CN207150281U - P-m rotor and magneto - Google Patents

Abstract

A kind of p-m rotor is the utility model is related to, the p-m rotor includes the rotor core with outer peripheral surface.Formed with multiple magnet insertion holes being circumferentially spaced in rotor core.Each hole is respectively provided with the cross section of substantially elongated slits, and elongated slits are relative to outer circumferential surface curvature concavity.Elongated slits include radially inner side portion, radially outer side portions, the side portion being spaced apart respectively with outer peripheral surface by bridge and at least one recess from radially outer side portions extension.P-m rotor also includes the permanent magnet being inserted into each hole in the hole.At least one recess forms gap between permanent magnet and radially outer side portions, and a part for the end face of one or more permanent magnets directly contacts with bridge.The utility model further relates to a kind of magneto.

Description

P-m rotor and magneto

Technical field

It the utility model is related to p-m rotor and magneto.

Background technology

In motion types, it is known that permanent magnet synchronous motor has high power density and efficiency.More commonly in type One type is commonly known as inner permanent magnetic motor.The mixed of reluctance torque and permanent-magnet torque is produced because inner permanent magnetic motor has Conjunction ability, it is also referred to as permanent-magnet magnetic resistance motor.Including the permanent-magnet magnetic for the rotor core for being wherein embedded with one or more permanent magnets Hinder torque caused by the motor that torque caused by motor is arranged on rotor wicking surface higher than magnet.This damascene structures by It is positioned in permanent magnet in rotor core and produces extra reluctance torque to provide variable reluctance magnetic path in rotor core, also referred to as For saliency (saliency).

During operation, each magnet in embedded rotor core is subjected to centrifugal force.In order to keep magnet under centrifugal force In rotor core, --- it is referred to as bridge or bridge zone domain --- generally by the narrow section of rotor core material and is maintained at the end of magnetic pole Between the outer peripheral edge of rotor core.The centrifugal force acted on permanent magnet and the centrifugal force acted on rotor core concentrate on these In bridge.Therefore, the radial width of bridge is manufactured the sufficiently large mechanical strength required with maintenance.Difficult point in these motors exists In bridge portion is needed to be made thicker to meet requirement of mechanical strength, and cost is let out by the higher magnetic flux of bridge portion Leakage result in the generation compared with low torque.On the contrary, relatively thin bridge causes the reduction of rotor strength, so as to limit the speed of motor Energy.

Utility model content

The present disclosure describes being permanently embedded magnet type motor including rotor core, the rotor core has formed therein more Individual magnet insertion holes.Patchhole includes the recess positioned at magnet ends, and the recess is formed between air between magnet and rotor core Gap so that reduce the loss of the magnetic flux by bridge zone domain.

On the one hand, the technology is related to p-m rotor, and the p-m rotor includes：Rotor core, the rotor core are in generally cylindrical shape Shape simultaneously has outer peripheral surface and rotation axis；Multiple magnet insertion holes, the multiple magnet insertion holes are formed in rotor core And to arrange circumferentially around the rotational axis, each hole has the cross section of substantially elongated slits, wherein, elongated slits are relative to outer Peripheral surface bends concavity, and wherein, elongated slits include radially inner side portion, radially outer side portions, by bridge respectively with outside Peripheral surface at least one side portion spaced apart and at least one recess from radially outer side portions extension；And one or more Multiple permanent magnets, one or more permanent magnet are inserted into each hole in the hole, wherein, at least one recess Gap is formed between one or more permanent magnets and radially outer side portions, and wherein, the end of one or more permanent magnets The part in face directly contacts with bridge.

In one example, when rotor core rotates, caused centrifugal force passes through end on one or more permanent magnets Face is transferred to bridge.In another example, gap has be limited to one or more permanent magnets and recess and radially outer side portions The first distance between substantially vertical Part I, and gap has the limited substantially in parallel along radially outer side portions Two distances, and wherein, the first distance is more than second distance.In another example, one or more permanent magnets include thickness, and And wherein, the substantially whole thickness of end face directly contacts with bridge.In another example, recess is inside by radially outer part and footpath Portion part limits, wherein, radially outer part and radial inner portion are adjacent at least one side portion positioning.In an example In, at least one of radially outer part and radial inner portion include two or more angled sides.

