Abstract: A generator having stator windings which are water cooled includes a plurality of sensors each for measuring the temperature of cooling water as it is discharged from respective sections of the stator windings and prior to its collection in a common manifold. The outputs of the sensors are combined to obtain an average reading and during an initialization process, each sensor reading is subtracted from the average to derive a correction factor for that particular sensor, for that particular average. The generator is operated so that other averages are selected for the calculation of other sensor correction factors. When operating on line, the correction factors are utilized to obtain a value for a percent of average coil temperature in accordance with the relationship: ##EQU1## where T is the temperature indication provided by the sensor, AVG is the average of all of the sensor readings, and CF is the appropriate correction factor for that sensor for that average.

Abstract: An improved end turn construction to improve cooling in a dynamoelectric machine and to axially reduce the size thereof. The machine includes a body (12) of magnetizable material having opposed ends (18) an opening (14) extending between the ends and the plurality of slots (50) about the opening (14). A rotor (16) is disposed within the opening (14) and journalled for rotation therein and electric conductors (52) are located in the slots (50) and extend to ends (54, 56) just past the ends (18) of the body (12). End turns (58, 60, 68) each interconnect a predetermined pair of the conductors (52) and extend substantially circumferntially and radially of the rotor axis with no appreciable extension axially of the axis.

Abstract: A variable output generator for supplying electrical power to a specific load is cooled by a plurality of motor driven fans 112, 113, 114, 115 disposed in a generator pit 2. An appropriate number of motor driven fans for providing cooling air for the generator are energized in response to the instantaneous generator output, to thereby avoid wasteful power consumption.

Abstract: A drive control system for controlling a drive motor in response to external command signals. The system comprises a first control arrangement for obtaining numerical values corresponding to amounts of successive intermittent operations of the drive motor responsive to respective external command signals, summing the obtained numerical values, and subtracting from a current sum of the numerical values a numerical value corresponding to a non-operation time period during which the drive motor is held at rest between the successive intermittent operations. The system further comprises a second control arrangement for inhibiting the operation of the drive motor responsive to the next command signal, for a length of time corresponding to the current sum after the drive motor has completed each of the intermittent operations, whereby the temperature of the drive motor is kept below an upper limit.

Abstract: A ventilation device for a rotating electric machine comprises a first side plate having an opening at the center near which a fan is placed, a second side plate placed facing the first side plate and a sucking chamber formed by a shielding plate which covers between both the side plates except for an intake port so as to feed cooling air by the fan from the intake port through the sucking chamber and the opening of the first side plate to the rotating electric machine body, wherein a whirling stream prevention plate for preventing the whirling of air flow in the sucking chamber is placed in the sucking chamber.

Abstract: A device for monitoring the leakage of cooling gas for a turbogenerator stator into the stator water-cooling system is disclosed. The device is located next to the generator so that the operative elements are at the generator storage tank operating water level. As cooling accumulates in the storage tank together with cooling water, the gas displaces the water in the leak monitor until the water level rises to a predetermined, adjustable level. When this level is reached, the gas is vented and the water level is restored to equilibrium. Each cycle is recorded on a leak trip counter. When the leakage rate exceeds a predetermined value, an alarm is triggered.

Abstract: A normally lubricated bearing, typically a ball bearing, serves to transmit torque from a drive shaft for the fan wheel of an alternator. The driving and driven bearing surfaces form the coupling parts respectively on the drive side and the delivery side of the coupling. A cup spring is useful to control the bearing friction that must be overcome at a limiting speed at which the drive shaft begins to turn faster than the driven device. Such couplings are useful for engine fans, pumps, or other similar auxilary devices in motor vehicles.

Abstract: Method of balancing an electrical machine rotor comprising starting the liquid cooling system of the rotor winding formed of parallel hydraulic branches arranged on the body of the rotor, monitoring the variables of the cooling conditions of said branches, with the liquid cooling system under operation, for determining temperature asymmetry which leads to heat unbalance of the rotor, and altering hydraulic resistance in said branches so that the proportion of said variables provide the same magnitude of overheating of the liquid at least in each pair of the diametrically arranged branches of the cooling system.

