Motor
Summary:
The "Sangamo" self-starting synchronous electric motor
Patent Dates
Application Date:
1931-01-19 Issue Date:
1933-11-07
Patent Numbers
Patent Number:
1933591 Serial Number:
509564
Notes:
This is the Sangamo self-starting synchronous motor, used in Westclox clocks up to ca. 1940, and used in Seth Thomas strike or chime clocks until ca. 1949.
Description:
Has 2 rotors on one shaft: induction rotor provides starting and running torque, permanently magnetized rotor maintains synchronism with the A/C and limits the speed of the induction rotor.
Inventor Information:
Frederick C. Holtz and Fred Kurz, Springfield, Ill., assignors to Sangamo Electric Company, Springfield, Ill., a corporation of Illinois
Patent Type:
Utility
Patent Country:
United States
Patent Category:
Clock Synchronous Motor
Patent Companies
Assignee:
Sangamo Electric Company User:
Seth Thomas User:
Westclox
Patent Personnel
Inventor:
Holtz, Frederick Inventor:
Kurz, Fred
Patent URLs:
U.S. Patent Database; Google Patents
