WO2022160781A1 - Ensemble rotor et moteur à réluctance synchrone à aimant permanent à démarrage automatique - Google Patents

Ensemble rotor et moteur à réluctance synchrone à aimant permanent à démarrage automatique Download PDF

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Publication number
WO2022160781A1
WO2022160781A1 PCT/CN2021/124324 CN2021124324W WO2022160781A1 WO 2022160781 A1 WO2022160781 A1 WO 2022160781A1 CN 2021124324 W CN2021124324 W CN 2021124324W WO 2022160781 A1 WO2022160781 A1 WO 2022160781A1
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WO
WIPO (PCT)
Prior art keywords
squirrel cage
axis
rotor assembly
slot
rotor
Prior art date
Application number
PCT/CN2021/124324
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English (en)
Chinese (zh)
Inventor
胡余生
陈彬
肖勇
史进飞
李霞
张志东
Original Assignee
珠海格力电器股份有限公司
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Publication of WO2022160781A1 publication Critical patent/WO2022160781A1/fr

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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
    • 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
    • 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
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K21/00—Synchronous motors having permanent magnets; Synchronous generators having permanent magnets
    • H02K21/02—Details
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K2213/00—Specific aspects, not otherwise provided for and not covered by codes H02K2201/00 - H02K2211/00
    • H02K2213/03—Machines characterised by numerical values, ranges, mathematical expressions or similar information

