Abstract: A rotary electric machine that controls fluid pressure and loss of cooling air, increases the cooling air flow rate, and is able to favorably cool the end of a coil with little regard to the positional relationship between the centrifugal blades and the end of the stator coil, is disclosed. A cooling fan of such a rotary electric machine includes centrifugal blades having deflecting blades disposed therebetween, which are mounted so as to incline towards an inside of the axial direction. The centrifugal blades and the deflecting blades are integrally formed. For this reason, the cooling air accelerates at areas between the individual blades in the centrifugal direction and is separated into two flows, one in the direction of inside portions and one in the direction of outside portions of the end of a stator coil. The end of the stator coil is cooled favorably.

Abstract: An air fan capable of increasing the amount of air fed in a radial direction thereof. An impeller which includes a plurality of blades for sucking air from one side in an axial direction of a revolving shaft of a motor and guiding sucked air mainly toward the other side in the axial direction is mounted on a rotor of the motor. A casing includes a peripheral wall arranged so as to define a cavity therein in which the motor and impeller are received. The peripheral wall is provided at a portion thereof in proximity to an end thereof on the one side with a lateral suction port which permits air to be suckedly introduced therethrough into the cavity in a radial direction of the revolving shaft. Also, the peripheral wall of the casing is provided at a portion thereof in proximity to an end thereof on the other side with a lateral discharge port which permits air suckedly introduced into the cavity to be discharged therethrough in the radial direction.

Abstract: A brushless motor for use as a fan motor or the like has a housing, a bearing tower provided inside the housing, a stator fixed on a circumference of the bearing tower, a rotor having a shaft rotatably supported by a bearing inside the bearing tower, a rotor magnet provided on the rotor and opposed to the stator, and a circuit base on which a drive control circuit for controlling the rotation of the rotor by controlling a current supplied to the stator is formed. The housing is provided with a supporting plate for supporting the bearing tower. This supporting plate is recessed in an axial direction relative to a bottom surface of the housing, and supports the bearing tower so that the bearing tower projects inwardly from the supporting power in the axial direction. The circuit base is mounted on a surface of the supporting plate opposite from the bearing tower. If this structure is adopted, the overall size of the motor can be reduced while the desired mounting area of the circuit base is maintained.

Abstract: In gas-cooled electrical machine with an axial fan (9) at one shaft end and with a rotor (1) and a stator body surrounded by a machine housing (14), a gas-guide device (18) arranged coaxially to the rotor shaft is provided in the outflow space (17) of the axial fan (9), out of which gas-guide device the cooling gas conveyed by the axial fan is fed to the rotor and to the stator body and stator winding. Said gas-guide device (18) comprises a plurality of guide rings (19-25) in the form of a cone envelope and spaced radially from one another and a ring part (27) likewise in the form of a cone envelope, which rings and ring part are connected to one another and to the machine housing (14) directly, or indirectly by means of bars (28, 29) extending essentially radially and/or guide plates (36, 36'). Ring-shaped channels (K.sub.1, . . . , K.sub.

Abstract: A router includes a motor housing having first and second clam shell halves forming an air inlet and a stator forming an air outlet, the housing having a central axis therethrough. An electric motor having a rotary armature, an armature shaft and a stationary member is fixed with respect to the housing. An axial fan is fixed to the armature shaft and positioned between the rotary armature and the stator for drawing air across the armature and stationary member. The fan has a plurality of radially extending fan blades tilted with respect to the central axis for forcing air in a substantially helical path. The stator includes a plurality of radially extending stator blades oppositely tilted with respect to the fan blades and the central axis for receiving air moving in a helical path from the fan blades. The stator blades are configured to cause air to swirl in a predictable manner when leaving the housing.

Abstract: An axial flux induction motor has a stator and a disc-shaped rotor facing the stator with an air gap there-between. The rotor disc includes a first material of relatively high magnetic permeability and a second material of relatively high electrical conductivity, the first material being of higher specific gravity than the second material. The first material is in the form of an annular ring imbedded in or supported on one surface of the disc, opposite the surface thereof which faces the stator. The outer radius R.sub.1 of the annular ring and the outer radius R.sub.2 of the disc are related so that 1.2 R.sub.1 <R.sub.2 <1.6 R.sub.1. This achieves that at high rotational speeds the two disc materials will be subjected to more nearly equal centrifugal forces thereby making it feasible to operate at higher motor speeds.

