A motor includes: an electrically conductive case; a shaft stored in the case and placed such that a part of the shaft penetrates the case; and a bearing via which the shaft is rotatably attached to the case. The shaft has an electrically conductive shaft material, and a high-resistance layer covering a surface of the shaft material and having a higher electric resistance than the shaft material.

A motor includes: an electrically conductive case; a shaft stored in the case and placed such that a part of the shaft penetrates the case; and a bearing via which the shaft is rotatably attached to the case. The shaft has an electrically conductive shaft material, and a high-resistance layer covering a surface of the shaft material and having a higher electric resistance than the shaft material.

An embodiment relates to a controller and a motor assembly comprising same, the controller comprising: a substrate; a controller housing disposed on the substrate; a CM filter unit disposed between the substrate and the controller housing; a DM filter unit disposed under the CM filter unit; a controller cover disposed between the substrate and the DM filter unit; a power module unit disposed between the substrate and the controller cover; and a connector unit coupled to the substrate, wherein the power module unit comprises a power module and a mold unit surrounding the power module. Accordingly, the heat generating problem of the power module unit can be resolved.

An embodiment relates to a controller and a motor assembly comprising same, the controller comprising: a substrate; a controller housing disposed on the substrate; a CM filter unit disposed between the substrate and the controller housing; a DM filter unit disposed under the CM filter unit; a controller cover disposed between the substrate and the DM filter unit; a power module unit disposed between the substrate and the controller cover; and a connector unit coupled to the substrate, wherein the power module unit comprises a power module and a mold unit surrounding the power module. Accordingly, the heat generating problem of the power module unit can be resolved.

Air circulation passages connect an accommodation space of an electronic control unit to the outside to circulate air to buffer internal pressure fluctuations. The accommodation space side of the air circulation passages is formed as a divided air circulation passage with a plurality of passages, a cooling object member is arranged to come in thermal contact with air flowing through the divided air circulation passage, and the total cross-sectional area of the divided air circulation passage is smaller than the cross-sectional area of the air circulation passages that are not divided. Because the accommodation space of the electronic control unit is connected to the outside, internal pressure fluctuations can be buffered, and increasing the flow velocity of the air flowing through the divided air circulation passage on the accommodation space side of the air circulation passages allows heat inside the accommodation space to be efficiently radiated to the outside.

A molded product in which a parting line can be disposed at an inconspicuous position on the appearance of the product. The molded product includes a main body having a cylindrical shape and a hole penetrating through the main body in a radial direction, or a protrusion protruding in the radial direction from the main body, and in the molded product, a parting line corresponding to a matching surface of molds is formed in the molded product, and the parting line has a first line extending from the hole or the protrusion to one side in a circumferential direction of the main body, and a second line extending from an end point on the one direction of the circumferential direction of the first line to an end portion in an axial direction of the main body.

An electric actuator includes a motor which has a rotor having a motor shaft extending along a central axis and a stator facing the rotor in a radial direction, a motor case for housing the motor, and a deceleration mechanism coupled to one axial side of the motor shaft. The motor case has a case cylinder portion, a lid for covering, and a plurality of screws. The case cylinder portion has a plurality of screw fixing portions. The lid has a top plate portion, an outer cylinder portion which surrounds the case cylinder portion from a radial outer side, an annular groove portion, and a seal member which seals the opening portion of the case cylinder portion. In the lid, an axial thickness of a region which overlaps the annular groove portion as viewed in the axial direction is larger than an axial thickness of the top plate portion.

An electric actuator includes a motor which has a rotor having a motor shaft extending along a central axis and a stator facing the rotor in a radial direction, a motor case for housing the motor, and a deceleration mechanism coupled to one axial side of the motor shaft. The motor case has a case cylinder portion, a lid for covering, and a plurality of screws. The case cylinder portion has a plurality of screw fixing portions. The lid has a top plate portion, an outer cylinder portion which surrounds the case cylinder portion from a radial outer side, an annular groove portion, and a seal member which seals the opening portion of the case cylinder portion. In the lid, an axial thickness of a region which overlaps the annular groove portion as viewed in the axial direction is larger than an axial thickness of the top plate portion.

An electrical machine comprises a stator and a housing. The housing has an internal bore. The stator comprises an annular core mounted within the bore of the housing. The core comprises at least one key projecting radially outwardly from a radially outer surface thereof. The housing comprises at least one keyway in the bore. The at least one key of the core being received within the at least one keyway of the housing.

A controller including a first housing; a first cover disposed on an opening of the first housing; filter units disposed above the first cover; a power module unit disposed below the first cover; and a substrate disposed below the power module unit; wherein the power module unit includes a bracket; and a power module disposed between the bracket and the first cover, and wherein the power module includes a power module body; a plurality of first pins arranged to protrude downward from one side of the power module body; and five terminal pins arranged to protrude downward from the other side of the power module body, wherein an end portion of the first pin is coupled to the substrate.