Definitions

  • the present application relates to the technical field of motors, and in particular to a rotor assembly and a self-starting permanent magnet synchronous reluctance motor.
  • the self-starting permanent magnet synchronous reluctance motor combines the structural characteristics of the induction motor and the synchronous permanent magnet reluctance motor.
  • the torque generated by squirrel cage induction realizes the starting, and the permanent magnet is realized by the rotor d and q axis magnetic flux difference and the torque generated by the permanent magnet.
  • Speed operation can be directly connected to the power supply to achieve start-up operation.
  • the self-starting permanent magnet synchronous reluctance motor can use the reluctance torque to increase the output torque of the motor.
  • the self-starting permanent magnet motor Compared with the self-starting permanent magnet motor, the amount of permanent magnets is reduced and the cost is reduced; compared with the asynchronous motor, the self-starting permanent magnet synchronous reluctance The motor is highly efficient, and the speed is constant and synchronized, and the speed does not change with the load.
  • the traditional permanent magnet motor and permanent magnet synchronous reluctance motor require a driver to start and control the operation, which is costly and complicated to control, and the driver occupies a part of the loss, which reduces the efficiency of the entire motor system.
  • the related art provides a controller-free self-starting permanent magnet assisted synchronous reluctance motor, which reduces the use of permanent magnet materials; however, the cast aluminum squirrel cage area is small, and the squirrel cage design is unreasonable, resulting in unbalanced squirrel cage resistance and the motor. The ability to start synchronization deteriorates.
  • the technical problem to be solved by the present application is to provide a rotor assembly and a self-starting permanent magnet synchronous reluctance motor, which can reduce the area difference of the squirrel cage slots, reduce the unbalance of squirrel cage resistance, and improve the starting synchronization ability of the motor.
  • the present application provides a rotor assembly including a rotor iron core, in a transverse section perpendicular to the central axis of the rotor iron core, each pole of the rotor iron core includes at least two layers of radially spaced installations The slot, the permanent magnet is installed in the installation slot, and the two ends of the installation slot are respectively provided with q-axis squirrel cage slots.
  • the direction length increases.
  • the q-axis squirrel cage grooves extend along the q-axis direction.
  • the mounting slots on the same layer and the q-axis squirrel cage slots at both ends together form a magnetic barrier layer.
  • the mounting slots, the q-axis squirrel cage slots, and the permanent magnets are symmetrically distributed with respect to the d-axis.
  • the length of the outer layer permanent magnet is greater than or equal to the length of the adjacent inner layer permanent magnet; and/or, along the radially outward direction, the outer layer permanent magnet
  • the width of the magnet is greater than or equal to the width of the adjacent inner layer permanent magnets.
  • the sum of the widths W of all permanent magnets under the same pole accounts for 0.15-0.45 times the effective radial width W1 of the rotor core, and the effective radial width W1 of the rotor core is the central shaft hole of the rotor core The radial width between the outer circle of the rotor core and the outer circle of the rotor core.
  • the permanent magnets are rare earth permanent magnets, 0.15 ⁇ W1 ⁇ W ⁇ 0.25 ⁇ W1; when the permanent magnets are ferrites, 0.25 ⁇ W1 ⁇ W ⁇ 0.45 ⁇ W1.
  • the width of the magnetic conduction channel between adjacent q-axis squirrel cage slots is W4, and the width of the magnetic conduction channel between the two installation slots corresponding to the adjacent q-axis squirrel cage slots is W5, where W4 ⁇ W5.
  • At least one side of at least part of the q-axis squirrel cage slot has a cut edge, and the cut edge is located at an end of the q-axis squirrel cage slot close to the outer circumference of the rotor.
  • the angle between the cut edge and the slot edge extension line of the q-axis squirrel cage slot corresponding to the cut edge is a, where 10° ⁇ a ⁇ 50°.
  • the rotor iron core is further provided with a d-axis squirrel cage slot, and the d-axis squirrel cage slot is located on a side of the radially outermost q-axis squirrel cage slot close to the d-axis.
  • the d-axis squirrel cage slots extend in a circumferential direction.
  • the q-axis squirrel cage slots and the d-axis squirrel cage slots are filled with conductive and non-magnetic materials.
  • both ends of the rotor core are provided with squirrel cage end rings, and the squirrel cage end rings cover all the squirrel cage slots and connect the squirrel cage slots to form a squirrel cage.
  • the total area of the q-axis squirrel cage slot and the d-axis squirrel cage slot is S1
  • the total area of all squirrel cage slots and all mounting slots is S, where S1 ⁇ 0.4 ⁇ S.
  • the cross-sectional shape of the q-axis squirrel cage slot and the mounting slot perpendicular to the central axis of the rotor core is a rectangle or a shape with a circular arc outline.
  • a self-starting permanent magnet synchronous reluctance motor which includes a rotor assembly, and the rotor assembly is the above-mentioned rotor assembly.
  • the self-starting permanent magnet synchronous reluctance motor further includes a stator, an air gap is formed between the stator and the rotor assembly, between the q-axis squirrel cage slot and the mounting slot, and between the q-axis squirrel cage slot and the outer circumference of the rotor It has a split rib, the width of the split rib is L6, and the radial width of the air gap is ⁇ , where 0.5 ⁇ L6 ⁇ 1.5 ⁇ .
