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. 15, 2011
Filed:
Mar. 02, 2010
Hirokazu Nagura, Hitachi, JP;
Hiromi Inaba, Hitachinaka, JP;
Toshifumi Yoshikawa, Hitachinaka, JP;
Hironori Ohashi, Narashino, JP;
Yuri Takano, Narashino, JP;
Masaki Sugiura, Tokyo, JP;
Hirokazu Nagura, Hitachi, JP;
Hiromi Inaba, Hitachinaka, JP;
Toshifumi Yoshikawa, Hitachinaka, JP;
Hironori Ohashi, Narashino, JP;
Yuri Takano, Narashino, JP;
Masaki Sugiura, Tokyo, JP;
Hitachi, Ltd., Tokyo, JP;
Abstract
The start timing of the pole position inference process of the linear motor installed vertically is delayed by a predetermined time after instruction of brake release. For example, from (1) increasing of the thrust instruction value of an ASR control system up to a predetermined value, (2) the movement (falling) distance of the moving part, or (3) the moving (falling) speed of the moving part, the release condition of the brake is detected and moreover after a predetermined time, the inference process of the pole position is started. The inference process of the pole position of a synchronous motor is fit to the release timing of a brake and a malfunction of the inference process and a runaway (falling in the vertical drive) of a moving part are prevented.