The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Feb. 03, 1976
Filed:
Jul. 09, 1974
Abstract
A miniature self-starting electric motor includes a rotor shaft rotatably disposed in a casing. Two rotors fixed to said rotor shaft each have a circular body portion of soft magnetic material, said circular body portion having a periphery with pole teeth extending therefrom and spaced from each other at equal angular spacings. Two exciting coils each are disposed to face the pole teeth. Two magnets each provide radially north and south poles alternating at an equal angle with axially same polarities as the other magnet and facing the pole teeth, the number of poles on each permanent magnet being an even multiple of the number of pole teeth. The two rotors are in an opposite relation each other, the pole teeth of one of said two rotors being staggered from the pole teeth of the other by a predetermined electric angle. A condenser is selectively connectible to either one of said two exciting coils. Such miniature self-starting motor rotates reliably in a predetermined direction at the time of starting. Further, the direction of rotation can be selectively determined by operating a switch.