Abstract: A laminated rotor assembly is provided having a plurality of laminates, each of which has integral rotor blades. The rotor blades are angled at a predetermined amount with respect to a hub portion of the rotor assembly. The laminates are joined such that the laminated rotor assembly is closed.

Abstract: A dynamoelectric machine in the preferred form of a permanent magnet motor has an integral blade assembly associated with the rotor for the motor. The motor includes an enclosure with which the blade assembly mates. The blade structure/housing combination provides a labyrinth moving seal to protect the motor and associated motor control. The blade assembly and enclosure preferably are constructed from nonconductive material and provide a fully electrically insulated motor-fan assembly, which eliminates the need for certain grounding requirements. Blade construction is optimized easily to reduce audible sound in operation use. A method of assembly for a motor provides an integral blade assembly housing arrangement.

Abstract: A baffle and lead guide is provided for an electric motor with a reverse air flow cooling system for the motor. The motor includes a shell housing a stator assembly and a rotor assembly, the rotor assembly including an axially extending shaft. A first end shield closes one end of the shell and a second end shield closes the second end. The shaft is rotatably journaled in at least one of the first and second end shields and extends through at least one of the first and second end shields. A fan is fixed to the shaft between the rotor and the second end shield to rotate with said shaft. Leads extend to the second end shield through the motor shell from the stator assembly. The baffle is positioned axially adjacent the fan. Preferably, the baffle is annular in shape and includes at least one axially extending leg which defines a lead chute radially outboard of the fan to guide the lead wires past the fan.

Abstract: A rotary electric machine that controls fluid pressure and loss of cooling air, increases the cooling air flow rate, and is able to favorably cool the end of a coil with little regard to the positional relationship between the centrifugal blades and the end of the stator coil, is disclosed. A cooling fan of such a rotary electric machine includes centrifugal blades having deflecting blades disposed therebetween, which are mounted so as to incline towards an inside of the axial direction. The centrifugal blades and the deflecting blades are integrally formed. For this reason, the cooling air accelerates at areas between the individual blades in the centrifugal direction and is separated into two flows, one in the direction of inside portions and one in the direction of outside portions of the end of a stator coil. The end of the stator coil is cooled favorably.

Abstract: An air-cooled motor having cooling-air passages each formed by a plurality of small ventilation passages extending through a front housing, a stator, and a rear housing, constructed in one piece. Cuttings are prevented from being accumulated at inlets of cooling-air passages. For example, the cooling-air passages are formed of ten small ventilation passages, each defined between adjacent ones of eleven ribs each forming part of the stator. All the eleven ribs are provided with respective front housing ribs. End faces of the front housing ribs on the cooling-air inlet side are uniform in height, and positioned in an identical plane. Cooling air flows into the small ventilation passages in the direction of an arrow.

Abstract: A direct current fan has a base, a stator assembly fixed to the base, a spindle extending from said the stator assembly, and a blade assembly rotatably mounted to the spindle. The stator assembly includes a central axle and a bobbin having electrically conductive winding formed over the central axle. Pole plates alternately extend from diametrically opposed upper and lower disks which are mounted to the respective upper and lower ends of the central axle. Each said pole plate has first and second circumferential sections located at different distances from the central axis. The blade assembly includes a cylindrical member having blades mounted thereto and a circular central recessed portion. A hub is formed in the center of the recessed portion for receiving a portion of the spindle. The hub has an aperture in its center and a plurality of tabs equally spaced around the aperture.

Abstract: An electric fan includes a housing having a hub formed in the center, a shaft has one end force-fitted in the hub and having an annular flange formed in the other end, two polar plate are force-fitted on the shaft, and a stator is disposed between the polar plates. The upper polar plate and the lower polar plate each includes a hole for engaging with the shaft and the holes have one or more teeth for solidly engaging with the shaft.

Abstract: A heat dissipator for an electric motor includes an impeller having an internal heat transfer mechanism. The heat transfer mechanism provides efficient heat transfer from the motor armature to the surrounding environment without forcing cooling fluids into the motor and without transferring heat through the motor housing. The motor can therefore be encased in sealed, light-weight plastic motor housing having relatively poor heat transfer characteristics without danger of overheating. The impeller is preferably designed to displace fluids without turbulence, thereby reducing noise and increasing efficiency. To this end, the impeller employs annular disks stacked on a shaft which may be rotatably mounted in a specially shaped housing and which preferably is formed from an extension of the motor drive shaft. The disks and a complementary surface cooperate so as to use a combination of surface friction, centrifugal forces, and a venturi effect to propel fluids without turbulence.