Abstract: An apparatus is provided for rapidly restarting the flow of coolant through the cold electromagnetic shield of a superconducting rotor following a thermal transient episode. A vortex diode inhibits coolant flow in the undesirable reverse direction and encourages the reestablishment of a normal thermosyphon cooling loop flow quickly following the termination of a thermal transient such as that caused by transmission line faults. The present invention requires no moving parts and may therefore be permanently sealed in the superconducting rotor without risk of costly repair efforts caused by components failure.

Abstract: Apparatus to maintain a thermally insulating vacuum in a rotor of a turbogenerator with a superconductive excitation winding is disclosed. A sorption pump is mounted within the rotor in close proximity to the superconductive winding. The cooling system for the superconductive winding also serves to cool the sorption pump. The pump includes an arrangement for protecting the adsorbent material from radiation. The radiation protection is in the form of offset openings in the pump housing to form a labyrinth. Chambers are provided in the pump for the adsorbent material. These chambers are separated by walls or screens to retain the adsorption material in place as the rotor turns. The sorption pump is provided with a heating device in order to regenerate the adsorbent material.

Abstract: A dynamoelectric machine's segmented baffle assembly comprises a baffle ring which is bolted to a back-up plate disposed in the stator core. The annular-shaped baffle ring is formed from a plurality of arcual segments, each segment secured by at least one of said bolts. For low flow rates of coolant gas, the air gap can be further reduced by means of a teflon insert located on the inner circumferential surface of the baffle ring. For expeditious access to the rotor assembly, only one of said segments need be.

Abstract: Cooling system for a rotor of an electric machine having a superconductive field winding and formed of a rotor drum with at least one outer, substantially hollow cylindrical rotor body with a co-rotating cold shield, an inner hollow rotor body fastened at given locations within the outer rotor body so as to be thermally insulated and serving as a coil-winding support, the fastening locations at the outer rotor body being cooled, and a co-rotating mixing chamber located at the inner periphery of the inner hollow rotor body and containing a phase mixture of a coolant fed thereto from the outside, the phase mixture forming, during rotation of the rotor, a radially outwardly flung liquidring and a radially inner vapor column coaxial thereto, including channels for conducting a first coolant flow with liquid coolant from the mixing chamber for cooling the field winding and a second coolant flow with at least partly vaporized coolant for cooling the fastening locations and for returning the first coolant flow, afte

Abstract: An improved turbo-generator unit for a sea power plant having a wall separating the sea from a space at atmospheric pressure has the turbine submerged in the sea on one side of the wall, the generator in the atmospheric space and a common shaft sealingly extending through the wall. The turbine motive fluid is a halocarbon vapor while the generator is cooled with a halocarbon refrigerant having a closed circuit which includes a fluid-tight generator housing.

Abstract: A leakage measuring apparatus and method is herein provided for a gas-cooled, liquid-cooled dynamoelectric machine's cooling system. The apparatus comprises: a liquid coolant reservoir; an integrating vessel; a flow restriction means such as an orifice, orifice covered by a porous membrane, or a needle valve; a pressure relief valve which is hydraulically connected between the liquid coolant reservoir and the integrating vessel; and means for gaging the pressure within the integrating vessel, said pressure indicative of the amount of leakage within the cooling system. The effect obtained by the gaging of the pressure in the integrating vessel is: (1) the integration of the pressure surges resulting from the intermittent activation of the pressure relief valve; and (2) the amplification, for gaging purposes, of the pressure changes in the reservoir, these changes caused by the existence of leakage.

Abstract: Arrangement for cooling the rotor of an electric machine, including a superconducting field winding, a cold shield surrounding the winding, and a mixing chamber containing a phase mixture of coolant fed in, a stream of liquid coolant for cooling the winding and a stream of partially evaporated coolant for cooling the cold shield, the second stream being conducted through the cold shield and returned from the machine in an outer loop, the first stream being conducted through inner loops, through cooling canal sections of conductors, and returned to the chamber, the coolant in the loops being transported by the self-pumping effect of the rotor, the inner loops having radial entrance and exit branches distributed over the length and circumference of the rotor and winding, chamber sections associated with the inner loops, the chamber sections having an axial length and radial height forming pockets leading into the entrance branches for coolant which is cooler than the average temperature of the liquid phase and

Abstract: An integrated drive-generator system in which a casing housing a constant speed drive unit is attached to a casing housing a generator unit with means being provided to isolate mechanically debilitating debris within the unit which expelled it and so avoid damaging the other unit. The units share a common lubrication-coolant fluid system which provides fluid circulation to both from a reservoir. Expelled debris is isolated within the faulty unit by a barrier partition which separates the interiors of the units' casings and supports a breather which promotes fluid communication between the units' casings and permits a single pressurizing device to service both units. A scavenge pump for extracting fluid from each unit and transmitting it to the reservoir is located within the unit it services. As a result, if debris expelled by either unit becomes entrained in the fluid of that unit, only the scavenge pump within that unit will be damaged or jammed and system repair will be limited to the faulty unit.

