WO2023082263A1 - Stator de moteur, moteur à fréquence variable et procédé de fabrication de stator de moteur - Google Patents

Stator de moteur, moteur à fréquence variable et procédé de fabrication de stator de moteur Download PDF

Info

Publication number
WO2023082263A1
WO2023082263A1 PCT/CN2021/130689 CN2021130689W WO2023082263A1 WO 2023082263 A1 WO2023082263 A1 WO 2023082263A1 CN 2021130689 W CN2021130689 W CN 2021130689W WO 2023082263 A1 WO2023082263 A1 WO 2023082263A1
Authority
WO
WIPO (PCT)
Prior art keywords
shaped
shaped wire
type
stator
wires
Prior art date
Application number
PCT/CN2021/130689
Other languages
English (en)
Chinese (zh)
Inventor
孙阿芳
刘新华
Original Assignee
罗伯特·博世有限公司
孙阿芳
刘新华
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 罗伯特·博世有限公司, 孙阿芳, 刘新华 filed Critical 罗伯特·博世有限公司
Priority to PCT/CN2021/130689 priority Critical patent/WO2023082263A1/fr
Publication of WO2023082263A1 publication Critical patent/WO2023082263A1/fr

Links

Images

Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K3/00—Details of windings
    • H02K3/32—Windings characterised by the shape, form or construction of the insulation
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K3/00—Details of windings
    • H02K3/32—Windings characterised by the shape, form or construction of the insulation
    • H02K3/40—Windings characterised by the shape, form or construction of the insulation for high voltage, e.g. affording protection against corona discharges