Abstract: An electronically commutated motor for dust exhausters with a stator with excitation windings and with a rotor positioned to rotate in an air gap. The rotor has bundled laminations and permanent magnets around its circumference corresponding to the number of poles of the stator. A fan rotor of a ventilator is also provided on the rotor shaft, with the fan rotor connected downstream from the motor in the intake direction of the cooling air. The rotor shaft is connected with a turbine for generation of an intake air current, wherein the fan rotor is positioned in the upper bearing plate of the turbine. The bearing plate is designed in one piece in immediate vicinity of the turbine rotor and has indentations and cutouts in a radially outward direction, whereby air currents of the fan rotor and the turbine rotor flow each from its respective side, with the exit slots for cooling air from the fan rotor and the outlets for the exhaust from the turbine going out from the bearing plate.

Abstract: A rotating machine having a rotor comprising a flexible shaft with a plurality of masses distributed along the shaft. Included within these masses are magnetic disks. Magnetic bearings are attached to the housing and coact to support the rotor in only a radial direction or in both radial and axial directions. Bearing sensors are used to measure the shaft position local to each bearing relative to a face of each bearing. Variable magnetic bearing parameters are controlled so as to change values of stiffness and damping of the magnetic bearings in response to the measurements from the bearing sensors. These controls can be direct analog circuitry, or digital components, or a combination of digital and analog components.

Abstract: This invention relates to a bread baking device, and is intended to attain the objective of providing a bread baking device having no exclusive cooling fan as an extra special part, and enabling low-cost production, by integrally shaping a cooling fan in one piece with a driving pulley mounted on the driving shaft of a driving motor, and by efficiently cooling the generated heat in said driving motor and the frictional heat generated in a belt by circulating air flow in accordance with the revolution of said driving motor.

Abstract: An object of the invention is to, in a vehicular alternating current (AC) dynamo, reduce an influence of vibration on a brush during operation, thereby preventing the brush from wobbling, cracking or causing other damages, also to make the brush sufficiently exposed to cooling air during operation, thereby preventing the brush temperature from rising excessively. In the vehicular AC dynamo, by virtue of a pressing force produced upon a tubular cover integral with a fan guide being fixed to a rear bracket through a seal member, an abutting end surface of a projection of the tubular cover is axially abutted with an inner abutting surface of a recess of the brush holder for pressing and fixing said brush holder against and to the rear bracket.

Abstract: A one-piece, plastic, integrally formed deflector for a motor includes a generally annularly shaped shroud portion, an axially offset generally annularly shaped mounting ring portion, and four generally axially extending webs interconnecting them. The deflector may be conveniently mounted to an end bracket with a screw placed through a mounting hole in the mounting ring located at each web such that as the end bracket is assembled to the motor, the shroud portion closely fits nearly adjacent the rotating rotor blades and the inside of the motor shell to restrict the flow of ventilating air through the motor and prevent its re-circulation past the blades.

Abstract: A micro electrostatic cooling fan arrangement is provided which includes a heat source having a planar surface, a stator attached to the heat source, an axle attached to the heat source and spaced from the stator, a rotary element including a hub having an aperture therein and a fan blade, the axle passing through the aperture of the hub and the fan blade having a major surface thereof disposed at an angle with respect to the surface of the heat source and attached to the hub at one end, with the other end of the fan blade being adjacent to but spaced from the stator and a voltage source applied to the stator having sufficient voltage to charge the fan blade.

Abstract: An air guide and motor housing assembly for use in domestic and commercial vacuum cleaners is described wherein the assembly comprises an air guide having a center detail for engaging the motor housing to facilitate assembly of the components, and reduce creep, turbulence and vibration-induced noise. An air guide for use with a centrifugal fan is described wherein the air guide is mounted on a motor bracket using the same rivets that fasten a bearing assembly to the motor bracket. Alternative embodiments of the device are also described in which a step in an inner fan housing cooperates with a step projecting from the air guide to securely fasten the air guide to the motor assembly, and a center detail on the air guide engages the motor housing to secure the air guide thereto, thereby providing the same advantages.

