Richard E Waltz

US Patent:

6411489, Jun 25, 2002

Filed:

Feb 23, 2001

Appl. No.:

09/792702

Inventors:

Mark A. Kappel - Brookfield WI
Richard W. Waltz - Franklin WI
Richard G. Smith - Caledonia WI
Donald F. Swietlik - Waukesha WI
Raymond H. Hannula - Delafield WI
Christopher J. Wieloch - Brookfield WI
Jeffrey R. Annis - Underwood CT

Assignee:

Rockwell Automation Technologies, Inc. - Mayfield Heights OH

International Classification:

H01H 900

US Classification:

361160, 361170, 361187

Abstract:

An electromagnetic operator includes first and second coils wound coaxially. An armature partially surrounds the coils for channeling flux during energization of the coils. The armature may be formed of a bent plate and secured to a ferromagnetic support. A control circuit applies energizing signals to the coils during operation. Both coils are energized during an initial phase of operation. One of the coils is subsequently released or de-energized automatically. A timing circuit removes current from the second coil after a variable time period. The time period may be a function of the configuration of the timing circuit, such as an RC time constant, and of the energizing signal.

US Patent:

6493202, Dec 10, 2002

Filed:

Feb 23, 2001

Appl. No.:

09/791341

Inventors:

Mark A. Kappel - Brookfield WI
Richard W. Waltz - Franklin WI
Richard G. Smith - Caledonia WI
Donald F. Swietlik - Waukesha WI
Raymond H. Hannula - Delafield WI
Christopher J. Wieloch - Brookfield WI
Jeffrey R. Annis - Waukesha WI

Assignee:

Rockwell Automation Technologies, Inc. - Mayfield Heights OH

International Classification:

H01H 4700

US Classification:

361152, 361160

Abstract:

An electromagnetic operator includes first and second coils wound coaxially. An armature partially surrounds the coils for channeling flux during energization of the coils. The armature may be formed of a bent plate and secured to a ferromagnetic support. A control circuit applies energizing signals to the coils during operation. Both coils are energized during an initial phase of operation. One of the coils is subsequently released or de-energized automatically. A timing circuit removes current from the second coil after a variable time period. The time period may be a function of the configuration of the timing circuit, such as an RC time constant, and of the energizing signal.

US Patent:

41953240, Mar 25, 1980

Filed:

Jul 26, 1978

Appl. No.:

5/928303

Inventors:

Richard W. Waltz - Milwaukee WI

Assignee:

Allen-Bradley Company - Milwaukee WI

International Classification:

H02H 708

US Classification:

361 25

Abstract:

An SCR is connected across one of three line contacts which couple the power lines to the windings of an a. c. motor. When the line contacts are opened to shut down the motor, heating current is applied to one of the motor windings through the SCR to raise its temperature above the ambient dew point. The SCR is fired every cycle of the line current and the firing angle is controlled in response to a command signal to provide the proper amount of heating current in the motor winding. The command signal is generated by summing a preselected reference signal with a negative feedback signal which is indicative of the amount of motor heating.

US Patent:

62820761, Aug 28, 2001

Filed:

Sep 30, 1999

Appl. No.:

9/410251

Inventors:

Mark A. Kappel - Brookfield WI
Richard W. Waltz - Franklin WI
Richard G. Smith - Caledonia WI
Donald F. Swietlik - Waukesha WI
Raymond H. Hannula - Delafield WI
Christopher J. Wieloch - Brookfield WI
Jeffrey R. Annis - Waukesha WI

Assignee:

Rockwell Technologies, LLC - Thousand Oaks CA

International Classification:

H01H 4728

US Classification:

361187

Abstract:

An electromagnetic operator includes first and second coils wound coaxially. An armature partially surrounds the coils for channeling flux during energization of the coils. The armature may be formed of a bent plate and secured to a ferromagnetic support. A control circuit applies energizing signals to the coils during operation. Both coils are energized during an initial phase of operation. One of the coils is subsequently released or de-energized automatically. A timing circuit removes current from the second coil after a variable time period. The time period may be a function of the configuration of the timing circuit, such as an RC time constant, and of the energizing signal.

