CN102474142A - Permanent magnet type rotary electrical machine - Google Patents
Permanent magnet type rotary electrical machine Download PDFInfo
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- CN102474142A CN102474142A CN2010800299189A CN201080029918A CN102474142A CN 102474142 A CN102474142 A CN 102474142A CN 2010800299189 A CN2010800299189 A CN 2010800299189A CN 201080029918 A CN201080029918 A CN 201080029918A CN 102474142 A CN102474142 A CN 102474142A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K1/00—Details of the magnetic circuit
- H02K1/06—Details of the magnetic circuit characterised by the shape, form or construction
- H02K1/22—Rotating parts of the magnetic circuit
- H02K1/27—Rotor cores with permanent magnets
- H02K1/2706—Inner rotors
- H02K1/272—Inner rotors the magnetisation axis of the magnets being perpendicular to the rotor axis
- H02K1/274—Inner rotors the magnetisation axis of the magnets being perpendicular to the rotor axis the rotor consisting of two or more circumferentially positioned magnets
- H02K1/2753—Inner rotors the magnetisation axis of the magnets being perpendicular to the rotor axis the rotor consisting of two or more circumferentially positioned magnets the rotor consisting of magnets or groups of magnets arranged with alternating polarity
- H02K1/276—Magnets embedded in the magnetic core, e.g. interior permanent magnets [IPM]
- H02K1/2766—Magnets embedded in the magnetic core, e.g. interior permanent magnets [IPM] having a flux concentration effect
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- Permanent Field Magnets Of Synchronous Machinery (AREA)
Abstract
Disclosed is a permanent magnet type rotary electrical machine in which generation of leakage magnetic flux can be effectively suppressed, while centrifugal force intensity can be preserved. The electrical machine is equipped with a rotor (5) in which are embedded three permanent magnets (8a to 8c) for a single pole in the interior of a rotor core (6). The rotor (5) is rotatably arranged, with the provision of a rotation gap, on a stator comprising a stator coil accommodated in the interior of a slot. Magnet insertion holes, in which the permanent magnets (8a to 8c) are embedded, are provided in the rotor core (6) adjacent to one another in a substantially U-shaped formation directed towards the outer peripheral surface of the rotor (5). Cavities (9a1, 9a2, 9b1, 9b2, 9c1 and 9c2) are formed at the side faces of the permanent magnets (8a to 8c) which are embedded in the magnet insertion holes.
Description
Technical field
The present invention relates to electric rotating machines such as electric motor for vehicle, particularly relate to the structure of permanent magnet configuration at the rotor of the electric rotating machine of the inside of rotor.
Background technology
As with a kind of at the electric rotating machine of the inside of rotor of permanent magnet configuration, the motor (permanent magnet type motor) that is built-in with permanent magnet is arranged.This permanent magnet type motor is compared with widely used induction motor in various fields; Since be built in magnetic flux that the permanent magnet in the rotor produces and be establish and do not need exciting current; And the such electric current of induction motor does not circulate in rotor conductor; So secondary copper loss etc. can not take place, thereby be known as high efficiency motor.In the electric motor car that possesses electric motor for vehicle in the past since usability induction motor always, but in recent years, for the suitable of permanent magnet type synchro motor also studied in the simplification of the raising of seeking efficient, small-sized high outputization, cooling construction.
In addition; In permanent magnet type motor; The motor (SPMM:Surface Permanent Magnet Motor) that roughly is divided into the surperficial magnet structure that on the surface of rotor, sticks permanent magnet; With the motor (IPMM:Interior Permanent Magnet Motor) of imbedding the magnet structure with the inside of permanent magnetic baried rotor, but the permanent-magnet type magnetic resistance electric rotating machine shown in the for example following patent documentation 1 belongs to the latter.
This permanent-magnet type magnetic resistance electric rotating machine has in order to imbed to devices spaced apart 2 permanent magnets in a circumferential direction in extremely and the rotor that constitutes in the prominent utmost point portion that forms magnetic in the rotor core at each; An end that is each permanent magnet leans against the configuration that outer Monday of side, the other end lean against center one side partially partially; Thereby and the periphery of rotor core between form the tabs of thin-walled;, and the opening angle at the inner angle of 2 tabs that are configured to be formed by 2 permanent magnets is the electrical degree of regulation.
Patent documentation 1: the spy opens the 2007-97290 communique
But, almost all be that the inside of permanent magnetic baried rotor imbedded the magnet structure as the permanent magnet type motor of electric vehicle.
