Abstract: A position detection device includes a motor that rotates a drive target, a periodic sensor that detects a plurality of periods included in a periodic change generated by rotation of the motor, an origin sensor that detects an origin of the motor in a rotation direction, and a controller that controls the rotation of the motor based on signals output from each of the periodic sensor and the origin sensor. A repeated detection error in detecting the origin by the origin sensor is smaller than a rotation range of the motor corresponding to each period of the plurality of periods detected by the periodic sensor.

Abstract: The air discharge device includes a duct defining: a main flow path through which an air flow passes; and a main hole opened in a flat shape to discharge the air flow as a working air flow toward a downstream from the main flow path. A throttle portion is provided in the duct to reduce a flow path height of the main flow path from an upstream of the air flow toward a downstream of the air flow. A plurality of partitions are arranged to divide the main flow path in a major direction into a pair of side flow paths and at least one center flow path. The plurality of partitions are disposed in the duct such that a flow path width of the center flow path is reduced from the upstream of the air flow toward the downstream of the air flow.

Abstract: A protection device is capable of protecting a load drive system at an appropriate timing according to a temperature of a power semiconductor. The protection device includes: a capacitor configured to output a voltage according to a charge accumulated by a first current; and a protection circuit configured to: (i) determine whether or not the voltage output by the capacitor exceeds a certain threshold value; (ii) generate a second current having a magnitude according to information related to the temperature of the power semiconductor which drives a load; and (iii) change a magnitude of the first current based on the second current.

Abstract: There is provided a protection device capable of protecting a load drive system at an appropriate timing according to the temperature of a power semiconductor. A protection device includes: a capacitor that outputs a voltage according to a charge accumulated by a first current; and a protection circuit that determines whether or not the voltage output by the capacitor exceeds a certain threshold value, generates a second current having a magnitude according to information related to the temperature of a power semiconductor which drives a load, and changes the magnitude of the first current based on the generated second current.