Abstract: A drive section for a dental handpiece having a housing with means for connection to a supply hose and means for connection to a grip section of the handpiece, the housing receiving a drive motor having a stator surrounding a rotor and at least one coolant line section extending therethrough in a direction parallel to the axis of the drive section, characterized by the stator consisting of a hard metallic material with at least one section of soft metallic material, each section being a portion of the circumference of the stator and extending the length thereof, and each section having a means for receiving a portion of the coolant line. Preferably, the stator has a cylindrical configuration in which the sections form a segment of the cylindrical configuration and are provided with a longitudinally extending bore which forms a portion of the coolant line.

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: A liquid cooled rectified-alternating current generator for supplying direct current to electrical loads such as the battery and other electrical loads on a motor vehicle. The generator has a generator compartment containing a stator winding and a rotor. A rectifier compartment is provided at the end of the generator which contains diode rectifiers supported by heat sinks and connected to the stator winding of the generator. A liquid coolant medium, such as engine lubricating oil, is circulated through the generator. The coolant is supplied under pressure to the rectifier compartment, thence to the generator compartment and from there coolant is exhausted into a suitable oil sump. The passage means for supplying coolant from the rectifier compartment to the generator compartment comprises a laterally extending passage having an inlet located adjacent the heat sinks for the rectifiers.

Abstract: Improved cooling is provided for the end regions of the stator cores of large dynamoelectric machines where substantial losses result from the presence of axial magnetic flux. Additional cooling is provided in the tooth portion of the end regions of the core by means of axial vents in the slots for flow of coolant gas between the winding conductors and the slot walls, thus cooling the teeth and reducing excessive heating, while the heated slot wall is spaced from the winding insulation and direct contact is prevented.

Abstract: Improved cooling is provided for the end regions of the stator core of a large dynamoelectric machine. For this purpose, a solid rigid vent plate is placed in contact with the finger plate at each end of the core. The vent plates are non-magnetic plates of the same configuration as the core laminations and have radial grooves in at least one surface. Coolant gas flows through the grooves to directly cool the finger plate and the end laminations of the stator core.

Abstract: A dynamoelectric machine utilizing stiff, multiple component phase leads for connecting potentially misaligned stator coils and parallel phase rings. The phase leads, when attached to stator coil and phase ring coolant headers, provide electrical communication therebetween. The first and second phase lead components have a hole and cylindrical portion respectively wherein the cylindrical portion is insertable in the hole. Such phase lead hole has a longitudinal axis perpendicular to both slot elongation directions. Intimate electrical contact between the phase lead components and their connected coolant headers is insured by disposidng solder between their mateable, plane surfaces. Intimate electrical contact between the phase lead components is insured by brazing the components together at the interface between the assembled cylindrical portion and hole.

Abstract: A cooling system for an axial air gap dynamoelectric machine having a discoidal rotor provides liquid cooling to the stator or rotor or both. The cooling system is arranged so that removal of a few parts will either expose the length of the liquid conducting passages or expose the end of a straight liquid conducting portion of a passage so that the cooling passages may be easily cleaned. In one form for stator cooling there are grooves in the outer wall of the stator with a cover plate over the grooves to form passages. An inlet and an outlet are provided in the cover plate. Removal of the cover plate exposes the groove for cleaning. In another form for rotor cooling the discoidal rotor has a metallic hub with pairs of straight holes extending through the hub generally parallel to the axis of rotation. A hub ring on one side of the hub has short grooves, forming with the hub, passages connecting each pair of straight holes. An end plate on the other side of the hub has two radially extending holes.

Abstract: A dynamoelectric machine end shield for closing the ends of a cylindrical shell, the end shield comprising a pattern of valleys and plateaus to create a reinforcing rib pattern that provides increased strength. The end shield, which may be formed from thin cross section sheet material, provides a close fitting rabbet that does not require machining and provides a structure that will not transmit possible distortion of the lighter gauge material from the mounting bolts to the bearing. Because of the additional strength afforded by the reinforcing rib pattern, radially inward displacement of the extended portions of extended clamp bolts also is minimized.

Abstract: A ventilation system is provided for dynamoelectric machines such as hydro generators having salient pole rotors and in which the rotor and stator have separate ventilation systems sealed from the air gap. The stator ventilation system includes radial vent ducts with longitudinal ducts in the stator core extending between adjacent radial vent ducts. The longitudinal ducts are sealed from the air gap and are disposed in the region of the stator windings, preferably extending through the teeth. Ventilating air flows radially inward through the vent ducts, longitudinally through the longitudinal ducts from one vent duct to the next, and radially outward to the external circuit where it is circulated through coolers, by means of a blower or otherwise.

