WO2022038204A1 - Ensemble arbre de moteur comprenant un arbre de moteur et un tuyau d'alimentation - Google Patents

Ensemble arbre de moteur comprenant un arbre de moteur et un tuyau d'alimentation Download PDF

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Publication number
WO2022038204A1
WO2022038204A1 PCT/EP2021/072976 EP2021072976W WO2022038204A1 WO 2022038204 A1 WO2022038204 A1 WO 2022038204A1 EP 2021072976 W EP2021072976 W EP 2021072976W WO 2022038204 A1 WO2022038204 A1 WO 2022038204A1
Authority
WO
WIPO (PCT)
Prior art keywords
motor shaft
inlet pipe
motor
opening
cooling medium
Prior art date
Application number
PCT/EP2021/072976
Other languages
German (de)
English (en)
Inventor
André Zolko Gasko
Original Assignee
Nidec Motors & Actuators (Germany) Gmbh
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 Nidec Motors & Actuators (Germany) Gmbh filed Critical Nidec Motors & Actuators (Germany) Gmbh
Publication of WO2022038204A1 publication Critical patent/WO2022038204A1/fr

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Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K7/00—Arrangements for handling mechanical energy structurally associated with dynamo-electric machines, e.g. structural association with mechanical driving motors or auxiliary dynamo-electric machines
    • H02K7/003—Couplings; Details of shafts
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K9/00—Arrangements for cooling or ventilating
    • H02K9/19—Arrangements for cooling or ventilating for machines with closed casing and closed-circuit cooling using a liquid cooling medium, e.g. oil
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K7/00—Arrangements for handling mechanical energy structurally associated with dynamo-electric machines, e.g. structural association with mechanical driving motors or auxiliary dynamo-electric machines
    • H02K7/006—Structural association of a motor or generator with the drive train of a motor vehicle

