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:
Nov. 03, 1998
Filed:
Feb. 27, 1997
Applicant:
Inventors:
Hisayuki Kanki, Kobe, JP;
Naoki Taguchi, Akashi, JP;
Shinji Michimoto, Kobe, JP;
Kazuhiro Oba, Murayama, JP;
Assignee:
Nabco Limited, Kobe, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H02P / ;
U.S. Cl.
CPC ...
318286 ; 318274 ;
Abstract
An automatic door system includes a motor which drives a door to open and close. A CPU operating in accordance with a signal from an encoder operatively coupled to the motor detects the position of the door and prepares and applies a control signal based on the detected door position to a motor drive unit. The motor drive unit alternately drives and brakes the motor. The CPU calculates the speed of the door at a particular door position on the basis of the signal from the encoder and operates to make the door speed equal to the aimed speed for the current door position.