Specifically, in permanent magnet type motor, be the inside of the bigger rotor of 1～several kilograms permanent magnetic baried overall dimension (being radius) with each weight as electric vehicle, this rotor is with the rotary speed rotation of specified about 6000rpm.Therefore, in the motor of surperficial magnet structure, must extraly be provided for keeping securely the mechanism of permanent magnet, structurally have difficulty.Because this reason adopts mostly in the permanent magnet type motor of electric vehicle and imbeds the magnet structure.But, even imbed the permanent magnet type motor of magnet structure, the structure of the centrifugal force that also requires only to bear permanent magnet and produced with respect to rotor certainly.
On the other hand; In above-mentioned patent documentation 1 disclosed electric rotating machine; Owing to be permanent magnet with respect to the structure that only remains of centrifugal force by the strength maintenance that is in the rotor core on the rotor surface direction; So under the situation that the overall dimension of rotor increases, worry problem with respect to the insufficient strength of centrifugal force.Therefore; For example the permanent magnet type motor shown in the patent documentation 1 is being applicable under the situation in the electric motor car; Then produce the necessity of permanent magnet being inserted the inboard (central part one side) of rotor; Nowadays its result worries then that leakage flux on the both ends of permanent magnet increases and causes the problem of the reduction of driving torque.
Summary of the invention
The present invention proposes in view of the above problems, and its purpose is to provide a kind of permanent-magnet electric rotating machine, has both kept with respect to centrifugal intensity of force, has suppressed the generation of leakage flux again effectively.
Realize goal of the invention in order to address the above problem, permanent-magnet electric rotating machine involved in the present invention possesses: stator constitutes through the inside that stator winding is accommodated in stator slot; Rotor, have with said stator across the configuration in rotation space and can rotor rotated unshakable in one's determination, each imbeds the permanent magnet more than 3 in extremely in the inside of this rotor core; It is characterized in that, in above-mentioned rotor core, towards the outer peripheral face of rotor roughly U font ground alignment arrangements imbed the magnet insertion holes of above-mentioned permanent magnet, the side surface part of the permanent magnet in being embedded to above-mentioned each magnet insertion holes is formed with blank part.
According to permanent-magnet electric rotating machine involved in the present invention, have and both kept, by the effect that can suppress the generation of leakage flux effectively with respect to centrifugal intensity of force.
Description of drawings
Fig. 1 is the cutaway view of the related permanent magnet type motor of execution mode of the present invention 1;
Fig. 2 is the schematic sectional view of the structure of expression rotor shown in Figure 1;
Fig. 3 is the partial enlarged drawing that does not insert under the situation of permanent magnet;
Fig. 4 is the partial enlarged drawing that has inserted under the situation of permanent magnet;
Fig. 5 is the accompanying drawing of the influence that produces of the leakage flux of explanation permanent magnet;
Fig. 6 is the accompanying drawing of expression as the example in the past of comparison other;
Fig. 7 is in the past and the accompanying drawing of the maximum stress of relatively representing in the magnet insertion holes between the execution mode 1 to be produced;
Fig. 8 is the schematic sectional view of the structure of the related rotor core of expression execution mode of the present invention 2;
Fig. 9 is the schematic sectional view of the structure of the related rotor core of expression execution mode of the present invention 3;
Figure 10 is the accompanying drawing of effect of partial enlarged drawing and the execution mode 3 of explanation magnet insertion holes shown in Figure 9;
Figure 11 is the schematic sectional view of the structure of the related rotor core of expression execution mode of the present invention 4;
Figure 12 is the accompanying drawing of the variation of expression structure shown in Figure 11;
Figure 13 is the schematic sectional view of the structure of the related rotor core of expression execution mode of the present invention 5;
Figure 14 is the accompanying drawing of the maximum stress relatively representing in the magnet insertion holes in the past, between execution mode 1 and the execution mode 5 to be produced;
Figure 15 is the accompanying drawing of the variation of expression structure shown in Figure 13;
Figure 16 is the accompanying drawing of other variation of expression structure shown in Figure 13;
Figure 17 is the schematic sectional view of the structure of the related rotor core of expression execution mode of the present invention 6;
Figure 18 is the schematic sectional view of the structure of the related rotor core of expression execution mode of the present invention 7;
Figure 19 is the schematic sectional view of the structure of the related rotor core of expression execution mode of the present invention 8;
Figure 20 is the axial cutaway view that is in the permanent magnet of the facial side in both sides in the related permanent magnet of execution mode of the present invention 9;
Figure 21 is the axial cutaway view that is in the permanent magnet of central portion one side in the related permanent magnet of execution mode of the present invention 9.