Definitions

  • the present invention relates to a motor shaft arrangement having the features of the preamble of claim 1 and an electric motor, in particular a permanent magnet synchronous motor, having the features of the preamble of claim 7.
  • Permanent magnet synchronous motors include a rotor connected to a motor shaft and rotatably supported in a housing. The rotor is fitted with permanent magnets.
  • a stator is arranged around the motor and carries a number of windings on an iron core. When controlled appropriately, the windings generate a magnetic field that drives the rotor to rotate.
  • Electric motors with high specific power are limited in their power output due to their self-heating. It is therefore known to cool the rotor using liquid coolants.
  • the coolant is fed into the electric motor via a motor shaft designed as a hollow shaft.
  • the liquid coolant is injected into the motor via openings in the motor shaft inside the motor either directly or via appropriately positioned and designed rotor end plates.
  • a disadvantage is that depending on the speed of rotation of the motor shaft, the coolant is distributed differently in the shaft and in the motor. This leads to hot spots, especially in the area of the winding ends, which can be critical.
  • a motor shaft arrangement having a motor shaft which is designed as a hollow shaft with an open end and a closed end and which encloses a space.
  • the motor shaft is at least partially penetrated by an inlet pipe, which extends into the space and forms an inlet for a cooling medium, in particular oil, into the hollow shaft.
  • the inlet pipe has at least one opening located within the shaft, which is fluidically connected to the part of the space surrounding the inlet pipe.
  • the hollow shaft has penetrating openings through which the cooling medium can flow from the part of the space to the outside. The inlet pipe thus defines the inflow of the cooling medium into the motor shaft.
  • the at least one inlet pipe opening located within the motor shaft is an open end of the inlet pipe.
  • the open end is in a range between 30% and 70% of the axial length of the motor shaft.
  • the coolant only flows into the shaft in a central area and from there it can be distributed evenly in the motor shaft and the rotor connected to the motor shaft.
  • the cooling medium flows out of the open end of the inlet pipe into the hollow shaft.
  • the axial distance between the at least one opening of the inlet pipe located within the motor shaft and the openings penetrating the motor shaft is approximately the same.
  • the at least one opening of the inlet pipe located within the shaft is approximately half the axial length of the motor shaft.
  • a flow resistance in particular a baffle plate, which corresponds to the open end of the inlet pipe in such a way that the area between the opening of the open end and of the flow resistance can flow through the cooling medium approximately radially to the axis of rotation.
  • the closed end of the motor shaft is preferably formed by a cover or insert which has an elevation on the inside which has the flow resistance at its end. But it is also conceivable that the flow resistance is attached to the inlet pipe or to the motor shaft.
  • the feed pipe is cylindrical, in particular circular-cylindrical. It is advantageous if the inlet pipe is arranged coaxially in the motor shaft.
  • the inlet pipe is completely contained in the motor shaft.
  • the inlet pipe is preferably fastened to the motor shaft inside the motor shaft, preferably screwed, pressed in, welded or the like.
  • a nozzle can be used through which the cooling medium is fed into the inlet pipe.
  • an electric motor in particular a permanent magnet synchronous motor, preferably as a traction motor for motor vehicles, is provided with a motor shaft arrangement as described above, the permanent magnet synchronous motor comprising a rotor with permanent magnets, which is fluidically connected to the openings of the motor shaft and can therefore be flowed through by the cooling medium .
  • the motor is an internal rotor PMSM.
  • the rotor surrounds the motor shaft of the motor shaft arrangement and is attached to it in a rotationally fixed manner.
  • the position and number of openings in the hollow shaft are preferably selected in such a way that the cooling medium can flow evenly into the rotor for cooling. Diametrically arranged openings are preferably provided in each end area.
  • the cooling medium then preferably flows off and flows through the stator and the entire engine compartment before it is returned through an opening into the rotor arrangement or the inlet pipe.
  • the electric motor is preferably used in an electric drive unit for battery electric vehicles or hybrid electric vehicles having a vehicle axle and a transmission. Such units are also known under the term "E-axis". Two preferred embodiments of the invention are explained in more detail below with reference to the drawings. Identical or functionally identical components are provided with the same reference symbols in the figures. Show it:
  • Figure 1 a spatial representation of a motor shaft arrangement
  • FIG. 2 a three-dimensional view of an inlet pipe of the motor shaft arrangement of FIG. 1,
  • Figure 3 a cross section through the motor shaft arrangement of Figure 1
  • Figure 4 a spatial view of another motor shaft arrangement
  • Figure 5 a longitudinal section through the motor shaft arrangement of Figure 4.
  • FIG. 1 shows a motor shaft arrangement 1 of an internal rotor PMSM.
