Abstract: To provide a rotating electric machine capable of accurate detection of coil temperature by causing refrigerant to flow so as not to contact a temperature detecting element provided on a coil end portion. A rotating electric machine (10) comprises: a cylindrical stator core (12); coils (16) wound around a plurality of teeth (14) projecting from an inner circumferential surface of the stator core (12) and having coil end portions (18) protruding beyond respective end portions in an axial direction of the stator core (12); a cooling part (50) to cool the coil (16) by dropping refrigerant onto the coil end portions (18); and a temperature detecting element (30) placed in contact with the coil end portion (18), for detecting coil temperature. The temperature detecting element (30) is provided so as not to directly contact the refrigerant flowing on the coil end portion.

Abstract: An electric motor which has a separate end cap heat exchanger, through which a liquid coolant is passed, is disclosed. In one example embodiment, the electric motor is a traction motor or motor-generator in a hybrid electric vehicle having an internal combustion engine. Additionally, in one embodiment, the heat exchanger has a low-temperature coolant loop configured to extract energy from the motor coolant. The electric motor may be installed in a variety of vehicles or other applications having greatly differing cooling requirements. By placing the heat exchanger and control componentry in the end cap, the cooling capability of the electric motor can be changed by selecting an end cap with the appropriate heat transfer characteristics and control componentry to provide the desired cooling. Consequently, a single electric motor, with a variety of end cap choices, can be used in a variety of applications.

Abstract: An electrical machine having a rotor component configured to rotate with respect to a stator component includes a sensing arrangement to sense electrical, magnetic, and/or mechanical machine parameters during machine operation. The electrical machine also includes a fluid sprayer coupled to a cooling controller. The cooling controller activates the fluid sprayer to spray cooling fluid on a portion of the electrical machine in response to in response to the sensed electrical, magnetic, and/or mechanical machine parameters.

Abstract: A rotating electrical machine (100) is driven by a three-phase AC current and is provided with a stator core (13), a molded resin (12) for covering a coil wound on the stator core, a rotor core (40), a shaft (11) provided to the rotor core (40), a terminal base (20) provided to a coil end section, and a case (30) for covering the rotating electrical machine (100). Power cables extending from the terminal base (20) are led out of the case (30) through a case terminal box (31). A temperature sensor (22) is affixed in a hole in the molded resin (12) by the terminal base (20) and measures the temperature in the vicinity of a heat producing source.

Abstract: A coolant flow reduction monitoring system for a rotary electric machine having stator coils within a plurality of slots of a stator thereof is provided. The stator coils are cooled by a coolant flowing in a plurality of passages provided in the stator coils. The system includes an outlet temperature sensor for measuring a coolant outlet temperature of the coolant in an outlet of at least one of the plurality of passages, a slot temperature sensor for measuring a temperature in at least one slot at a location along a length of each slot and outside of the stator coils, and an inlet temperature sensor for measuring a coolant inlet temperature of the coolant. A coolant flow reduction monitor generates an alarm indicating a coolant flow reduction based on the at least one coolant outlet temperature, the at least one slot temperature and the coolant inlet temperature.

Abstract: A motor-generator which is a rotating electrical machine is provided with a coil end cover and a plurality of connecting wires. The coil end cover forms a cooling oil passage around a coil end portion and a cooling oil passage around a coil end portion, and a cooling oil communicating passage that communicates the cooling oil passage with the cooling oil passage on the inside of the stator core. The plurality of connecting wires are provided in the cooling oil passage. The direction in which the cooling oil flows in the cooling oil passage is the same as the direction in which the connecting wires extend at an angle from the radial outside to the radial inside of the stator core. The flowrate of cooling oil in the cooling oil passage is set larger than the flowrate of cooling oil in the cooling oil passage.

Abstract: A high power density generator contains an armature structure having a plurality of conductors and at least one heat transfer tube thermally coupled to the conductors. The tube is hollow so as to allow a heat transfer fluid to pass through it. The tube is made of a material having a thermal conductivity ? of at least 20 W/mK, an electrical breakdown strength of at least 60 V/mil, and a mechanical strength adequate for handling, manufacturing and operation. In an embodiment of the invention, the tube is made of a ceramic material.

