Abstract: An electromechanical power transfer system that transfers power between a direct current (DC) electrical power system and a prime mover, comprises: a permanent magnet machine (PMM) comprising a permanent magnet (PM) rotor that rotates a drive shaft of the prime mover, a stator and a control coil; that an inverter/rectifier system for converting DC power from the DC power system to multiphase alternating current (AC) power on an AC bus; a control coil current regulator system for regulating current through the control coil; wherein the inverter/rectifier system responds to a position reference signal, a current load feedback signal and a current load reference signal to regulate acceleration of the PMM; wherein the control coil current regulator system responds to a control coil current reference signal and a control coil current feedback signal to regulate current in the PMM; and wherein the power transfer system starts in an open loop mode, and the first and second speed switches respond to a closed loop ena

Abstract: An electromechanical power transfer system that transfers power between a direct current (DC) electrical power system and a prime mover, comprises: a permanent magnet machine (PMM) comprising a permanent magnet (PM) rotor that rotates a drive shaft of the prime mover, a stator with a multiphase alternating current (AC) winding coupled to the AC bus for developing a rotating magnetic field with a magnetic flux path that causes rotation of the PM rotor and a control coil with a winding that has a configuration to generate a magnetic field with flux that varies the reactance of the stator winding upon the application of current through the control coil; a plurality of AC current sensors for sensing the current in each phase of the multi-phase AC bus and generating respective AC bus current signals that represent the current level of each phase; an average current detector that receives the AC bus current signals and generates a respective current load feedback signal; a back electromotive force (emf) detector co

Abstract: A semiconductor package includes a plurality of semiconductor devices disposed in an array surrounding a central electrode structure carried by a package support member. The package is capable of withstanding high voltages and currents and includes a heat exchanger integral therewith.

Abstract: A conductive bus member operable over a selected operating frequency range includes a cylindrical main body and first and second legs secured to the main body at first and second points whereby first and second current paths having first and second impedances are defined between the first and second points. A predetermined relationship between the first and second impedances is maintained over the selected operating frequency range.

Abstract: An electrical device is capable of sensing both AC and DC current which is flowing through an electrical circuit. The electrical device bifurcates the current into separate paths, wherein impedance of each path has a constant relationship to each other. In a further embodiment, the electrical device includes a current sensor for measuring current flowing through the circuit. The sensor is of a type which does not introduce insertion loss.

Abstract: A current sensor operable over a selected operating frequency range includes a flux concentrating core. The core is fabricated by forming a series of tape-wound laminations into a desired closed shape, securing the laminations together at a point and removing material at the point to create a gap.

Abstract: A package for a high power electrical component includes a base and a plate disposed on a support surface of the base and having an electrically insulative layer and an outer layer having a conductive portion thereon. An electrically conductive pad is disposed on the electrically conductive portion of the plate and the electrical component is disposed on the pad. A cover is disposed atop the base and encloses the plate, the pad and the electrical component. First and second electrically conductive terminals extend through apertures in the cover and are electrically coupled to the electrodes of the electrical component. The cover is hermetically sealed to the base and to the first and second terminals. The coefficient of thermal expansion of the base and cover are substantially equal to minimize stresses developed therein.

Abstract: Control circuits for operating electric motors of the class having windings pulsed in sequence and a magnetic field, the class being exemplified by brushless d.c. motors. Improved apparatus is provided for accommodating flyback action when excitation current through any one of the windings is interrupted by the opening of a switch device (e.g., on-off controlled transistor), whether that device be a sequence power switch or a main switch having a common series relation to all of the power switches and operated with an adjustable duty cycle so as to permit adjustment of motor speed and torque. The flyback apparatus, as here disclosed, provides low loss flyback current paths so as to return inductively stored energy back into the winding when its excitation is interrupted, thereby to enhance motor efficiency while eliminating high open circuit voltages across the switching devices. Negative torque which might be created in the flyback circuits as a result of back e.m.f.