Definitions

  • the present invention relates to the field of motors, and more specifically to a motor stator, a variable frequency motor and a manufacturing method of the motor stator.
  • Frequency conversion motors are widely used in household appliances, elevators, vehicles and other industries due to their advantages of energy saving, good speed regulation performance, and fast braking.
  • variable frequency power supplies due to the use of variable frequency power supplies, frequency conversion motors often suffer from problems such as insulation breakdown or insulation damage.
  • the pulsed square wave output of the pulse width modulated power supply used by the variable frequency motor makes the stator winding withstand relatively high overvoltage at the first and last turn coils. This can lead to partial discharges and damage to the insulation structure of the stator windings, even leading to failure of the motor.
  • the stator winding can be made of corona-resistant enameled wire to improve the corona resistance performance of the stator winding.
  • This corona-resistant enameled wire can be prepared by adding alumina particles or titanium dioxide to the insulating varnish layer of the corona-resistant enameled wire.
  • the corona resistance performance of the stator winding can also be improved by additionally wrapping a corona-resistant insulating film or sheathing an insulating tube outside the insulating layer of the stator winding.
  • these known motor stators and their manufacturing methods still have problems such as high material cost and complicated manufacturing process.
  • the object of the present invention is to provide an improved motor stator, a corresponding variable frequency motor and a corresponding manufacturing method of the motor stator, thereby providing a more reliable motor stator in an easy-to-manufacture and cost-effective manner.
  • a motor stator which includes: a stator core, and a stator winding mounted to the stator core, wherein at least one of the stator windings is connected in series by a plurality of shaped wires wherein at least one of the first shaped wire and the last shaped wire is formed from a first type of shaped wire, and at least one shaped wire located between the first shaped wire and the last shaped wire is formed from a second type of shaped wire Formed, wherein the profiled wire of the first type is configured as an insulating layer with a higher corona resistance than the profiled wire of the second type.
  • variable frequency motor includes a motor stator according to the present invention and a motor rotor capable of rotating relative to the motor stator.
  • a manufacturing method of a motor stator which is used to manufacture a motor stator according to the present invention, wherein the manufacturing method includes: providing a stator core and including a first type of shaped wire and a second A plurality of shaped wires of a second type of shaped wire, wherein the first type of shaped wire is configured to have a more corona-resistant insulation than the second type of shaped wire; the plurality of shaped wires are sequentially mounted to the stator core such that at least one of the first shaped wire and the last shaped wire is formed from a first type of shaped wire and at least one shaped wire located between the first shaped wire and the last shaped wire is formed from a second type of shaped wire forming; and conductively connecting the plurality of shaped wires to form a stator winding.
  • the positive effect of the present invention is that: the first type of shaped wire and the second type of shaped wire can be mass-produced respectively, so that they have insulating layers with different corona resistance properties, and then the different types of shaped wires can be installed in a predetermined order to the stator core and are electrically connected to each other to form a stator winding that can withstand higher voltages near the head end and/or tail end without insulation breakdown.
  • a more reliable electric machine stator can be provided in a manufacturable and cost-effective manner.
  • Fig. 1 schematically shows a motor stator according to an exemplary embodiment of the present invention
  • Figure 2 schematically shows a single U-shaped wire
  • Fig. 3 schematically shows the cross-sections of the first type of shaped wire and the second type of shaped wire according to an exemplary embodiment of the present invention
  • Fig. 4 schematically shows the cross-sections of the first type of shaped wire and the second type of shaped wire according to an exemplary embodiment of the present invention.
  • Fig. 5 schematically shows a variable frequency motor according to an exemplary embodiment of the present invention.
  • Fig. 1 schematically shows a motor stator 10 according to an exemplary embodiment of the present invention.
  • the motor stator 10 includes a stator core 11 and a stator winding 12 mounted to the stator core 11 .
  • the stator core 11 is made of silicon steel, for example, and is formed in a substantially cylindrical shape.
  • the stator core 11 may have a plurality of axial slots arranged in the circumferential direction so that the stator winding 12 can be inserted into the axial slots.
  • At least one of the stator windings 12 is formed by connecting a plurality of shaped wires 120 in series, wherein at least one of the first shaped wire 120 and the last shaped wire 120 is formed by a first type of shaped wire 121, and at least one is located in the first
  • the shaped wire 120 between the first shaped wire 120 and the last shaped wire 120 is formed by the second type of shaped wire 122, and the insulating layer 124 of the first type of shaped wire 121 is configured to have a thickness more than that of the second type of shaped wire 122. Strong corona resistance performance.
  • a more reliable motor stator 10 can be provided in an easy-to-manufacture and cost-effective manner, which can reduce the possibility of local insulation damage or insulation breakdown of the stator winding 12 .
  • the first shaped wire 120 and the last shaped wire 120 are determined according to the sequence arranged from the beginning end to the tail end of the stator winding 12 .
  • the head end represents one end of the stator winding 12 inflowing current
  • the tail end represents one end of the stator winding 12 outflowing current.
  • the insulating layer 124 of the first type of shaped wire 121 has stronger corona resistance performance, even if the wires near the head end and/or tail end of the stator winding 12 are subjected to higher overvoltage, the insulation of the stator winding 12 layer will still not be destroyed by partial discharge. Accordingly, it is possible to reduce the possibility of insulation breakdown of the motor stator 10 when the variable-frequency alternating current is applied.
  • other shaped wires 120 can be formed by the second type of shaped wires 122 with lower cost, thereby effectively reducing the material cost of the motor stator 10 .
  • the special advantage of the present invention is that the first type of shaped wires 121 and the second type of shaped wires 122 in the stator winding 12 can be produced in batches respectively, so as to have insulating layers 124 with different corona resistance properties accordingly, and then by Different types of shaped wires 120 are installed to the stator core 11 in a predetermined order and electrically connected to each other to form a stator winding 12 that can withstand higher voltage near the head end and/or tail end without insulation breakdown. Thereby, a more reliable electric machine stator 10 can be provided in an easy-to-manufacture and cost-effective manner.
