Jeffrey Donald Shoemaker

US Patent:

7629764, Dec 8, 2009

Filed:

Feb 5, 2007

Appl. No.:

11/702426

Inventors:

Jeffrey W. Shoemaker - Andover MN, US
Timothy M. Lewis - San Jose CA, US

Assignee:

BAE Systems Land & Armaments L.P. - Arlington VA

International Classification:

G05B 11/01

US Classification:

318629, 318432, 318461, 318632

Abstract:

The present invention provides a torque loop control method for servomotors utilizing discontinuous pulse width modulation that incorporates measuring the power factor in real time. Also included is a sine wave generator for software-based spectrum analysis.

US Patent:

20070273359, Nov 29, 2007

Filed:

Feb 5, 2007

Appl. No.:

11/702445

Inventors:

Timothy Grupa - Golden Valley MN, US
Lane Woodland - Excelsior MN, US
Stephen Stocker - Andover MN, US
Martin Sukup - St. Paul MN, US
Bret Bartness - Plymouth MN, US
David Badzinski - Minneapolis MN, US
Jeffrey Shoemaker - Andover MN, US
Keith Walters - Minneapolis MN, US

International Classification:

G01R 15/20
H05K 7/20

US Classification:

32411700H, 361702000

Abstract:

A modular current sensing system for a servo control system that includes a magnetic core with an open center portion and a connection plate that includes at least three wire connectors, wherein the wire connectors are capable of connecting at least two wires electrically in series. The system also includes a plurality of wires, including a first wire with a first end and a second end, wherein the first end of the first wire is electrically connected to a first power source, and the second end of the first wire is connected to the connection plate at the first wire connector and wherein the first wire passes through the open portion defined by the magnetic core at least once. A first motor current flowing through the first wire induces a core current to flow in the magnetic core, causing the magnetic core to emit a magnetic field. A Hall effect sensor detects the magnetic field, produces an output current, and delivers the output current to a control device within a servo control system.