EP3580834A1 - Rotating electrical machine rotor with improved configuration - Google Patents
Rotating electrical machine rotor with improved configurationInfo
- Publication number
- EP3580834A1 EP3580834A1 EP18707111.3A EP18707111A EP3580834A1 EP 3580834 A1 EP3580834 A1 EP 3580834A1 EP 18707111 A EP18707111 A EP 18707111A EP 3580834 A1 EP3580834 A1 EP 3580834A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- rotor
- permanent magnet
- arm
- rotor according
- tooth
- Prior art date
- Legal status (The legal status 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 status listed.)
- Ceased
Links
Classifications
-
- 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
- H02K1/2773—Magnets embedded in the magnetic core, e.g. interior permanent magnets [IPM] having a flux concentration effect consisting of tangentially magnetized radial 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
- H02K1/28—Means for mounting or fastening rotating magnetic parts on to, or to, the rotor structures
- H02K1/30—Means for mounting or fastening rotating magnetic parts on to, or to, the rotor structures using intermediate parts, e.g. spiders
Definitions
- the present invention relates to a rotatable electric machine rotor with improved configuration.
- the invention finds a particularly advantageous application in the field of rotating electrical machines, such as an alternator or an electric motor.
- the invention can be used advantageously with a refrigerant compressor air conditioner for a motor vehicle.
- the rotor of the electric machine comprises a body formed by a stack of sheets of sheet metal held in pack form by means of a suitable fastening system.
- the rotor comprises poles formed for example by permanent magnets located in housings formed in the magnetic mass of the rotor. Alternatively, in a configuration called "salient" poles, the poles are formed by coils wound around rotor arms.
- the stator comprises a body made of laminated sheets to reduce the eddy currents.
- the body has an annular wall, called a cylinder head, and teeth coming from the inner periphery of the annular wall.
- the stator teeth distributed on the yoke extend towards the inside of the stator towards the rotor.
- An air gap exists between the free end of the teeth, defining the inner periphery of the stator body, and the outer periphery of the rotor.
- the teeth define with the breech notches open towards the inside and intended to receive a winding for forming a polyphase stator for example of the three-phase type.
- This winding may for example consist of a set of coils electrically isolated from the stator body each wrapped around a corresponding tooth. A so-called concentrated winding is thus obtained.
- the invention aims to improve the existing configuration of such an electric machine.
- the subject of the invention is an electric machine rotor comprising:
- a body comprising teeth and housings between the teeth
- each housing at least one permanent magnet positioned in each housing, the permanent magnet comprising a remanent induction, in particular whose value is expressed in Tesia,
- the body further comprising a hub intended to be mounted on a shaft, characterized in that
- each tooth has at least two connecting arms to the hub
- each arm forms a portion of an edge of a housing of a corresponding permanent magnet
- each arm comprises a covering part with a permanent magnet corresponding to a portion of the arm opposite the permanent magnet and in that this covering part comprises a radial length and an orthoradial thickness, and
- a ratio between the radial length and the orthoradial thickness is between 1.8 Tesia divided by the value of the permanent induction of the corresponding permanent magnet and 2.16 Tesia divided by the value of the remanent induction of the magnet corresponding permanent.
- the invention thus makes it possible to limit the leakage flux passing through the link arms of the rotor by saturating them magnetically and to avoid any risk of mechanical degradation of the rotor due to the effect of the centrifugal force.
- the invention further reduces the weight of the machine and minimizes the noise level.
- Orthoradial thickness means the thickness of the arm measured in a direction perpendicular to a radial plane passing through the center of the arm and equidistant from the axis of the rotor and not axially.
- a recess is formed between the two arms of the same tooth and in that the tooth comprises a flared portion extending in the extension of each arm forming a face of the recess and in that this face forms an angle with a face of the arm forming a face of the corresponding recess of at least 150 degrees.
- At least one tooth comprises a fixing hole adapted to receive a fixing member and in that a gap between an edge of the fixing hole and an edge of the corresponding recess is constant.
- an outer diameter of the rotor is between 60mm and 70mm.