  • FIG. 1 An electric machine stator 10 for a three-phase electric machine is shown by way of example in FIG. 1 , which accordingly has three stator windings 12 .
  • the individual stator windings 12 can be formed in the same way.
  • the first shaped wire 120 and the last shaped wire 120 are formed by the first type of shaped wire 121, and the shaped wires 120 between the first shaped wire 120 and the last shaped wire 120 are formed by A second type of shaped wire 122 is formed.
  • the first profiled conductor 120 and the last profiled conductor 120 of the stator winding 12 will be subjected to a significantly higher voltage than the profiled conductor 120 lying between them.
  • a more reliable motor stator 10 can be provided at as low a cost as possible.
  • the shaped wires 120 forming the first coil and the tail coil of the stator winding 12 are formed by the first type of shaped wire 121 .
  • the first two shaped wires 120 may be formed by the first type of shaped wires 121 .
  • the first and last turns of the stator winding 12 tend to experience the greatest voltage peaks. As a result, the reliability of the stator winding 12 can be increased in a targeted and cost-effective manner.
  • the first n shaped wires 120 and the last n shaped wires 120 are located in the first n shaped wires 120
  • the shaped wires 120 between the wires 120 and the last n shaped wires 120 have an insulating layer 124 with stronger corona resistance performance, wherein n is greater than or equal to 2.
  • the 2nd to n shaped wires 120 and the penultimate 2nd to n shaped wires 120 may be formed of the first type of shaped wire 121 like the first shaped wire 120 and the last shaped wire 120 .
  • the corona resistance of the insulating layer 124 of the 2nd to n shaped wires 120 and the penultimate 2nd to n shaped wires 120 is weaker than the corona resistant performance of the insulating layer 124 of the first type of shaped wire 121, but lower than that of the second type of shaped wire 121.
  • the insulating layer 124 of the shaped wire 122 has strong corona resistance.
  • FIG. 1 shows a shaped wire 120 shaped into a U-shaped wire (also called a hairpin wire).
  • Figure 2 schematically shows individual U-shaped wires.
  • the U-shaped wire is generally U-shaped, and has a head and a pair of legs.
  • each U-shaped wire can be inserted into the axial slots of the stator core 11, the parts of the legs accommodated in the axial slots can form effective sides, and the free ends of the legs are exposed outside the axial slots.
  • the legs of the U-shaped wire can be bent (as shown in Figure 2) so that the free end between its free end and the free end of another U-shaped wire form a conductive connection.
  • adjacent free ends may be welded together and then optionally coated with an insulating coating at the welded points.
  • the stator winding 12 which is completely assembled on the stator core 11 is thus formed.
  • the shaped wire 120 can also be shaped as an I-shaped wire. In fact, two matching I-shaped wires can form a corresponding U-shaped wire by adding an additional welding, thereby forming a structure similar to the illustrated solution.
  • Fig. 3 schematically shows the cross-sections of the first type of shaped wire 121 and the second type of shaped wire 122 in an exemplary embodiment of the present invention.
  • the shaped wire 120 includes a conductor 123 and an insulating layer 124 surrounding the conductor 123 .
  • Conductor 123 is made of a material with good electrical conductivity, such as copper or aluminum.
  • the profiled wire 120 is designed as a flat wire with a rectangular cross section. Such shaped wires 120 can improve the slot fill rate.
  • the shaped wire 120 may also have a circular cross section.
  • the insulating layer 124 can be formed, for example, by applying one or more coating layers on the conductor 123 .
  • the thickness W1 of the insulating layer 124 of the first type of shaped wire 121 is greater than the thickness W2 of the insulating layer 124 of the second type of shaped wire 122 .
  • the first type shaped wire 121 may have the same configuration as the second type shaped wire 122 except for the thickness of the insulating layer 124 .
  • Fig. 4 schematically shows the cross-sections of the first type of shaped wire 121 and the second type of shaped wire 122 in an exemplary embodiment of the present invention.
  • the insulating layer 124 of the first type of shaped wire 121 comprises a material with stronger corona resistance than the insulating layer 124 of the second type of shaped wire 122 .
  • the insulating layer 124 of the first type of shaped wire 121 may include a resin material added with inorganic insulating particles such as silicon dioxide, titanium dioxide, aluminum oxide and the like.
  • the insulating layer 124 of the first type of shaped wire 121 may have the same thickness as the insulating layer 124 of the second type of shaped wire 122 .
  • the insulating layer 124 of the first type of shaped wire 121 can also be realized in a combined manner by using different insulating materials and different thicknesses of the insulating layer 124 or by other means. Stronger corona resistance.
  • Fig. 5 schematically shows a variable frequency motor 1 according to an exemplary embodiment of the present invention.
  • the variable frequency motor 1 includes a motor stator 10 and a motor rotor 20 that can rotate relative to the motor stator 10 .
  • the motor stator 10 and the motor rotor 20 may be arranged in a housing (not shown in the figure), the motor rotor 20 is arranged in a cavity bounded by the motor stator 10 and connected to the motor shaft 30 .
  • the motor stator 10 is supplied with variable frequency alternating current generated by a frequency converter, for example.
  • the electric machine stator 10 may be implemented as an electric machine stator 10 according to any of the embodiments of the present invention. It is shown here by way of example that the electric machine stator 10 comprises a first type of profiled conductor 121 and a second type of profiled conductor 122 comprising different insulating materials.
  • the present invention also provides a manufacturing method of the motor stator 10 .
  • the manufacturing method can be used to manufacture the motor stator 10 in the foregoing embodiments or combinations thereof.
  • the manufacturing method includes: providing a stator core 11 and a plurality of shaped wires 120 including a first type of shaped wire 121 and a second type of shaped wire 122, wherein the first type of shaped wire 121 is configured to be compatible with the second type of shaped wire
  • the insulating layer 124 that has stronger corona resistance performance compared with similar shaped wires 122;
  • the plurality of shaped wires 120 are installed to the stator core 11 in order, so that the first shaped wire 120 and the last shaped wire 120 At least one is formed by the first type of shaped wire 121, at least one shaped wire 120 between the first shaped wire 120 and the last shaped wire 120 is formed by the second type of shaped wire 122; then the plurality of shaped wires 120 Successively conductively connected to form the stator winding 12 .
  • stator winding 12 can be satisfied with stronger corona resistance near the head end and/or tail end by separately producing different types of shaped wires 120 and then inserting them into the stator core 11 in sequence and connecting them to each other. performance requirements.
  • This manufacturing method effectively reduces manufacturing cost and manufacturing difficulty.

