent magnet rotary motor of aforesaid stator core, the problem of existence is to prepare to be arranged on the variform 2 kinds of split cores of protuberance of stator pole piece front end, and the variety of components when not only making stator core increases, and the assembly of stator core is numerous and diverse.
Particularly the permanet magnet type rotation motor of patent documentation 4 is 8 utmost points, 24 grooves, and the least common multiple LCM of P (8) and N (24) (P, N), least common multiple LCM (P/2, N) the numerical value (24) of 1/2 (4) and the N (24) of P for equating.In addition, along the current phase that flows in per 2 winding portions of circumferential array, every 120 ° of skews, and according to+U ,+U ,+V ,+V ,+W ,+sequence offsets of W....This permanent magnet rotary motor, if the opening angle of setting slot as mentioned above then suppresses leakage field, induced voltage raises, and produces the problem that torque decline, torque pulsation increase.
Summary of the invention
The object of the present invention is to provide a kind of permanent magnet rotary motor that can reduce cogging torque and torque pulsation.
The object of the present invention is to provide a kind of permanent magnet rotary motor of easy manufacturing stator core.
The present invention has rotor and stator as the permanent magnet rotary motor of improvement object.Rotor comprises rotor core and the individual rotor magnetic pole department of installing with respect to this rotor core of P (P is the natural even number more than 4) that is made of permanent magnet.P rotor magnetic pole department, along rotor core circumferentially with the configuration of the angle intervals of 360 °/P.In addition, stator comprises stator core and N winding portion.Stator core comprises individual stator pole piece of N (N is 6 multiple) with and magnetic pole strength that circumferential lengths equate opposed with rotor core and N the groove that has towards the peristome of rotor core opening.N stator pole piece and N groove replace alignment arrangements circumferentially with the angle intervals of 360 °/2N.And, winding portion, its formation is to concentrate respectively N stator pole piece to twine excitation winding.Permanent magnet of the present invention, and the least common multiple LCM of P and N (P, N), least common multiple LCM (P/2, N) difference of 1/2 and the N of P.In addition, along the electric current that flows in 3 winding portions of circumferential adjacent arrangement, 120 ° of phase places stagger respectively.Promptly along the electric current of the winding portion of circumferential array, become+U ,+V ,+W ,+U ,+V ,+order of W....
Among the present invention, N groove is grouped into: being the N/2 groove of formation the 1st groove group of the 1st angle and open angle at the open angle of the peristome that circumferentially records is the N/2 groove less than formation the 2nd groove group of the 2nd angle of the 1st angle.Also have, so-called here " open angle of peristome " is to link the both ends of periphery of rotor of channel opening portion and 2 angles that imaginary line is intersegmental of rotor center respectively.And, constitute stator core with N/2 the split core that belongs to the 2nd split core group by N/2 the split core that belongs to the 1st split core group.Specifically, stator core, its formation is circumferentially to replace the split core that alignment arrangements belongs to the split core of the 1st split core group and belongs to the 2nd split core group.And, be configured in the split core that belongs to the 1st split core group and the split core that belongs to the 2nd split core group of 1 groove both sides, its shape of cross section separately and orthogonal axe direction by rotor center forms the shape with respect to the imaginary line line symmetry of center by channel opening portion and rotor axis.For this reason, the groove that then belongs to the groove of the 1st groove group and belong to the 2nd groove group is arranged alternately in circumferentially.
Permanent magnet rotary motor of the present invention belongs to the groove of the 1st groove group and the groove of the 2nd groove group and is arranged alternately in circumferentially, thereby the open angle difference of 2 adjacent channel opening portions equates respectively every the open angle of the peristome of a groove.Thereby in the position of the big groove of the open angle of peristome, the torque of rotor is big, and in the position of the little groove of the open angle of peristome, the cogging torque of rotor is little.Composite effect is being brought into play in the increase of this torque and the reduction of cogging torque, is keeping under the state of torque, can generally reduce cogging torque and torque pulsation across stator integral body.
Particularly in permanent magnet rotary motor of the present invention, its formation is: the least common multiple LCM (P of P and N, N), 1/2 of P and the least common multiple LCM (P/2 of N, N) difference, along the electric current that flows in 3 winding portions of circumferential adjacent arrangement, respectively every 120 ° of phase deviations, therefore, can raise torque and reduce torque pulsation.Think this be because, along the phase place of the electric current of the winding portion of circumferential array become+U ,+V ,+W ,+U ,+V ,+order of W..., thereby flux concentrating is in the center of stator pole piece.