Abstract: The electric rotating machine includes a rotor, a stator having a stator core and a stator winding wound on the stator core, and a cooling liquid feeding function of applying cooling liquid to the coil end of the stator winding. The stator winding constituted by coils wound along the circumferential direction includes crossover portions each of which electrically connects the ends of two of the coils through which currents in the same phase flow, respectively. The crossover portions are arranged so as to overlap one another only partially in the circumferential direction. The cooling liquid feeding function applies the cooling liquid to at least one of the crossover portions.

Abstract: A vehicle motor system includes a motor that receives cooling fluid flow from two different cooling sources. A control, such as a valve, selectively changes the cooling flow between the two cooling sources in response to an operational state of the vehicle.

Abstract: The invention aims at providing a forced cooling rotary electric machine capable of bringing temperature distribution close to a designed temperature distribution and avoiding becoming a larger size, and employs a wedge formed with ventilation grooves and a wedge not formed with the ventilation grooves to regulate the flow rates of cooling gas passing through air ducts, so that the cooling gas supplied to a part of a stator core, in which temperature is low, can be caused to flow positively to a part in which the temperature is high and the temperature distribution in the axial direction of the stator core can be uniformized. As a result, the temperature distribution in the axial direction of the stator core can be brought close to a designed temperature distribution, and a forced cooling rotary electric machine that need not be made larger in size with a margin can be obtained.

Abstract: A lithographic device includes a cooling device for removing heat from a motor. The cooling device has a cooling element provided in thermal contact with at least part of the motor. The cooling device further has a cooling duct assembly with a supply duct to supply a cooling fluid to the cooling element, and a discharge duct to discharge the cooling fluid from the cooling element. A pump causes the cooling fluid to flow through at least part of the cooling duct assembly. A flow control device controls a flow rate of the cooling fluid through at least part of the cooling duct assembly, to maintain a predetermined average temperature of the cooling fluid in the cooling element.

Abstract: A cooling device for current lines of a superconducting rotating machine, which is capable of removing heat generated from the current lines of the superconducting rotating machine, thereby effectively preventing a superconducting coil from being deformed due to the heat generated from the current lines, is disclosed. The cooling device includes heat conduction members respectively mounted to outer surfaces of the current lines. Each heat conduction member is in contact with an inner peripheral surface of the stator such that the heat conduction member transfers, to the stator, heat generated from a corresponding one of the current lines. The heat conduction member further includes insulators each surrounding a corresponding one of the current lines between a corresponding one of the heat conduction members and a power slip ring arranged in the stator, to thermally insulate the heat generated from the corresponding current line.

Abstract: A dynamoelectric machine, such as a totally enclosed fan cooled (TEFC) induction motor has a double-wall bearing housing heat shield that envelops and thermally isolates the bearing housing from the rest of the motor housing interior. The shield defines an air channel between the shield outer and inner walls. Optionally the air channel may be constructed to enable circulating air flow through a shield intake in communication with an air flow source, such as air ducted from the TEFC motor axial cooling fan. The air channel also defines an exhaust. Air flow within the air channel transfers heat out of the motor housing, lowering bearing housing operating temperature. Air flow rate may be varied in response to motor operational parameters.

Abstract: The invention aims at providing a forced cooling rotary electric machine capable of bringing temperature distribution close to a designed temperature distribution and avoiding becoming a larger size, and employs a wedge formed with ventilation grooves and a wedge not formed with the ventilation grooves to regulate the flow rates of cooling gas passing through air ducts, so that the cooling gas supplied to a part of a stator core, in which temperature is low, can be caused to flow positively to a part in which the temperature is high and the temperature distribution in the axial direction of the stator core can be uniformized. As a result, the temperature distribution in the axial direction of the stator core can be brought close to a designed temperature distribution, and a forced cooling rotary electric machine that need not be made larger in size with a margin can be obtained.

Abstract: A brushless alternating current generator for vehicles comprises a stator, rotor, field winding, rectifier, housing, cover, and extension member. The rectifier has plural rectifying elements to rectify a voltage from the stator winding and output the rectified voltage and a radiating fin to which the rectifying elements are attached. The housing has a side wall and houses both the stator and the rotor and has an end face to which electric parts including the rectifier are attached. The side wall is along the axial direction. The end face is along the radial direction. Both the side wall and the radiating fin are mutually adjacent to provide a gap in the radial direction. The cover encloses the end face of the housing and has plural air inlets that takes in cooling air. The extension member is secured to the cover and extends into the gap in the axial direction.