- the permanent magnets are made of rare earth.
- a thickness of each arm is between 0.4 and 0.6 mm.
- the thickness of each arm is of the order of 0.5mm. In one embodiment, the radial length is between 0.7mm and 4.2mm.
- said rotor comprises means for radial retention of the permanent magnets.
- the radial retaining means consist of lips extending on either side of the teeth of said rotor.
- said rotor comprises members for plating permanent magnets to the corresponding lips.
- each veneer member is positioned in a corresponding housing between the hub and the corresponding permanent magnet.
- the body is formed by a laminated sheet package.
- the invention also relates to a rotary electrical machine characterized in that it comprises a rotor as previously defined.
- said rotating electrical machine is configured to operate at a voltage below 350 volts.
- Figure 1 is a cross-sectional view of a rotating electrical machine according to the present invention
- Fig. 2 is a side view of the rotating electrical machine according to the present invention
- Figure 3 is a top view of the stator of the rotating electrical machine according to the present invention.
- Figure 4 is a partial sectional view of the stator of the rotating electrical machine according to the present invention.
- FIG. 5 is a diagrammatic representation of the triangular coupling of the phases of the rotating electrical machine according to the present invention.
- FIG. 6 is a graphical representation of the evolution of the parameters of yield and axial length of the stator body of the electric machine as a function of the number of turns for each coil;
- Fig. 7 is a detailed view illustrating the overlap area between a magnet and rotor link arms of the rotating electrical machine according to the present invention.
- FIG. 8 is a representation of the evolution of the leakage flux passing through the rotor arm and of the mechanical stresses applied to the rotor laminations as a function of the thickness of a linkage arm of the rotor.
- FIG. 1 represents a rotating electrical machine 10 comprising a polyphase stator 1 1 surrounding an X-axis rotor 12 intended to be mounted on a shaft (not shown).
- the stator January 1 is intended to be carried by a housing (not shown) configured to rotate the shaft via ball bearings and / or needle as visible for example in the EP1865200 supra.
- This rotary electrical machine 10 may belong to a compressor used for the refrigerant compression of the air conditioner of a motor vehicle. Alternatively, the machine 10 can operate in alternator mode.
- the rotating electrical machine 10 is advantageously configured to operate at a voltage below 350 volts.
- stator January 1 has a Y axis to be confused with the X axis of the rotor 12 when the machine 10 is in an assembled state.
- the stator 11 comprises a body 16 in the form of a bundle of laminated sheets having at its outer periphery an annular wall 17, called a yoke, and teeth 18 coming from the inner periphery of the yoke 17, as shown. These teeth 18 are uniformly distributed circumferentially and extend inwardly towards the rotor 12, such as a permanent magnet rotor described in more detail hereinafter.
- the teeth 18 delimit two by two notches 21, two successive notches 21 being thus separated by a tooth 18. These teeth 18 each have at their free end two flanges 22 extending circumferentially on either side of the tooth 18. The free ends of the teeth 18 delimit, in known manner, an air gap with the outer periphery of the rotor 12 of the rotating electrical machine 10.
- the stator January 1 further comprises a three-phase winding comprising a plurality of coils 26 to form the different poles of the stator January 1.
- Each coil 26 is formed by a plurality of turns surrounding a corresponding tooth 18.
- the coils 26 are made so that the same notch 21 receives two half-coils. This gives a winding 25 said type concentrated.
- the son of the coils 26, such as copper or aluminum wires covered with an electrically insulating layer, such as for example enamel, are each wound around a tooth 18.
- This winding operation 25 may for example be performed using a central hollow needle to allow passage of one or more son in parallel forming the coil 26. This needle moves circumferentially, axially, and radially relative to the stator January 1.
- the winding 25 can be made in situ, that is to say directly around the teeth 18 of the stator January 1. Alternatively, the winding 25 may be performed on teeth 18 reported which are then fixed on the yoke of the stator January 1 via a suitable connection system.
- the stator January 1 is equipped with notch insulators 29 taking for example the form of a thin membrane, made of an electrically insulating material and heat conductor. This thin membrane is folded, so that each notch insulator 29 is interposed between a coil 26 and the inner walls of the notches 21 of the stator January 1.
