Abstract: A water draining structure for a built-in type motor to be integrally mounted on an automotive throttle body, having a mounting member including a housing of a driven device and having a confined chamber formed between itself and a motor mounted integrally thereon, and a water draining hole formed in its bottom for providing communication between the chamber and the atmosphere. The water draining structure consists of at least one water cutting rib disposed in close proximity to the water draining hole and projected outward from the shell of the mounting member. Water having splashed on the motor or the mounting member can be cut by the water cutting rib so that an excellent drainage can be always retained while keeping the water draining hole vented to the atmosphere. As a result, the motor can be prevented from having its function decreased even if it is used under a sever environmental condition, so that its durability can be effectively improved.

Abstract: A stator in a step motor comprising first and second supports, and conductive connecting members each having one end connected to any one of a plurality of terminal wires of a stator coil and the other end connected to a driving power supply harness adapted for supplying driving power to the stator coil and having the same driving power supply voltage polarity as the terminal wire. The connecting members are divided according to their driving power supply voltage polarities into groups which are mounted separately to the first and second supports. The first and second supports are disposed on the outer periphery of the stator with a maximum space therebetween.

Abstract: A step motor of the linear type has a shaft threadedly engaged with an inner hole of a rotor and is slidably supported for axial movement by a front bearing and a rear bearing. A stopper pin that abuts on a stationary portion at the rear end of travel projects from an outer circumferential portion of the shaft. The shaft is moved in the axial direction by the rotation of the rotor and the front shaft bearing is provided with a slot allowing the stopper pin to pass through. Consequently, when the shaft is advanced, the stopper pin for stopping the rear end of travel does not abut on the front bearing, and the advance of the shaft is not limited. The slot, therefore, allows the stroke of the shaft to be lengthened without lengthening the front portion of the housing.