Abstract: A method for facilitating damping torsional or ring vibrations of a dynamoelectric machine including a rotor assembly with a first amortisseur bar and a second amortisseur bar extending therefrom and terminating at an endring is provided. The method includes providing a damping assembly, and positioning the damping between the first amortisseur bar and the second amortisseur bar such that the damping assembly contacts the first and second amortisseur bars, and is substantially proximate the endring or alternatively the damping assembly is positioned only over one amortisseur bar.

Abstract: A compiler and compiling method providing modification of a value of a variable at run-time of a computer program wherein additional space in memory is allocated for variable modification parameters, assembly or object code is added upon compilation of the computer program, the added code being dependent on the variable modification parameters, and the value of the variable is modified at run time based on the added code and at least one of the variable modification parameters such that the value of the variable at run time is set to be equivalent to at least one of a fault value, a value multiplied by a predetermined gain and a value offset from the value of the variable or remains unchanged (unscaled) if so desired. The application of the compiler functionality or method is preferably controllable by a software switch for individual and/or all variables.

Abstract: A multivariable control method and system suitable for manipulating process variables based on observed changes in controlled objectives without extensive data analysis or involved model development. The method includes operating the process at an initial set of process variables and an initial set of controlled objectives, monitoring the set of process variables and the set of controlled objectives while continuously operating the process, adjusting one or more members of the set of process variables based upon a non-linear optimization with respect to a desired set of controlled objectives, and utilizing the monitored set of process variables and the monitored set of controlled objectives in the non-linear optimization.

Abstract: A motor protection trip unit for a circuit breaker includes an electrically conductive strap, a yoke including a body including a first side wall, a second side wall, a third side wall, and a fourth side wall. The third side wall extends between the first and second side walls, the fourth side wall extending from the first and second side walls and comprising a yoke gap extending therethrough. A motor protection trip unit for a circuit breaker also includes a flapper holder coupled to the strap, a flapper pivotally coupled to the flapper holder, and a biasing mechanism coupled between the flapper holder and the flapper. The biasing mechanism is configured to maintain the flapper a distance from the yoke such that a yoke-flapper gap is defined between the yoke and the flapper.

Abstract: A method for separating electrical runout from mechanical runout includes positioning at least one position probe against a rotating part, positioning at least one proximity probe adjacent the rotating part, and calculating an electrical runout based on measurements obtained from the position probe and the proximity probe.

Abstract: A removable cover for a an electrical component box includes a pair of side walls having hinge edges including a hook and an engagement surface extending from the hook. The hook slides over and engages the hinge members of a box, and the engagement surface forms a sliding surface that allows rotation of the cover about the hinge elements. The hinge is easily installed and removed by orienting the cover at a selected angle relative to a longitudinal axis of the box, and lifting the hook over the hinge member to either engage or disengage the hook from the hinge members.

Abstract: A configuration of a thyristor stack is provided. The stack includes thyristors, electrically conductive bars, and reactors that are mounted around the electrically conductive. Heat sinks may be included in the thyristor stack to assist in heat dissipation, although they may not be necessary. A method for constructing a thyristor stack is also provided.

Abstract: Methods and apparatus for maintaining a PLC revision history are described. In one embodiment, the PLC creates and maintains a revision history log that provides information related to changes made to the PLC user program and/or the PLC configuration. If a change is detected, information regarding the change is gathered and stored in the history log. The history log maintains a record of the revisions made to the PLC. If the history log becomes full, the oldest revision entry is deleted and the latest change is incorporated into the history log.

Abstract: A bearing seat includes a cylindrical scat defining a cylindrical pocket for at least partially containing a bearing. The cylindrical seat includes a cylindrical first wall and an end wall extending from the cylindrical first wall. The cylindrical first wall has an inner face and the end wall includes an integral shim extending outwardly therefrom. The integral shim is configured to contact a side of an outer race of a bearing such that the side of the outer race of the bearing seats firmly against the integral shim.

Abstract: A transfer switch includes a cam including a first groove and a second groove different from the first groove, a follower apparatus positioned in the second groove, and a driver apparatus positioned in the first groove, the driver apparatus configured to rotate the cam in only a first direction.

Abstract: A method for retaining a terminal of a terminal assembly for a positive temperature coefficient resistor/overload resistor (PCTR/OL) assembly includes providing a body having an inner surface, and disposing at least one retaining member to the inner surface. The retaining member is configured to engage the terminal substantially perpendicular to an axis of symmetry of the terminal.