Abstract: An evacuating device for generating an insulating vaccum around the superconducting winding of the rotor of an electric machine with an inner space which is surrounded by the winding and is permeated by the magnetic field of the winding in which a co-rotating ionization getter pump operating according to the sputter principle is diposed in the inner space and has at least two electrodes arranged perpendicular with respect the magnetic field eliminating the need for rotating sealing elements at a terminal head of the rotor.

Abstract: An electrical machine with an axial-flow fan and a two-part ventilator encasing is disclosed. One part of the ventilator encasing is non-moveable with respect to the fan blade of the axial-flow fan. The second encasing part is moveable with respect to the fan blade, and can be moved from a first position in which the moveable encasing part is adjacent to the fan blade to a second position axially displaced from the first position. The axial movement of the moveable encasing part facilitates maintenance and disassembly work on the machine which require a significant clearance between the fan blade and the encasing. The moveable encasing part is moveably mounted on a bearing bracket associated with the shaft of the rotor of the machine. The shaft of the rotor is used to coaxially position the moveable encasing part with respect to the axial-flow fan and the axial-flow fan blade.

Abstract: A rotor for electrical machine comprises poles and a winding made of hollow conductors forming hydraulic loops connected in parallel to a cooling liquid supply system, in each hydraulic loop a conductor for discharging cooling liquid is disposed at a greater distance from the rotor axis than a conductor for supplying cooling liquid, and is fitted with a bent tip capable of rotation around the axis of said conductor.

Abstract: Turning, or pre-swirl, vanes are housed in stationary walled annular passages located in juxtaposition with coolant gas supply slots through which coolant gas, usually air, enters the rotor structure of a rotor rim-ventilated generator. Coolant gas flow admitted through the annular passages is turned in the direction of the rotor rotation and provided with an initial tangential velocity by the turning vanes.

Abstract: The invention relates to an arrangement for cooling the rotor of an electric machine, especially a turbine-type generator. The rotor contains a superconducting field winding, a co-rotating cold shield and a co-rotating mixing chamber for receiving a phase mixture of a coolant. A first coolant stream with a liquid coolant is further provided for cooling the field winding and a second coolant stream for cooling the cold shield. A substream derived from the first coolant stream after the latter has passed through the field winding is admixed to the second coolant stream and that a corresponding connecting line is provided with a throttling device.

Abstract: An arrangement for cooling an electric machine such as a turbo generator having a rotor with an excitation winding which must be cooled to a low temperature, the excitation winding concentrically surrounded by a cooled damper winding in which separate cooling loops are provided for cooling the excitation winding, the damper winding and the current supply and/or discharge lines to permit the refrigeration power necessary to remove losses to be adapted to the actual losses in the machine and to be kept relatively small.

Abstract: An integral nozzle-shield assembly for a gas-cooled dynamoelectric machine such as a large turbine-driven generator is described. The nozzle-shield assembly is formed of a non-conductive, non-magnetic material such as molded fiberglass and resin and serves to channel hydrogen gas between a heat exchanger and a rotor-mounted fan used to pump the gas through coolant passages in the dynamoelectric machine, and the assembly also provides a labyrinth seal over the fan blade tips. In one embodiment, the nozzle-shield assembly includes two 180-degree halves whose thickness varies circumferentially and which may be installed in a generator by bolting their outer edges to a stator frame member of the generator and bolting the halves together at the two radial joints between halves using flat metal plate connectors.

Abstract: A current/flow comparator for generating an alarm signal whenever the instantaneous flow rate of a coolant fluid cooling the armature of a dynamoelectric machine falls below a predetermined percentage of a desired instantaneous flow rate, which desired flow rate varies as a function of the square of the instantaneous current flowing through the armature, is disclosed.

