Position-control stage with onboard linear motor

A position-control stage comprising a bed, a turntable supported for rotation on the bed through a rolling-contact bearing, a linear motor moving the turntable relatively to the bed in a circular direction, and an encoder monitoring a relative position of the turntable to the bed;

• wherein the linear motor is comprised of armature windings at a primary side and field magnets at a secondary side;
• wherein the armature windings are each made of a three-phase coreless coil where winding turns are wound in a form of flat rectangular loop, are circularly arranged on a disc surface of the bed along a preselected curvature, and lie in radial juxtaposition in circumferential direction;
• wherein the field magnets are made in a flat shape and arranged underneath the turntable in such a pattern lying radially on a disc surface of the preselected curvature in opposition to the armature windings, with their unlike poles alternating in polarity along a circular direction;
• and
• wherein the field magnets fit in a circular recess cut in an underside of the turntable, and the armature windings lie circularly on a coil support that fits in a circular recess sunken below a top surface of the bed.

A position-control stage comprising a bed, a turntable supported for rotation on the bed through a rolling-contact bearing, a linear motor moving the turntable relatively to the bed in a circular direction, and an encoder monitoring a relative position of the turntable to the bed;

• wherein the linear motor is comprised of armature windings at a primary side and field magnets at a secondary side;
• wherein the armature windings are each made of a three-phase coreless coil where winding turns are wound in a form of flat rectangular loop, are circularly arranged on a disc surface of the bed along a preselected curvature, and lie in radial juxtaposition in circumferential direction;
• wherein the field magnets are made in a flat shape and arranged underneath the turntable in such a pattern lying radially on a disc surface of the preselected curvature in opposition to the armature windings, with their unlike poles alternating in polarity along a circular direction;
• wherein a linear encoder to monitor any turning position of the turntable relative to the bed is comprised of an optical linear scale surrounding around an outside periphery of the turntable, and a sensor arranged on the bed;
• and
• wherein an origin mark is affixed to the underside of the turntable in opposition to the sensor of the bed at a preselected position in the circular direction.

A position-control stage comprising a bed, a turntable supported for rotation on the bed through a rolling-contact bearing, a linear motor moving the turntable relatively to the bed in a circular direction, and an encoder monitoring a relative position of the turntable to the bed;

• wherein the linear motor is comprised of armature windings at a primary side and field magnets at a secondary side;
• wherein the armature windings are each made of a three-phase coreless coil where winding turns are wound in a form of flat rectangular loop, are circularly arranged on a disc surface of the bed along a preselected curvature, and lie in radial juxtaposition in circumferential direction;
• wherein the field magnets are made in a flat shape and arranged underneath the turntable in such a pattern lying radially on a disc surface of the preselected curvature in opposition to the armature windings, with their unlike poles alternating in polarity along a circular direction;
• and
• wherein a stopper extends below the underside of the turntable while another stopper extends above the top surface of the bed, so that the turntable stops turning after the stopper has come into abutment against the another stopper, and a before the-origin sensor and a limit sensor are installed short of the another stopper on the bed to detect when the stopper on the turntable reaches the sensors.

A position-control stage comprising a bed, a turntable supported for rotation on the bed through a rolling-contact bearing, a linear motor moving the turntable relatively to the bed in a circular direction, and an encoder monitoring a relative position of the turntable to the bed;

• wherein the linear motor is comprised of armature windings at a primary side and field magnets at a secondary side;
• wherein the armature windings are each made of a three-phase coreless coil where winding turns are wound in a form of flat rectangular loop, are circularly arranged on a disc surface of the bed along a preselected curvature, and lie in radial juxtaposition in circumferential direction;
• wherein the field magnets are made in a flat shape and arranged underneath the turntable in such a pattern lying radially on a disc surface of the preselected curvature in opposition to the armature windings, with their unlike poles alternating in polarity along a circular direction;
• and
• wherein the turntable is made at a center thereof with an opening for looking into the interior to form a circular support where the turntable is supported for rotation on another circular support of the bed through the rolling-contact bearing.