Abstract: The invention provides a diagnostic method and system for monitoring controller performance. The diagnostic system includes a tool and a controller. The tool includes a user interface that displays at least one operational status command, such that a user may select the operational status command. A controller has an operation status. The operational status command of the tool queries the operation status of the controller. As a result, the controller generates at least one operational status response. A communications path for transmission of the at least one operational status command from the tool to the controller and the at least one operational status response from the controller to the tool is provided. The user interface displays the operational status response of the controller.

Abstract: A controller for controlling and monitoring the operation of an engine-generator is disclosed. The controller includes a central processing unit, a power supply, an input/output system, a communication system, an annunciation system and mode control switches. The operational status of the engine-generator is displayed on a liquid crystal display and logged in a data storage system or communicated to an external system using a communications interface. The controller also incorporates a monitoring system.

Abstract: A mounting system for a motor assembly includes a plurality of fasteners for mounting a grill to a motor. The motor includes an endshield including a plurality of attachment points for attaching the endshield to the motor assembly and a plurality of openings for attaching the endshield to the grill. The grill is configured to be mounted to one of a first motor assembly and a second motor assembly. The endshield is formed with either a plurality of bosses including openings or a plurality of self-clinching nuts pressed into the plurality of openings.

Abstract: A motor including a first compartment, a second compartment, a frame, a first end shield, a second end shield, an armature shaft, a stator winding, an armature, a cover, and a switchboard is provided. The first and second end shields are disposed adjacent opposing ends of the frame to define the first compartment. The armature shaft extends between the first and second end shields. The stator winding is supported by the frame within the first compartment. The armature is rotatably supported by the end shields and disposed within the first compartment adjacent the stator winding. The cover includes a first end, a peripheral edge, and ventilation openings. The cover peripheral edge is mounted to the motor adjacent the second end shield. The ventilation openings include a plurality of openings positioned along at least part of the cover peripheral edge and in the cover first end.

Abstract: An electronic electricity meter includes voltage sensors configured to generate measurements of voltage at voltage elements, current sensors configured to generate measurements of current through current elements, a microcomputer coupled to the current and voltage sensors and configured to control operation of the meter, and a memory coupled to the microcomputer including calibration constants to compensate for instrument transformer ratio and phase angle errors. The microcomputer is configured to use the calibration constants, when so instructed, to correct for measurement errors that occur based upon instrument transformer ratios and phase angles and to correct metering quantities calculated by the microcomputer.

Abstract: A system and method determine the parameters of a field of a DC motor. The method comprises obtaining parameters of the DC motor; and performing an iterative processing loop, the iterative processing loop being performed n times. The iterative processing loop includes regulating field current based on the parameters of the DC motor, and calculating a field resistance from a field voltage and the field current measured during the regulating of the field current; operating in a closed loop mode to determine a first field firing angle and a second field firing angle; operating in an open loop mode to determine a first time constant and a second time constant based on applying the first field firing angle and the second field firing angle; and determining at least one parameter of the field of the DC motor based on the first time constant, the second time constant, and the calculated field resistance.

Abstract: A stator frame for an electric motor including a substantially cylindrical shaped body section having opposed ends, a cooling passageway extending through at least a portion of the body section, and at least one spacer bar. The cooling passageway includes a cooling conduit having an inlet port and an outlet port in flow communication with the cooling passageway. The spacer bar has a notched side and at least one finger extending therefrom such that the finger mechanically couples the spacer bar to the cooling conduit.

Abstract: Using a personal digital assistant (PDA) to collect operational data for analysis on computers from systems including engine-generator controllers and the downloading of operational parameters to engine-generator controllers is described. The engine-generator controllers control at least one engine-generator set. A method for using the PDA includes the steps of configuring the controller with a communications service manager to enable communications with the PDA and configuring the PDA to display engine-generator operational data. The method of collection and downloading continues by transferring operational parameters from the computer to the PDA, downloading the operational parameters from the PDA to the controller, uploading operational data from the controller to the PDA and transferring operational parameters from the PDA to the computer.

Abstract: A method for shorting rotor windings in a wound rotor induction machine is disclosed. The method includes the steps of monitoring rotor current for a frequency indicative of a desired steady-state operating condition and electronically shorting the rotor windings when the monitored rotor current frequency reaches a defined threshold indicative of the desired steady-state operating condition.