  • the rotor assembly provided by the present application includes a rotor iron core.
  • each pole of the rotor iron core includes at least two layers of installation grooves arranged at intervals along the radial direction.
  • There are permanent magnets, q-axis squirrel cage slots are respectively provided at both ends of the installation slot, the width of the q-axis squirrel cage slot decreases along the direction close to the q-axis, and the length of the q-axis squirrel cage slot increases along the direction close to the q-axis.
  • the width of the q-axis squirrel cage groove decreases along the direction close to the q-axis, and the length of the q-axis squirrel cage groove increases along the direction close to the q-axis.
  • the area difference of each q-axis squirrel cage slot is reduced, the unbalance of squirrel cage resistance is reduced, the negative sequence asynchronous torque is further reduced, and the torque and pull-in torque during the motor starting process are increased, which is helpful for Improve motor starting ability.
  • FIG. 1 is a schematic structural diagram of a rotor assembly according to an embodiment of the application
  • FIG. 2 is a schematic structural diagram of a rotor assembly according to an embodiment of the application.
  • FIG. 3 is an axial view of a rotor assembly according to an embodiment of the application.
  • FIG. 4 is a schematic structural diagram of a rotor assembly according to an embodiment of the application.
  • Fig. 5 is the torque curve comparison diagram of the motor of the embodiment of the application and the motor in the related art
  • FIG. 6 is a graph showing the change of rotational speed with respect to time during the starting process of the motor according to the embodiment of the present application and the motor in the related art.
  • the rotor assembly includes a rotor core 1 , and in a transverse section perpendicular to the central axis of the rotor core 1 , each pole of the rotor core 1 includes at least Two layers of installation grooves 2 are arranged radially spaced apart.
  • the permanent magnets 3 are installed in the installation groove 2.
  • the two ends of the installation groove 2 are respectively provided with q-axis squirrel cage grooves 4.
  • the direction width decreases, and the q-axis squirrel cage slot 4 increases in length along the direction close to the q-axis.
  • the width of the q-axis squirrel cage slot 4 decreases along the direction close to the q-axis. Therefore, the closer to the q-axis, the smaller the width of the q-axis squirrel cage slot 4, and the q-axis squirrel cage slot 4 is closer to the q-axis.
  • the length of the axis increases, which will make the q-axis squirrel cage slot 4 closer to the q-axis, and the longer it extends into the rotor core 1. Therefore, the increase in the length of the q-axis squirrel cage slot 4 can be used to make up for the decrease in width.
  • the squirrel cage slot can increase the area of the squirrel cage slot and increase the asynchronous torque at high speed; on the other hand, it can reduce the area difference of each q-axis squirrel cage slot 4, reduce the unbalance of the squirrel cage resistance, and further reduce the negative sequence asynchronous torque, Increasing the torque and pull-in torque during the starting process of the motor helps to improve the starting ability of the motor.
  • each pole includes three layers of installation grooves 2 .
  • the widths of the q-axis squirrel cage grooves 4 are W21, W22, W23 in sequence, and the lengths are L21, L22, L23 in sequence, and the q-axis is in sequence.
  • the cross-sectional areas of the squirrel cage slot 4 are S11, S12, and S13 in sequence, where W21 ⁇ W22 ⁇ W23, L21>L22>L23, S11 ⁇ L21 ⁇ W21, S12 ⁇ L22 ⁇ W22, and S13 ⁇ L23 ⁇ W23.
  • the q-axis squirrel cage groove 4 extends in the q-axis direction, that is, the extending direction of the q-axis squirrel cage groove is parallel to the q-axis direction.
  • the extension direction of the q-axis squirrel cage slot 4 is generally along the q-axis, which can reduce its obstruction to the q-axis magnetic flux, and the magnetic flux can enter the stator more easily, which can effectively increase the reluctance torque.
  • the mounting slots 2 on the same layer and the q-axis squirrel cage slots 4 at both ends together form a magnetic barrier layer.
  • at least two or more magnetic barrier layers are arranged in the radial direction of the rotor core 1, which can ensure that the number of magnetic barrier layers can be sufficient, so that the d-axis reluctance of the motor increases, and more permanent magnet magnetic fields tend to
  • the gap between the d-axis inductance and the q-axis inductance increases, increasing the motor salient pole difference and increasing the reluctance torque.
  • the mounting slot 2, the q-axis squirrel cage slot 4 and the permanent magnet 3 are symmetrically distributed with respect to the d-axis or the q-axis.
  • the lengths of the permanent magnets 3 are L11, L12... L1n in sequence, where L11 ⁇ L12... ⁇ L1n, where n is The number of layers in the mounting slot.
  • the permanent magnets 3 are also three-layered, and the lengths of the permanent magnets 3 are L11, L12, and L13 in sequence, where L11 ⁇ L12 ⁇ L13, that is, the length of the outer permanent magnet 3 is greater than or equal to the phase. Adjacent to the length of the inner layer permanent magnet 3 .
  • the widths of the permanent magnets 3 are W11, W12...
  • the width of the permanent magnets 3 is greater than or equal to the width of the adjacent inner layer permanent magnets 3 .
  • the permanent magnets 3 are also three-layered, and the widths of the permanent magnets 3 are W11, W12, and W13 in sequence, where W11 ⁇ W12 ⁇ W13.