Abstract: An electric generator includes a rotor, a stator, a frame, a core with radial channels, and a winding, the space between the frame and the external surface of the core being divided by radial partitions into an even number of sections communicating with one another in pairs. The first section in each pair communicates along the gas flow path with the gas coolers located in the frame in close proximity to the core faces and arranged to admit the gas flow into the radial channels of the core while the second section in each pair communicates along the gas flow path with the inlet depression zone of the fans installed on the rotor faces and is arranged to discharge the gas flow from the radial channels of the core to the fans whose pressure zone communicates along the gas flow path with the gas cooler inlet.

Abstract: Cooling system for a superconductive exciter winding in a turbogenerator rotor, the exciter winding having winding coils formed of a multiplicity of individual windings that are received in slots formed at the outer periphery of a solid support cylinder and retained therein by a bracing cylinder shrink-fitted on the support cylinder, includes coolant distribution channels disposed radially in teeth located between and defining the slot formed in the support cylinder and in filler members located between winding head coils, the coolant distribution channels surrounding the individual windings over the entire length thereof and being connected in peripheral direction on both sides thereof with coolant channels extending substantially parallel to one another in radial direction with the individual winding coils and surrounding the same at the bottom of the slots; and method of production.

Abstract: A high-power, high-speed synchronous rotary electric machine having an airgap defined therein, includes a cylindrical rotor havng a shaft, slots defined in the rotor for receiving a rotor winding, subslots defined in the rotor in communication with the slots, a plurality of cooling channels defined in the slots in connection with the rotor winding and adjacently disposed along cylindrical surfaces coaxial with the shaft, first connecting means operative to interconnect adjacent channels to be in communication with each other, a second connecting means operative to interconnect the subslot to the channel disposed closest to the shaft, an inlet port defined in the rotor in communication with the channel disposed farthest from the shaft, and an outlet port defined in the rotor in communication with the airgap and disposed in an axial direction with respect to each other.

Abstract: A rotor for use in a rotary electric machine, which rotor includes a rotary shaft, a core on the shaft, windings wound around the core and having axial end portions thereof protruded from the axial ends of the core respectively, retaining rings each fixedly mounted on the shaft and extending around the outer peripheral surface of each protruded end portion of the windings for preventing each protruded end portion from being radially outwardly moved during the rotation of the shaft, and shielding layers each positioned between the inner peripheral surface of each retaining ring and the outer peripheral surface of each protruded end portion of the windings for preventing the cooling gas from being in contact with the inner peripheral surface of each of the retaining rings.

Abstract: A reverse flow cooled dynamoelectric machine if provided with cooling gas passages extending through a fan ring and a portion of the rotor spindle to the end turns of the rotor winding in a direction substantially corresponding to the direction of flow of the cooling gas as modified by a tangential component imparted to the gas by the rotation of the fan ring. This direction is the vector sum of the longitudinal component of the velocity of the gas as it approaches the passages and the tangential component imparted by the rotation of the fan ring. The exit end of each passage is circumferentially displaced from the inlet end opposite to the direction of rotation. The centerlines of the gas passages lie in planes spaced around the axis of rotation of the rotor and parallel to this axis.

Abstract: A commutator motor constructed and arranged to provide cooling and removal of carbon dust produced during operation. The motor comprises a housing, a stator consisting of a plurality of laminations embedded in the housing and defining at least a pair of circumferentially spaced yoke portions and pole portions intermediate the yoke portions. The rotor is rotatably supported in the stator cavity. The yoke portions are of a predetermined configuration defining first axial channels having inlet and outlet openings to facilitate flow of cooling medium through the channels in one direction. A commutator chamber is provided at one axial end of the rotor and separated from the rotor cavity by a circumferentially extending wall.

Abstract: A terminal box for a dynamoelectric machine utilizes a flux shield system wherein a plurality of flux shields are interposed between the wall of the terminal box and a high voltage bushing. Cooling fluid is passed through the flux shield system to maintain all parts at a safe, low temperature. In one embodiment of the invention, a first inner flux shield member of high electrical conductivity and low magnetic permeability is spaced from but surrounding the bushing. A second outer flux shield member of low electrical conductivity and high magnetic permeability is spaced between the first shield member and the terminal box wall. Passages and openings are provided to allow cooling fluid to circulate over the respective shield members and the wall of the terminal box without providing a path for transmission of flux from the area surrounding the bushing to the terminal box wall.

