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:
Jul. 05, 1994
Filed:
Jul. 16, 1993
Applicant:
Inventors:
Assignee:
Hitachi, Ltd., Tokyo, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H01H / ;
U.S. Cl.
CPC ...
318801 ; 307117 ; 3072001 ;
Abstract
A brushless motor accommodated within a case and having mounted on a substrate rotor speed detection sensors and a monolithic integrated circuit which includes an inverter for driving the rotor, drive circuits for driving the inverter, power source circuit for supplying a power required by each circuit, circuits for controlling the speed of the rotor and a protection circuit for protecting the inverter from excess current.