Hamilton Sundstrand Corporation

Otis Elevator Company

Sastry V Vedula

Gregory I Rozman

Jacek F Gieras

Vietson M Nguyen

Pei-Yuan Peng

Bryan Robert Siewert

Steven J Moss

Carl A Wagner

Josh C Swenson

James J Wrobel

Neal D Clements

Mario R Rinaldi

Kenneth Whalen

A system for controlling a solid state circuit breaker comprises a solid state power switch, and a controller for providing a gate voltage to the power switch. During turnoff of the solid state power switch, the controller reduces the gate voltage to an intermediate level for a specified time period and then reduces the gate voltage to a turnoff level.

System and method for controlling solid state circuit breakers

An elevator door assembly () includes an electromagnet () use as part of a door coupler for coupling elevator car doors () to elevator hoistway doors (). A disclosed example includes an electromagnet core () with a gap () in one of four sides of the core. The gap () directs and concentrates magnetic flux of the electromagnet () to concentrate an attractive force for coupling the electromagnet () with a vane (). Disclosed examples includes unique geometric and dimensional relationships to achieve a desired goodness factor.

Electromagnet and elevator door coupler

A method for generating and controlling power by means of at least one controlled permanent magnet machine (PMM) with a permanent magnet (PM) rotor and a stator with a magnetic flux diverter circuit for controlling the output of the PMM, comprises the steps of: rotating the PM rotor at a velocity sufficient to develop a high frequency alternating current (HFAC) power output from the stator; transforming the HFAC output to produce a desired non-HFAC power output; sensing desired power output parameters; generating a control signal responsive to the sensed parameters; and applying the control signal to the magnetic flux diverter circuit to control the desired power output.

Power generating system with flux regulated generator

An electromagnetic coupling device includes a vane member and an electromagnet. The electromagnet includes a core having a plurality of poles comprising at least four poles. An electrically conductive winding has a first portion surrounding a first one of the poles and a second portion surrounding a second one of the poles. The winding is selectively energized for selectively magnetically coupling the electromagnet and the vane member such that the vane member and the electromagnet are movable together in a desired direction.

A method and apparatus for controlling a converter circuit within the electrical accumulator unit based on a comparison between an actual average converter current and a desired average converter current.

Method and apparatus for average current control

A motor drive ground fault detection device operates by computing the total RMS voltage of all the phases, and comparing the total RMS voltage to a threshold to determine if a ground fault has occurred.

Motor drive ground fault detection

A power-conversion control system includes an inverter, a cycloconverter, and a sliding mode controller. The inverter is operable to receive a DC voltage input and produce a first AC voltage output having a first frequency. The cycloconverter has a plurality of bidirectional switches, and is operable to receive the first AC voltage and to synthesize a second AC voltage having a second frequency that is lower than the first frequency. The sliding mode controller is operable to provide a control signal to command the plurality of bidirectional switches to turn OFF and ON when the first AC voltage is at a zero crossing condition. The sliding mode controller is also operable to selectively adjust the frequency and amplitude of the second AC voltage.

Power-conversion control system including sliding mode controller and cycloconverter

A fault protection system for an AC-DC distribution system detects the presence of DC content at individual loads, isolates the load responsible for the fault from the remainder of the distribution system, and blocks DC content from being propagated from the faulty load to the AC source. The fault protection system includes at least one circuit breaker connected to monitor the AC current provided to the individual electrical load and to detect the presence of DC content indicative of the load being faulty. In response to detected DC content, the circuit breaker trips open to disconnect the electrical load from the AC distribution system to prevent DC content from being propagated to adjacent loads.

Identification and protection of an aerospace AC-DC power system in the presence of DC content due to faulty loads

A method comprises determining whether a ground fault on a bus () operative to drive the system () exceeds a first threshold level, () receiving values of phase currents of a first motor, () calculating a sum of the values of the phase currents of the first motor () responsive to determining that the ground fault on the bus exceeds the first threshold value, and () determining whether the sum of the values of the phase currents of the first motor () exceeds a second threshold value ().

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Loves Park, IL, United States of America

Sastry V Vedula