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. 15, 2002
Filed:
Jun. 26, 2000
Takahiro Nakamura, Fukui, JP;
Kenji Yamada, Fukui, JP;
Sodick Co., Ltd., Yokohama, JP;
Abstract
The main spindle ( A) for the main spindle device of a diesinker electric discharge machine is connected to a high rotor inertia, high output servo motor ( ) without passing through a speed reducer; the servo motor ( ) is equipped with a high resolution encoder ( ). A main spindle rotation speed detection signal is detected by the encoder ( ) when the main spindle ( A) is rotating in the high speed mode, and a main spindle angle position and rotation speed detection signal are detected when the main spindle ( A) is being angle divided, and these signals are fed back to the servo motor ( ) motor driver ( ). High speed rotational control and angle position precision angle division control are accomplished by a single servo motor and a single encoder.