Abstract: A dynamo electric machine wherein a hollow rotor shaft carries cooling oil, there being outlet means in the wall of the hollow shaft whereby the oil is discharged from the shaft onto the windings of the machine to cool the windings. The outlet includes a hollow tubular screw which extends through the rotor shaft wall and which protrudes inwardly from the inner surface of the shaft so as to receive oil from a region of the shaft interior which is spaced radially inwardly of the inner surface of the shaft. The hollow screw discharges oil at the exterior of the shaft into an annular weir member which is carried by and encircles the shaft and from which oil is thrown onto the windings of the machine to cool the windings. The hollow screw in addition to defining the oil outlet from the shaft serves at least in part, to secure the weir member to the shaft.

Abstract: A dynamoelectric machine having a stator portion with internally cooled windings disposed therein which are electrically and hydraulically connected to a system of conduits each of which conducts both electricity and coolant. The system of conduits provides electrical and coolant communication to the terminating portions of the windings and supplies coolant to intermediate end turn portions of the windings. Each conduit branches at one end into several members, one of which becomes a phase lead when electrically connected to a terminating portion of a winding while the remaining members conduct coolant in an electrically insulated manner to the winding's terminating and end turn portions.

Abstract: Variable-speed electric induction motors are known with a closed fluid-flow circuit for coolant liquid driven by a pump operated by the motor. A disadvantage is that the coolant flow varies with speed of the motor. The improvement is that the motor has an ancillary shaft which drives the coolant pump and which is rotated at constant speed irrespective of the speed of the main drive rotor of the motor. The ancillary shaft may be driven by an ancillary rotor cooperating with the main stator of the motor. There may also be provided a coolant fan driven at constant speed, for example by the ancillary shaft and preferably through a releasable clutch.

Abstract: A cooling shell arrangement is provided for assembly about an outer periphery of a housing of a dynamoelectric machine. The cooling shell arrangement comprises at least two extruded sections of arcuate shaped cooling members having cooling fins and at least two locking members fixedly holding the at least two sections in a predetermined position on the outer peripheral surface of the housing so that elongation of the at least two sections caused by thermal expansion is accommodated by the at least two locking members. Hoop tension is maintained in the at least two sections over a predetermined temperature range. The cooling shell arrangement improves the transfer of heat from the outer peripheral surface of the housing.

Abstract: A method of assembling an electric machine consists of placing a rotor within a stator having resilient inserts preassembled thereon. At least two ropes are secured to the inserts, each rope being passed through a radial ventilating duct of the stator. The ropes are secured to the top of said resilient insert immediately adjacent the rotor. Prior to assembly, each resilient insert is bent down to the core with the aid of said ropes.

Abstract: This invention provides an oil-cooled motor, the housing of the motor comprising an oil storage chamber and at least one passage communicating with the storage chamber. The storage chamber is connected with one end of the armature shaft of the motor, while the passageway meets the other end of the armature shaft. Also, the armature shaft is provided with an axial passage communicating with the storage chamber and the passageway in the housing, whereby, during operation of the motor, the cooling oil will circulate along said passage and passageway and thus maintain the motor at a reduced operating temperature level. In another embodiment according to this invention, the housing of the motor is further provided with a second storage chamber around gearing at the output end of the armature shaft, and the oil stored in the second chamber is in communication with the passageway provided in the housing and the passage in the armature shaft. With this arrangement, better cooling effect may be obtained.

Abstract: An exciter-current lead-through bolt which is passed through a radial bore in the rotor shaft of a dynamo-electric machine, especially a turbo-generator, and screwed into an exciter-current lead-in conductor bar which lies in a longitudinally extending bore within the shaft. The radially outer part of the lead-through bolt is mechanically and electrically connected with a terminal conductor bar leading to the exciter winding located on the rotor.

Abstract: A reverse flow cooled dynamoelectric machine if provided with cooling gas passages extending through a fan ring and a portion of the rotor spindle to the end turns of the rotor winding in a direction substantially corresponding to the direction of flow of the cooling gas as modified by a tangential component imparted to the gas by the rotation of the fan ring. This direction is the vector sum of the longitudinal component of the velocity of the gas as it approaches the passages and the tangential component imparted by the rotation of the fan ring. The exit end of each passage is circumferentially displaced from the inlet end opposite to the direction of rotation. The centerlines of the gas passages lie in planes spaced around the axis of rotation of the rotor and parallel to this axis.

