Stepper motor for stable control of position of driven body e.g. vehicle lamp unit, has pressure devices arranged between housing and rotor to press rotor against housing, and protrusion pressed against rotor

摘要

The stepper motor rotates a rotor (4) in a stator (3c) depending on the magnitude of a current fed to the motor and has a housing (1,5) in which the stator is mounted, a bearing element (9) for rotatable mounting of the rotor with respect to the housing. Pressure devices (10) are arranged between the housing and the rotor to press the rotor against the housing, and a protrusion (11) is formed in a housing part and pressed against the rotor and a rotor region pressed against the housing.