Abstract: A motor drive device includes a motor including a high-speed drive winding and a low-speed drive winding, a winding switching portion switching the connection states of the high-speed drive winding and the low-speed drive winding of the motor, a power conversion portion connected to the motor, and a plurality of case portions housing at least the motor, the winding switching portion, and the power conversion portion, while the plurality of case portions are coupled to each other.

Abstract: A power conversion apparatus includes a power converter and a PWM controller. A first switching element is coupled to a positive pole of a DC power source and one terminal of a load. A second switching element is coupled to a negative pole of the DC power source and another terminal of the load. A third switching element is coupled to the positive pole and the other terminal. A fourth switching element is coupled to the negative pole and the one terminal. The PWM controller PWM-controls the power conversion apparatus to repeat an on-period during which the DC power source outputs a voltage to the load and an off-period during which no voltage is output. The PWM controller alternately controls the first and second switching elements based on a signal set at a high or low level any time during a carrier wave period.

Abstract: An alternating-current/direct-current converter includes a rectifier, a reactor, a capacitor, and a switching rectifier. The rectifier is configured to rectify alternating-current voltage output from an alternating-current power source, thereby converting the alternating-current voltage into direct-current voltage, and to output the direct-current voltage. The capacitor includes terminals. The switching rectifier is coupled to the AC power source and switchable to output the direct-current voltage to the capacitor.

Abstract: A current-source power converting apparatus according to an embodiment includes an inverter and a drive controller. The inverter includes, in every output phase, a plurality of switching elements that are serially connected between the positive pole and the negative pole of a direct current source. The drive controller controls the inverter in accordance with a current command in an output mode of controlling the switching elements of different output phases for supplying current between the output phases and a short circuit mode of controlling the switching elements of the same output phase. An output phase in which the drive controller executes the short circuit mode is an output phase whose phase voltage or phase current has the minimum absolute value.

Abstract: This electronic device includes a filter circuit including a coil, a resistor, and a condenser, and a heat radiating member radiating heat generated from the coil and the resistor, arranged in proximity to the coil and the resistor of the filter circuit.

Abstract: A motor drive device includes a motor including a high-speed drive winding and a low-speed drive winding, a winding switching portion switching the connection states of the high-speed drive winding and the low-speed drive winding of the motor, a power conversion portion connected to the motor, and a plurality of case portions housing at least the motor, the winding switching portion, and the power conversion portion, while the plurality of case portions are coupled to each other.

Abstract: A power conversion apparatus includes a power converter and a PWM controller. A first switching element is coupled to a positive pole of a DC power source and one terminal of a load. A second switching element is coupled to a negative pole of the DC power source and another terminal of the load. A third switching element is coupled to the positive pole and the other terminal. A fourth switching element is coupled to the negative pole and the one terminal. The PWM controller PWM-controls the power conversion apparatus to repeat an on-period during which the DC power source outputs a voltage to the load and an off-period during which no voltage is output. The PWM controller alternately controls the first and second switching elements based on a signal set at a high or low level any time during a carrier wave period.

Abstract: This motor driving device includes a motor including a high speed drive coil and a low speed drive coil, a coil switching portion arranged in a direction along a rotating shaft of the motor with respect to the motor, a power converter arranged in a direction intersecting with the rotating shaft with respect to the motor, and a plurality of case portions storing at least the motor, the coil switching portion, and the power converter. The plurality of case portions are coupled with each other.

Abstract: This motor driving device includes a motor including a high speed drive coil and a low speed drive coil, a coil switching portion switching connection states of the high speed drive coil and the low speed drive coil of the motor, a power converter connected to the motor, and a single first case portion storing at least the motor, the coil switching portion, and the power converter.

Abstract: A current-source power converting apparatus according to an embodiment includes an inverter and a drive controller. The inverter includes, in every output phase, a plurality of switching elements that are serially connected between the positive pole and the negative pole of a direct current source. The drive controller controls the inverter in accordance with a current command in an output mode of controlling the switching elements of different output phases for supplying current between the output phases and a short circuit mode of controlling the switching elements of the same output phase. An output phase in which the drive controller executes the short circuit mode is an output phase whose phase voltage or phase current has the minimum absolute value.

Abstract: This electronic device includes a filter circuit including a coil, a resistor, and a condenser, and a heat radiating member radiating heat generated from the coil and the resistor, arranged in proximity to the coil and the resistor of the filter circuit.