Abstract: The invention relates to a fan unit for generating gas streams, in particular for vacuum cleaners, which unit comprises a motor (4) and an impeller wheel (1) which is also electromagnetically active and in conjunction with electromagnetically active parts (19) of the motor stator (3) generates the torque of the impeller wheel via an air gap (11) formed between radial surfaces of the impeller wheel and the motor stator, the electromagnetically active part of the impeller wheel (1) being a conductive disc (7) which is arranged in a radial plane and which has one radial surface (8) bounding the air gap (11) at the rotor side, and the air gap being bounded at the stator side by planar stator poles (19) formed on a radial bounding surface (12) of an iron cylinder (15) by the provision of radial slots (17) in which the coils (20) are arranged.

Abstract: A rotor for an alternating current generator of a type that has two pole segments provided with interleaved pole teeth and a core disposed between the segments that carries a field coil. The shaft of the rotor carries a slip ring assembly having two metallic slip rings. A ball bearing is disposed between one of the pole segments and the slip ring assembly. A portion of the shaft that is located inside of the inner race of the ball bearing has a pair of slots and wires for connecting the field coil to the slip rings are located in the slots and inside the inner race of the bearing. The electrical connections between the ends of the field coil and the slip rings includes wires that are twisted together to form twisted wire portions. The twisted wire portions are locked or fixed to a fan that is formed of thermoplastic material by material of the fan that completely encircles portions of the twisted wire portions.

Abstract: A vehicular AC generator comprising a stator supported by a front bracket and a rear bracket; a rotor fixed to a rotating shaft supported by the front bracket and the rear bracket through bearings, provided with magnetic pole cores wherein a plurality of pairs of magnetic poles are formed in the circumferential direction, retaining an excitation coil; a pair of fans provided at a front end and a rear end of the magnetic pole cores; a plurality of inlet openings provided at end faces of the front bracket and the rear bracket; a plurality of outlet openings provided at peripheral portions of the front bracket and the rear bracket; and fans for cooling inside of the vehicular AC generator by circulating air therein by rotation of the rotor; wherein the fans each is fixed with a side plate at ends of blades thereof and at least in a front side fan of the both fans, a difference between an inner radius of the side plate and an inner radius of the inlet opening of the corresponding front bracket is larger than a wi

Abstract: An axial blower has a blower motor and a blower wheel. The blower motor includes a motor shaft; a motor housing; a front and a rear bearing cover attached to the motor housing; ventilating openings provided in the front bearing cover; and air outlet openings provided in the rear bearing cover. The blower wheel includes a hollow hub surrounding the rear side of the motor housing; a plurality of impellers affixed to the exterior of the hub and projecting therefrom; a plurality of vane-like ribs carried by the hub at the interior thereof for generating a cooling air stream flowing between the hub and the motor housing; a bell-shaped part forming an axial continuation of the hub and surrounding the front side of the motor housing, a bottom portion, a central opening in the bottom portion and a plurality of ventilating openings provided in the bottom portion. The ventilating openings are arranged in a circular array concentrically with the central opening.

Abstract: A vehicular AC generator comprises a stator connected to a front bracket and a rear bracket, a rotor fixedly mounted on a rotational shaft rotatably supported by both the brackets, and a front fan and a rear fan each serving for cooling the generator. A plurality of air intake holes are formed around the inner circumstance of each bracket, while a plurality of air outlet holes are formed around the outer circumstance of the same. As the rotor is rotated, cooling air is introduced into the generator through the air intake holes and then exhausted to the outside through the air outlet holes while cooling the interior of the generator. The number of blades on each fan is set to a certain odd numeral, and moreover, the number of blades on the front fan is different from that of the rear fan. The number of blades on each fan may be set to an odd numeral which is not a multiple of numeral of three.

Abstract: A revolving field electric motor including an armature attached to a shaft which armature is driven to rotate about the shaft, thus causing the shaft to turn. Permanent magnets are disposed on opposite ends of the armature. In place of field magnets of conventional motors which are energized all the time, individual electromagnets are evenly spaced around the perimeter of the circle inscribed by the armature. Opposing magnets are switched on only when the armature magnets approach, and are switched off as the armature magnet is attracted to and passes by the energized magnet.

Abstract: A rotating electric machine includes a housing having a first inlet at one end for admitting ventilation air for cooling the machine, and a second inlet at the other end which also admits cooling air into the machine. A fan located at one end of the housing draws air into the housing through the first and second inlets, and forces it out of the housing through a single outlet located near one end of the housing. Air entering the second inlet passes through openings in the fan carrier, cooling isolated areas of the rotor, and flowing through the fan blades with the air which enters through the first inlet.