In addition, have the split core that belongs to the 1st split core group of above-mentioned shape and belong to the split core of the 2nd split core group, the contour shape of the split core of seeing from direction of rotor axis direction that belongs to the 1st split core group is identical with the contour shape of the split core of seeing from rotor axis direction other direction that belongs to the 2nd split core group.That is, the split core Rotate 180 of shape that will be identical with the split core that belongs to the 1st split core group ° just can prepare to belong to the split core of the 2nd split core group.Consequently,, can adopt the split core of a kind of shape, obtain not increase variety of components and can reduce cogging torque and make the advantage of stator core easily according to the present invention.
Here so-called rotor is included in the permanent magnet surface configuration type of rotor core surface configuration permanent magnet and buries two kinds of the permanent magnet internally-arranged types of permanent magnet underground in rotor core.In addition, so-called rotor magnetic pole department is to utilize the existence of permanent magnet and the magnetic pole piece that forms in certain zone.Also there is permanent magnet with 2 above same polarities to separate combinations of gaps and constitutes the situation of 1 magnetic pole piece.For example, thereby 2 permanent magnets separate the situation that the specified gap combination forms 1 magnetic pole piece, and it is 1/2 times of permanent magnet number that rotor magnetic pole department is counted P.In addition, between 2 adjacent same polarity permanent magnets of burying underground, permanent magnet is not set and forms the situation of the polarity that shows heteropolarity, except that the part that permanent magnet is set, permanent magnet is not set and shows that the part of heteropolarity also constitutes rotor magnetic pole department.For example, form to show the situation of the part of heteropolarity between 2 same polarity permanent magnets that rotor magnetic pole department is buried underground, it is 2 times of permanent magnet number that rotor magnetic pole department is counted P.
Also have, the differential seat angle of the 1st angle Wa and the 2nd angle Wb, be preferably [360 °/LCM (P, N)] * (4/3)-1 degree is to the differential seat angle of [360 °/LCM (P, N)] * scope that (4/3)+1 is spent.If making differential seat angle is the interior value of this scope, then can reduce cogging torque greatly.Also have, during discontented this scope of differential seat angle or when surpassing, cogging torque all shows the tendency that raises.
Specifically, the split core, comprise arcuation yoke formation portion, from the substantial middle of yoke formation portion to rotor-side outstanding and twine excitation winding the winding wound portion, be wholely set magnetic pole strength formation portion at winding wound portion front end.Magnetic pole strength formation portion possesses 1 protuberance that extends along above-mentioned yoke formation portion.At this moment, the magnetic pole strength formation portion end that protuberance is not set that belongs to the magnetic pole strength formation portion end that protuberance is not set of split core of the 1st split core group and the split core that belongs to the 2nd split core group is relative, forms the peristome with the 1st angle of the groove that belongs to the 1st groove group between them.And the protuberance of split core that belongs to the 1st split core group is relative with the protuberance of the split core that belongs to the 2nd split core group, forms the peristome with the 2nd angle of the groove that belongs to the 2nd groove group between them.
Also have, can be provided with along the extension of yoke formation portion and respectively to circumferential two side-prominent the 1st and the 2nd different protuberances of outstanding size in magnetic pole strength formation portion.At this moment, the 1st protuberance of split core that belongs to the 1st split core group is relative with the 1st protuberance of the split core that belongs to the 2nd split core group, forms the peristome with the 1st angle of the groove that belongs to the 1st groove group between them.In addition, the 2nd protuberance of split core that belongs to the 1st split core group is relative with the 2nd protuberance of the split core that belongs to the 2nd split core group, forms the peristome with the 2nd angle of the groove that belongs to the 2nd groove group between them.In this split core, respectively to the shape of 2 side-prominent protuberances of periphery of rotor, thereby the cogging torque that can obtain to expect reduces and the torque increase by suitable design.Also have, no matter under which kind of situation, the shape of protuberance is arbitrarily.
Bury permanent magnet underground and when constituting rotor magnetic pole department in rotor core, the surface of the part that is embedded permanent magnet of rotor core preferably crookedly constitutes and makes it outstanding to stator side.If like this, then utilize the structure of rotor core, can reduce cogging torque more.
Also have, P rotor magnetic pole department is embedded in rotor core inside, and the outer peripheral face part corresponding with rotor magnetic pole department of rotor core is crooked and when the diametric(al) outside is outstanding, if P is 16, N is 12, then can obtain the permanent magnet rotary motor of practicality.