Description of reference numerals:
1: permanent magnet type motor, 2: stator, 3: stator core, 3a: stator slot; 3b: stator tooth: 4: stator winding, 5: rotor, 6: rotor core, 7,7a～7c: magnet insertion holes; 8,8a～8m, 8a ', 8c ', 16,16a～16c: permanent magnet, 9,9a1,9a2,9b1,9b2,9c1,9c2: blank part, 10a, 10b, 11a, 11b: bridge part, 12: leakage flux; 13: magnetic flux, 14: contact-making surface, 15: core; 18: rotation space, 21a, 21c: dottle pin, 31a～31c: the thickness that plays magnetic direction.
Embodiment
Below, with reference to accompanying drawing the related permanent-magnet electric rotating machine of execution mode of the present invention is at length described.In addition, the present invention is limited the execution mode shown in following.
Fig. 1 is that Fig. 2 is the schematic sectional view of the structure of the rotor in the expression permanent magnet type motor shown in Figure 1 as the cutaway view of the permanent magnet type motor of an example of the related permanent-magnet electric rotating machine of execution mode of the present invention 1.And Fig. 3 and Fig. 4 are the enlarged drawings of the part that is illustrated by the broken lines in the rotor of Fig. 2, and Fig. 3 is the partial enlarged drawing that does not insert under the situation of permanent magnet, and Fig. 4 is the partial enlarged drawing that has inserted under the situation of permanent magnet.
At this, the configuration of magnet insertion holes 7 is as shown in Figure 3, has two magnet insertion holes 7a, 7c at the both ends of a magnet insertion holes 7b.And the group 7a of this magnet insertion holes 7～7c is as shown in Figure 2, towards roughly 6 groups of the U font ground configurations of the outer peripheral face of rotor 5.And as the permanent magnet 8a～8c of the group of the 1st permanent magnet formed magnetic flux towards magnetize (magnetization) on the direction of the outer peripheral face convergence of rotor 5; On the other hand, the permanent magnet 16a～16c of the group of adjacency (group of the 2nd permanent magnet) is in the magnetize on the direction of expanding towards the central part concentric circles ground of rotor 5 of magnetic flux.Promptly; In the rotor in the permanent magnet type motor of execution mode 1; Constitute alternatively arranging at magnetic flux that permanent magnet forms towards the permanent magnet crowd of magnetize on the direction of the outer peripheral face convergence of rotor with the permanent magnet crowd towards magnetize on the direction of centre of rotor portion concentric circles ground expansion of the magnetic flux that permanent magnet forms.
In addition, a magnetic direction that constitutes permanent magnet groups formation like this is for the induced voltage that makes stator winding is a sinusoidal wave shape, is then to be not limited in this in the sinuous purposes there is no need to make the induced voltage of stator winding.That is also can be towards the direction of the outer peripheral face of rotor or to play magnetic direction in each of each permanent magnet groups of magnetize on the direction of centre of rotor portion be parallel.
And; The both sides face of permanent magnet 8a～8c in imbedding magnet insertion holes 7a～7c is formed with blank part shown in Figure 49, and (face is formed with blank part 91a, 91b in the both sides of permanent magnet 8a; Face is formed with blank part 9b1,9b2 in the both sides of permanent magnet 8b, and face is formed with blank part 9c1,9c2 in the both sides of permanent magnet 8c).Effect about this blank part 9 is narrated afterwards.
In addition; In Fig. 1; Represented on the circumferencial direction of stator 2,36 stator slot 3a are arranged as an example with the isogonism spacing arrangement; On the circumferencial direction of rotor 5, imbed simultaneously the motor (each very 6 stator slots and each very 3 permanent magnets) of 6 utmost points of 18 permanent magnets 8, but the quantity of the quantity of the number of poles of motor, stator slot and permanent magnet etc. are not limited in the structure of Fig. 1, can be the selections of any amount.
Then, with reference to Fig. 4 and Fig. 5 the leakage flux of permanent magnet is described.In addition, Fig. 5 is the accompanying drawing of the influence that produces of the leakage flux of explanation permanent magnet 8.
The magnetic flux that permanent magnet 8a～8c produces returns rotor core 6 (not shown) once more after having passed the core 15 (with reference to Fig. 1) of stator core 3.But as shown in Figure 5, there is annular leakage flux 12 in the magnetic flux of a part not towards core 15 but be trapped in the inside of rotor core 6 to the rotor core 6 that permanent magnet 8 returns in.Because this leakage flux 12 can not help torque, and becomes the essential factor that iron loss increases, so preferably suppress as much as possible.
