Mounting Arrangement for Permanent Magnet Stepper Motor
Original Publication Date: 1984-Nov-01
Included in the Prior Art Database: 2005-Feb-05
A permanent magnet stepper motor eliminates the requirement for a shaft groove and a ring or clip in the groove to retain the motor's rotor in position in cooperation with a bearing. A rotor shaft 1 has a magnet 2 attached thereto through a plastic web 3 to function as the rotor of the motor. A sintered bronze oil-impregnated bushing 4, which functions as a bearing, is pressed into a mounting plate 5, which supports coils 6 of the motor. The rotor shaft 1 receives the bushing 4 in the mounting plate 5 prior to a gear 7 being pressed onto the rotor shaft 1. The bushing 4 has the gear 7 bearing thereagainst to control the end play of the rotor.