In addition, when P rotor magnetic pole department is installed in the rotor core outer peripheral face,, then can obtain practical permanent magnet rotary motor if P is 8, N is 12.
The effect of invention
According to the present invention, by open angle in circumferential alternate channel opening portion, thereby, the composite effect that performance torque increase, cogging torque reduce, have and keeping under the state of torque, can generally reduce the advantage of cogging torque and torque pulsation across stator integral body.
In addition, according to the present invention, belong to the split core of the 1st split core group and belong to the split core of the 2nd split core group, the contour shape of the contour shape of the split core of seeing from direction of rotor axis direction that belongs to the 1st split core group and the split core that belongs to the 2nd split core group seen from rotor axis direction other direction is identical shaped.Thereby by with identical shaped split core Rotate 180 °, thereby therefore the split core that can prepare to belong to the split core of the 1st split core group and belong to the 2nd split core group, adopts the split core of a kind of shape to get final product.Consequently, obtain not increase variety of components and can reduce cogging torque and make the advantage of stator core easily.
Particularly in permanent magnet rotary motor of the present invention, its formation is the least common multiple LCM (P that makes P and N, N), 1/2 of P and the least common multiple LCM (P/2 of N, N) difference, along the electric current that flows in 3 winding portions of circumferential adjacent arrangement, therefore per 120 ° of phase deviations, can raise torque and reduce torque pulsation.Think this be because, along the phase place of the electric current of the winding portion of circumferential array become+U ,+V ,+W ,+U ,+V ,+order of W..., thereby flux concentrating is in the center of stator pole piece.
Description of drawings
Fig. 1 is used to illustrate the stator of permanent magnet rotary motor of the 1st execution mode of the present invention and the skeleton diagram of rotor.
Fig. 2 is the relation of the value of the value of differential seat angle Wa-Wb of investigation permanent magnet rotary motor shown in Figure 1 and cogging torque, represents its result's figure.
Fig. 3 is the relation of the value of the value of differential seat angle Wa-Wb of investigation permanent magnet rotary motor shown in Figure 1 and torque, represents its result's figure.
Fig. 4 is the relation of the value of the value of differential seat angle Wa-Wb of investigation permanent magnet rotary motor shown in Figure 1 and torque pulsation, represents its result's figure.
Fig. 5 is the relation of the mean value of the value of the peaked relation of the value of differential seat angle Wa-Wb of investigation permanent magnet rotary motor shown in Figure 1 and rotor eccentricity power and differential seat angle Wa-Wb and rotor eccentricity power, represents its result's figure.
Fig. 6 is used to illustrate the stator of permanent magnet rotary motor of the 2nd execution mode of the present invention and the skeleton diagram of rotor.
Fig. 7 is in the investigation permanent magnet rotary motor shown in Figure 6, and the relation of the angle of rotor the during value of angle changing difference Wa-Wb and the value of cogging torque is represented its result's figure.
Fig. 8 is the figure of the relation of the angle of rotor of the expression permanent magnet rotary motor that is used to test and torque and torque pulsation.
Among the figure: the 1-stator; The 3-rotor; 9A～9L-groove; 9a-the 1st peristome; 9b-the 2nd peristome; 13A～13L-split core; 13a-yoke formation portion; 13b-winding wound portion; 13c-magnetic pole strength formation portion; The 13d-protuberance; The 15-steel plate; The 17a-flexure plane; The 19-permanent magnet; Wa, Wb-the 1st and the 2nd angle.
Embodiment
Below, with reference to accompanying drawing embodiments of the present invention are described.Fig. 1 is used to illustrate the stator 1 of permanent magnet rotary motor of the 1st execution mode of the present invention and the skeleton diagram of rotor 3.As shown in Figure 1, stator 1 has stator core 2 and winding portion 11.Stator core 2 possesses the yoke 5 of tubular and 12 stator pole piece 7 of giving prominence to from yoke 5 interior circumferentially centers.12 stator pole piece 7 its leading sections have magnetic pole strength 7a respectively.