Therefore, as shown in Figure 4 about being configured to the roughly permanent magnet groups of U font in the rotor of this execution mode, the blank part of the facial side in both sides that makes magnet insertion holes 7 is greater than the blank part beyond the face of both sides.If through concrete structure; Then be to equate basically through the size of permanent magnet 8b being imbedded the blank part 9b1 that produces among the magnet insertion holes 7b and 9b2; Magnet insertion holes 7a is formed through permanent magnet 8a being imbedded among the blank part 9a1 that produces among the magnet insertion holes 7a and the 9a2 blank part 9a1 bigger, form through permanent magnet 8c being imbedded among the blank part 9c1 that forms among the magnet insertion holes 7c and the 9c2 blank part 9c2 magnet insertion holes 7c bigger.
Change mode and say, the shape of magnet insertion holes 7 is pre-formed to the blank part (for example blank part 9a1) of peripheral part one side that is formed on rotor core 6 is space greater than the blank part (for example blank part 9a2,9b1) of the central part that is formed on rotor core 6 one side.If according to the rotor core 6 that constitutes like this; Then be formed on the bridge part 10a between permanent magnet 8a, the 8b; Be formed on the bridge part 10b between permanent magnet 8b, the 8c, and be respectively formed at the magnetic flux path that bridge part 11a, 11b between the outer peripheral face of permanent magnet 8a, 8c and rotor core 6 becomes the leakage flux 12 that permanent magnet 8 forms.Therefore, through these magnetic flux paths of constriction, can reduce leakage flux.
At this, become the compromise proposal with centrifugal force intensity about bridge part 10a, 10b and 11a, 11b.But; In the rotor 5 of this execution mode, the number of permanent magnet is divided into 3, with the weight of the permanent magnet that reduces each; Make these 3 permanent magnets be arranged in roughly U font configuration simultaneously with as illustrating, having curvature; So compare, can make bridge part 10a, 10b and 11a, 11b thin-walled property, and the leakage flux through these bridge parts is reduced with structure in the past.
Then, with reference to Fig. 7 the effect of execution mode 1 is described.Fig. 7 is through relatively represented the accompanying drawing of the maximum stress that the magnetic flux patchhole is produced with execution mode 1 in the past.Among Fig. 7, be the value of having obtained the maximum stress that the magnetic flux patchhole at above-mentioned patent documentation 1 disclosed rotor produced through simulation as in the past example.In addition, the configuration structure of the permanent magnet of patent documentation 1 is as shown in Figure 6, and permanent magnet 108 is configured in the rotor core 106 with V-shape roughly.
As shown in Figure 7, be made as " 1 " if incite somebody to action the maximum stress of example in the past, then the maximum stress of execution mode 1 is 0.55, compares with example in the past to have 45% reduction effect.Therefore,, can either keep, can suppress the generation of leakage flux again effectively with respect to centrifugal intensity of force according to the rotor of execution mode 1.
And, according to the rotor of execution mode 1, because can be being further to seek slimming under certain condition with respect to centrifugal intensity of force, so leakage flux is further reduced.
Fig. 8 is the schematic sectional view of the structure of the related rotor core of expression execution mode of the present invention 2.In execution mode 1; Illustration for example be the example of the essentially rectangular shape of that kind shown in Figure 4 as the permanent magnet of imbedding in the magnet insertion holes 7; But 8 of the permanent magnets of execution mode 2 are as shown in Figure 8, and chamfering has been carried out in the bight of outer peripheral face one side of the permanent magnet 8a ' that is positioned at both end sides in 3 permanent magnets, 8c '.
Usually, produce under the situation of rotor torque never illustrated magnetic flux that roughly flows into 13 and permanent magnet 8 (Fig. 8 is permanent magnet the 8a ') interlinkage that is arranged in outermost perimembranous one side of rotor core 6 at motor.At this moment and since the magnetic flux 13 of interlinkage be with the magnetize of permanent magnet 8a ' in the opposite direction towards, so permanent magnet 8 demagnetizations, the torque reduction.Its result, with respect to the rotor torque of the part in the bight that is in permanent magnet 8a ' to help degree little.Therefore,, then can either suppress the reduction of rotor torque, the weight of permanent magnet is reduced effectively if chamfering is carried out in the bight of the permanent magnet 8 of outermost perimembranous one side that is positioned at rotor core 6.
And, when magnetic flux passes through, because vortex flow is mobile at the position of passing through, so the eddy current loss that permanent magnet is produced through above-mentioned chamfering reduces.
