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DE-102024210797-A1 - Gas supply device

DE102024210797A1DE 102024210797 A1DE102024210797 A1DE 102024210797A1DE-102024210797-A1

Abstract

The invention relates to a gas supply device (1) with an electric motor drive comprising a stator surrounded by a temperature control device. In order to improve the gas supply device (1) functionally and/or in terms of manufacturing technology, the stator comprises at least one stator lamination stack with temperature control channels which serve to carry a temperature control medium for temperature control of the stator and which run in the stator lamination stack, for example, parallel to a rotor axis of rotation, wherein the temperature control channels in the stator lamination stack are lined with a covering impermeable to the temperature control medium in such a way that no temperature control medium enters between the stator laminations in an undesirable manner.

Inventors

  • Jochen Wessner
  • Bo Zhang

Assignees

  • Robert Bosch Gesellschaft mit beschränkter Haftung

Dates

Publication Date
20260513
Application Date
20241111

Claims (10)

  1. Gas supply device (1) with an electric motor drive (30) comprising a stator (33) surrounded by a temperature control device (34), characterized in that the stator (33) comprises at least one stator lamination stack (40) comprising stator laminations (41, 42, 43) with temperature control channels (44, 45; 80) which serve to carry a temperature control medium for temperature control of the stator (33) and which run in the stator lamination stack (40) for example parallel to a rotor axis of rotation (32), wherein the temperature control channels (44, 45; 80) in the stator lamination stack (40) are lined with a covering (47) impermeable to the temperature control medium in such a way that no temperature control medium enters between the stator laminations (41, 42, 43) in an undesirable manner.
  2. Gas supply device (1) according to Claim 1 , characterized in that the casing (47) comprises an overmolding (79) made of a plastic material that is impermeable to the temperature control medium.
  3. Gas supply device (1) according to one of the preceding claims, characterized in that at least one temperature control channel (44) in the stator lamination stack (40) has a temperature control channel geometry (55) that is radially open to the outside with respect to the stator laminations (41, 42, 43).
  4. Gas supply device(1) according to one of the preceding claims, characterized in that the stator laminations (41,42,43) have a material dimension (66) which is at least half a tooth root width (65) for reasons of stability and/or for a virtually lossless guidance of a magnetic flux in the operation of the electromotive drive in the area of the temperature control channel geometry (54,55) transverse to the rotor axis of rotation (32).
  5. Gas supply device (1) according to one of the preceding claims, characterized in that at least one temperature control channel (44,45) for the temperature control medium in the stator lamination stack (40) has a trapezoidal passage cross-section which, with respect to the stator laminations (41,42,43), widens radially outwards.
  6. Gas supply device (1) according to one of the preceding claims, characterized in that at least one temperature control channel (44,45) in the stator lamination stack (40) has a temperature control channel geometry (54) that is closed transversely to the rotor rotation axis (32) with respect to the stator laminations (41,42,43).
  7. Gas supply device (1) according to one of the preceding claims, characterized in that the temperature control device comprises a temperature control sleeve (50) with temperature control channels (35-39) which are connected to the temperature control channels (35-39) in the stator lamination stack (40) by means of at least one connection device (70) which is impermeable to the temperature control medium.
  8. Gas supply device (1) according to Claim 7 , characterized in that the connecting device (70) is integrally connected to the sheathing (47,48) of the temperature control channels (44,45) in the stator lamination stack (40), which is impermeable to the temperature control medium.
  9. Gas supply device (1) according to one of the Claims 7 until 8 , characterized in that the connecting device (70) is assigned to a winding head (51,52) of the stator (33) for temperature control purposes.
  10. Gas supply device (1) according to one of the Claims 7 until 9 , characterized in that the connecting device (70) is connected to a connecting recess (73) in at least one stator lamination (43), wherein the connecting recess (73) opens a cooling channel geometry (56) of a cooling channel in the stator lamination (43) radially outwards towards the cooling device (34).

Description

The invention relates to a gas supply device with an electric motor drive comprising a stator surrounded by a temperature control device. State of the art The German Disclosure Notice DE 10 2022 202 886 A1 Disclosing a gas supply device with a shaft rotatably mounted in a housing about an axis of rotation, and with a temperature control device comprising medium temperature control surrounding the shaft, combined with gas temperature control, wherein the temperature control device comprises a temperature control sleeve with a first radially outwardly open temperature control channel geometry designed for guiding the flow of a temperature-controlled medium, and a gas temperature control ring for temperature control of gas, provided with a second radially outwardly open temperature control channel geometry, which radially inwardly and/or axially limits the first temperature control channel geometry and radially outwardly is limited by a housing body. The German patent application DE 10 2019 114 264 A1 Disclosing a stator for a brushless DC motor comprising a stator core with a plurality of stacked stator laminations, each having an annular surface and a plurality of stator teeth, wherein the stator teeth are arranged uniformly spaced circumferentially around a longitudinal axis of the stator and each has a tooth root and a tooth head, wherein currentable windings are arranged on the tooth roots of the stator core to form coils, wherein the stator core is formed from three different types of stator laminations having partially corresponding openings that cooperate to form a plurality of cooling channels, each of the cooling channels extending substantially parallel to the longitudinal axis from one end of the stator core to another end of the stator core. Disclosure of the invention The object of the invention is to improve, functionally and/or in terms of manufacturing technology, a gas supply device with an electric motor drive comprising a stator surrounded by a temperature control device. The problem is solved in a gas supply device with an electric motor drive comprising a stator surrounded by a temperature control unit by the fact that the stator includes at least one stator lamination stack with temperature control channels for conveying a temperature control medium to maintain the stator's temperature. These channels run, for example, parallel to a rotor axis of rotation within the stator lamination stack, and are lined with a sheathing impermeable to the temperature control medium to prevent any undesired ingress of the medium between the stator laminations. The gas supply device is, in particular, an air supply device. The air supply device is, for example, designed as a compressor used in a fuel cell system to provide compressed air. The electric motor drive of the air supply device preferably comprises an electric motor with a stationary stator in which a rotor is rotatably arranged about an axis of rotation. The temperature control unit can be operated with a liquid temperature control medium. The temperature control device is advantageously fluidically connected to the temperature control channels in the stator lamination stack. (From the German patent application) DE 10 2019 114 264 A1 In a known stator, a liquid temperature control medium, such as oil, is used. Considerations undertaken within the scope of the present invention have included the possibility of using a gas, such as air, as the temperature control medium. If a gas, such as air, is used for temperature control, the claimed preferably gas-impermeable lining of the temperature control channels in the stator lamination stack prevents the unwanted ingress of the gaseous medium into the spaces between the stator laminations. A preferred embodiment of the gas supply device is characterized in that the casing comprises an overmolding made of a plastic material impermeable to the temperature control medium. This overmolding significantly simplifies the production of the impermeable casing for the temperature control channels in the stator lamination stack. The plastic material impermeable to the temperature control medium is preferably an elastic plastic material, such as silicone. Another preferred embodiment of the gas supply device is characterized in that at least one cooling channel in the stator lamination stack has a cooling channel geometry that is radially open to the outside with respect to the stator laminations. The stator laminations comprise a preferably substantially annular stator base body, which is also referred to as the stator yoke. The cooling channels, with their radially open geometry, can be connected particularly easily to the cooling device surrounding the stator within this stator base body. Another preferred embodiment of the gas supply device is characterized in that, for reasons of stability and/or to ensure virtually loss-free guidance of a magnetic flux during operation of the electric motor drive, the stato