  • the anti-demagnetization capability of the permanent magnets 3 can be improved while the permanent magnets 3 are effectively used to improve the motor torque.
  • the sum of the widths W of all permanent magnets 3 under the same pole accounts for 0.15-0.45 times the effective radial width W1 of the rotor core 1, and the effective radial width W1 of the rotor core 1 is The radial width between the outer circle of the central shaft hole 6 and the outer circle of the rotor core 1 .
  • the permanent magnet 3 is a rare earth permanent magnet 3, 0.15 ⁇ W1 ⁇ W ⁇ 0.25 ⁇ W1; when the permanent magnet 3 is a ferrite, 0.25 ⁇ W1 ⁇ W ⁇ 0.45 ⁇ W1.
  • Rare earth permanent magnets have strong remanence and strong anti-demagnetization, so their thickness is small, which can reduce the amount of permanent magnets; Demagnetization ability.
  • the width of the magnetic conduction channel between the adjacent q-axis squirrel cage slots 4 is W4, and the conduction between the two installation slots 2 corresponding to the adjacent q-axis squirrel cage slots 4 is W4.
  • the width of the magnetic channel is W5, where W4 ⁇ W5, so that the width of the magnetic conductive channel can be matched with its location, so as to avoid excessive saturation of the magnetic conductive channel and improve the efficiency of the motor.
  • At least one side of at least part of the q-axis squirrel cage slot 4 has a cut edge 8 , and the cut edge 8 is located at one end of the q-axis squirrel cage slot 4 close to the outer circumference of the rotor.
  • the angle between the cut edge 8 and the slot edge extension line of the q-axis squirrel cage slot 4 corresponding to the cut edge 8 is a, where 10° ⁇ a ⁇ 50°.
  • the trimming 8 can make the magnetic flux entering the stator change smoothly, reduce the sudden change of the magnetic flux, and reduce the torque ripple of the motor.
  • the rotor core 1 is also provided with a d-axis squirrel cage slot 5, and the d-axis squirrel cage slot 5 is located on the side of the radially outermost q-axis squirrel cage slot 4 close to the d-axis.
  • the d-axis squirrel cage groove 5 is located in the groove formed by the radially outermost q-axis squirrel cage groove 4 and the installation groove 2. The opening of the groove faces the outer circle of the rotor, and the d-axis squirrel cage groove 5 is closer to the d-axis than the radially outermost q-axis cage slot 4 .
  • the minimum distance W3 between adjacent d-axis squirrel cage slots 5 is greater than the radially outermost permanent magnet 3
  • the radial thickness of the outermost permanent magnet 3 in the radial direction is W13, W3>W13. This limitation can effectively avoid the problem of excessive saturation of the permanent magnets 3 at the magnetic conducting channels between the adjacent d-axis squirrel cage slots 5 .
  • the d-axis squirrel cage slot 5 extends in the circumferential direction.
  • the q-axis squirrel cage slot 4 and the d-axis squirrel cage slot 5 are filled with conductive and non-magnetic material.
  • the conductive and non-magnetic material is, for example, aluminum or an aluminum alloy.
  • the squirrel cage slot includes the q-axis squirrel cage slot 4 and the d-axis squirrel cage slot 5.
  • the total area of the squirrel cage slot filled with conductive and non-magnetic materials is S1, that is, the total area of the q-axis squirrel cage slot 4 and the d-axis squirrel cage slot 5.
  • the area is S1
  • the total area of all squirrel cage slots and all installation slots 2 is S, where S1 ⁇ 0.4 ⁇ S.
  • both ends of the rotor core 1 are provided with squirrel cage end rings 9 .
  • the squirrel cage end rings 9 cover all the squirrel cage grooves and connect the squirrel cage grooves to form a squirrel cage.
  • the above-mentioned squirrel cage end ring 9 is, for example, a die-cast squirrel cage end ring. All cage slots refer to all q-axis cage slots 4 and all d-axis cage slots 5 .
  • the squirrel cage can help the motor to start, and the larger slot area of the squirrel cage can effectively improve the synchronization ability of the motor to start.
  • Both ends of the rotor core 1 are provided with non-magnetic baffles 11 , and the baffles 11 are fixed on the rotor core 1 by inserting rivets 12 through the rivet holes 10 to block and fix the permanent magnets 3 ;
  • the injection molding material is injected, and the permanent magnet 3 is solidified and fixed.
  • the injection molding material is a non-conductive and non-magnetic material.
  • the self-starting permanent magnet synchronous reluctance motor using the technology of the present application has the same stator and current, the average torque is improved, the torque ripple is reduced, and the technical effect is better.
  • the cross-sectional shape of the q-axis squirrel cage slot 4 and the mounting slot 2 perpendicular to the central axis of the rotor core 1 is a rectangle or a shape having a circular arc outline.
  • the rectangle or the shape with the arc outline here are approximate figures.
  • the installation slot 2 will be designed as a transverse direction perpendicular to the central axis of the rotor core 1.
  • the cross-section is trapezoidal, but the overall structure is similar to that of a rectangle, with straight edges.
  • a self-starting permanent magnet synchronous reluctance motor includes a rotor assembly, and the rotor assembly is the above-mentioned rotor assembly.
  • the self-starting permanent magnet synchronous reluctance motor also includes a stator.
  • An air gap is formed between the stator and the rotor assembly.
  • the width of the dividing rib 7 is L6, and the radial width of the air gap is ⁇ , where 0.5 ⁇ L6 ⁇ 1.5 ⁇ .
  • the magnetic flux leakage can be reduced as much as possible while ensuring the mechanical strength, and the performance of the motor can be improved.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Permanent Field Magnets Of Synchronous Machinery (AREA)