And; In this execution mode; Owing to only chamfering is carried out in the bight of the permanent magnet 8 of outermost perimembranous one side that is positioned at rotor core 6, keep the shape of execution mode 1 to the magnet insertion holes 7 that is used for inserting permanent magnet 8, so can keep and the effect that reduces the execution mode of leakage flux.
Fig. 9 is the schematic sectional view of the structure of the related rotor core of expression execution mode of the present invention 3, and Figure 10 is the accompanying drawing of effect of part enlarged drawing and the execution mode 3 of explanation magnet insertion holes shown in Figure 9.In execution mode 3, shown in Figure 10 (a), Figure 10 (b), conduct is handled with the asperities that carry out on the surface of the contact-making surface 14 of the part of the contact-making surface of permanent magnet 8 in the magnet insertion holes 7.Through the structure of this contact-making surface 14, according to the permanent magnet 8 and the frictional force that contacting of contact-making surface 14 obtains imbedded in the magnet insertion holes 7, can access the friction confining force that overcomes the centrifugal force that permanent magnet 8 produced, the maintenance of permanent magnet is easy.
Figure 11 is the schematic sectional view of the structure of the related rotor core of expression execution mode of the present invention 4.In execution mode 1; Illustration for example be the example of essentially rectangular shape shown in Figure 4 as the permanent magnet of imbedding in the magnet insertion holes 78; But then shown in figure 11 in execution mode 4, be suitable for the roughly permanent magnet of trapezoidal shape as the permanent magnet 8d that is positioned at central portion in 3 permanent magnets.In addition, mean on the permanent magnet 8 that at this said roughly trapezoidal shape contact-making surface with magnet insertion holes 7 is that the width of taper ground central part one side is bigger than peripheral part one side.
Usually, when high speed rotating and under the big situation of the external diameter of rotor, centrifugal force also increases.Therefore, hope to improve the confining force of the permanent magnet of the central portion of embodiment of centrifugal force with having the greatest impact.Therefore; Shown in figure 11, if make the roughly trapezoidal shape that is shaped as of the permanent magnet 8d that is positioned at central portion, then permanent magnet 8d imbeds in the magnet insertion holes 7 with wedge-like; Can obtain overcoming the power of centrifugal force through the structure of rotor core 6, the maintenance of permanent magnet is easy.
In addition; In Figure 11, illustration only make the permanent magnet that is positioned at central portion in 3 permanent magnets be the structure of trapezoidal shape roughly, but consider the productivity of permanent magnet; Preferably shown in figure 12, the permanent magnet 8f, 8f that also makes both ends is trapezoidal shape roughly in the lump.Through making all permanent magnets be trapezoidal shape roughly, can improve the anti-centrifugal force intensity of the bridge part (with reference to Fig. 4) between bridge part (with reference to Fig. 4) that is formed between each permanent magnet and the outer peripheral face that is formed on each both ends permanent magnet and rotor core 6.Its result can further reduce the area (volume) of above-mentioned two bridge parts, and leakage flux and iron loss are further reduced.
Figure 13 is the schematic sectional view of the structure of the related rotor core of expression execution mode of the present invention 5.In execution mode 1; Illustration that kind for example shown in Figure 4 each have the structure of the rotor core of 3 permanent magnets; But it is then shown in figure 13 in the rotor core of execution mode 5; Illustration to make the permanent magnet that is positioned at central portion be permanent magnet 8h, the 8i of the two essentially rectangular shapes cut apart, have the structure of the rotor core of 4 permanent magnets with permanent magnet 8a, the 8c of the essentially rectangular shape that is positioned at both end sides.
Figure 14 is the accompanying drawing of the maximum stress relatively representing magnet insertion holes in the past, between execution mode 1 and the execution mode 5 and produced.In Figure 14, example in the past and execution mode 1 all with shown in Figure 7 identical.
Shown in figure 14, be made as " 1 " if incite somebody to action the maximum stress of example in the past, then the maximum stress of execution mode 5 is 0.45, compares with example in the past to have and reduces by 55% effect.And, compare the effect that also has reduction by 20% weak (1-(0.45/0.55) ≈ 0.19) with execution mode 1.Therefore, as if rotor, then both kept the effect of the generation of the further inhibition leakage flux of having got back with respect to centrifugal intensity of force according to execution mode 5.
