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ELECTRICAL MACHINE, IN PARTICULAR FOR A VEHICLE

  • US 20200136445A1
  • Filed: 12/27/2019
  • Published: 04/30/2020
  • Est. Priority Date: 06/27/2017
  • Status: Active Grant
First Claim
Patent Images

1. An electrical machine, in particular for a vehicle, the electrical machine comprising:

  • a rotor, which can be rotated about an axis of rotation, which defines an axial direction of the electrical machine;

    a stator, which has stator windings;

    at least one cooling duct, through which a coolant can flow;

    a coolant distributor chamber for cooling the stator windings; and

    a coolant collector chamber arranged at an axial distance to said coolant distributor chamber,wherein the coolant distributor chamber communicates fluidically with the coolant collector chamber by the at least one cooling duct, through which the coolant can flow,wherein the stator has stator teeth, which extend along the axial direction, which are arranged spaced apart from one another along a circumferential direction, and which support the stator windings,wherein least one stator winding is embedded into an electrically insulating plastic for the thermal coupling,wherein the electrically insulating plastic is arranged with at least one stator winding in at least one space, which is embodied between two stator teeth, which are adjacent in the circumferential direction,wherein the electrically insulating plastic is formed by a first plastic compound of a first plastic material, and by a second plastic compound of a second plastic material,wherein the first or/and second plastic compound at least partially surrounds at least one winding section of a stator winding, which protrudes axially from a space, and thereby partially limits the coolant distributor chamber and/or the coolant collector chamber, so that this winding section is electrically insulated with respect to the coolant during operation of the electrical machine,wherein the at least one stator winding is embedded into the first plastic compound of the first plastic material in the at least one space,wherein the first plastic compound, with the stator winding embedded therein, is at least partially surrounded by the second plastic compound of the second plastic material,wherein surface sections of the stator, which limit the space, are at least partially coated with the second plastic compound,wherein the stator is arranged axially between a first and a second bearing shield,wherein a portion of the coolant distributor chamber is arranged in a first bearing shield and the portion of the coolant collector chamber in the second bearing shield,wherein the coolant distributor chamber and the coolant collector chamber are each partially formed by a first hollow space and a second hollow space, which is provided in the first plastic compound,wherein the first hollow space is supplemented with a hollow space embodied in the first bearing shield to form the coolant distributor chamber, and the second hollow space is supplemented with the hollow space embodied in the second bearing shield to form the coolant collector chamber,wherein, in a longitudinal section along the axis of rotation, the coolant distributor chamber and the coolant collector chamber surround a first or second axial end section, respectively, of the respective stator winding in a U-shaped manner, thus axially on the end side as well as radially on the inside and radially on the outside,wherein the at least one cooling duct is arranged radially inside and at least one further cooling duct is arranged radially outside of the respective stator winding in the space,wherein at least one radially inner cooling duct is embodied as tube body, which surrounds a tube body internal space,wherein at least one separating element, which divides the tube body internal space into at least two partial cooling ducts, which are fluidically separated from one another, is molded on the tube body, andwherein, in a cross-section perpendicular to the axis of rotation, the tube body forming a radially inner cooling duct is injection molded completely with the first plastic compound, and a radially outer cooling duct is injection molded completely with the second plastic compound.

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