In another example, it is at least one including curved side portions in radially outer part and radial inner portion.Another In one example, radially outer part and radial inner portion are arranged with the angle between about 10 ° to 80 °.In another example, Recess includes the turning of rounding.In one example, elongated slits are general U-shape, and three have trapezoidal cross-section Permanent magnet be inserted into it is in each hole in the hole and interlocked with one another during the rotation of rotor core.In another example, Rotor core is formed by integral type body.In another example, rotor core includes the multiple plates stacked along rotation axis, the plate In each plate be stamped or be cut to elongated slits.In another example, rotor core is more than the material of air by magnetic conductivity Material is made.

On the other hand, the technology is related to magneto, and the magneto includes：Stator, the stator include being coupled to power supply One or more coils；Rotor core, the rotor core are rotatably mounted in stator, wherein, rotor core is in big Cause cylindrical form and there is outer peripheral surface and rotation axis；Multiple magnet insertion holes, the multiple magnet insertion holes are formed To arrange in rotor core and circumferentially around the rotational axis, each hole has the cross section of substantially elongated slits, wherein, it is elongated narrow Relative to outer circumferential surface curvature concavity, and wherein, elongated slits include being adjacent to outer peripheral surface positioning at least seam One recess；And three permanent magnets, three permanent magnets are inserted into each hole in the hole.Three permanent magnet bags Include：Radial outer side；And at least one end face, at least one end face are spaced apart by bridge with outer peripheral surface respectively, its In, at least one recess forms gap between rotor core and radial outer side, wherein, a part at least one end face and institute State bridge directly to contact, and wherein, rotor core is configured to rotate around rotation axis when power supply is to coil with electric current.At one In example, motor includes permanent-magnet magnetic resistance motor.

By reading described in detail below and relevant drawings summaries, sign is described herein to be permanently embedded magnet type These features and various other features and advantage of motor will be apparent.Supplementary features illustrate in the following description, And it partly will become obvious according to specification, or can be understood by the practice of the technology.The benefit of the technology It will realize and obtain by the structure specifically noted in printed instructions, its claims and accompanying drawing with feature.

It should be appreciated that above-mentioned introduction and it is described in detail below be all exemplary and explanat, and be intended to provide to institute Claimed invention is explained further.

Brief description of the drawings

Formed the application a part the following drawings be the technology explanation be not intended to limit it is of the present utility model Scope claimed in any way, the scope of the utility model should be based on claims appended hereto.

Fig. 1 is the longitdinal cross-section diagram of exemplary permanent magnet electric motor.

Fig. 2 can be used for the stereogram of the exemplary rotor core in the motor shown in Fig. 1.

Fig. 3 is the transverse partial cross-sectional view of the motor shown in Fig. 1.

Fig. 4 is the detailed view of the exemplary permanent magnet shown in Fig. 3.

Fig. 5 is the detailed view of the exemplary permanent magnet patchhole shown in Fig. 3.

Fig. 6 is the detailed view of the exemplary recess of the patchhole shown in Fig. 5.

Embodiment

In being permanently embedded before formula magnet type motor is described to the theme as the disclosure, it will be appreciated that this public affairs Specific structure, processing step or the material being not limited to herein disclosed are opened, but expands to its equivalent, such as will be by phase Those of ordinary skill's accreditation in pass field.It is also understood that terminology employed herein is only used for describing particular implementation Purpose, and be not intended to limit.It must be noted that unless the context clearly determines otherwise, the otherwise list used in this specification Number form formula " one ", "one" and "the" include plural form.In addition, term as used herein " axial direction " and " axially " referring to It is roughly parallel to direction and the orientation of the center line extension of motor.In addition, term " radial direction " and " radially " referring to substantially vertical In the direction that the center line of motor extends and orientation.In addition, term as used herein " circumference " and " circumferentially " referring to around horse The direction extended and orientation the center line arc reached.

