| 摘要 |
A lead screw type stepping motor is provided which is excellent in response and controllability, and can give accurate initial alignment. The motor comprises a case 3, and a rotor 2 rotatably supported inside a stator 1. A female threaded hole 2a is provided in the centre of the rotor 2 and a slider 6 is arranged to be engaged with the threaded hole 2a. The slider 6 is movably arranged in a guide hole 3b of the case 3, and has a slit groove 6c. A guide pin 7 is arranged to be inserted into the slit groove 6c and both ends of the guide pin 7 are press fitted to a bearing portion 3a of the case, where the guide hole 3b is provided. The pin 7 and groove 6c prevent rotation of the slider 6 and, in comparison with the shaped spindle of prior art (fig 3), provide reduced lost motion when the rotor 2 reverses its direction of rotation.
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