Abstract: In the case of a universal electric motor for any kind of drive, with a stator package, a rotatably mounted rotor with commutator, as well as end shields on both sides that also constitute the bearings for the rotor and a switching ring that can be rotated through predetermined angular amounts and carries the (carbon) brushes, it is proposed to insert into the end shield A a closely fitting anchor block that serves for locking together the two end shields with the intervening stator package; further, the switching ring can be mounted on an external annular end face of the end shield B that also carries the switching strips or switching rails needed for switching between clockwise and counter clockwise rotation, complete with contact areas situated in the plane of the annular end face and suitable for axial contacting, the said contact areas making contact with other axial contact areas on the switching ring to establish connections with the carbon brushes.

Abstract: A vehicular a.c. generator comprising a stator coupled to a pair of brackets on either side, a rotor secured to a rotary shaft supported with both brackets via respective bearings, and a pair of fans fitted to the core portions on either side of the rotor, wherein each bracket has a plurality of suction ports at one end and a plurality of exhaust ports in the outer peripheral portion thereof, wherein the inner edge face of one bracket axially faces vanes of the fan with a small clearance therebetween and wherein the generator is ventilated and cooled by the fans as the rotor rotates, is characterized in that a gently-sloping annular depression is provided in the inner edge face of the one bracket facing the vanes of the fan, the depression being made in a clearance that axially grows larger from the axial center of the suction part toward both the external radial positions thereof.

Abstract: A cooling fan positioned within the casing of an electric motor comprising a plurality of closely spaced frusto-conical disks carried by the motor shaft which draw intake air past the motor rotor and stator when they are rotated. Bodies of air between the rotating disks are then thrown radially outward by centrifugal force and directed to exhaust vents formed in the casing.

Abstract: A tandem type alternator comprises a rotor rotatably supported inside a housing and having rotor cores having magnetic poles formed on outer peripheral portions of the rotor cores, respectively, and a plurality of stators arranged on an inside wall of the housing and in tandem in the direction of the axis of rotation of the rotor and having tooth-shaped stator cores which are positioned to be opposite to the magnetic poles of the rotor cores and on which multi-phase windings are wound, respectively. The stators have respectively the multi-phase windings wound thereon so that both multi-phase windings are shifted from each other in the direction of the axis of rotation of the rotor. The housing has ventilation window portions formed between and near the plurality of stators which provide communication between the interior and exterior of the housing, so that ventilation resistance within the housing is reduced and the cooling effect is increased.

Abstract: The present invention provides an improved rotor and end connector for an induction motor. The end connector adjoins a rotor core. The rotor core includes a plurality of spaced ventilation openings and defines an aperture for capturing a motor shaft. The end connector should preferably surround and be concentric with the inner ventilation openings. To increase ventilation efficiency, the end connector has a plurality of spaced fan blades. Each of the fan blades has a sloping inner surface and backward curving outer surface. The backward curving outer surface is substantially perpendicular to the end connector, and directs air flow radially outward.

Abstract: A variable pressure and variable flow rate pump in accordance with the invention includes a stationary pump housing (1), a rotating pump housing (10), rotatably mounted with respect to the stationary pump housing including a fluid receiving chamber (12) for receiving fluid to be pumped which is driven by a drive (11); a pitot probe (5) rotatably mounted in the stationary pump housing having a tip (5a) disposed in the fluid receiving chamber radially offset from an axis of rotation of the probe for receiving fluid from the fluid receiving chamber; a brake (15) for selectively braking a rotational speed of the probe to control the rotational speed of the probe independently of a rotational speed of the rotating pump housing to provide a fluid output from the output with a variable pressure and flow rate; a thermal insulator (44) mounted between the brake and the fluid receiving chamber for thermally insulating the fluid receiving chamber from heat generated by the brake; and a control (C) coupled to the brake f

Abstract: In an AC generator having a plurality of claw-shaped magnetic pole portions in a rotor, a pair of projected portions which extend toward an outer circumference from both ends of boss portions on an outer circumference of a shaft are provided, and permanent magnets are also provided so as to abut against the projected portions so that magnetic flux is applied in the same direction as the magnetic flux applied to the projected portions when an electric current is applied to a field winding which is wound around the boss portions. With a magnetic path thus constructed, it is possible that the magnetic flux if permanent magnets is put on the magnetic flux produced by a field winding, thus applying much magnetic flux to the stator. As a result, the output per weight can be increased.