In addition; In execution mode 5; Illustration to make the permanent magnet that is positioned at central portion be the two permanent magnet 8h, 8i cut apart and be the example of essentially rectangular shape shown in Figure 13, but also can as among Figure 15 as that kind shown in permanent magnet 8j, the 8k, the contact-making surface that makes permanent magnet one side that is positioned at both ends is the roughly trapezoidal shape of taper; And, also can as Figure 11, make other contact-making surface also be the roughly trapezoidal shape of taper.
And; In execution mode 5; As the permanent magnet 8a that is positioned at both ends, 8c illustration the example of essentially rectangular shape of that kind shown in Figure 13, but also can as among Figure 16 as making permanent magnet 8l, the 8m permanent magnet that is positioned at both ends also be trapezoidal shape roughly.
And, in execution mode 5, illustration make the permanent magnet that is positioned at central portion be two cut apart each have the structure of the rotor core of 4 permanent magnets, but can certainly change the size of the permanent magnet that is positioned at both ends.
And, in execution mode 5, illustration each have the structure of the rotor core of 4 permanent magnets, but can certainly be each structure that has 5 above permanent magnets.
Figure 17 is the schematic sectional view of the structure of the related rotor core of expression execution mode of the present invention 6.In execution mode 1; As magnet insertion holes 7a～7c; Fig. 3, shown in Figure 4 for example; Permanent magnet 8a～8c is being inserted under the situation among magnet insertion holes 7a～7c separately example not only facial, also be formed with blank part at the both sides face that is arranged in the magnet insertion holes of central portion (example at Fig. 3, Fig. 4 is magnet insertion holes 7b) in the both sides that are arranged in 2 magnet insertion holes at both ends (example at Fig. 3, Fig. 4 is magnet insertion holes 7a, 7c).On the other hand, shown in figure 17 in execution mode 6, illustration the facial example that forms blank part only in the both sides that are positioned at 2 magnet insertion holes 7a at both ends, 7c.
In execution mode 4; Be positioned at the influence that the central portion permanent magnet manifests centrifugal force biglyyer and be illustrated for comparing with the permanent magnet that is positioned at both ends, illustration make the roughly example (with reference to Figure 11) of trapezoidal shape that is shaped as of the permanent magnet that is positioned at central portion.On the other hand, in this embodiment, as stated, adopted only facially to form blank part, and face does not form the structure of blank part in the both sides of the magnet insertion holes 7b that is positioned at central portion in the both sides that are being positioned at 2 magnet insertion holes 7a at both ends, 7c.
Under the situation that blank part is not set, increase the effect of the confining force increase that has obtained permanent magnet owing to the contact area of permanent magnet and magnet insertion holes.On the other hand, be formed on the bridge part 10a between permanent magnet 8a, the 8b and be formed on the bridge part 1b expansion between permanent magnet 8b, the 8c, worry to increase through the leakage flux between bridge part 10a, the 10b.Therefore; In the structure of Figure 17; Owing to form greater than the blank part of Fig. 4 if will be formed on blank part 9a2,9c1 on the side surface part that the blank part of 2 magnet insertion holes 7a being arranged in both ends, 7c is formed on central portion one side; Then can reduce the width of bridge part 10a, 10b, so can suppress the increase of leakage flux.
In addition; In this execution mode; Represented will be only to be applicable to the example under the situation in the rotor core of execution mode 1 in the facial structure that forms blank part in the both sides that are positioned at 2 magnet insertion holes 7a at both ends, 7c; But also can be applicable in the rotor core shown in the execution mode 2～5, can access the effect same with this execution mode.
Figure 18 is the schematic sectional view of the structure of the related rotor core of expression execution mode of the present invention 7.In this execution mode, shown in figure 18, between these magnet insertion holes of magnet insertion holes 7a, 7c and insertion 7a at both ends, permanent magnet 8a, 8c among the 7c, be respectively equipped with dottle pin 21a, 21c keeps.In addition, as dottle pin 21a, 21c, nonmagnetic substance for the influence in the magnetic field that reduces rotor core place and preferably.
In execution mode 4,6, the influence that centrifugal force has been described is that the permanent magnet that is positioned at central portion manifests than the permanent magnet that is positioned at both ends biglyyer.On the other hand; Under the big situation (situation that radius of curvature is little) of the curvature of the curve of the magnet insertion holes 7a～7c of the roughly U font that links configuration permanent magnet 8a～8c; Increase as playing the difference of magnetic direction (with the direction of magnet length direction quadrature) among the permanent magnet 8a of the permanent magnet at both ends, the 8c, the laterally power of (length direction) is arranged in permanent magnet 8a, the last effect of 8c with the direction of centrifugal force.In addition, because it is roughly consistent with the direction of centrifugal force in the permanent magnet 8b as the permanent magnet of central portion, to play magnetic direction, so the horizontal power that acts on the permanent magnet 8b is little.