Abstract

La présente demande concerne un ensemble rotor et un moteur à réluctance synchrone à aimant permanent à démarrage automatique. L'ensemble rotor comprend un noyau de rotor (1); dans une section transversale perpendiculaire à un axe central du noyau de rotor (1), chaque pôle du noyau de rotor (1) comprend au moins deux couches de rainures de montage (2) qui sont disposées à des intervalles le long de la direction radiale; et des aimants permanents (3) sont montés à l'intérieur des rainures de montage (2), et des rainures de cage d'écureuil d'axe q (4) sont respectivement disposées au niveau de deux extrémités des rainures de montage (2). La largeur des rainures de cage d'écureuil d'axe q (4) le long d'une direction proche de l'axe q diminue progressivement, et la longueur des rainures de cage d'écureuil d'axe q (4) dans la direction proche de l'axe q augmente progressivement.
PCT/CN2021/124324 2021-01-26 2021-10-18 Ensemble rotor et moteur à réluctance synchrone à aimant permanent à démarrage automatique WO2022160781A1 (fr)

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CN202110109635.5A CN112968541A (zh) 2021-01-26 2021-01-26 转子组件和自起动永磁同步磁阻电机
CN202110109635.5 2021-01-26

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2024078117A1 (fr) * 2022-10-14 2024-04-18 广东美芝制冷设备有限公司 Rotor de moteur ayant des barrières de flux, moteur et compresseur

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112968541A (zh) * 2021-01-26 2021-06-15 珠海格力电器股份有限公司 转子组件和自起动永磁同步磁阻电机
CN114123581B (zh) * 2021-11-16 2023-06-06 珠海格力电器股份有限公司 自起动永磁辅助同步磁阻电机转子和电机
CN114123580B (zh) * 2021-11-16 2023-02-28 珠海格力电器股份有限公司 自起动永磁辅助同步磁阻电机转子和电机

Citations (8)

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Publication number Priority date Publication date Assignee Title
US5097166A (en) * 1990-09-24 1992-03-17 Reuland Electric Rotor lamination for an AC permanent magnet synchronous motor
CN102047531A (zh) * 2007-03-09 2011-05-04 Lg电子株式会社 电动机和包括电动机的压缩机
CN109768645A (zh) * 2019-02-14 2019-05-17 河北工业大学 一种永磁体辅助式同步磁阻电机转子结构及其设计方法
CN210839094U (zh) * 2019-06-19 2020-06-23 珠海格力电器股份有限公司 直接起动同步磁阻电机转子结构、电机
CN112104180A (zh) * 2020-08-21 2020-12-18 石镇德 异步起动永磁辅助式同步磁阻电机
CN112968554A (zh) * 2021-01-26 2021-06-15 珠海格力电器股份有限公司 转子组件和自起动永磁同步磁阻电机
CN112968541A (zh) * 2021-01-26 2021-06-15 珠海格力电器股份有限公司 转子组件和自起动永磁同步磁阻电机
CN214380340U (zh) * 2021-01-26 2021-10-08 珠海格力电器股份有限公司 转子组件和自起动永磁同步磁阻电机

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5097166A (en) * 1990-09-24 1992-03-17 Reuland Electric Rotor lamination for an AC permanent magnet synchronous motor
CN102047531A (zh) * 2007-03-09 2011-05-04 Lg电子株式会社 电动机和包括电动机的压缩机
CN109768645A (zh) * 2019-02-14 2019-05-17 河北工业大学 一种永磁体辅助式同步磁阻电机转子结构及其设计方法
CN210839094U (zh) * 2019-06-19 2020-06-23 珠海格力电器股份有限公司 直接起动同步磁阻电机转子结构、电机
CN112104180A (zh) * 2020-08-21 2020-12-18 石镇德 异步起动永磁辅助式同步磁阻电机
CN112968554A (zh) * 2021-01-26 2021-06-15 珠海格力电器股份有限公司 转子组件和自起动永磁同步磁阻电机
CN112968541A (zh) * 2021-01-26 2021-06-15 珠海格力电器股份有限公司 转子组件和自起动永磁同步磁阻电机
CN214380340U (zh) * 2021-01-26 2021-10-08 珠海格力电器股份有限公司 转子组件和自起动永磁同步磁阻电机

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2024078117A1 (fr) * 2022-10-14 2024-04-18 广东美芝制冷设备有限公司 Rotor de moteur ayant des barrières de flux, moteur et compresseur

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