The present disclosure describes magnet type motor is permanently embedded, this, which is permanently embedded magnet type motor, includes being formed in rotor core Recess in magnet insertion holes.Recess from the end of magnet circumferentially direction between magnet and rotor core formed between air Gap.By including the air gap in rotor core, reduced by the loss of the magnetic flux in bridge zone domain so that the thickness in bridge zone domain can With increase.Which increase magnetic resistance so that the saliency of motor and the reluctance torque increase as caused by motor.In addition, reduce The flux leakage of other magnetic poles in rotor core, so as to allow more magnetic fluxs to be connected to stator and increase as caused by permanent magnet Torque.In addition, the stress on the domain of bridge zone reduces, this will allow motor to be run with higher speed.These advantages cause total motor Efficiency, power and torque density increase.

Fig. 1 is such as electronic along the exemplary permanent magnet electric motor of the direction interception of the rotation axis parallel to rotor core 102 The longitdinal cross-section diagram of motor 100.In this example, electro-motor 100 is interior permanent magnetism (IPM) motor, interior permanent magnetism (IPM) motor The type of the permanent magnet synchronous motor (PMSM) of permanent-magnet magnetic resistance (PMR) motor is also known as, electro-motor 100 includes stator core 104, rotor core 102 is disposed with stator core 104.Output shaft 106 is attached to rotor core 102 and along central rotation axis 108 Rotated with together with rotor core 102.Axle 106 is supported in stator core 104 in rotary manner by one or more bearings 110. Stator core 104 is in generally cylindrical shape and coil or winding including being attached to power supply (not shown), and the power supply is used to transport Between the departure date alternating current is provided to coil.

Fig. 2 can be used for the stereogram of the rotor core 102 in motor 100 (being shown in Fig. 1).With continued reference to Fig. 1, at this In example, rotor core 102 is in generally cylindrical shape, and with outer peripheral surface 112 and is attached to the opposite interior of output shaft 106 Perimeter surface 114.Rotor core 102 is formed with the multiple permanent magnets being circumferentially arranged around rotation axis 108 with default angle interval Patchhole 116.The cross section of patchhole 116 can be general U-shape and patchhole 116 along parallel to rotation axis 108 direction extension, so as to form the elongated slits of hollow shape.U-shape can be recessed relative to outer peripheral surface 112.

Rotor core 102 can be formed by single one-piece member or by being laminated multiple warps along rotation axis 108 Punching press or cleaved plate shape is into by being such as, but not limited to iron (Fe), silicon-iron (SiFe), Ni-Fe (NiFe), silicon-iron-cobalt (SiFeCo), the material of cobalt-iron (CoFe) and silicon-iron-phosphorus (SiFeP) is made, or multiple by being categorized as such as carbon steel, soft magnetism Any material of the electrical sheet of condensation material is made, or is made up of any other material of magnetic conductivity more than air.In this example, Rotor core 102 as needed or can be desired to have any amount of patchhole 116.In addition, rotor core 102 can be used for other The permanent magnet motor of suitable type.

In addition, permanent magnet 118 can be inserted into hole 116.The polarity of the permanent magnet 118 in adjacent hole 116 is arranged Into opposite each other.It should be noted that 12 magnetic poles are shown in Fig. 2 for illustrative purposes, but can be without departing from this religion Any other appropriate number of magnetic pole is used in the case of showing spirit.Patchhole 116 and permanent magnet 118 are carried out further below It is described in detail on ground.