- N is in this case 5 but could alternatively have a higher or lower value while remaining at least equal to two.
- Tj corresponds to a tooth 18 of the stator 11 with j ranging from 1 to 15 for a 15-tooth stator.
- the coils are associated alternately with the different phases of the stator 1 1.
- the coil of the tooth T1 is associated with the phase W
- the coil of the tooth T2 is associated with the phase V
- the coil of the tooth T3 is associated with the phase U, and so on.
- the coils 26 of each phase U, V, W are electrically connected in series.
- the U1, U2, U3, U4, U5 coils of the U phase are electrically connected in series.
- the coils V1, V2, V3, V4, V5 of phase V are electrically connected in series.
- the W1, W2, W3, W4, W5 coils of the W phase are electrically connected in series.
- the phases U, V, W of the machine 10 are advantageously coupled in a triangle.
- the EU input of the phase U is connected with the output SW of the phase W.
- the input EW of the phase W is connected with the output SV of the phase V.
- the input EV of the phase V is connected with the SU output of phase U.
- the product of the number of turns Ns of each coil 26, the axial length L1 of the stator body 16 expressed in millimeters, and the internal diameter L2 of the stator body 16 expressed in millimeters, the product NsxL1 XL2, is between 38998 and 39142.
- the number of turns Ns is between 23 and 37
- the axial length L1 of the stator body 16 is between 17mm and 27mm
- the internal diameter L2 of the stator body 16 is between 62mm and 67mm.
- the stator body 16 has an external diameter L3 of 94 mm plus or minus 20%.
- the axial length L1 of the stator body 16 is of the order of 20 mm plus or minus 20%.
- the number of turns Ns of each coil 26 is of the order of 32 plus or minus 20%.
- a thickness of the yoke 17 of the stator January 1 is of the order of 4.5 mm plus or minus 20%.
- the wire diameter of each coil 26 is of the order 0.8 mm plus or minus 20%.
- the X-axis rotor 12 comprises a body 31 formed by a laminated sheet bundle constituted by an axial stack of ferromagnetic sheets.
- the rotor body 31 comprises a hub 32 mounted on the shaft of the machine and teeth 35 extending radially relative to the hub 32.
- Housing 36 is located between the teeth 35.
- Each housing 36 is delimited by two teeth 35 consecutive, so that there is a circumferential alternation between the teeth 35 and the housings 36.
- At least one permanent magnet 39 is positioned in each housing 36.
- the magnets 39 extend radially with respect to the X axis of the rotor 12. This results in a rotor configuration 12 with a flux concentration, the lateral faces facing two consecutive magnets 39 being of the same polarity.
- Magnets 39 are preferably rare earth.
- the magnets 39 are made of ferrite according to the applications and the desired power of the rotating electrical machine 10. In this case, the rotor 12 comprises ten housings 36 and therefore ten poles.
- each tooth 35 has two arms 42 connecting to the hub 32, as is clearly visible in Figure 7.
- Each arm 42 forms a portion of a housing edge 36 of a corresponding magnet 39.
- Each arm 42 comprises a covering portion with a magnet 39 corresponding to the portion of the arm 42 opposite the magnet 39 having a radial length Hu and a thickness e measured in a direction orthoradial with respect to the axis X.
- the ratio between the radial length Hu and the thickness e of an arm 42 is between 1.8 Tesia divided by the value of the remanent induction Br of the corresponding magnet 39 and 2.16 Tesia divided by the value of the remanent induction Br of the corresponding magnet 39.
- the value of the remanent induction Br of the magnet 39 is expressed in tesia.
- This remanent induction is an intrinsic characteristic of the permanent magnet 39.
- this residual induction can be between 0.9 Tesia and 1.5 Tesia as a function of the shade of said magnet.
- the thickness e of an arm 42 is between 0.3 mm and 0.8mm in order to respect the limit at break of the sheet bundle Lim_r and the maximum permissible leakage flow Lim_f.