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Manufacture Of Motors, Generators (AREA)
  • Windings For Motors And Generators (AREA)

Abstract

La présente invention concerne un stator de moteur (10), comprenant : un noyau statorique (11), et des enroulements statoriques (12) montés sur le noyau statorique (11). Au moins un enroulement statorique (12) parmi les enroulements statoriques (12) est formé en reliant en série une pluralité de fils de formage (120). Au moins l'un du premier fil de formage (120) et du dernier fil de formage (120) est formé par un fil de formage de premier type (121), et au moins un fil de formage (120) situé entre le premier fil de formage (120) et le dernier fil de formage (120) est formé par un fil de formage de second type (122). Le fil de formage de premier type (121) est configuré pour avoir une couche isolante (124) ayant une résistance à l'effet couronne plus forte que celle du fil de formage de second type (122). L'invention concerne en outre un moteur à fréquence variable correspondant et un procédé de fabrication correspondant pour le stator de moteur. Selon l'invention, un stator de moteur plus fiable peut être fourni dans un mode qui est pratique à fabriquer et économique.
PCT/CN2021/130689 2021-11-15 2021-11-15 Stator de moteur, moteur à fréquence variable et procédé de fabrication de stator de moteur WO2023082263A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PCT/CN2021/130689 WO2023082263A1 (fr) 2021-11-15 2021-11-15 Stator de moteur, moteur à fréquence variable et procédé de fabrication de stator de moteur

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/CN2021/130689 WO2023082263A1 (fr) 2021-11-15 2021-11-15 Stator de moteur, moteur à fréquence variable et procédé de fabrication de stator de moteur

Publications (1)

Publication Number Publication Date
WO2023082263A1 true WO2023082263A1 (fr) 2023-05-19

Family

ID=86334905

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/CN2021/130689 WO2023082263A1 (fr) 2021-11-15 2021-11-15 Stator de moteur, moteur à fréquence variable et procédé de fabrication de stator de moteur

Country Status (1)

Country Link
WO (1) WO2023082263A1 (fr)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS63186540A (ja) * 1987-01-27 1988-08-02 Toshiba Corp 回転電機
WO2012114181A1 (fr) * 2011-02-22 2012-08-30 Toyota Jidosha Kabushiki Kaisha Stator de machine électrique rotative
KR20180057949A (ko) * 2016-11-23 2018-05-31 현대자동차주식회사 구동모터의 헤어핀 권선 타입 고정자
US20200220408A1 (en) * 2019-01-07 2020-07-09 Lg Electronics Inc. Stator for electric rotating machine

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS63186540A (ja) * 1987-01-27 1988-08-02 Toshiba Corp 回転電機
WO2012114181A1 (fr) * 2011-02-22 2012-08-30 Toyota Jidosha Kabushiki Kaisha Stator de machine électrique rotative
KR20180057949A (ko) * 2016-11-23 2018-05-31 현대자동차주식회사 구동모터의 헤어핀 권선 타입 고정자
US20200220408A1 (en) * 2019-01-07 2020-07-09 Lg Electronics Inc. Stator for electric rotating machine

Similar Documents

Publication Publication Date Title
US7402934B1 (en) High performance air core motor-generator winding
US11063488B2 (en) Stator for electric rotating machine
US10153674B2 (en) Armature for an electric machine
US7977840B2 (en) Stator winding for a slotless motor
US20080036323A1 (en) Permanent Magnet Synchronous Machine with Flat-Wire Windings
TW201521330A (zh) 集中繞組馬達
US11063489B2 (en) Fractional slot electric motors with coil elements having rectangular cross-sections
US9705374B2 (en) Rotary electric machine and a manufacturing method thereof
GB2595933A (en) Electric machine apparatus
RU2448403C2 (ru) Статор и способ его сборки
JP2004072824A (ja) Ａｃモータの固定子
US6445102B1 (en) Travelling-wave motor and method for producing same
JP2012095488A (ja) 回転電機用ロータ、およびこれを用いた回転電機
JP5072502B2 (ja) 回転電動機
WO2023082263A1 (fr) Stator de moteur, moteur à fréquence variable et procédé de fabrication de stator de moteur
US10454332B2 (en) Active part of an electric machine
JP2013172486A (ja) 回転電機
WO2020188789A1 (fr) Machine électrique rotative de type à entrefer axial
CN110289717B (zh) 一种永磁电机定子多相绕组
CN216851441U (zh) 定子、电机和压缩机
CN116404789B (zh) 电机及具有其的驱动系统、车辆
JP2015050919A (ja) 回転電機
JP5904099B2 (ja) 回転電機のステータ
CN220325368U (zh) 一种发电机散嵌型绕组结构
JP7153437B2 (ja) 回転電機

Legal Events

Date Code Title Description
121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 21963709

Country of ref document: EP

Kind code of ref document: A1