Abstract: An electrical motor with integral silencer is provided having a motor housing defining an inlet aperture at one end and an expansion chamber at the other end. The expansion chamber has a reduced cross-sectional area at the entrance and exit of the expansion chamber compared to the cross-sectional area of the chamber. The exit of the expansion chamber provides an outlet aperture in the housing. A stator is situated in the housing and a rotor is rotatably mounted within the stator. A fan is secured to the rotor and rotates therewith for pulling air in the outlet aperture through the stator and exhausting the air through the expansion chamber to the housing exterior. The expansion chamber provides an impedance mismatch for the acoustic energy generated by the fan preventing a portion of the acoustic energy from exiting the expansion chamber.

Abstract: Electric motor cooling difficulties in a ducted axial flow electric fan construction are avoided through the use of a duct-like housing (10) having an interior wall (30) with axially spaced feet (34), (40) within the housing (10) and radially inward of the interior wall (30). A motor stator (88) is located within the housing (10) and is engaged by the feet (34) and (40) to be mounted in spaced relation to the interior wall (30) with its exterior surface (98) between the feet (34), (40) and facing and exposed to the interior wall (30). A rotor (84) is journalled within the stator (88) and mounts an impeller (52) which drives ambient gas through the housing (10) in contact with the exterior surface (98) of the stator to cool the same.

Abstract: A cooling fan for use inside a circuit system, especially a pulse-width modulation speed controllable DC cooling fan which can automatically vary its speed according to the internal temperature of the circuit system. An object of the invention is to control the rotation speed of the fan by a pulse-width modulation fan speed control circuit composed of a plurality of resistors, capacitors, diodes, Zener diodes, ICs and a thermistor, which is installed inside a circuit system in combination with a DC brushless fan. The control circuit in turn outputs control signal pulse following a monostable IC of said circuit continuously triggered by a phase changing cycle timing pulse signal transmitted of the fan motor. The pulse width of the control signal pulse is determined by a resistor element within a set of monostable pulse width timing resistor-capacitor (RC).

Abstract: A vehicle's AC generator is provided with a rotor magnetic pole core assembly fixedly mounted on a rotary shaft and excited through an exciting coil, stator-coil-mounted stator cores surrounding the magnetic pole core assembly, first and second brackets supporting the stator cores and rotatably supporting the rotary shaft through bearings, a pair of fans provided on both ends of the rotor magnetic pole core assembly, to allow cooling air to flow in the space defined by the first and second brackets, a rectifier, and a voltage regulator. In addition, a cooling solution circulating structure, made of a material high in thermal conductivity, is provided on the side of one of the first and second brackets. The cooling solution circulating structure, which has an upper frame and a lower frame, has a flow path inside to which a cooling solution is supplied from outside.

Abstract: An alternating current generator with a pulley (17) for transmitting driving force from an engine to a rotor and/or to an auxiliary machine, having an external axial fan (18), rotating unitedly with the pulley (17), for drawing external air into the inside of the AC generator through air intake holes provided on both covers of the AC generator housing. The pulley (17) has air-intake vents (17a) axially extending through the pulley to permit relatively cold air to pass therethrough. At each such vent (17a), a guide member (17b) between the blades of the external axial fan (18) and the air intake holes directs the relatively cold air drawn in by the axial fan, to cool the interior components of the AC generator. The guide members (17b) further serve to shut out the outside air that has been heated from having passed near the outer surface of the housing.

Abstract: A drive for workpiece spindle of a machine tool comprises a drive motor to be arranged on the free end of a workpiece spindle, a motor housing, a rotor to be mounted on the workpiece spindle and a stator arranged in the motor housing. The motor housing is connectable with a spindle box and has a motor cover. Cooling medium passages extend between the motor housing and the motor cover, between the rotor and the workpiece spindle and between the spindle box and the rotor.

Abstract: A ventilation cooling system for a dynamoelectric machine is disclosed, which provides improved cooling efficiency and reduction in windage loss. A first stream of cooling gas is directed into the spider of the machine and transversely through ventilation ducts in the rotor, across the gap, then through corresponding ducts in the stator. A further stream of cooling gas is drawn in between the spider and a shroud which extends inwardly transversely from the stator. This further stream is directed downwardly between the poles of the rotor and then transversely through the gap and stator in conjunction with the first stream.

