Symmetrical multi-axis linear motor machine tool
Number of patents in Portfolio can not be more than 2000
United States of America Patent
Stats
-
Aug 17, 1999
Issued Date -
N/A
app pub date -
Aug 29, 1997
filing date -
May 12, 1995
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
A machine tool has a frame supporting a vertical gantry which is driven at the top and bottom sides of the gantry such that the opposed, normal magnetic forces between stator coils and magnets are substantially equal and are self-cancelling. This reduces normal magnetic forces that increase friction, and this provides symmetry along an X-axis. A spindle-carrying saddle travels in a vertical slot in the center of the gantry with left and right linear motors mounted on opposite sides of the gantry. The linear motors are identical so that opposed right and left-hand, normal magnetic forces are self-cancelling. This provides symmetry along the vertical Y-axis. A spindle and ram are mounted on the saddle and are driven by at least one linear motor to travel along the Z-axis. The symmetry and cancelling of normal, magnetic attractive forces reduces the weight and the amount of forces needed to accelerate the gantry in the X-direction and the saddle in the Y-direction. The preferred frame is a stationary, box-type structure which encompasses the gantry and spindle, and the frame provides an enclosed space protecting the linear motors.
First Claim
Other Claims data not available