Shown in figure 18; If owing between magnet insertion holes 7a, 7c and permanent magnet 8a, 8c, dottle pin 21a, 21c are set respectively; The centrifugal force that then can suppress to act on the length direction through the frictional force of permanent magnet 8a, 8c and dottle pin 21a, 21c is so the maintenance of permanent magnet is easy.
Figure 19 is the schematic sectional view of the structure of the related rotor core of expression execution mode of the present invention 8.In Figure 19; Be attached to the last unidirectional arrow line of permanent magnet 8a～8c and represent the magnetic direction that rises separately, the thickness 31b that plays magnetic direction of permanent magnet 8b that is in central portion is than thickness 31a, the 31b little (approaching) of the magnetic direction of the permanent magnet 8a that is in two sides one side, 8c.At this, under the situation big from the magnetic flux (not shown) of stator 2, magnetic flux is at the end interlinkage near the permanent magnet of the side of rotor surface.And, more little because the thickness that plays magnetic direction of permanent magnet is more little from the reluctance force of the magnetic flux of stator, so the easy demagnetization of permanent magnet.But, as permanent magnet 9b under the situation of the distance of rotor surface, be not easy to arrive from the magnetic flux of stator 2.Therefore, the permanent magnet 8b that is in central portion is not easy demagnetization, can reduce the thickness that plays magnetic direction of (attenuate) permanent magnet 9b.
In addition, also attenuate is not in the thickness that plays magnetic direction of the permanent magnet 9b of central portion, and is the permanent magnet of coercive force less than the coercive force that is in the facial permanent magnet 9a in both sides, 9b.Usually, improve the coercive force of permanent magnet more, relict flux density is more little, if reduce coercive force, then can increase relict flux density.Therefore, if adopt the magnet structure of execution mode 8, then can realize the lightweight that rotor axial shortens.And, because the unit price of permanent magnet has the cheap more tendency of the more little price of coercive force, thus can realize the cost degradation of rotor, and then realize the cost degradation of electric rotating machine.
Execution mode 9
Figure 20, the 21st, the axial cutaway view of the permanent magnet that execution mode of the present invention 9 is related; Figure 20 representes to be in the cross-sectional configuration of rotor axial of permanent magnet 8a, the 8c of two sides one side, and Figure 21 representes to be in the cross-sectional configuration of rotor axial of the permanent magnet 8b of central portion one side.It is shown in figure 20 that the magnet that is in permanent magnet 8a, the 8c of two sides one side is cut apart number, is 10 for example, be in central portion one side permanent magnet 8b to cut apart number shown in figure 21, for example be 5.This difference is because relevant with the eddy current loss of permanent magnet, has utilized through increasing that magnet is cut apart number and the cause of character that can reduce the eddy current loss of permanent magnet.
If describe in more detail; Then the eddy current loss owing to the permanent magnet that produces because of stator magnetic flux is bigger near permanent magnet 8a, the 8c of rotor surface; Cut apart number so need to increase magnet; But in the locational permanent magnet 8b that as permanent magnet 8b, is configured in away from rotor surface,, realize cost degradation so can reduce magnet to cut apart number because the magnet eddy current loss of stator magnetic flux reduces.
And, cut apart at distributed magnet under the situation of the different permanent magnet of number, preferably shown in figure 19, make the magnet shape of permanent magnet 8a (8) different in advance with the magnet shape of permanent magnet 8b.Under the situation of magnet being cut apart the few facial side in permanent magnet insertion both sides of number, the possibility that exists eddy current loss to increase.On the other hand,, make under the situation about varying in size of permanent magnet 8a (8c) and permanent magnet 8b shown in figure 19 and since eliminated with its misplug into possibility, can seek the effect that rate of finished products improves so have.
As stated, the present invention is as both having kept with respect to centrifugal intensity of force, and the permanent-magnet electric rotating machine and the rotor thereof that have suppressed the generation of leakage flux again effectively are useful.
Claims (13)
1. permanent-magnet electric rotating machine, possess: stator constitutes through the inside that stator winding is accommodated in stator slot; Rotor, have with said stator across rotation space ground configuration and can rotor rotated unshakable in one's determination, each imbeds the permanent magnet more than 3 in extremely in the inside of this rotor core; It is characterized in that,
In above-mentioned rotor core; Towards the outer peripheral face of rotor roughly U font ground alignment arrangements imbed the magnet insertion holes of above-mentioned permanent magnet, face is formed with blank part in the both sides of 2 permanent magnets to be embedded to each utmost point of outermost perimembranous one side that is positioned at above-mentioned rotor core in the permanent magnet in above-mentioned each magnet insertion holes at least.