To be 12 split core 13A～13L replace opposite state (with the state of Rotate 180 °) with the inside and outside that to be combined in rotor 3 circumferential for stator core 2, its formation.Split core 13A～13L is to constitute at the stacked a plurality of steel plates 15 of rotor 3 axis directions.13A is attached with symbol description to the split core, and then each split core possesses the arcuation yoke formation 13a of portion, side-prominent and twine the winding wound portion 13b of excitation winding and be wholely set the magnetic pole strength formation 13c of portion at winding wound portion 13b front end to rotor 3 from the substantial middle of the yoke formation 13a of portion respectively.On each winding wound portion 13b, concentrate the winding excitation winding and constitute winding portion 11.Along the electric current that flows in 3 winding portions 11 of circumferential adjacent arrangement, with electrical degree every 120 ° of phase deviations.That is, the phase place along the electric current that flows in 12 winding portions 11 of circumferential array, become+U ,+V ,+W ,+U ,+V ,+order of W....Also have,, and in Fig. 1, be represented by dotted lines winding portion 11 for easy understanding.The magnetic pole strength formation 13c of portion possesses 1 the protuberance 13d that extends along the yoke formation 13a of portion.12 split core 13A～13L comprise 6 (N/2 is individual) split cores (13B, 13D, 13F, 13H, 13J, 13L) that belong to the 2nd split core group that 6 (N/2) split cores (13A, 13C, 13E, 13G, 13I, 13K) that belong to the 1st split core group that protuberance 13d extends to a circumferential direction and protuberance 13d extend to another circumferential direction.Thereby, stator core 2 is made of circumferentially replacing alignment arrangements 6 (N/2) split cores (13B, 13D, 13F, 13H, 13J, 13L) that belong to 6 of the 1st split core group (N/2) split cores (13A, 13C, 13E, 13G, 13I, 13K) and belong to the 2nd split core group.
In the present embodiment, be configured in the split core that belongs to the 1st split core group (for example 13A) of 1 groove (for example 9A) both sides and belong to the split core (for example 13B) of the 2nd split core group, its shape of cross sections separately and orthogonal axe directions by rotor 3 center 3a form the shape with respect to the imaginary line PL line symmetry of center by groove 9A peristome and rotor 3 axis.And, the magnetic pole strength formation portion 13c end that protuberance 13d is not set that belongs to the magnetic pole strength formation portion 13c end that protuberance 13d is not set of split core (13A, 13C, 13E, 13G, 13I, 13K) of the 1st split core group and the split core that belongs to the 2nd split core group (13B, 13D, 13F, 13H, 13J, 13L) is relative, forms the peristome with the 1st angle Wa of the groove (9A, 9C, 9E, 9G, 9I, 9K) that belongs to the 1st groove group between them.And, the protuberance 13d of split core (13A, 13C, 13E, 13G, 13I, 13K) that belongs to the 1st split core group is relative with the protuberance 13d of the split core that belongs to the 2nd split core group (13B, 13D, 13F, 13H, 13J, 13L), forms the peristome with the 2nd angle Wb of the groove (9B, 9D, 9F, 9H, 9J, 9L) that belongs to the 2nd groove group between them.
Also have, under the situation of specific the 1st angle Wa and the 2nd angle Wb, at first supposition links circumferential both ends of the rotor 3 of groove 9 peristomes and the line segment of rotor 3 center 3a.And, will be the open angle (Wa, Wb) of peristome with respect to the viewpoint definition between 2 line segments of peristome two ends supposition.As mentioned above, open angle has the channel opening portion that belongs to the 2nd groove group of the 2nd angle Wb, and 13d is relative for its protuberance, and open angle has the channel opening portion that belongs to the 1st groove group of the 1st angle Wa, its protuberance 13d is not relative, thereby the 2nd angle Wb is less than the 1st angle Wa.Therefore, 12 (N) grooves are grouped into: be 6 (N/2) grooves (9A, 9C, 9E, 9G, 9I, 9K) of formation the 1st groove group of the 1st angle and open angle 6 (N/2 is individual) grooves (9B, 9D, 9F, 9H, 9J, 9L) less than formation the 2nd groove group of the 2nd angle of the 1st angle along the open angle of the peristome that circumferentially records.
In this example, 12 split core 13A～13L are combined into ring-type and after constituting ring-type stator core constituting body, ring-shaped frame heat is engaged in the ring bodies periphery of split core 13, form stator core 2.About this technology, open flat 9-308141 communique applicant's preceding application spy and have been described in detail.Also have, can certainly carry out heat at the yoke formation 13a of portion both ends of the surface coating adhesive and cooperate.