Abstract: In order to improve a machine tool with a motor spindle, including a main motor integrated into a work spindle coaxially with the spindle axis, the main motor, for its part, comprising a rotor and a stator, and with a cooling device for supplying cooling surfaces of the main motor with a gaseous coolant, so that simple and effective cooling of the main motors of the motor spindles is possible, it is proposed that the stator be comprised of stator plates which, for their part, form cooling surfaces, and that the gaseous coolant be conducted directly along the cooling surfaces of the stator plates.

Abstract: A motor assembly including a unitary member which functions as a combined armature shaft bearing support and brush tube holder. The member is a molded plastic piece which has two legs extending from a bearing support portion and straddling the commutator and armature shaft of the motor for attachment to the motor field assembly. Ledges are formed in the legs to hold the brush tubes, which have lanced projections cooperating with notches formed in the legs for precisely locating the brush tubes and preventing longitudinal movement thereof. To clamp the brush tubes to the ledges, shoulders are provided adjacent the ledges and tabs straddling the brush tubes and the shoulders are secured by screws which pass through the tabs and into the shoulders. In order to accommodate different size brush tubes, different height shoulders are provided on opposite sides of the ledges. In addition, the legs are open at both ends of the ledges to accommodate different lengths of brush tubes.

Abstract: A miniature motor comprising a stator having a permanent magnet field fitted to the inside of a motor case, a rotor having a rotor winding and rotatably supported in such a manner as to face the stator, a commutator provided at an end of the rotor, and a cooling fan, in which a plurality of lugs are provided in a projected state on an end face of a core constituting a rotor end portion, a plurality of holes corresponding to the lugs are provided on the cooling fan having a plurality of vanes, and the cooling fan is fixedly fitted to the core and then secured in place by plastic deforming of the lugs.

Abstract: An improved reluctance motor with reduced windage losses and reduced internal rotor stresses is proposed. The reluctance motor is constructed with continuous, non-magnetic supported members in the interpolar spaces of the salient pole rotor. End plates may be added to the rotor which are attached to the support members creating a "cage" structure which supports the rotor. In addition, the rotor through shaft may be eliminated by providing stub shafts on the cage end plates to transmit torque from the rotor. Various methods of constructing the rotor of the invention are also described.

Abstract: An electrical stepper motor system is provided in which a microcomputer controlled driver monitors the real time operating parameters of the stepper motor. The driver is controlled by the microcomputer to keep the real time operating parameters of the motor in a range that is governed by limiting parameters. The limiting parameters are determined by the microcomputer on a moment by moment basis in response to changes in certain conditions occurring within the stepper motor, as well as in the outside operating environment. The microcomputer compares the microcomputer determined safe operating parameters with any user stipulated operating parameters, stored in the storage means of the microcomputer, to determine limiting parameters on a moment by moment basis. An encoder senses the position and velocity of the motor and provides appropriate status signals to enable the driver to compensate for position and velocity errors of the stepper motor.

Abstract: A vehicular AC generator comprising a magnetic pole core secured to a shaft and excited by an excitation coil, the magnetic pole core having opposite end faces, a stationary core surrounding the magnetic pole core and having mounted thereon a stationary coil, and a front and a rear bracket supporting the stationary core and rotatably supporting the shaft through bearings. The front and rear brackets having ventilation openings defined therein, and a fan mounted to each of the opposite end faces of the magnetic pole core is provided for generating flows of cooling air through the ventilation openings in the front and rear brackets, An inlet opening side end portion of a blade of the fan that overlaps the inlet opening has a radially length dimension which is equal to or less than 50% of radial legnth dimension of the inlet opening side end portion.

Abstract: A centrifugal fan for ventilated rotating machinery is provided having tapered fan blades to reduce sound pressure levels generated by fan operation over a wide speed range. The tapering of the fan blades keeps the cross-sectional area of each flow channel substantially constant as the air flows radially through the fan, resulting in a less turbulent flow. Each fan blade may include a height profile having a tapered segment in which blade height decreases in proportion to increasing radial distance from the central axis of the fan.

Abstract: The invention relates to a brushless direct current motor system that includes an outer rotor receiving a load member such as a fan wheel having a plurality of blades. An axial extension of the rotor functions as a drive boss whose diameter is independent of the diameter of the motor stator core and is step-wise smaller in diameter at its outer closed end than at its inner opened end.