Fig. 3 is the transverse partial cross-sectional view of motor 100.In this example, three permanent magnets 118a, 118b and 118c are inserted Enter into hole 116 to form permanent magnetism magnetic pole on rotor core 102.In alternative exemplary, three permanent magnets 118 can by with The integral type permanent magnet of substantially similar shape of cross section replaces with the shape of cross section in hole 116.Each permanent magnet 118 has rib Cylindrical shape, such as each magnet have the elongated shape for including generally trapezoidal cross section.Magnet 118 is along rotor core 102 The length of rotation axis 108 is identical with the length in hole 116.The cross section of magnet 118 is sized to so that three permanent magnetism Body 118 is fitted in hole 116 and is substantially filled with the whole space in hole 116.

Stator core 104 includes more with being circumferentially spaced of being formed of predetermined angle interval along the inner peripheral of stator core 104 Individual tooth 120.Coil 122 can be the three-phase windings wound around tooth 120, so as to make three-phase alternating current guiding pass through line Circle 122.In operation, rotor core 102 is due to flowing through the phase interaction between the electric current of coil 122 and the magnetic flux of permanent magnet 118 With and produce and rotated under permanent magnetic field torque.In addition, each permanent magnet 118 tends to relative to by flowing through coil 122 Magnetic field self poisoning caused by electric current makes rotor core 102 and axle 106 (being shown in Fig. 1) in minimum reluctance position, so as to produce The reluctance torque rotated relative to stator core 104.

Each patchhole 116 includes radially inner side portion 124, radially outer side portions 126 and the outer circumferential table with rotor core 102 The two sides portion 128,130 spaced apart of face 112.Rotor core 102 includes bridge 132, and bridge 132 is defined in the side portion in hole 116 128th, the region between 130 and outer peripheral surface 112.Bridge 132 has uneven radial thickness and including time bridge thickness (phase When in secondary bridge portion or thinner part) 134 and main bridge thickness (equivalent to main bridge portion or thicker portion) 136.Center pole portion What section (equivalent to central magnetic pole section or rotor center core section) 138 referred to rotor core 102 is circumferentially located at adjacent bridge 132 Between and the part that is located radially between the radially outer side portions 126 in hole 116 and the outer peripheral surface 112 of rotor core 102.Every Three permanent magnets 118 in individual hole 116 are arranged so that the center pole section 138 surrounded by three magnet faces and three permanent magnetism The polarity of body is identical.

Center pole section 138 is connected to the main central part 140 of rotor core 102 by bridge 132, so as to form rotor The whole body of core 102.The size of the outer peripheral surface 112 along rotor core 102 of patchhole 116 can be by rotor core 102 In the quantity of magnetic pole and two adjacent teeth 120 of stator core 104 between interval determine.When rotor core 102 rotates When, the centrifugal force acted on permanent magnet 118 is passed to bridge 132.The quality and rotor core of centrifugal force and permanent magnet 118 102 rotating speed square is directly proportional.Therefore, the thickness in hole 116 can be by the material of permanent magnet 118 and the rotating speed of rotor core 102 Magnetic flux density in the limit and center pole section 138 determines.

Magnet 118a to 118c cross section be designed such that during operation in hole 116 magnet with it is adjacent Permanent magnet is in close contact.For example, during operation under the exciting of centrifugal force or radial load, a central magnet 118b side It is in contact with left side outer magnet 118a side or is forced to contact.Similarly, under the exciting of centrifugal force, central magnet 118b's Another side is in contact with right side outer magnet 118c side or is forced to contact.Then, permanent magnet 118 is acted on during operation On centrifugal force by permanent magnet be transferred to bridge 132 positioned at those parts time between bridge portion 134 and main bridge portion 136.

However, the thickness of increase bridge 132 is so as to keep magnet 118, which increases pass through bridge zone domain during operation Flux loss, so as to reduce the efficiency of motor 100.Therefore, in this example, hole 116 includes being formed in rotor core 102 Two recesses 142,144.Radially outer side portions 126 of the recess 142,144 from each side portion 128,130 for being adjacent to hole 116 Extension, and airspace or gap as magnetic flux insulator are produced between magnet 118 and rotor core 102.This reduce to The flux leakage of other magnetic poles in rotor core 102, it is allowed to which more magnetic fluxs are connected to stator core 104, so as to increase by permanent magnetism Torque caused by body 118.In addition, via insulation recess 142,144 make magnetic flux shaping also reduce harmonic wave in rotor core 102 and Torque ripple, so as to reduce the noise of motor 100.Recess 142 and 144 is further described in detail below.