Abstract: A reverse flow cooled dynamoelectric machine is provided with duplex gas coolers disposed in a side-by-side relationship. The coolers are baffled such that a portion of the gas flowing through both coolers is channeled to both the end portion of the rotor and to the stator and the body portion of the rotor so that both areas may be effectively cooled under reduced load operating conditions in the event of the failure of one of the coolers. In a preferred embodiment of the invention, first and second U-shaped baffles are disposed between the coolers and the inner walls of a removable dome, and a planar baffle engages adjacent free ends of the U-shaped baffles. The baffle components are dimensioned to ensure satisfactory flow of cooling gas to the body portion of the rotor. Aligned stator and rotor baffles are provided to segregate inlet zones and outlet zones in the gap between the stator and the rotor to better ensure effective cooling of the body portion of the rotor.

Abstract: A cooling device for use in a low inertia electric motor, in which there are provided a plurality of main passages for cooling air, around the outer circumferential surface of a cylindrical armature which surface is surrounded by magnetic pole pieces with gaps left therebetween. The main passages extend in the axial direction of the armature, so that cooling air is introduced under pressure from the ends of the aforesaid main passages on one side and then discharged from the other ends of the main passages, so as to cool the outer circumferential surface of the armature. At least half of those main passages are of such an arrangement that the cross sectional areas of the main passages are gradually varied from inlets of the main passages towards the outlets thereof, respectively so that a circumferential flow of air through said gaps is created.

Abstract: Insulated wire coated with a bonding material is formed into cables and wound in an appropriate chamber. A pressurizing material is utilized to compress the wires in the chamber. The pressurizing material is then hardened to maintain the wires in the compressed state. Heat is then applied to cause the bonding material to bond the wires together and rigidly maintain them in the positions they occupy when compressed.

Abstract: Liquid-cooled rotor for electric machines including shaft means formed with axial bores for feeding and withdrawing cooling liquid, and radial bores connecting the axial bores to cooling-liquid collecting chambers surrounding the shaft means, thin-walled tubes of corrosion-resistant material forming a lining for the cooling-liquid bores, the tubes being in firm rolled-in engagement with the surfaces defining the bore, along the entire lengths thereof, and diverting members fitted, into the axial bores at locations whereat the radial bores divert from the axial bores, the diverting members connecting the axial bores, respectively, with the radial bores; and method of producing the rotor.

Abstract: Cooling system for a superconductive exciter winding in a turbogenerator rotor, the exciter winding having winding coils formed of a multiplicity of individual windings that are received in slots formed at the outer periphery of a solid support cylinder and retained therein by a bracing cylinder shrink-fitted on the support cylinder, includes coolant distribution channels disposed radially in teeth located between and defining the slot formed in the support cylinder and in filler members located between winding head coils, the coolant distribution channels surrounding the individual windings over the entire length thereof and being connected in peripheral direction on both sides thereof with coolant channels extending substantially parallel to one another in radial direction with the individual winding coils and surrounding the same at the bottom of the slots; and method of production.

Abstract: A rotor member is provided for dynamoelectric machines having a laminated core with radial ventilating ducts extending through the core and passages for ventilating air extending longitudinally of the core and communicating with the radial ducts. The longitudinal air passages decrease in cross-sectional area from one end of the core to the other in a manner to produce substantially equal velocity of air flow through all of the radial ducts to insure uniformity of temperature from one end of the rotor to the other.

Abstract: An arrangement for the rotating thyristor excitation [RT excitation] in a turbogenerator which is suited for very high centrifugal force loadings in which the carrier discs of the rectifiers wheels are designed in the form of hubs mounted about the shaft secure against turning and having hollow-cylindrical projections extending axially in two directions to form with the shaft recesses into which the semiconductors including their cooling elements and their protective external components as well as the electronic driver units are disposed along the inside diameter of the cylindrical projection on the hubs.

Abstract: A fluid cooled stator winding of a dynamo-electrical machine is comprised of stator bars each composed of a combination of solid and hollow conductor strands. The end portions of the hollow conductor strands protrude beyond the ends of the solid conductor strands of the bar and are grouped together in a conductor bundle on which is cast a body of synthetic resin that forms a nipple for connection of a hose to the bundle of hollow conductor strands for circulation of the fluid coolant.

Abstract: A liquid-cooled rotor is provided for large dynamoelectric machines, such as turbine generators, in which a coolant liquid such as water is supplied through a shaft bore and radial passages to an annular distribution chamber on the surface of the rotor. Water flows from the chamber to the rotor winding, and back to the chamber, through insulating hoses which are distributed about the circumference of the chamber, and coolant tubes are connected to the insulating hoses to carry the liquid to and from the rotor winding. The tubes are brought together in groups in a transition region from which they extend into slots in the surface of the rotor. The tubes are disposed in the transition region so as to minimize the space required and are supported against rotational forces in a manner to facilitate manufacture and repair.