Abstract: A turbomachine such as an aircraft turbojet including an electrical generator/starter that can be mounted and dismounted by axial translation in an upstream enclosure of the turbomachine between the low-pressure compressor and the high-pressure compressor, and couple to electrical cables which extend inside the structural arms of the intermediate casing of the turbomachine.

Abstract: An electric motor which has a separate end cap heat exchanger, through which a liquid coolant is passed, is disclosed. In one example embodiment, the electric motor is a traction motor or motor-generator in a hybrid electric vehicle having an internal combustion engine. Additionally, in one embodiment, the heat exchanger has a low-temperature coolant loop configured to extract energy from the motor coolant. The electric motor may be installed in a variety of vehicles or other applications having greatly differing cooling requirements. By placing the heat exchanger and control componentry in the end cap, the cooling capability of the electric motor can be changed by selecting an end cap with the appropriate heat transfer characteristics and control componentry to provide the desired cooling. Consequently, a single electric motor, with a variety of end cap choices, can be used in a variety of applications.

Abstract: An automotive alternator mounted on a vehicle for generating electric power includes front and rear frames, a cylindrical stator and a rotor. The cylindrical stator is contained in the frames, and the rotor is rotatably supported in the cylindrical stator. A rectifier device for rectifying alternating current generated in the stator into direct current is mounted on a rear surface of the rear frame and covered with a rear cover. To sufficiently cool minus rectifier elements positioned at a place not easily cooled only by the outside cooling air introduced into the alternator, a base portion of the minus rectifier element is contacted to the rear frame thereby to establish heat conduction therebetween. A resilient heat-conductive member is disposed between the base plate and the rear frame to absorb any dimensional discrepancies therebetween.

Abstract: A spray cooled motor system with a motor housing with an interior and an exterior, a stator mounted within the interior of the motor housing, a rotor mounted within the interior of the motor housing, a coil winding mounted within the interior of the motor housing, a plurality of atomizers configured to spray a coolant on at least one of the stator and the rotor, a coolant pump in fluid communication with the plurality of atomizers; and an output shaft extending through an output shaft aperture from the interior to the exterior of the motor housing.

Abstract: A cooling device of an electric motor for a vehicle for receiving cooling air into the electric motor through a suction port according to the rotation of a rotor shaft on which a rotor core, which is disposed opposite to a stator core, is installed. The cooling device includes an air volume regulating mechanism regulating a cooling air volume received therein through the suction port according to an ambient temperature. Since the cooling air volume received in the cooling device through the suction port is regulated according to the ambient temperature, the cooling of the electric motor can be optimized, and noise generated can be efficiently reduced according to the ambient temperature.

Abstract: A machine has a rotor, that can be rotated about an axis, with a superconductive winding that is coupled in a heat-conducting manner to a central coolant area of a fixed heat conducting body proturding into a hollow of the rotor via a winding carrier and a heat contact gas. The coolant area forms a line system with the line parts thereof, that are laterally connected thereto, and a condenser area of a cold unit, in which a coolant circulates in the line system as result of a thermosiphon effect. To maintain the supply of coolant to the central coolant area, even when the rotor encounters difficulties, the coolant area is provided with a lining of a porous material, preferably a sinter material, having high thermal conductivity.

Abstract: A cooling flow bifurcation member is positioned in an outside radial flow passage of a generator between an end portion of a stator core and a stator flange. The flow bifurcation member includes a main body portion having a tapered surface that transforms a first flow having a first velocity passing into the outside radial flow passage into at least one other flow having another velocity. The at least one other flow is directed along at least one of an outer surface of the end portion of the stator core and the stator flange.

Abstract: A baffle for guiding cooling fluids in a power generator cooled by a cooling fluid and having a flange, a stator, and an end stator has an inclined surface configured to direct a first portion of the cooling fluid flow towards the flange, a second portion of the cooling fluid flow towards the end stator and a third portion of the first portion towards an angled surface of the flange.

Abstract: A rotary electric machine which is smoothly operated with high efficiency by adequately controlling the cooling gas flow as needed to keep the highest temperature inside the rotary electric machine below a predetermined limit. The rotary electric machine includes a stator with armature windings wound around a stator core, a rotor placed inside the stator in a rotatable manner, and a cooling device for controlling cooling gas flow. It further includes a device for measuring an ambient temperature and a device for detecting armature voltage and/or armature current and/or field current. The temperature inside the rotary electric machine is calculated from the measured ambient temperature, detection value by the detecting device and an directive value of cooling gas flow. And a calculated suitable value of cooling gas flow is determined according to the calculated temperature inside the rotary electric machine.