Further, since recess 142,144 is sized and shaped to reduce flux loss, then it can increase bridge 132 thickness to keep magnet 118 during operation.Outer magnet 118a, 118c are passed through along the direction of arrow 146 Centrifugal force major part Transmit evenly passes through bridge 132.Therefore, answering in time bridge portion 134 can be reduced by increasing the thickness of bridge 132 Power.Reduce the stress in time bridge portion 134 to make it possible to increase spinner velocity, so as to increase the output torque of motor 100.

Fig. 4 is the detailed view of permanent magnet 118.Fig. 5 is the detailed view of patchhole 116.Fig. 6 is recess 144 (in Fig. 5 Show) detailed view.Referring concurrently to Fig. 4 to Fig. 6, as described above, patchhole 116 is limited in rotor core 102 and is adjacent to Outer peripheral surface 112.Hole 116 is generally u-shaped shape, and including 126, two radially inner side portion 124, radially outer side portions sides Portion 128,130 and two recesses 142,144.The size and dimension of magnet 118 is configured to be contained in hole 116, and together Sample includes corresponding radially inner side face 148, radial outer side 150 and by bridge 132 and the outer peripheral surface with rotor core 102 112 two end faces 152,154 spaced apart.

Along the radially outer side portions 126 from patchhole 116, circumferentially outwardly direction extends recess 142,144.Therefore, Gap 156 is formed between a part for the radial outer side 150 of magnet 118 and rotor core 102.Therefore, the end face of magnet 118 152nd, 154 substantially entire surface directly contacts with bridge 132.In one example, hole 116 is in radially inner side portion 124 and radial direction Thickness 158 is limited between outside portion 126, and the side portion 128,130 of patchhole 116 extends generally the whole length of thickness 158 Degree so that the end face 152,154 of magnet 118 directly contacts with bridge 132.

In this example, recess 142,144 can include prolonging from the radially outer side portions 126 for being adjacent to side portion 128,130 The radially outer part 160 stretched and from the radially extending interior section 162 of radially outer side portions 126.Radially outer part 160 can With including curved side portions.In alternative exemplary, radially outer part 160 can include one or more angled sides.Radially Interior section 162 can also include curved side portions.In alternative exemplary, radial inner portion 162 can include one or more Individual angled sides.Radially outer part 160 can be relative to radial inner portion 162 with the angle between about 10 ° to 80 ° 164 positioning.In some instances, recess 142,144 includes the turning with radius.In alternative exemplary, recess 142,144 can To scan including more or less sections or more continuously arc.

In addition, in this example, gap 156 extends the first distance 166 from the radial outer side 150 of magnet 118 and prolonged Reach the radially outer part 160 substantially vertical with radial outer side 150 and extend in center pole section 138, and Gap 156 is roughly parallel to radial outer side 150 and extends second between radially outer part 160 and radial inner portion 162 Distance 168 so that the first distance 166 is more than second distance 168.In alternative exemplary, the first distance 166 can be less than or equal to Second distance 168.

It will be clear that system described herein is well adapted for realizing mentioned objects and advantages and wherein solid Some objects and advantages.It would be recognized by those skilled in the art that the system in this specification can be implemented in numerous ways, and because This is not limited by foregoing exemplary embodiment and example.Thus, different embodiments described herein is any The feature of quantity can be combined into a single embodiment, and having less than or more than all spies described herein The alternate embodiments of sign are possible., can be with although various embodiments have been described for purposes of this disclosure It is variously modified and retrofits in the scope desired by the disclosure completely.

