Electrical generator or motor structure – Dynamoelectric – Rotary
Reexamination Certificate
2008-03-21
2010-10-12
Leung, Quyen (Department: 2834)
Electrical generator or motor structure
Dynamoelectric
Rotary
C310S051000, C310S089000
Reexamination Certificate
active
07812493
ABSTRACT:
In a spindle apparatus for a machine tool, a spindle is supported on a housing by support-purpose bearing devices, and is rotated by an electric motor, and a tool is attached to a tool attaching portion formed at a distal end of the spindle. A radial magnetic bearing for vibration suppressing purposes which includes a plurality of electromagnets is provided around the tool attaching portion of the spindle. A plurality of radial displacement sensors for detecting a displacement of the tool attaching portion in radial directions are provided around the tool attaching portion. There is provided an electromagnet control unit for controlling the electromagnets of the radial magnetic bearing on the basis of outputs of the radial displacement sensors so as to support the tool attaching portion in a predetermined position.
REFERENCES:
patent: 4180946 (1980-01-01), Heijkenskjold et al.
patent: 5760510 (1998-06-01), Nomura et al.
patent: 6806606 (2004-10-01), Ohtachi et al.
patent: 2008/0231129 (2008-09-01), Kubo et al.
patent: 10 2005 001 494 (2006-07-01), None
patent: 0 674 112 (1995-09-01), None
patent: 11-099433 (1999-04-01), None
patent: 2000-141104 (2000-05-01), None
patent: 2000-167739 (2000-06-01), None
patent: 2001-041240 (2001-02-01), None
patent: 2002-039177 (2002-02-01), None
patent: WO 88/03458 (1988-05-01), None
European Search Report dated Jul. 8, 2008 with an English language translation.
Ishigami Takayuki
Kameno Hironori
Kubo Atsushi
Jtekt Corporation
Leung Quyen
McGinn IP Law Group PLLC
Scheuermann David W.
LandOfFree
Spindle apparatus does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Spindle apparatus, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Spindle apparatus will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-4224710