As mentioned above, this routine permanent magnet rotation motor has the structure of 16 utmost points, 12 grooves.Thereby, the least common multiple LCM of P (16) and N (12) (P, N), (P/2 is 48 and 24 N), is different numerical value mutually for the least common multiple LCM of 1/2 (8) and the N (12) of P.In this example, the 1st and the 2nd angle Wa of peristome, its setting of Wb be make Wa-Wb be 360 °/LCM (P, N) * (4/3) ± 1 ° (9 °～11 °).
The permanent magnet rotary motor that this is routine, its 1 split core 13 has from the circumferential edge portions of the rotor 3 of magnetic pole strength formation portion 13c end to the outstanding protuberance 13d of rotor 3 peripheral side, this split core 13 is replaced opposite state (with the state of Rotate 180 °) with the inside and outside be combined in rotor 3 and circumferentially constitute stator cores 2.Thereby, 12 groove 9A～9L that form on the stator core 2, alternately formation belongs to the 1st groove group, has the groove that open angle is the 1st angle (9A, 9C, 9E, 9G, 9I, 9K) and belongs to the 2nd groove group, has the groove (9B, 9D, 9F, 9H, 9J, 9L) of open angle less than the 2nd angle of the 1st angle.Therefore, the position that has the groove (9A, 9C, 9E, 9G, 9I, 9K) of the 1st bigger angle at the open angle of peristome, the torque of rotor 3 is big, and having the position of the groove (9B, 9D, 9F, 9H, 9J, 9L) of the 2nd less angle at the open angle of peristome, the cogging torque of rotor 3 is little.Composite effect (effect multiplies each other) is being brought into play in the increase of this torque and the reduction of cogging torque, is keeping under the state of torque, can generally reduce cogging torque and torque pulsation across stator integral body.In addition, can adopt the steel plate 15 of a kind of shape is stacked and split core a kind of shape constituting constitutes stator core 2.
Fig. 2 is in the rotation of this routine permanent-magnet type, the value of angle changing difference Wa-Wb, and the relation of the value of investigation differential seat angle Wa-Wb and the value of cogging torque is represented its result's figure.According to Fig. 2 as can be known, if make the value of differential seat angle Wa-Wb be 9 °～11 °, promptly 360 °/LCM (P, N) * (4/3) ± 1 °, then can make cogging torque is minimum value below the 0.3Nm.
Fig. 3 is in the rotation of this routine permanent-magnet type, the value of angle changing difference Wa-Wb, and the relation of the value of investigation differential seat angle Wa-Wb and the value of torque is represented its result's figure.According to Fig. 3 as can be known, even the value of differential seat angle Wa-Wb is made many variations, torque does not almost change.
Fig. 4 is in the rotation of this routine permanent-magnet type, the value of angle changing difference Wa-Wb, and the relation of the value of investigation differential seat angle Wa-Wb and the value of torque pulsation is represented its result's figure.According to Fig. 4 as can be known, if making the value of differential seat angle Wa-Wb is 9 °～11 °, then can make torque pulsation is minimum value.
Fig. 5 is in the rotation of this routine permanent-magnet type, the value of angle changing difference Wa-Wb, and the relation of the value of the value of investigation differential seat angle Wa-Wb and the peaked relation of rotor eccentricity power and differential seat angle Wa-Wb and the mean value of rotor eccentricity power is represented its result's figure.According to Fig. 5 as can be known, even the value of differential seat angle Wa-Wb is made many variations, the maximum of rotor eccentricity power and mean value torque be not so big variation also.