Abstract: An electric machine system includes an electric machine and a companion device. The electric machine has a stationary member and a movable member that, by interaction of magnetic fields, at least one of moves relative to the stationary member or generates electricity when moved relative to the stationary member. One of the stationary member and the movable member includes a permanent magnet. The companion device is coupled to the electric machine to communicate mechanical movement with the movable member. In certain instances, the electric machine system has adaptations for operation of the electric machine system subsea and/or in a corrosive environment.

Abstract: A rotary electric machine for vehicles is provided, which includes a rotor, a stator disposed opposed to the rotor, a frame made of aluminum and supporting the rotor and the stator, and a rectifier secured to an outer end face of the frame and having low-loss elements as rectifying elements. A heat insulator is disposed between the rectifier and the frame. With this configuration, deterioration can be prevented in the overall cooling properties, while at the same time the cooling properties of the rectifier can be enhanced.

Abstract: Electromagnetic components are provided with a heat exchange mechanism. For example, a fluid-cooled electromagnetic field-functioning device, such as a motor, generator, transformer, solenoid or relay, comprises one or more electrical conductors. A monolithic body of phase change material substantially encapsulates the conductors or an inductor. At least one liquid-tight coolant channel is also substantially encapsulated within the body of phase change material. The coolant channel may be part of a heat pipe or cold plate. The coolant channel may be made by molding a conduit into the body, using a “lost wax” molding process, or injecting gas into the molten phase change material while it is in the mold. The coolant channel may also be formed at the juncture between the body and a cover over the body.

Abstract: A rotary electric machine includes: a stator, a rotor and rotor fans contained in a closed type frame. The cooling gas is circulated in the frame by the rotor fans and warmed as a result of heat exchange with the stator and the rotor is cooled by a gas cooler. A heat pump is adapted to use cooling water or ambient air as high temperature heat source and liquid coolant as low temperature heat source. A liquid coolant circulation system for supplying liquid coolant to the heat exchange section of the gas cooler is provided. The liquid coolant is cooled by the heat pump and is supplied to the heat exchange section of the gas cooler by means of the coolant circulation system.

Abstract: A cooling system for use in a vehicle drive assembly having an electric drive with a rotor and a stator is disclosed. The cooling system is adapted to cool the rotor via a liquid coolant or by directing a cooling air flow between the rotor and stator using an independent control capable of independent operation.

Abstract: The present invention includes temperature transition estimating means 24, 25 for estimating a temperature transition of an electric motor 1 caused by the passage of electric current through the electric motor 1, an electric pump 8 as coolant supplying means for supplying a coolant to the electric motor, and coolant supply control means 26 to 28 for controlling the pump 8 according to the temperature transition of the electric motor 1 and the coolant temperature. The amount of operation of the electric pump 8 is determined from the temperature transition and the coolant temperature. This structure makes it possible to prevent overheating of the electric motor properly using the coolant while minimizing the energy consumption involved in using the coolant.

Abstract: Cooling systems and methods are provided for an integrated electric motor-inverter, where the integrated electric motor-inverter includes a housing, a motor, and an inverter, the motor and the inverter are disposed within the housing, and the motor includes a stator. The system includes a cooling jacket, a first coolant, a condenser, a spray head, and a second coolant. The cooling jacket is disposed concentric to the stator and includes an inner wall and an outer wall. The inner wall is in direct contact with the stator. The first coolant is disposed between the cooling jacket inner and outer walls. The condenser is disposed concentric to the cooling jacket. The spray head is disposed adjacent the inverter. The second coolant is in flow communication with the spray head.

Abstract: A rotary electric machine which is smoothly operated with high efficiency by adequately controlling the cooling gas flow as needed to keep the highest temperature inside the rotary electric machine below a predetermined limit. The rotary electric machine includes a stator with armature windings wound around a stator core, a rotor placed inside the stator in a rotatable manner, and a cooling device for controlling cooling gas flow. It further includes a device for measuring an ambient temperature and a device for detecting armature voltage and/or armature current and/or field current. The temperature inside the rotary electric machine is calculated from the measured ambient temperature, detection value by the detecting device and an directive value of cooling gas flow. And a calculated suitable value of cooling gas flow is determined according to the calculated temperature inside the rotary electric machine.