2. permanent-magnet electric rotating machine as claimed in claim 1 is characterized in that, also is formed with blank part at the both sides face of the permanent magnet of the central portion that is positioned at above-mentioned rotor core one side.
3. permanent-magnet electric rotating machine as claimed in claim 2; It is characterized in that; Above-mentioned rotor core be towards the group of the 1st permanent magnet of magnetize on the direction of the outer peripheral face of above-mentioned rotor convergence and on the direction of above-mentioned centre of rotor portion concentric circles ground expansion the group of the 2nd permanent magnet of magnetize alternatively arrange.
4. permanent-magnet electric rotating machine as claimed in claim 2 is characterized in that, the size of above-mentioned magnet insertion holes is to be positioned at the size of magnet insertion holes of outermost perimembranous one side of above-mentioned rotor core greater than other magnet insertion holes.
5. permanent-magnet electric rotating machine as claimed in claim 2; It is characterized in that; In 2 magnet insertion holes of each utmost point of outermost perimembranous one side that is arranged in above-mentioned rotor core, with in permanent magnetic baried these magnet insertion holes the time and the size of the blank part that forms is to be positioned at the blank part of peripheral part one side greater than the blank part that is formed on central part one side.
6. permanent-magnet electric rotating machine as claimed in claim 2 is characterized in that, chamfering has been carried out in the bight of outer peripheral face one side of 2 permanent magnets of each utmost point that is positioned at outermost perimembranous one side of above-mentioned rotor core.
7. permanent-magnet electric rotating machine as claimed in claim 2 is characterized in that the part of the contact-making surface of above-mentioned magnet insertion holes and above-mentioned permanent magnet has been carried out the asperities processing.
8. permanent-magnet electric rotating machine as claimed in claim 2 is characterized in that, above-mentioned permanent magnet is to be the taper towards the central part width expansion of above-mentioned rotor core with the contact-making surface of above-mentioned permanent magnet patchhole.
9. permanent-magnet electric rotating machine as claimed in claim 2 is characterized in that, 2 permanent magnets of each utmost point that are positioned at outermost perimembranous one side of above-mentioned rotor core are fixed by the dottle pin of non-magnetic part.
10. permanent-magnet electric rotating machine as claimed in claim 2; It is characterized in that the thickness of the direction of magnetization of permanent magnet of central portion one side that is positioned at above-mentioned rotor core is than the thin thickness of the direction of magnetization of the permanent magnet of outermost perimembranous one side that is positioned at above-mentioned rotor core.
11., it is characterized in that the confining force of permanent magnet of central portion one side that is positioned at above-mentioned rotor core is littler than the confining force of the permanent magnet of outermost perimembranous one side that is positioned at above-mentioned rotor core like claim 2 or 10 described permanent-magnet electric rotating machines.
12. permanent-magnet electric rotating machine as claimed in claim 2 is characterized in that, above-mentioned each permanent magnet above-mentioned rotor axially on cut apart.
13. permanent-magnet electric rotating machine as claimed in claim 12 is characterized in that, the number of cutting apart of permanent magnet that is positioned at central portion one side of above-mentioned rotor core lacks than the number of cutting apart of the permanent magnet of outermost perimembranous one side that is positioned at above-mentioned rotor core.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JPPCT/JP2009/062207 | 2009-07-03 | ||
| PCT/JP2009/062207 WO2011001533A1 (en) | 2009-07-03 | 2009-07-03 | Permanent magnetic rotating electric machine |
| PCT/JP2010/061206 WO2011002043A1 (en) | 2009-07-03 | 2010-06-30 | Permanent magnet type rotary electrical machine |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN102474142A true CN102474142A (en) | 2012-05-23 |
Family
ID=43410631
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2010800299189A Pending CN102474142A (en) | 2009-07-03 | 2010-06-30 | Permanent magnet type rotary electrical machine |
Country Status (3)
| Country | Link |
|---|---|
| JP (1) | JPWO2011002043A1 (en) |
| CN (1) | CN102474142A (en) |
| WO (2) | WO2011001533A1 (en) |
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Also Published As
| Publication number | Publication date |
|---|---|
| WO2011001533A1 (en) | 2011-01-06 |
| JPWO2011002043A1 (en) | 2012-12-13 |
| WO2011002043A1 (en) | 2011-01-06 |
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Application publication date: 20120523 |