Fig. 6 is used to illustrate the stator 101 of permanent magnet rotary motor of the 2nd execution mode of the present invention and the skeleton diagram of rotor 103.As shown in Figure 6, the stator core 102 of the stator 101 of the permanent magnet rotary motor that this is routine has 12 stator pole piece 107 and N (in this example being 12) iron core 109A～109L equally with the permanent magnet rotary motor of the 1st execution mode shown in Figure 1.Constitute 12 split core 113A～113L of stator core 102, constitute at the stacked a plurality of steel plates 115 of rotor 103 axis directions, possess the arcuation yoke formation 113a of portion, side-prominent and twine the winding wound portion 113b of excitation winding and be arranged on the magnetic pole strength formation 113c of portion of winding wound portion 113b end to rotor 3 from the substantial middle of the yoke formation 113a of portion.On each winding wound portion 113b, concentrate to twine excitation winding and constitute winding portion 111.Along the electric current that flows in 3 winding portions 111 of circumferential adjacent arrangement, with electrical degree every 120 ° of phase deviations.That is, the phase place along the electric current that flows in 12 winding portions 111 of circumferential array, become+U ,+V ,+W ,+U ,+V ,+order of W....The magnetic pole strength formation 113c of portion possesses from the circumferential two edge portions of rotor 103 to circumferential two of rotor 103 side-prominent the 1st and the 2nd protuberance 113d, 113e.The 1st protuberance 113d is littler to the outstanding size of rotor 103 peripheral side than the 2nd protuberance 113e.Thereby, thereby the peristome of 12 groove 109A～109L of stator core 102 alternately is formed with the 1st peristome 109a that is oppositely arranged the 1st protuberance 113d and is oppositely arranged the 2nd protuberance 113e opening size little 2nd peristome 109b more circumferential than the 1st peristome 109a rotor 103.In other words, then under the situation of this execution mode, the 1st protuberance 113d of split core (113A, 113C, 113E, 113G, 113I, 113K) that belongs to the 1st split core group is relative with the 1st protuberance 113d of the split core that belongs to the 2nd split core group (113B, 113D, 113F, 113H, 113J, 113L), forms the 1st peristome 109a with the 1st angle Wa of the groove (109A, 109C, 109E, 109G, 109I, 109K) that belongs to the 1st groove group between them.In addition, the 2nd protuberance 113e of split core (113A, 113C, 113E, 113G, 113I, 113K) that belongs to the 1st split core group is relative with the 2nd protuberance 113e of the split core that belongs to the 2nd split core group (113B, 113D, 113F, 113H, 113J, 113L), forms the 2nd peristome 109b with the 2nd angle Wb of the groove (109B, 109D, 109F, 109H, 109J, 109L) that belongs to the 2nd groove group between them.As mentioned above, the 1st protuberance 113d is littler to the outstanding size of rotor 103 peripheral side than the 2nd protuberance 113e, and therefore, the 2nd angle Wb is less than the 1st angle Wa.
Fig. 7 is in the rotation of this routine permanent-magnet type, and the angle of rotor the when value of the angle of rotor the when value of investigation differential seat angle Wa-Wb is 0 ° and the relation of cogging torque and differential seat angle Wa-Wb is 5 ° and the relation of cogging torque are represented its result's figure.According to Fig. 7 as can be known, when being 0 ° than differential seat angle Wa-Wb when the value of differential seat angle Wa-Wb is 5 °, can reduce the generating capacity of the cogging torque that changes with respect to angle of rotor.
Next, the least common multiple LCM of investigation P and N (P, N), the least common multiple LCM of 1/2 and the N of P (P/2, N) in the equal permanent magnet rotary motor, the value of differential seat angle Wa-Wb and the relation of cogging torque.More particularly, adopt the permanent magnet rotary motor of 10 utmost points, 12 grooves to test.In the permanent magnet rotary motor of 10 utmost points, 12 grooves, and the least common multiple LCM of P (10) and N (12) (P, N), least common multiple LCM (P/2, N) the numerical value (60) of 1/2 and the N (12) of P (5) for equating.In addition, in the permanent magnet rotary motor of 10 utmost points, 12 grooves, try to achieve 360 °/LCM (P, N) * value of (4/3) ± 1 ° is 7 °～9 °.When for this reason, the value of differential seat angle Wa-Wb of investigating the permanent magnet rotary motor of 10 utmost points, 12 grooves is 0 ° and 8 ° and the relation of cogging torque.Its result of table 1 expression.
[table 1]
| Wa-Wb(°) | Cogging torque (N.m) |
| 0 | 0.05 |
| 8 | 0.40 |
According to table 1 as can be known, the value of differential seat angle Wa-Wb is that cogging torque was big when 8 ° of times, ratio was 0 °.Like this, and the least common multiple LCM of P and N (P, N), (P/2 N) in the equal permanent magnet rotary motor, can not be suitable for the present invention for the least common multiple LCM of 1/2 and the N of P.
Next, adopt this example (embodiment) permanent magnet rotary motor and along the current phase that flows in per 2 winding portions of circumferential array, every 120 ° of phase deviations and according to+U ,+U ,+V ,+V ,+W ,+sequence offsets of W... and the permanent magnet rotary motor that other and this routine permanent magnet rotary motor has the comparative example of same structure, investigate the relation of angle of rotor and torque and torque pulsation.Fig. 8 represents its measurement result.According to Fig. 8 as can be known, the permanent magnet of embodiment rotation rotation motor is compared with the permanent magnet rotary motor of comparative example, and torque can raise.In addition, amplitude A 1, A2 and the embodiment of each characteristic line and the torque pulsation of comparative example are proportional, and therefore, according to Fig. 8 as can be known, the permanent magnet rotary motor of embodiment is compared with the permanent magnet rotary motor of comparative example, can reduce torque pulsation.