Claims (15)

1. A kind of 1. p-m rotor, it is characterised in that including：

   Rotor core, the rotor core are in generally cylindrical shape, and including outer peripheral surface and rotation axis；

   Multiple magnet insertion holes, the multiple magnet insertion holes form in the rotor core and circumferential around the rotation axis Ground arranges that each hole has the cross section of substantially elongated slits, wherein, the elongated slits are curved relative to the outer peripheral surface Bent concavity, and wherein, the elongated slits include：

   Radially inner side portion；

   Radially outer side portions；

   At least one side portion, at least one one end side portion are not spaced apart by bridge with the outer peripheral surface；With

   At least one recess, the recess extend from the radially outer side portions；And

   One or more permanent magnets, one or more permanent magnet are inserted into each hole in the hole, wherein, At least one recess forms gap, and its at one or more between permanent magnet and the radially outer side portions In, a part for the end face of one or more of permanent magnets directly contacts with the bridge.
2. 2. p-m rotor according to claim 1, wherein, when the rotor core rotates, at one or more Caused centrifugal force is transferred to the bridge by the end face on permanent magnet.
3. 3. p-m rotor according to claim 1, wherein, the gap, which has, is limited to one or more permanent magnetism The first distance between body and the Part I substantially vertical with the radially outer side portions of the recess, and the gap has There is the second distance limited substantially in parallel along the radially outer side portions, and wherein, first distance is more than described the Two distances.
4. 4. p-m rotor according to claim 1, wherein, one or more permanent magnet includes thickness, and its In, the substantially whole thickness of the end face directly contacts with the bridge.
5. 5. p-m rotor according to claim 1, wherein, the recess with lower part by being limited：

   Radially outer part；And

   Radial inner portion, wherein, the radially outer part and the radial inner portion are adjacent at least one end Sidepiece positions.
6. 6. p-m rotor according to claim 5, wherein, in the radially outer part and the radial inner portion At least one includes two or more angled sides.
7. 7. p-m rotor according to claim 5, wherein, in the radially outer part and the radial inner portion At least one includes curved side portions.
8. 8. p-m rotor according to claim 5, wherein, the radially outer part is with the radial inner portion to be situated between Angle arrangement between about 10 ° to 80 °.
9. 9. p-m rotor according to claim 1, wherein, the recess includes the turning of rounding.
10. 10. p-m rotor according to claim 1, wherein, the elongated slits are generally u-shaped shape, and three tools The permanent magnet for having trapezoidal cross-section is inserted into each hole in the hole and interlocked with one another during the rotation of the rotor core.
11. 11. p-m rotor according to claim 1, wherein, the rotor core is formed by integral type body.
12. 12. p-m rotor according to claim 1, wherein, the rotor core includes what is stacked along the rotation axis Multiple plates, each plate in the plate are stamped or are cut to the elongated slits.
13. 13. p-m rotor according to claim 1, wherein, the material that the rotor core is more than air by magnetic conductivity is made.
14. A kind of 14. magneto, it is characterised in that including：

    Stator, the stator include one or more coils for being coupled to power supply；

    Rotor core, the rotor core are rotatably mounted in the stator, wherein, the rotor core is in generally cylindrical Shape, and there is outer peripheral surface and rotation axis；

    Multiple magnet insertion holes, the multiple magnet insertion holes form in the rotor core and circumferential around the rotation axis Ground arranges that each hole has the cross section of substantially elongated slits, wherein, the elongated slits are curved relative to the outer peripheral surface Bent concavity, and wherein, the elongated slits include being adjacent at least one recess of the outer peripheral surface positioning；And

    Three permanent magnets, three permanent magnets are inserted into each hole in the hole, wherein, three permanent magnet bags Include：

    Radial outer side；With

    At least one end face, at least one end face are spaced apart by bridge with the outer peripheral surface respectively, wherein, it is described extremely A few recess forms gap between the rotor core and the radial outer side, wherein, the one of at least one end face Part directly contacts with the bridge；And

    Wherein, the rotor core is configured to rotate around the rotation axis when the power supply is to the coil with electric current.
15. 15. magneto according to claim 14, wherein, the magneto includes permanent-magnet magnetic resistance motor.