Abstract:
An electric power generation system having two main sources of ac power comprises a first and a second main power conversion and distribution unit (MPCDU1, MPCDU2), each electrically coupled to one of the sources of ac power. The MPCDUs controllably supply ac electric power to an associated main distribution bus and additionally convert that power to a second type of power. This second type of power is supplied to an associated secondary distribution bus and to a converted power output. The system also includes an auxiliary source of ac power and an auxiliary power conversion and distribution unit (APCDU) which is electrically coupled to the auxiliary source. The APCDU controllably supplies ac electric power to a ground service distribution bus and additionally converts that power to a second type of power which is then supplied to an associated secondary distribution bus and to a converted power output. Additionally, the MPCDUs and the APCDU each controllably supply ac electric power to, and demand power from, an ac tie bus. The system additionally comprises a central power conversion and distribution unit (CPCDU) which is electrically coupled to the converted power output of each MPCDU, and to the converted power output of the APCDU. The CPCDU selectively converts the second type of power from each MPCDU and the APCDU to an emergency type of power. This emergency power is controllably supplied to an emergency distribution bus.
Abstract:
Apparatus for detecting a dry bearing condition utilizes an ultrasonic transducer (40, 70) which is intermittently pulsed a certain number of times by a microprocessor and associated circuitry. The number of return pulses received by the ultrasonic transducer is detected by the microprocessor and is used to determine whether a dry bearing condition exists.
Abstract:
A control for operating an inverter coupled to a switched reluctance machine includes a relative angle estimation circuit for estimating rotor angle for a phase in the switched reluctance machine. The relative angle estimation circuit estimates a phase voltage and thereby calculates phase flux linkage to estimate the rotor angle.
Abstract:
This invention relates to a method of sealing resin to an alloy casting using either an aromatic solvent or an aqueous-based solution. The method includes providing a resin and combining the aromatic solvent with the resin to form a sealing coating which has a predetermined concentration by volume of resin to sealing coating. The method continues by heating the alloy casting to a first predetermined temperature and then selectively applying the sealing coating to the heated alloy casting. Finally the heated alloy casting is baked at a second predetermined temperature for a predetermined time period. Variations of this process using an aqueous-based solution include providing an aqueous-emulsified resin, and then combining the aqueous-emulsified resin with at least one base solvent to form a final aqueous-based solution which has a predetermined concentration by volume of base solvent to final aqueous-based solution. The process allows for the selection of differing materials to be combined.
Abstract:
The present invention provides for detecting rotor speed through the use of sense coils (240) on the stator teeth. Voltage ripples caused by the rotor slots (SC-1) is detected by combining the signals of several sense coils so that the fundamental voltage signal is cancelled or rejected and only the ripple voltages remain which is a signal proportional to speed. Further, the present invention provides for using a generator (220) to control voltage to the induction motor (222) with a PWM inverter (226) to control frequency signals to the induction motor (222).
Abstract:
An improved armature assembly (14) includes an armature stack (22) mounted coaxially with a rotatable shaft (26). Conductive windings (30) are disposed in the armature stack (22) in accordance with a preselected winding sequence. The conductive windings (30) include end turns (54) which extend longitudinally beyond the armature stack (22). End plates (68a, 68b) includes an integral banding ring in the form of a retaining flange (72) located radially outwardly of, and in a supporting relation to, the end turns (54). Each end band further includes a centrally located aperture (64) which is adapted to receive the rotatable shaft (26) and maintain concentricity of between end plate (68a, 68b), the armature stack (22) and the rotatable shaft (26).
Abstract:
This invention relates to an electric power generation and distribution system, and more particularly to an electric power distribution module for use in such systems, having an insulative support structure (22') which includes integral therewith electrically conductive buses (72a, b, c) and straps (74) which define a circuit for distributing electric power received from one or more power sources (200, 202 or 204) to one or more loads, the insulative support structure (22') also including integral therewith current sensors (88) for sensing a flow of electrical current in the electrically conductive buses (72a, b, c) and straps (74).
Abstract:
Nicking of the conductors (30) of the end turns (20) in the stator (10, 12, 14) of a dynamoelectric machine during the installation of a temperature sensor (26) is avoided by locating the temperature sensor (26) in a gap (22) between the coils defining adjacent end turns (20), thereby providing a machine capable of rapidly responding to excess heat even in a locked rotor situation before detectable levels of smoke, gas, and odors are generated.
Abstract:
This invention relates to a combustor heat shield assembly for a containment ring (64) for use in a radial inflow turbine engine having a compressed air supply and a combustor (32). The combustor heat shield assembly includes a turbine nozzle assembly (88) which is adapted for receiving a mixture of compressed air and combustion by-products delivered by the combustor (32) to drive a turbine impeller (22) of the radial inflow turbine engine about an axis of rotation (12). The turbine nozzle assembly (88) is integrally connected with and in close radial proximity to the containment ring (64). A heat shield (72), provided with slots (74), is coupled to the turbine nozzle assembly (88) and thermally adapted for providing a circumferentially uniform seal between the turbine nozzle assembly (88) and the heat shield (72) during operation of the radial inflow turbine engine.
Abstract:
A hermetically sealed semiconductor package (10, 100, 200) in accordance with the invention includes at least one integrated circuit (14, 15 or 16) with each integrated circuit having first (20) and second (22) opposed faces with the first face having at least one electrode (17-19) providing at least one first circuit connection to the integrated circuit with the second face providing a second circuit connection to the integrated circuit; a thermally conductive base (32) thermally coupled to the second face for conducting heat generated by operation of the at least one integrated circuit; an insulator (30) electrically isolating the first circuit connection from the second circuit connection; a sidewall (34) extending upward from the base.