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. 09, 1999
Filed:
Apr. 18, 1997
Naoto Tojo, Nara, JP;
Shinichi Matsumura, Osaka, JP;
Takafumi Nakayama, Hyogo, JP;
Daizo Takaoka, Osaka, JP;
Sanyo Electric Co., Ltd., Moriguchi, JP;
Abstract
In a linear compressor driving apparatus, a position instructing portion (31) outputs a position instruction value Pref of a piston in accordance with an equation A*sin .omega.t. A position control portion (33) calculates a speed instruction value Vref by multiplying difference between position instruction value Pref and position present value Pnow by a constant Gv. A speed control portion (35) calculates a current instruction value Iref by multiplying a difference between speed instruction value Vref and speed present value Vnow by a constant Gi. A current control portion (37) controls a power source (3) so that current present value Inow becomes equal to the current instruction value Iref. Phase control portion (38) adjusts .omega. and Gi so as to eliminate phase difference between speed present value Vnow and current instruction value Iref. Since thrust of linear motor can be directly and appropriately controlled in accordance with the load condition, high efficiency is obtained.