Abstract: A sensor apparatus which can accurately detect a fault due to poor connection or the like at a connection portion between a sensor portion and a control portion. The sensor apparatus is provided with a sensor portion and a control portion which is electrically connected to the sensor portion via a power supply line, an output line and a ground line. The control portion includes a switch and the diagnosis circuit. The switch switches the power supply to the sensor portion to one of the power supply line and the output line. When the power is supplied to the output line, the diagnosis circuit measures current flowing from the output line to the ground line, and detects the fault by comparing the measured current with a reference voltage value.

Abstract: In a brushless motor apparatus, a rotor is rotatbly supported on a stator so that the rotor is rotated by energization of the stator. The stator has a center piece that has a fixing plate at one end. The fixing plate is formed with bosses. Each boss is fixed to a motor holder through a vibration-resistricting cushion. The cushion is shaped cylindrically to be fit tightly on the boss. The cushion is formed with an annular groove on its outer peripheral surface at a position intermediate its axial ends, and is fit tightly in an elliptic fixing hole formed in the motor holder through the annular groove. The cushion has an abutting surface on its inner peripheral wall at the intermediate position so that the cushion abuts the boss at the abutting surface. The abutting surface has an axial length shorter than the entire axial length of the cushion. The cushion is held tightly to the fixing plate by threading a holding plate to the fixing plate in the axial direction.