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:
Jan. 28, 1997
Filed:
Dec. 22, 1995
Shinji Aoshima, Hamamatsu, JP;
Morito Morishima, Hamamatsu, JP;
Yamaha Corporation, , JP;
Abstract
A phase shifting device including multipliers, a table and first adders, generates and outputs first shifted phase data and second shifted phase data obtained by shifting first feed phase data and second feed phase data as much as a phase displacement from a rising zero cross point in a last cycle of the first feed phase data to a target position. A counting device counts down upon every rising zero cross point of the first shifted phase data as many as the number of revolutions of a motor up to the target position, and then activates a brake mode at the next falling zero cross point of the first shifted phase data. In the brake mode, a controlling device feed-controls so as to converge at a rising zero cross point of the first shifted phase data after the end of the counting, through a second adder, a limiter, a loop filter, and a third adder.