- a recess 45 is formed between the two arms 42 of the same corresponding tooth 35.
- the tooth 35 comprises a flared portion 46 extending in the extension of each arm 42 forming a face of the recess 45. This face forms an angle A with a face of the arm 42 forming another face of the recess 45 corresponding to at least 150 °.
- the rotor 12 has an external diameter L4 of between 60 mm and 70 mm and an internal diameter L5 of between 15 and 20 mm (see FIG.
- the thickness of each arm 42 is between 0.4 and 0.6 mm, and is preferably of the order of 0.5 mm.
- the length of the useful cover Hu is between 0.7mm and 4.2mm.
- each tooth 35 further comprises a fixing hole 47 adapted to receive a fastener, such as a rivet, for holding together the sheets of the rotor 12.
- a fastener such as a rivet
- a gap L6 measured in a plane perpendicular to the axis X between an edge of the fixing hole 47 and a rim of the corresponding recess 45 is constant.
- some teeth 35 of the rotor 12 have a fixing hole 47 but not all.
- lips 50 are implanted on the side of the free end of each tooth 35. These lips 50 extend on either side of each tooth 35. These lips 50 thus constitute means of radial retention of the magnets 39 Alternatively, the housings 36 for the magnets 39 may be closed at their outer periphery.
- Plating members 53 such as flat springs, plating the magnets 39 to the corresponding lips 50, as shown in FIG. 7. Each plating member 53 is positioned in a corresponding recess 36 between the hub 32. and the corresponding magnet 39.
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Iron Core Of Rotating Electric Machines (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR1751527A FR3063401A1 (en) | 2017-02-27 | 2017-02-27 | ROTOR OF ROTATING ELECTRICAL MACHINE WITH IMPROVED CONFIGURATION |
PCT/FR2018/050355 WO2018154218A1 (en) | 2017-02-27 | 2018-02-14 | Rotating electrical machine rotor with improved configuration |
Publications (1)
Publication Number | Publication Date |
---|---|
EP3580834A1 true EP3580834A1 (en) | 2019-12-18 |
Family
ID=59409399
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP18707111.3A Ceased EP3580834A1 (en) | 2017-02-27 | 2018-02-14 | Rotating electrical machine rotor with improved configuration |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP3580834A1 (en) |
FR (1) | FR3063401A1 (en) |
WO (1) | WO2018154218A1 (en) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2020072734A1 (en) * | 2018-10-04 | 2020-04-09 | Montana Technologies, Llc | Rotor and stator for high speed axial flux machine |
Family Cites Families (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2006283683A (en) | 2005-04-01 | 2006-10-19 | Sanden Corp | Hybrid compressor |
FR2932618B1 (en) * | 2008-06-16 | 2010-11-19 | Leroy Somer Moteurs | ROTOR WITH PERMANENT MAGNETS AND ROTATING MACHINE COMPRISING SUCH A ROTOR |
FR2958467B1 (en) * | 2010-03-31 | 2014-10-31 | Valeo Equip Electr Moteur | SYNCHRONOUS ROTATING ELECTRIC MACHINE WITH PERMANENT MAGNETS AND FLOW CONCENTRATION |
EP2568578A3 (en) * | 2011-09-07 | 2017-12-06 | Samsung Electronics Co., Ltd. | Motor and washing machine having the same |
JP5892106B2 (en) * | 2013-04-15 | 2016-03-23 | 株式会社安川電機 | Rotating electric machine and method of manufacturing rotor |
FR3009140B1 (en) * | 2013-07-29 | 2017-02-24 | Valeo Equip Electr Moteur | ROTOR WITH PERMANENT MAGNETS |
-
2017
- 2017-02-27 FR FR1751527A patent/FR3063401A1/en active Pending
-
2018
- 2018-02-14 WO PCT/FR2018/050355 patent/WO2018154218A1/en unknown
- 2018-02-14 EP EP18707111.3A patent/EP3580834A1/en not_active Ceased
Also Published As
Publication number | Publication date |
---|---|
FR3063401A1 (en) | 2018-08-31 |
WO2018154218A1 (en) | 2018-08-30 |
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