Claims (8)
1. a permanent magnet rotary motor has rotor and stator,
Above-mentioned rotor comprises rotor core and is installed in P the rotor magnetic pole department that is made of permanent magnet on this rotor core, and an above-mentioned P rotor magnetic pole department is configured in making progress in week of above-mentioned rotor core with the angle intervals of 360 °/P, and wherein P is the natural even number more than 4;
Said stator, comprise stator core and N winding portion, the said stator core, comprise opposed and have N stator pole piece of the magnetic pole strength that above-mentioned circumferential lengths equates and have N groove towards the peristome of above-mentioned rotor core opening with above-mentioned rotor core, an above-mentioned N stator pole piece and an above-mentioned N groove replace alignment arrangements above-mentioned circumferential with the angle intervals of 360 °/2N, wherein N is 6 multiple, above-mentioned N winding portion concentrate to twine excitation winding respectively and constitutes in an above-mentioned N stator pole piece;
Above-mentioned P and above-mentioned N constitute: and the least common multiple LCM of above-mentioned P and above-mentioned N (P, N), least common multiple LCM (P/2, N) difference of 1/2 and the above-mentioned N of above-mentioned P;
Along the electric current that flows in the above-mentioned winding of 3 of the above-mentioned circumferential adjacent arrangement portion, by the phase deviation of electrical degree every 120 °; This permanent magnet rotary motor is characterized in that:
An above-mentioned N groove is grouped into along the open angle of the above-mentioned above-mentioned peristome that circumferentially records, and to be N/2 the groove of formation the 1st groove group of the 1st angle and above-mentioned open angle be N/2 groove less than formation the 2nd groove group of the 2nd angle of the 1st angle;
Constitute the said stator core by N/2 the split core that belongs to the 1st split core group with N/2 the split core that belongs to the 2nd split core group;
Said stator core, its formation are that the above-mentioned split core that belongs to above-mentioned the 1st split core group replaces alignment arrangements above-mentioned circumferential with the above-mentioned split core that belongs to above-mentioned the 2nd split core group;
Be configured in the above-mentioned split core of belonging to of 1 above-mentioned groove both sides of above-mentioned the 1st split core group and the above-mentioned split core that belongs to above-mentioned the 2nd split core group, with axis by the above-mentioned rotor center shape of cross section of the direction of quadrature mutually, form shape with respect to the imaginary line line symmetry of center by the above-mentioned peristome of above-mentioned groove and above-mentioned rotor axis; Its result, the above-mentioned groove that belongs to above-mentioned the 1st groove group is arranged alternately in above-mentioned week upwards with the above-mentioned groove that belongs to above-mentioned the 2nd groove group.
2. permanent magnet rotary motor according to claim 1 is characterized in that: the differential seat angle of above-mentioned the 1st angle and above-mentioned the 2nd angle is [360 °/LCM (P, N)] * (4/3) ± 1 degree.
3. permanent magnet rotary motor according to claim 2, it is characterized in that: above-mentioned split core comprises: arcuation yoke formation portion, from the substantial middle of above-mentioned yoke formation portion to above-mentioned rotor-side outstanding and twine above-mentioned excitation winding the winding wound portion, be wholely set magnetic pole strength formation portion at above-mentioned winding wound portion front end;
Above-mentioned magnetic pole strength formation portion possesses 1 protuberance that extends along above-mentioned yoke formation portion;
The above-mentioned magnetic pole strength formation portion end that above-mentioned protuberance is not set that the above-mentioned magnetic pole strength formation portion end of above-mentioned protuberance and the above-mentioned split core that belongs to above-mentioned the 2nd split core group are not set of above-mentioned split core that belongs to above-mentioned the 1st split core group is relative, forms the above-mentioned peristome with above-mentioned the 1st angle of the above-mentioned groove that belongs to above-mentioned the 1st groove group between them;
The above-mentioned protuberance of above-mentioned split core that belongs to above-mentioned the 1st split core group is relative with the above-mentioned protuberance of the above-mentioned split core that belongs to above-mentioned the 2nd split core group, forms the above-mentioned peristome with above-mentioned the 2nd angle of the above-mentioned groove that belongs to above-mentioned the 2nd groove group between them.