US Patent:

62331310, May 15, 2001

Filed:

Sep 30, 1998

Appl. No.:

9/164205

Inventors:

Mark A. Kappel - Brookfield WI
Richard W. Waltz - Franklin WI
Richard G. Smith - Caledonia WI
Donald F. Swietlik - Waukesha WI
Raymond H. Hannula - Delafield WI
Christopher J. Wieloch - Brookfield WI
Jeffrey R. Annis - Waukesha WI

Assignee:

Rockwell Technologies, LLC - Thousand Oaks CA

International Classification:

H01H 900

US Classification:

361160

Abstract:

An electromagnetic operator includes first and second coils wound coaxially An armature partially surrounds the coils for channeling flux during energization of the coils. The armature may be formed of a bent plate and secured to a ferromagnetic support. A control circuit applies energizing signals to the coils during operation. Both coils are energized during an initial phase of operation. One of the coils is subsequently released or de-energized automatically. A timing circuit removes current from the second coil after a variable time period. The time period may be a function of the configuration of the timing circuit, such as an RC time constant, and of the energizing signal.

US Patent:

52837084, Feb 1, 1994

Filed:

Sep 23, 1992

Appl. No.:

7/950984

Inventors:

Richard W. Waltz - Milwaukee WI

Assignee:

Allen-Bradley Company, Inc. - Milwaukee WI

International Classification:

H02H 708

US Classification:

361 93

Abstract:

A device protects an electric load, such as a motor, from excessive current levels. The current flows from a source to the load through a switch and a primary winding of a current sensing transformer. The voltage across a secondary winding of the current sensing transformer is rectified to produce a voltage which is measured to determine the level of current through the load. The voltage across the secondary winding also powers components of the device. In a first mode of operation, current from the secondary winding is applied to charge a power supply capacitor. In a second mode of operation the level of the rectified voltage is sensed to produce a sample of the level of the current flowing through the load. From this sample the change in temperature of the load since a previous sample is calculated and used to derive the present load temperature. When the present load temperature exceeds a defined threshold level, the switch is opened to disconnect the load from the electricity source.

US Patent:

61986143, Mar 6, 2001

Filed:

Sep 30, 1998

Appl. No.:

9/165011

Inventors:

Mark A. Kappel - Brookfield WI
Richard W. Waltz - Franklin WI
Richard G. Smith - Caledonia WI
Jeffrey R. Annis - Waukesha WI
Christopher J. Wieloch - Brookfield WI

Assignee:

Rockwell Technologies, LLC - Thousand Oaks CA

International Classification:

H01H 7300

US Classification:

361115

Abstract:

An electrical contactor includes an electromagnetic operator which may be powered by either AC or DC power. For use with AC power, a rectifier circuit converts AC waveforms to DC waveforms and applies the converted power to DC one or more DC coils. The rectifier circuitry applies DC power directly to a bus. A pair of coils may be used, such as separate pickup and holding coils. The pickup coil may be de-energized after an initial phase of operation. To permit rapid release of the holding coil, a control circuit interrupts an induced current path through the coil upon removal of power from the bus.

US Patent:

56571941, Aug 12, 1997

Filed:

Jul 28, 1995

Appl. No.:

8/508771

Inventors:

Richard W. Waltz - Franklin WI

Assignee:

Allen-Bradley Company, Inc. - Milwaukee WI

International Classification:

H02H 500

US Classification:

361 75

Abstract:

A reset circuit for an overload relay includes a timing circuit coupled to a switching circuit for automatically resetting the relay a predetermined time after a trip. The timing circuit includes a capacitor and a resistor in parallel with a reset coil. The capacitor is charged during normal operation and begins to discharge through the resistor following a trip at a first rate determined by the size of the resistor. The switching circuit includes a pair of transistors, a pair of capacitors and a pair of resistors. When the capacitor in the timing circuit has discharged a predetermined amount following a trip, the switching circuit is triggered and couples the capacitor to ground through one of the transistors, causing a rush of current through the reset coil sufficient to reset the relay.

Author:

Richard Waltz

ISBN #:

0517102293