Electric drive device and electric power steering device

An electric drive device comprising:

• a motor housing accommodating therein an electric motor that drives a mechanical control element;
• and
• an electronic control unit provided at an end surface portion side of the motor housing which is an opposite side to an output shaft portion of a rotation shaft of the electric motor, the electronic control unit having a control circuit unit, a power supply circuit unit, a power conversion circuit unit, which are configured to drive the electric motor, and a connector case to which a power supply is connected for power supply to the power supply circuit unit, wherein
• a power-conversion-circuit heat releasing section and a power-supply-circuit heat releasing section are formed at the end surface portion of the motor housing, and the power conversion circuit unit is set on the power-conversion-circuit heat releasing section and the power supply circuit unit is set on the power-supply-circuit heat releasing section,
• the control circuit unit is mounted on a circuit board for the control circuit unit and the power supply circuit unit is mounted on a circuit board for the power supply circuit unit, and each of the circuit boards is set in a radial direction orthogonal to the rotation shaft of the electric motor so as to be stacked in a direction of the rotation shaft of the electric motor,
• the connector case has a power supplying-side terminal structured to supply power to the power supply circuit unit, and the power supply circuit unit has a power receiving-side terminal structured to receive the power from the power supplying-side terminal for power supply to the power supply circuit unit mounted on the circuit board for the power supply circuit unit,
• the power supplying-side terminal has:
• a power supplying-side hanging portion that extends toward a surface of the circuit board of the power supply circuit unit;
• a power supplying-side extending portion that is bent from the power supplying-side hanging portion and extends outwards along the surface of the circuit board of the power supply circuit unit;
• and
• a power supplying-side standing portion that is bent from the power supplying-side extending portion and extends in a direction away from the circuit board of the power supply circuit unit,
• the power receiving-side terminal has:
• a power receiving-side extending portion that is connected to a wiring pattern of the circuit board of the power supply circuit unit and extends outwards along the surface of the circuit board of the power supply circuit unit;
• and
• a power receiving-side standing portion that is bent from the power receiving-side extending portion and extends in the direction away from the circuit board of the power supply circuit unit,
• the power supplying-side terminal and the power receiving-side terminal are arranged so that the power supplying-side extending portion and the power receiving-side extending portion overlap each other when viewed in an axial direction of the electric motor, with the power supplying-side extending portion and the power receiving-side extending portion being separate from each other in the axial direction of the electric motor, and
• the power supplying-side standing portion and the power receiving-side standing portion overlap each other, and are connected to each other so as to have electrical continuity.

An electric power steering device comprising:

• an electric motor providing a steering assistive force to a steering shaft on the basis of an output from a torque sensor that detects a turning direction and a turning torque of the steering shaft;
• an aluminum-based metal-made motor housing accommodating therein the electric motor;
• an electronic control unit provided at an end surface portion side of the motor housing which is an opposite side to an output shaft portion of a rotation shaft of the electric motor, the electronic control unit having a control circuit unit, a power supply circuit unit, and a power conversion circuit unit, which are configured to drive the electric motor, and a connector case to which a power supply is connected for power supply to the power supply circuit unit;
• and
• a metal-made metal cover covering the electronic control unit, wherein
• a power-conversion-circuit heat releasing section and a power-supply-circuit heat releasing section are formed at the end surface portion of the motor housing, and the power conversion circuit unit is set on the power-conversion-circuit heat releasing section and the power supply circuit unit is set on the power-supply-circuit heat releasing section,
• the control circuit unit is mounted on a circuit board for the control circuit unit and the power supply circuit unit is mounted on a circuit board for the power supply circuit unit, and each of the circuit boards is set in a radial direction orthogonal to the rotation shaft of the electric motor so as to be stacked in a direction of the rotation shaft of the electric motor,
• the connector case has a power supplying-side terminal structured to supply power to the power supply circuit unit, and the power supply circuit unit has a power receiving-side terminal structured to receive the power from the power supplying-side terminal for power supply to the power supply circuit unit mounted on the circuit board for the power supply circuit unit,
• the power supplying-side terminal has:
• a power supplying-side hanging portion that extends toward a surface of the circuit board of the power supply circuit unit;
• a power supplying-side extending portion that is bent from the power supplying-side hanging portion and extends outwards along the surface of the circuit board of the power supply circuit unit;
• and
• a power supplying-side standing portion that is bent from the power supplying-side extending portion and extends in a direction away from the circuit board of the power supply circuit unit,
• the power receiving-side terminal has:
• a power receiving-side extending portion that is connected to a wiring pattern of the circuit board of the power supply circuit unit and extends outwards along the surface of the circuit board of the power supply circuit unit;
• and
• a power receiving-side standing portion that is bent from the power receiving-side extending portion and extends in the direction away from the circuit board of the power supply circuit unit,
• the power supplying-side terminal and the power receiving-side terminal are arranged so that the power supplying-side extending portion and the power receiving-side extending portion overlap each other when viewed in an axial direction of the electric motor, with the power supplying-side extending portion and the power receiving-side extending portion being separate from each other in the axial direction of the electric motor, and
• the power supplying-side standing portion and the power receiving-side standing portion overlap each other, and connected to each other so as to have electrical continuity.