Electric motor device
AssigneeDenso Corporation
InventorsMasashi YAMASAKI, Hiroshi IMAI, Katsuji KAWAI
Life of this patent
Estimating the term…
Abstract
A power module for supplying driving current to coils wound on a stator of an electric motor and a heat sink for absorbing heat generated at the power module are provided at an axial outside of a motor casing. An intermediate member is provided between the motor casing and the heat sink. The intermediate member has a bottom plate portion fixed to an axial end plate of the motor casing and a cylindrical side wall axially extending from the bottom plate portion. An outer peripheral surface of the heat sink is in contact with an inner peripheral surface of the cylindrical side wall, so that the power module fixed to the heat sink is arranged in a space, which is within a range smaller than an outer diameter of the motor casing.
Claims17
An electric motor device comprising:
- a motor casing having a cylindrical wall portion and an axial end plate extending from one axial end of the cylindrical wall portion in a radial and inward direction;
- a stator fixed to an inner peripheral surface of the motor casing;
- a rotor rotatably supported in the motor casing so that the rotor is rotated in the stator;
- a power module provided at an outside of the motor casing at one axial end of a rotating shaft of the rotor for supplying driving current to coils wound on the stator and/or the rotor;
- a heat sink provided at the outside of the motor casing, the power module being fixed to the heat sink so that heat generated at the power module is absorbed by the heat sink;
- and
- an intermediate member provided between the motor casing and the heat sink,
- wherein the intermediate member has a bottom plate portion fixed to the axial end plate of the motor casing and a side wall axially extending from the bottom plate portion in a direction opposite to the motor casing,
- an upper end of the side wall is in contact with the heat sink, and
- the intermediate member is arranged in a space, which is not larger than a size of the motor casing in its radial direction.
An electric motor device comprising:
- a motor casing having a cylindrical wall portion and an axial end plate extending from one axial end of the cylindrical wall portion in a radial inward direction;
- a stator fixed to an inner peripheral surface of the motor casing;
- a rotor rotatably supported in the motor casing so that the rotor is rotated in the stator;
- a power module provided at an outside of the motor casing at one axial end of a rotating shaft of the rotor for supplying driving current to coils wound on the stator and/or the rotor;
- a heat sink provided at the outside of the motor casing, the power module being fixed to the heat sink so that heat generated at the power module is absorbed by the heat sink;
- a fixing means for fixing the heat sink to the axial end plate of the motor casing;
- and
- a holder plate provided in the motor casing between the axial end plate and the stator or the rotor,
- wherein the holder plate prevents any extraneous material, which is produced when the heat sink is fixed to the motor casing by the fixing member, from coming into the inside of the stator or the rotor.
Dependencies are inferred from the claim text.