Abstract: Disclosed is a dynamoelectric machine with a tubular shaped stator assembly having a generally cylindroid rotor assembly mounted therein. There is a clearance between the outer circumference of the rotor and the inner circumference of the stator for the passage of cooling gas. On one end of the stator assembly there is mounted a dual position air gap baffle assembly. In one position the baffle assembly will regulate the flow of cooling gas in the clearance space between the dynamoelectric machine's stator and rotor; and in the other position, there is a keystone shaped opening which will make the rotor assembly accessible.

Abstract: A combination baffle and deflector for guiding ventilating air in and around a dynamoelectric machine is characterized by incorporating an annulus having integrally formed base, leg and rim portions that enable the baffle and deflector member to be mounted on one end of a dynamoelectric machine to provide optimum air flow control while also providing apparatus for blocking entry of rodents, snakes, and other similar foreign objects into the machine. In a combined form of the invention the unique baffle and deflector member is assembled with an electric motor that has a plurality of axially extending, radially projecting cooling ribs on an exterior surface of its housing. Fin portions integrally formed with the baffle and deflector member are disposed to cooperate with the cooling ribs on the motor housing to provide an efficient and inexpensive screen over one portion of the ventilating passageways through the motor.

Abstract: A reverse flow cooled dynamoelectric machine is provided with an annular baffle disposed in the gap thereof and spaced from stepped core laminations at the end region for improving the cooling of those laminations. The baffle directs a flow of cooling gas across the laminations increasing the velocity of the flow. The baffle is mounted on the stator and comprises an annular member of electrically non-conducting material having a generally triangular cross section with a rounded nose. The baffle may be formed from a plurality of arcuate segments for ease of installation.

Abstract: A closed loop forced liquid cooling system has provision for continuously separating dissolved gas from the cooling liquid. A gas separator is combined with a liquid-gas interface pressurizer to establish favorable temperature and/or low pressure conditions for preferential gas evolution. By preventing bubble formation in liquids cooling electronic and electrical equipment, dielectric breakdown of the cooling liquid is averted.

Abstract: The invention is directed to a leak indicating apparatus for the closed cooling system of an electric machine. The elevation of the coolant level in the expansion tank of the cooling system as well as the measured average temperature of the coolant are translated into electrical signals which are compared with each other. Only when there is a deviation from the normal volume-temperature proportionality and after a time delay, is replenishing coolant supplied or an indicating device actuated.

Abstract: To enhance the cooling of an alternator stator, each end of the stator including the end turns of the stator wires is enclosed in a fluid tight assembly containing a matrix of ceramic balls. Since the stator wires are contained in slots in the stator laminations, cooling of the stator wires is facilitated by the cooling fluid flowing parallel to the stator wires in the stator slots from one end assembly to the other end assembly with the ceramic balls assuring uniform coolant flow through the stator slots. An external fluid passage contains a pressure drop orifice resulting in a pressure differential between the end assemblies so that a certain proportion of the cooling fluid will flow through the stator slots.

Abstract: A dynamo-electric machine of the gas-cooled type, for example, an induction of synchronous machine is comprised of a casing which houses a rotor and a stator. A gas-coolant inlet space is provided within the casing at each end thereof and a gas-coolant outlet space is provided between the periphery of the stator and the inner surface of the casing. The internal space occupied by the stator and rotor components is separated from the gas-coolant inlet spaces provided within opposite end portions of the casing and the gas-coolant is force-circulated from the inlet spaces in a radially outward direction through radially extending slots provided in the rotor and stator to the outlet space, the rotor slots functioning as a centrifugal fan in establishing the forced circulation of the gas-coolant through the machine.

Abstract: In liquid cooled rotors of turbogenerators with half-turn cooling and cooling water feed at the dynamo side as well as cooling water discharge through a collecting chamber on the turbine side, the cooling water collecting chamber is arranged within the generator housing, axially immediately adjacent to the receiving chamber, and is sealed against the rotor shaft by labyrinth rings through which is provided, as a barrier, a flow of the cooling gas for the generator housing.

Abstract: The method includes maintaining the coolant circulation in a fluid-cooled hydropower generator also when the hydropower generator is shut down, and interrupting only the coolant circulation of the heat exchangers when the generator is in the shutdown condition. The leakage and conductivity control means of the circulation system are in constant operation.