公开(公告)号：US20240146219A1

公开(公告)日：2024-05-02

申请号：US17974884

申请日：2022-10-27

Applicant: COMET TECHNOLOGIES USA, INC.

Inventor： ANTHONY OLIVETI ,  J. KIRKWOOD ROUGH ,  DANIEL CATALAN ,  GARY RUSSELL

IPC: H02P8/34 ,  H01G5/16

CPC classification number: H02P8/34 ,  H01G5/16 ,  H01J37/32183

Abstract: A method for homing a stepping motor having a plurality of full-step positions within each full rotation of a rotor of the stepper motor includes applying a first drive current to windings of the stepper motor to rotate the rotor at least one full rotation in a first direction away from an end-of-travel (EOT) position. Thereafter, the drive current is applied to the windings to rotate the rotor in a second direction toward the EOT position. Upon detection of EOT, the drive current is discontinued. Drive current is then applied to the windings to rotate the rotor of the stepper motor in micro-steps in the first direction to a closest full-step position of the stepper motor. Finally, a drive current is applied to drive the stepper motor a predetermined number of full steps away from the EOT position.

公开(公告)号：US20230360858A1

公开(公告)日：2023-11-09

申请号：US17739745

申请日：2022-05-09

Applicant: COMET TECHNOLOGIES USA, INC.

Inventor： ANTHONY OLIVETI ,  TIGRAN POGHOSYAN ,  GARY RUSSELL

IPC: H01G5/013 ,  H01G5/18 ,  H01G5/14

CPC classification number: H01G5/14 ,  H01G5/0132 ,  H01G5/18 ,  H01G2005/02

Abstract: A variable capacitor includes an enclosure having first and second conductive collars separated by an intermediate electrically insulating element. A movable capacitor plate assembly is electrically coupled to the first conductive collar, and a fixed capacitor plate assembly is electrically coupled to the second conductive collar. An actuator extends into the enclosure for advancing and retracting the movable capacitor plate assembly relative to the fixed capacitor plate assembly. A hermetically sealed volume within the enclosure maintains a vacuum or a liquid serving as a dielectric between a capacitor plate of the movable capacitor plate assembly and a capacitor plate of the fixed capacitor plate assembly. At least one capacitor plate comprises a coiled cylindrical plate having a having a greater height at a center portion of the capacitor plate coil and a lower height at an outer portion of the capacitor plate coil.