A combined motor and gearbox assembly for an electric power steering system comprising an electric motor, a gearbox which includes a gearset that is connected on an input part to a rotor of the motor and in use is connected on an output part at least indirectly to a steering column shaft to transfer torque from the motor rotor to the steering column shaft, a motor drive circuit, a gearbox housing which in use accommodates the gearset of the gearbox, the electric motor including a motor housing, and a baseplate which connects an end face of the gearbox housing to an end face of the gearbox housing and which supports the drive circuit. At least one bolt having a stem passes through a central hole in a tubular rivet that secures the motor housing to the baseplate, the bolt securing the baseplate to the gearbox housing.

Heat radiation base body 23 that is adjacent to electric motor unit EM and extends in direction of rotation shaft 50 of electric motor is provided close to rotation shaft 50 of electric motor. Board 24 of one electronic control unit of redundant system is fixed to heat radiation base body along direction in which heat radiation base body 23 extends with thermal conduction to heat radiation base body 23 allowed. Board 26 of the other electronic control unit of redundant system is fixed to heat radiation base body so as to face to board 24 of one electronic control unit of redundant system, with thermal conduction to heat radiation base body 23 allowed. Size reduction of electric drive device in radial direction can be achieved. Since heat radiates to housing of electric motor unit through heat radiation base body, heat from board can radiate efficiently to the outside.

An electric power-steering control device has a substrate, a heat-generating component, and a heat-storing body. The heat-generating component is disposed on one surface of the substrate and generates heat when activated. The heat-storing body is capable of storing the heat from the heat-generating components. The heat-storing body has a main body having a rectangular plate shape and disposed on the one surface of the substrate. The heat-storing body has a notch section or a recess section.

According to this invention, provided is an electric power steering device, including: a motor having a winding; and a control unit configured to control the motor, the motor and the control unit being integrated with each other in alignment with each other in an axial direction of a rotary shaft of the motor. The winding of the motor includes a winding end portion configured to receive a current supplied thereto. The control unit includes: a current supply circuit, which includes a supply terminal, and is configured to supply the current to the winding end portion; an extension member connected to the supply terminal; and a first connection portion at which the extension member and the winding end portion are connected to each other. The first connection portion is arranged on a radially outer side of the motor with respect to the current supply circuit.

A motor includes a rotor including an axially extending shaft, a stator, a housing, a heat sink disposed axially above the stator, a board fixed axially above the heat sink, a connector disposed radially outside the housing, and a connector pin accommodated in the connector. The heat sink includes a main body, and a protrusion which is continuous with the main body, the protrusion extending radially outward of the housing. The connector, the protrusion, and the board overlap in this order when viewed from axially below. The connector pin is positioned radially outside the protrusion.

An inductor device, a filter device, and a steering system. The inductor device includes first to third cores and first and second wires. The first core, a portion of the first wire passing through the first core, and a portion of the second wire passing through the first core are provided as a first inductor. The second core and another portion of the first wire passing through the second core are provided as a second inductor. The third core and another portion of the second wire passing through the third core are provided as a third inductor.

An electronic control unit is provided for an electric power steering system. The electric power steering system includes a housing and an electric motor. The electronic control unit is arranged inside the housing and is electrically connected to the electric motor. The electronic control unit includes a first power board having a first electric motor connector for electric connection with the electric motor, and a second power board having a second electric motor connector for electric connection with the electric motor. A connector plate of the electronic control unit is electrically connected by at least one plug connector to the first power board via at least one first power connector, and to the second power board via at least one second power connector. The at least one first power connector is shorter than the at least one second power connector. An electric power steering system is also provided.

An electronic control unit is provided for an electric power steering system. The electric power steering system includes a housing and an electric motor, and the electronic control unit is arranged inside the housing with an electrical connection to the electric motor. The electronic control unit includes at least one power board and a heat sink. The at least one power board is attached to the heat sink. A heat sink edge of the heat sink includes a groove, into which at least a portion of the housing is crimped to secure the heat sink with the housing. The electric power steering system is also provided.

An electronic control unit is provided for an electric power steering system. The electric power steering system includes a housing and an electric motor. The electronic control unit is arranged inside the housing, and is electrically connected to the electric motor. The electronic control unit includes a first power board having a first electric motor connector for electric connection with the electric motor, and a second power board having a second electric motor connector for electric connection with the electric motor. The electronic control unit also includes a logic board logically connected with the first power board and the second power board. An electric power steering system is also provided.

An electric driving device and an electric power steering device. An electric driving device includes a motor and an electronic control unit that controls rotation of the motor. The electronic control unit includes a first circuit board, a second circuit board, a second housing, a lid, and an inter-board connector. The second circuit board includes a control circuit that controls an electric current supplied to a transistor of the first circuit board. The second housing accommodates the second circuit board and has a first through hole passing therethrough in the axial direction. The lid covers the second housing. The inter-board connector connects the second circuit board disposed on the anti-load side of the second housing to the first circuit board disposed on the load side of the second housing. The inter-board connector is disposed in the first through hole.