Title:
ROTOR STRUCTURE OF STEP MOTOR FOR TIMEPIECE
Document Type and Number:
Japanese Patent JPS57116571
Kind Code:
A
Abstract:
PURPOSE:To reduce the inertial moment of a rotor of a step motor for a watch by forming a plurality of holes at the periphery of the central hole of a rotor seat, thereby reducing the weight of the rotor seat. CONSTITUTION:A rotor seat 2 made of aluminum series material is formed with a curved or tapered surface for facilitating the press-fitting of a rotor magnet 1 made of intermetallic compound and a central hole to which the shaft of a rotor rotating shaft 3 is press-fitted. A plurality of escape holes 4 are formed in balancedly to reduce the inertial moment of the rotor seat 2 from the lower surface of the outer periphery of the central hole of the rotor seat 2.
Inventors:
NOMURA HIRONORI
Application Number:
JP349381A
Publication Date:
July 20, 1982
Filing Date:
January 13, 1981
Export Citation:
Assignee:
CITIZEN WATCH CO LTD
International Classes:
H02K1/27; (IPC1-7): H02K21/08