  • a rotor not shown, surrounds a motor shaft 2 of the motor shaft arrangement 1 and is attached to it in a rotationally fixed manner.
  • the motor shaft 2 defines an axis of rotation D with its axis of rotation and/or axis of symmetry.
  • a rotor arrangement made up of rotor and motor shaft is constructed coaxially. The inside of the rotor is in contact with the outside of the motor shaft.
  • the motor shaft 2 is designed as a hollow shaft with an open end 3 and a closed end 4 . It forms a channel for the flow of the cooling medium.
  • the motor shaft arrangement 1 has an inlet pipe 5 which is designed to feed a coolant into the hollow shaft.
  • the inlet pipe 5 is arranged coaxially in the motor shaft 2 with respect to the axis of rotation D. It extends in the axial direction in relation to the axis of rotation D over approximately half the axial length of the motor shaft 2. It has an open end 6 for introducing the coolant and a closed end 7.
  • the inlet pipe 5 has a plurality of penetrating openings 8 in the area of the lateral surface 9 at its closed end 7 lying in the motor shaft.
  • the openings 8 are slot-shaped and each extend with their longitudinal axis parallel to the axis of rotation D.
  • the openings 8 are spaced evenly along the circumference.
  • the openings 8 are in the middle area of the motor shaft 2 and are thus arranged centrally in the shaft 2 .
  • An intermediate space 10 for accommodating a coolant is formed between an outside of the inlet pipe 5 and an inside of the motor shaft 2 .
  • the outer diameter of the inlet pipe 5 is smaller than the inner diameter of the motor shaft 2, so that the intermediate space 10 is an annular space.
  • the open end 3 of the motor shaft is sealed off from the inlet pipe 5 .
  • a liquid coolant is fed into the motor shaft 2 exclusively through the inlet pipe 5 .
  • the arrows indicate schematically the flow direction of the coolant.
  • the coolant exits radially through the openings 8 in the inlet pipe 5 into the intermediate space 10 between the motor shaft 2 and the inlet pipe 5 and reaches the center of the shaft 2 . From there, the coolant is distributed in the channel of the entire shaft 2 .
  • the motor shaft 2 has penetrating openings 11 through which the coolant is conducted into the rotor. Cooling channels can also be provided in the rotor, so that the coolant can be guided past the magnets in a targeted manner.
  • the penetrating openings 11 are preferably provided diametrically and at two different axial positions in the motor shaft 2 .
  • a first position 12 is close to the open end 3 and a second position 13 is close to the closed end 4. At each position 12,13 two opposite openings are provided.
  • the axial distance in the longitudinal direction between the two positions 12,13 and the openings 8 is approximately
  • the inlet pipe 5 is shown in detail in FIG. It is cylindrical and has, in the immediate vicinity of its closed end 7, the openings 8 for injecting the coolant radially into the intermediate space.
  • FIG. 3 shows a cross section through the motor shaft arrangement 1 at the axial level of the openings of the inlet pipe.
  • the coolant is fed into the intermediate space 10 in the axial center of the motor shaft 2 and only there does it come into contact with the inside 20 of the motor shaft 2. From there, the coolant is distributed evenly in the intermediate space 10, regardless of the rotational speed of the motor shaft 2 in each case diametrically arranged in the end openings of the motor shaft 11, the cooling medium flows out of the Motor shaft assembly 1 in the rotor, not shown. The cooling medium then flows out and flows through the stator and the entire engine compartment before it is returned through an opening into the rotor arrangement or the inlet pipe.
  • FIG. 4 shows another motor shaft arrangement 1. Only the differences from the first embodiment are described below.
  • the inlet pipe 5 has two open ends 6.70.
  • the inlet pipe 5 is cylindrical and screwed to the motor shaft on the inside.
  • the cooling medium is fed into the motor shaft through the inlet pipe 5 and exits at the open end 70 into the duct.
  • the closed end 4 of the hollow-cylindrical motor shaft 2 is formed by a cover 14 or insert.
  • the cover 14 has an elevation 140 on the inside which protrudes into the channel.
  • a flow resistance 141 is arranged at the end of the elevation 140 and is shaped in such a way that the outside diameter is larger than the inside diameter of the inlet pipe 5 .
  • the flow resistance 141 is plate-shaped and placed at a distance from the open end of the inflow pipe 70 in the axial direction. The distance is selected in such a way that the coolant emerging from the inlet pipe 5 flows radially outwards and only then is evenly distributed in the shaft 2 or the channel.
  • FIG. 5 shows a longitudinal section through the arrangement described above.
  • the coolant is fed into the inlet pipe 5 through a nozzle 15 .
  • the inlet pipe 5 is thus completely inside the motor shaft 2.
  • the inlet pipe 5 is fixed to the motor shaft 2 and the open end of the motor shaft 3 is sealed by the inlet pipe 5.
  • the hollow shaft 2 thus defines a space 16 which is closed off in the axial direction.
  • the cooling liquid in particular oil, is introduced into the interior of the shaft through the nozzle 15 .
  • the liquid emerges radially outwards from the inlet pipe 5 into the part of the space 16 surrounding the inlet pipe and flows evenly to the openings 11 in the shaft.
  • the openings 11 are arranged diametrically.
  • the openings at one end 12 are offset by 90° in the circumferential direction relative to the openings at the other end 13 .