Abstract: A cooling device of an electric motor for a vehicle for receiving cooling air into the electric motor through a suction port according to the rotation of a rotor shaft on which a rotor core, which is disposed opposite to a stator core, is installed. The cooling device includes an air volume regulating mechanism regulating a cooling air volume received therein through the suction port according to an ambient temperature. Since the cooling air volume received in the cooling device through the suction port is regulated according to the ambient temperature, the cooling of the electric motor can be optimized, and noise generated can be efficiently reduced according to the ambient temperature.

Abstract: A power supply for an electric motor includes a converter that can increase and decrease a voltage supplied into an inverter and then into the stator windings of the motor. As a separate feature, the inverter includes a control coil which is positioned within a motor housing such that it may be cooled by a thermal management system for the motor.

Abstract: A cooling flow bifurcation member is positioned in an outside radial flow passage of a generator between an end portion of a stator core and a stator flange. The flow bifurcation member includes a main body portion having a tapered surface that transforms a first flow having a first velocity passing into the outside radial flow passage into at least one other flow having another velocity. The at least one other flow is directed along at least one of an outer surface of the end portion of the stator core and the stator flange.

Abstract: An electric motor (10) wherein the housing (12) comprises a sleeve (42) having a vent opening (110) extending therethrough. The motor cover (22) has a diaphragming portion (140) overlaying the vent opening (110). The diaphragming portion (140) adheres against the sleeve (42) to close the vent opening (110) when pressure within the motor chamber (14) is less than ambient pressure, thereby preventing the passage of air from the chamber (14). The diaphragming portion (140) lifts from the sleeve (42) to open the vent opening (110) when pressure within motor chamber (14) is greater than ambient pressure, thereby allowing the passage of air from the chamber (14).

Abstract: A moveable object carrier is moveable in a first direction and in a second direction to be positioned in a plane. The object carrier may be moved in the first direction by a first and a second linear actuator. The first and second linear actuators are adapted to support the object carrier. Thereto the linear actuators may comprise additional bearing and the linear actuators are positioned relative to the object carrier such that no other bearing is required to prevent the object carrier from falling or tilting. The object carrier may be moved in the second direction by a third and a fourth linear actuator, which linear actuators may be adapted to support the first and the second linear actuators.

Abstract: A component of an electric machine 46, the component comprising a core 10; two or more teeth 14 extending radially therefrom; at least one electromagnetic winding 12, each winding 12 around at least one of the teeth 14; wherein the core 10 having a cooling arrangement including at least one cooling insert 48 located between adjacent windings 12 and whereby in use a cooling fluid being arranged to flow through the at least one cooling insert 48 to facilitate heat transfer and dissipation from the electromagnetic windings 12. The cooling inserts providing improved cooling, structural support to the windings, and electrical insulation between the windings and the core.

Abstract: Certain exemplary embodiments can comprise a method, which can comprise obtaining an electric motor cooling fan. The electric motor cooling fan can be adapted to be operatively coupled to a motor enclosure of an electric motor. The motor enclosure can be configured in a ventilation pattern selected from a plurality of ventilation patterns.

Abstract: The invention aims at providing a forced cooling rotary electric machine capable of bringing temperature distribution close to a designed temperature distribution and avoiding becoming a larger size, and employs a wedge formed with ventilation grooves and a wedge not formed with the ventilation grooves to regulate the flow rates of cooling gas passing through air ducts, so that the cooling gas supplied to a part of a stator core, in which temperature is low, can be caused to flow positively to a part in which the temperature is high and the temperature distribution in the axial direction of the stator core can be uniformized. As a result, the temperature distribution in the axial direction of the stator core can be brought close to a designed temperature distribution, and a forced cooling rotary electric machine that need not be made larger in size with a margin can be obtained.

Abstract: The invention relates to a vehicle comprising at least one electromotor for driving the vehicle, an actuator for controlling the supply of electric power to the electromotor and a power system for providing electric power to the electromotor drive of the vehicle, which power system is provided with first energy storage means for storing a quantity of energy and having a power discharge capacity, first measuring means for measuring the energy condition of the first energy storage means, first power generating means for generating electric power, a computer system, operationally connected to the actuator for receiving a power demand, to the first measuring means for receiving a first energy condition value, and to the first power generating means, wherein the first energy storage means are operationally connected to the electromotor for supplying power thereto, the first power generating means are operationally connected to the first energy storage means for supplying energy thereto, and the computer system con

Abstract: A cooling system for an electrical motor or generator includes a first cooling loop, a second cooling loop, and a heat exchange system. The first cooling loop may extract heat from an iron stack and winding of the electrical motor or generator. The second cooling loop may extract heat from end turns of the stator winding, the rotor, and the bearings independently from and simultaneously to the first cooling loop. At least the first cooling loop may pass through the heat exchange system. A liquid coolant may circulate in the first cooling loop and a compressed gas, such as compressed air or compressed refrigerant in vapor form, may circulate in the second cooling loop. The cooling system and method for an electrical motor or generator may be suitable for, but not limited to, applications in the aircraft and aerospace industries, such as driving a cabin air compressor of an aircraft.

