Abstract: A drive device includes a motor with two sets of motor windings and a control unit. The control unit has a board on which an electronic component related to energization control of the motor windings are mounted, a connector unit, and a cover member that covers control components including the board, and is provided on one side in a axial direction of the motor. The connector unit has two main connectors and at least one sub connector used for connection with an outside, and these openings are provided so as to face a side opposite to the motor. The main connectors are connected with a power supply and a communication network. The sub connector has an opening separate from that of the main connector and is connected to a separate member.

Abstract: When a DC power source fails, the following controls are performed. The normal control is resumed when an inverter input voltage recovers before a standby period elapses after a power failure time. A power source relay is turned off when the standby period elapses without recovery of the voltage. The power source relay is turned on again when a power source relay off period has elapsed from a turn-off time. The normal control is resumed when the inverter input voltage recovers at the turn-on time. The normal control is resumed when the inverter input voltage recovers before the power source relay on period elapses from the turn-on time. The power source relay is turned off, and driving of the actuator is stopped, when the power source relay on period passes without recovery of the voltage.

Abstract: A motor case of a motor has a cylindrical portion. A motor frame is provided on one side of the cylindrical portion in an axial direction. A control unit has at least one board and a connector unit and is arranged on one axial side of the motor. The connector unit has at least one connector erected from the base portion with a frontage facing outward in the axial direction of the motor. An extension member is secured to the motor case. A cover having a hole through which the connector is inserted and fixed to the extension member. The extension member is formed to extend to an outside of a projected area in which the cylindrical portion of the motor case is projected in an axial direction.

Abstract: A power relay unit includes a high potential side relay connected so that an anode of a parasitic diode is on a high potential side and a cathode is on a low potential side, and a low potential side relay connected in series with a low potential side of the high potential side relay so that a cathode of a parasitic diode is on a high potential side and an anode is on a low potential side. A relay-to-relay connection line connects an intermediate point between the first high potential side relay and the first low potential side relay and an intermediate point between the second high potential side relay and the second low potential side relay. A control unit controls an on/off operation of the first high potential side relay based on a first supply voltage, a second supply voltage, and a relay intermediate voltage.

Abstract: A drive device includes an electric motor and a control unit which are integrated together. The control unit is configured to control the electric motor by using an electric power supply and a signal supplied through an external cable. The control unit includes: a parent circuit board, which is installed to the electric motor; and a connector module, which is configured to connect the parent circuit board to an external connector of the external cable. The connector module includes: a connector portion that is configured to be coupled with and decoupled from the external connector; a wiring module that is configured to receive the electric power supply and the signal from the external cable through the connector portion; and a plurality of connecting conductors that electrically connect the wiring module to the parent circuit board.

Abstract: A power relay unit includes a high potential side relay connected so that an anode of a parasitic diode is on a high potential side and a cathode is on a low potential side, and a low potential side relay connected in series with a low potential side of the high potential side relay so that a cathode of a parasitic diode is on a high potential side and an anode is on a low potential side. A relay-to-relay connection line connects an intermediate point between the first high potential side relay and the first low potential side relay and an intermediate point between the second high potential side relay and the second low potential side relay. A control unit controls an on/off operation of the first high potential side relay based on a first supply voltage, a second supply voltage, and a relay intermediate voltage.

Abstract: A substrate is fixed to a housing. Heating elements are mounted on a surface of the substrate on the housing-side. A radiating component is provided between the heating elements and the housing. A surface of the housing on the substrate-side includes accommodating recesses, a partitioning wall part, a peripheral wall part, and buffer parts. In each of the accommodating recesses, a corresponding one of the heating elements is accommodated. The partitioning wall part separates the heating elements from each other. The peripheral wall part surrounds the accommodating recesses and the partitioning wall part. Each of the buffer parts is formed between a corresponding one of the accommodating recesses and the peripheral wall part. Each of the buffer parts is formed to be higher than a bottom part of a corresponding one of the accommodating recesses, and to be lower than the peripheral wall part.

Abstract: A substrate is fixed to a housing. Heating elements are mounted on a surface of the substrate on the housing-side. A radiating component is provided between the heating elements and the housing. A surface of the housing on the substrate-side includes accommodating recesses, a partitioning wall part, a peripheral wall part, and buffer parts. In each of the accommodating recesses, a corresponding one of the heating elements is accommodated. The partitioning wall part separates the heating elements from each other. The peripheral wall part surrounds the accommodating recesses and the partitioning wall part. Each of the buffer parts is formed between a corresponding one of the accommodating recesses and the peripheral wall part. Each of the buffer parts is formed to be higher than a bottom part of a corresponding one of the accommodating recesses, and to be lower than the peripheral wall part.

Abstract: In an electronic control device, semiconductor modules are disposed in a power region of a substrate, and on a surface of a substrate adjacent to a housing to radiate heat from rear surfaces to the housing through a heat radiation layer. Therefore, a heat radiation performance improves. Further, a first distance from an end surface of a power region corresponding part corresponding to the power region to the substrate is shorter than a second distance from an end surface of a control region corresponding part corresponding to a control region of the substrate to the substrate. Therefore, a closed circuit bridged by parasitic capacitances is formed mainly in an area of the power region and the power region corresponding part. A noise generated from the semiconductor modules is returned to noise sources through the closed circuit without affecting the control region.

Abstract: In an electronic control device, semiconductor modules are disposed in a power region of a substrate, and on a surface of a substrate adjacent to a housing to radiate heat from rear surfaces to the housing through a heat radiation layer. Therefore, a heat radiation performance improves. Further, a first distance from an end surface of a power region corresponding part corresponding to the power region to the substrate is shorter than a second distance from an end surface of a control region corresponding part corresponding to a control region of the substrate to the substrate. Therefore, a closed circuit bridged by parasitic capacitances is formed mainly in an area of the power region and the power region corresponding part. A noise generated from the semiconductor modules is returned to noise sources through the closed circuit without affecting the control region.

Abstract: A substrate of an electronic control unit has a control region on which a control component is disposed and a power region on which a power component is disposed. Substrate-fixing portions of a housing project from a bottom portion, and the substrate is fixed to the substrate-fixing portions. A heat radiating portion extends from the bottom portion. Semiconductor modules are fixed to a first outer surface and a second outer surface of the heat radiating portion, the first outer surface being on a side opposite to the power component. The heat radiating portion is located between the semiconductor modules and the power component. Therefore, heat interference between the semiconductor modules and the power component is reduced, and a heat radiation performance improves.

Abstract: There is disclosed a method and apparatus for rounding numerals according to the number of significant digits or a rounding interval. The method starts with entering a numerical value x to be rounded and the number of significant digits n or a rounding interval w. The entered numerical value x is stored in a first storage portion of the apparatus. The entered number of significant digits n or rounding interval w is stored in a second storage memory. The numerical value x stored in. the first storage portion is rounded in a digit place determined by the number of significant digits n or rounding interval w stored in the. second storage portion. The numerical value x is rounded while using the number of significant digits n or rounding interval w as it is.