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Motor Or Generator Cooling System (AREA)

Abstract

L'invention concerne un ensemble arbre de moteur (1) comprenant un arbre de moteur (2) se présentant sous la forme d'un arbre creux comportant une extrémité ouverte (4) et une extrémité fermée (5) et entourant un espace (16), l'arbre de moteur (2) étant traversé au moins partiellement par un tuyau d'alimentation (5) qui s'étend dans ledit espace (16) et forme une admission pour un milieu de refroidissement dans l'arbre de moteur (2), ledit tuyau d'alimentation (5) comportant au moins une ouverture (8,70) qui se trouve dans l'arbre de moteur (2) et qui est reliée par écoulement avec la partie de l'espace entourant le tuyau d'alimentation, l'arbre de moteur (2) comportant des ouvertures (11) traversantes pouvant être parcourues par le milieu de refroidissement, de la partie de l'espace vers l'extérieur, et l'ouverture ou les ouvertures (8,70) du tuyau d'admission se trouvant dans l'arbre de moteur étant agencée(s) dans une zone située entre 30 % et 70 % de la longueur axiale de l'arbre de moteur (2), cette ou ces ouverture(s) du tuyau d'admission (70) se trouvant dans l'arbre de moteur étant une extrémité ouverte du tuyau d'alimentation.
PCT/EP2021/072976 2020-08-18 2021-08-18 Ensemble arbre de moteur comprenant un arbre de moteur et un tuyau d'alimentation WO2022038204A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102020121663.7 2020-08-18
DE102020121663.7A DE102020121663A1 (de) 2020-08-18 2020-08-18 Motorwellenanordnung mit Motorwelle und Zulaufrohr

Publications (1)

Publication Number Publication Date
WO2022038204A1 true WO2022038204A1 (fr) 2022-02-24

Family

ID=77666494

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2021/072976 WO2022038204A1 (fr) 2020-08-18 2021-08-18 Ensemble arbre de moteur comprenant un arbre de moteur et un tuyau d'alimentation

Country Status (2)

Country Link
DE (1) DE102020121663A1 (fr)
WO (1) WO2022038204A1 (fr)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102016004931A1 (de) * 2016-04-23 2017-10-26 Audi Ag Elektrische Maschine sowie Verfahren zum Betreiben einer elektrischen Maschine
WO2017214232A1 (fr) * 2016-06-07 2017-12-14 Tesla, Inc. Système de refroidissement de moteur électrique
DE102018204691A1 (de) * 2018-03-27 2019-10-02 Volkswagen Aktiengesellschaft Fluidverteiler zur Fluidkühlung einer Hohlwelle
WO2020120603A1 (fr) * 2018-12-12 2020-06-18 Thyssenkrupp Ag Dispositif de rotor pour une machine électrique, ainsi que machine électrique

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102016225523A1 (de) 2016-12-20 2018-06-21 Bayerische Motoren Werke Aktiengesellschaft Elektrische Maschine, Temperierungssystem und Verfahren zur Temperierung

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102016004931A1 (de) * 2016-04-23 2017-10-26 Audi Ag Elektrische Maschine sowie Verfahren zum Betreiben einer elektrischen Maschine
WO2017214232A1 (fr) * 2016-06-07 2017-12-14 Tesla, Inc. Système de refroidissement de moteur électrique
DE102018204691A1 (de) * 2018-03-27 2019-10-02 Volkswagen Aktiengesellschaft Fluidverteiler zur Fluidkühlung einer Hohlwelle
WO2020120603A1 (fr) * 2018-12-12 2020-06-18 Thyssenkrupp Ag Dispositif de rotor pour une machine électrique, ainsi que machine électrique

Also Published As

Publication number Publication date
DE102020121663A1 (de) 2022-02-24

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