4. permanent magnet rotary motor according to claim 2, it is characterized in that: above-mentioned split core comprises: arcuation yoke formation portion, from the substantial middle of above-mentioned yoke formation portion to above-mentioned rotor-side outstanding and twine above-mentioned excitation winding the winding wound portion, be wholely set magnetic pole strength formation portion at above-mentioned winding wound portion front end;
Above-mentioned magnetic pole strength formation portion possesses along yoke formation portion and extends and respectively to above-mentioned circumferential two side-prominent the 1st and the 2nd different protuberances of outstanding size;
Above-mentioned the 1st protuberance that belongs to above-mentioned the 1st protuberance of above-mentioned split core of above-mentioned the 1st split core group and the above-mentioned split core that belongs to above-mentioned the 2nd split core group is relative, forms the above-mentioned peristome with above-mentioned the 1st angle of the above-mentioned groove that belongs to above-mentioned the 1st groove group between them;
Above-mentioned the 2nd protuberance that belongs to above-mentioned the 2nd protuberance of above-mentioned split core of above-mentioned the 1st split core group and the above-mentioned split core that belongs to above-mentioned the 2nd split core group is relative, forms the above-mentioned peristome with above-mentioned the 2nd angle of the above-mentioned groove that belongs to above-mentioned the 2nd groove group between them.
5. permanent magnet rotary motor according to claim 1, it is characterized in that: an above-mentioned P rotor magnetic pole department is embedded in above-mentioned rotor core inside, and the outer peripheral face part corresponding with above-mentioned rotor magnetic pole department of above-mentioned rotor core is crooked and outstanding to the diametric(al) outside.
6. permanent magnet rotary motor according to claim 5 is characterized in that: above-mentioned P is 16, and above-mentioned N is 12.
7. permanent magnet rotary motor according to claim 1 is characterized in that: an above-mentioned P rotor magnetic pole department is installed in above-mentioned rotor core outer peripheral face.
8. permanent magnet rotary motor according to claim 7 is characterized in that: above-mentioned P is 8, and above-mentioned N is 12.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2004237031 | 2004-08-17 | ||
| JP2004237031 | 2004-08-17 | ||
| JP2004354612 | 2004-12-07 |
Publications (2)
| Publication Number | Publication Date |
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| CN1738166A CN1738166A (en) | 2006-02-22 |
| CN100581029C true CN100581029C (en) | 2010-01-13 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN200510091741A Expired - Fee Related CN100581029C (en) | 2004-08-17 | 2005-08-17 | Permanent magnet rotary motor |
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Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1933286B (en) * | 2006-08-29 | 2012-05-23 | 林祥钟 | Permanent magnetic brushless DC four-quadrant electric machine |
| CN102738930B (en) * | 2007-11-28 | 2014-10-01 | 阿斯莫有限公司 | embedded magnet type motor |
| CN104682649B (en) * | 2009-06-01 | 2018-07-03 | 德昌电机(深圳)有限公司 | Motor and its excitation part |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1215801A2 (en) * | 2000-12-14 | 2002-06-19 | Nissan Motor Co., Ltd. | Rotating electric machine and method of manufacture therefor |
| CN1503438A (en) * | 2002-11-20 | 2004-06-09 | ���α�����ʽ���� | Rotary solenoid |
| CN1508938A (en) * | 2002-12-19 | 2004-06-30 | 松下电器产业株式会社 | Motor |
| JP3672919B1 (en) * | 2004-08-17 | 2005-07-20 | 山洋電気株式会社 | Permanent magnet type rotary motor |
-
2005
- 2005-08-17 CN CN200510091741A patent/CN100581029C/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1215801A2 (en) * | 2000-12-14 | 2002-06-19 | Nissan Motor Co., Ltd. | Rotating electric machine and method of manufacture therefor |
| CN1503438A (en) * | 2002-11-20 | 2004-06-09 | ���α�����ʽ���� | Rotary solenoid |
| CN1508938A (en) * | 2002-12-19 | 2004-06-30 | 松下电器产业株式会社 | Motor |
| JP3672919B1 (en) * | 2004-08-17 | 2005-07-20 | 山洋電気株式会社 | Permanent magnet type rotary motor |
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| CN1738166A (en) | 2006-02-22 |
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