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:
Mar. 14, 1995
Filed:
Aug. 06, 1992
Applicant:
Inventors:
Hideaki Kobayashi, Sakura, JP;
Takeshi Obata, Funabashi, JP;
Assignee:
Hitachi, Ltd., Tokyo, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
D01H / ; H02K / ;
U.S. Cl.
CPC ...
57100 ; 57129 ; 310 80 ; 310157 ;
Abstract
A directly motor-driven spindle assembly in a rotary shaft having one end supported on a bearing and the other end connected to a load a, driving apparatus fixed to the rotary shaft to rotate the rotary shaft, and control apparatus for controlling the movement of the rotary shaft toward the side of the load according to the movement of the rotary shaft from a predetermined position. The control apparatus prevents the jumping motion of the rotary shaft which occurs as the load increases to enable the directly motor-driven spindle assembly to operate at a high rotating speed without the jumping motion.