Abstract: A spray cooled motor system with a motor housing with an interior and an exterior, a stator mounted within the interior of the motor housing, a rotor mounted within the interior of the motor housing, a coil winding mounted within the interior of the motor housing, a plurality of atomizers configured to spray a coolant on at least one of the stator and the rotor, a coolant pump in fluid communication with the plurality of atomizers; and an output shaft extending through an output shaft aperture from the interior to the exterior of the motor housing.

Abstract: The present invention provides a stator assembly for an electromechanical hybrid transmission. The stator assembly is generally annular and defines a centrally located rotor aperture configured to accommodate a rotor. The stator assembly includes a stator core having a plurality of radially inwardly extending stator teeth, and a stator wire wound around each of the stator teeth to form a plurality of stator coils. Epoxy resin is applied between each pair of adjacent stator teeth. The epoxy resin defines a plurality of stator cooling channels located in close proximity to the stator coils, and a plurality of rotor cooling channels located in close proximity to the rotor aperture. A cooling medium is disposed within the stator cooling channels and the rotor cooling channels such that the stator coils and a later assembled rotor can be cooled.

Abstract: An electric machine includes a fluid control system that is configured to regulate the flow rate of fluid to the electric machine. The machine includes a sensor that senses a parameter representative of cooling required by the machine. The sensor supplies a sensor signal to a control unit, which in turn supplies a flow control signal to a flow regulator. The flow regulator, in response to the flow control signal, controls the flow rate of fluid to the machine to what is needed for effective cooling at current operating conditions. As a result, windage losses and pumping power requirements in the machine are reduced, and machine efficiency is increased.

Abstract: A system and method of cooling motors of a lithographic tool. The system includes a temperature-adjusting device which adjusts the temperature of a heat transfer fluid to a boiling temperature that is substantially equal to the desired motor housing temperature. The system further includes a fixed or adjustable pressure device which adjusts the pressure of the heat transfer fluid to a predetermined level to maintain the boiling temperature. The boiling temperature remains substantially constant as the heat generated by the motor is absorbed by the heat transfer fluid. A pump pumps the heat transfer fluid through the temperature adjusting device, the pressure device and the motor. The system functions as a closed-looped system with the addition of a condenser/heat exchanger.

Abstract: A control device includes a shot-pulse control unit that provides, at a time of starting a synchronous motor, a predetermined current to each phase of a stator of the motor for a short time; a detecting unit that detects a current flowing through each phase when the predetermined current is provided; an estimating unit that estimates a position of the rotor by comparing detected values; a voltage control unit that controls application of a voltage to the synchronous motor based on a high-pressure side pressure of the compressor when the compressor is failed to be started due to any cause; and a magnetism-resistant section having a conductive layer sandwiched by insulating layers. The magnetism-resistant section covers a portion of a substrate of the control device, and a portion at which the conductive layer is exposed is in contact with the housing or a part conducting heat to the housing.

Abstract: A method and an apparatus are described for monitoring a rotating synchronous electric machine (9), which comprises a rotor winding and a stator having a stator winding. The method comprises the steps of determining the stator winding current, determining the stator winding voltage, determining the rotor winding current, and estimating the temperature in at least two positions in the electric machine (9) using a model of the electric machine and the determined current and voltage values. An apparatus according to the invention is provided for carrying out the method.

Abstract: A method for monitoring a fan comprises measuring power usage of the fan, determining a derivative of the measured fan power usage, tracking the derivative over time, and predicting impending fan failure based on the tracked fan power usage derivative.

Abstract: An electric rotating machine capable of lowering the temperature of a rotor disposed, wherein at least one of closed ventilation loops for cooling is formed, one of the loops constituting a ventilation passage communicating with an exhaust side through a heat source of the end of the generator to a cooler, thereby to supply cooling wind to the rotor after it passes through the cooler.