Abstract: A control circuit board is received in a circuit board receiving case without being directly joined to the circuit board receiving case and has a circuit board side connector. The circuit board side connector is installed to a main body side connector of a gear housing in an installation direction parallel to a rotatable shaft of the motor main body to supply electric power to the motor main body through the main body side connector. A pin main body of a fixing pin is received into a fixing through hole of the control circuit board through a pin receiving through hole of the gear housing in a direction perpendicular to the installation direction of the circuit board side connector.

Abstract: A dual-directionally operated dynamo set includes a housing, an actuating mechanism slidably mounted in the housing in a reciprocal manner, a dual-motion structure mounted in the housing and driven by the actuating mechanism, and a dynamo device mounted in the housing and driven by the dual-motion structure. Thus, the generator of the dynamo device may be operated successively to generate the electric power along dual directions in a reciprocal manner without stopping, thereby enhancing the generation efficiency of the electric power.

Abstract: The invention pertains to a motor housing (1) as well as a pole cover (2), especially for window lift or sunroof motors, having at least one pole cover (2) and a housing (3) closing off the pole cover, which are fastened together using fasteners (4), whereby the pole cover (2) has multiple receptacles (5) for the fasteners (4), and the housing (3) closing off the pole cover has multiple counterreceptacles (6) for the fasteners (4) and for differing housings (3) which close off the pole cover differing receptacles (5) on the pole cover (2) cooperate with the counterreceptacles (6) by fasteners (4).

Abstract: A method and apparatus for dissipating heat from electric motors. Small electric motors often operate at undesirably high temperatures and are often mounted to gear cases. To reduce the temperature a thermally conductive gap filling material is compressed between the winding heads of the stator and the mating surface of motor and gear case. The gear case functions as a heat sink for the stator windings. Additional heat sinks may be mounted on the motor housing using additional thermally conductive gap filling material compressed between the other winding heads and the cover.

Abstract: A 3-in-1 motor power system comprises a motor body, a drive control mechanism, and a power transmission mechanism. A drive control circuit box is installed at an end face of the motor body, and a gear housing wherein a deceleration gear module is disposed is installed at the other end face thereof. A circuit board is disposed at an end face of the motor' stator. Stator's signals are transmitted via signal conducting needles to a drive control circuit in the circuit box. A rotor's lower bearing seat is disposed at the other end face of the motor's stator. A solar gear is disposed at the tail end of the rotor's axle, and engages planetary gears of the deceleration gear module. A deceleration gear seat is separately installed at the outer end face of the rotor's lower bearing seat. The deceleration gear module is received in the deceleration gear seat.

Abstract: An electrical generating system including an electric motor coupled to a power source, such as a solar panel array. A magnetic coupling is connected to an output shaft of the motor. The magnetic coupling includes opposed first and second plates each having permanent magnets affixed thereto and arranged such that rotation of the first plate by the motor causes the second plate to rotate by repulsive magnetic force. A gear assembly having a high transmission ratio is connected to the magnetic coupling. Preferably, at least one electrical generator is connected to the gear assembly for generating electricity.

Abstract: The present invention is a motor which has a motor casing (5) and a reduction gearing casing (7) integrally formed, a hole (8) formed on a portion shared by these casings, through which an output shaft (3a) of a rotor (3) extends from the motor casing side to the reduction gearing casing side, and a lubrication oil (9) filling the reduction gearing casing. And, a method for producing a motor comprises the step of charging a resin (11) into and curing it in the motor casing to adhere the resin to a coil of an armature and the inner surface of the motor casing. Besides, the motor casing (5) has a first casing member (510), a second casing member (520) and a third casing member (530) for covering a control section (4), and the first casing member is assembled with the second casing member, and the first casing member is assembled with the third casing member.

Abstract: A device for detecting the rotating speed of a fan motor includes a motor and a gear case fixed on the front side of the motor. Plural gears engaging with one another are provided in the gear case and one of them is embedded with a permanent magnet and further a magnetic inductive element is also installed inside the gear case to cooperate with the permanent magnet for operating together to detect the rotating speed of the motor.

Abstract: A control device for rotating a tube supporting a roller member to be wound onto or unwound from the tube has at least one electric motor housed in the tube and drive mechanism for transmitting the motion from the motor to the supporting tube. The motor is an electric three phase motor having at least four poles. The drive mechanism preferably has a single-stage mechanical reduction gear such as a planocentric reduction gear.

Abstract: An electric rotating machine has a rotor, a stator and a casing. A planetary roller mechanism constituted by a sun roller, a planet roller, a ring roller and a carrier is provided within the rotor so as to transmit the driving force of the rotor to the outside from a power shaft. Oil is sealed within the rotor or the casing. The planetary roller mechanism may be provided within the casing or at the outside of the rotor and, in this case, oil is sealed within the casing.

Abstract: A motor device including a pair of motor units and a driven member meshed with rotary gears of the pair of motor units to drive the driven member, the motor units each including a rotary magnet that is cylindrical and magnetized so as to have different magnetic poles in turn along the circumferential direction, a rotary gear having a plurality of teeth, the rotary gear rotating about the rotation axis of the rotary magnet together with the rotary magnet, and a stator member having a plurality of outer magnetic poles that are arranged on the outer periphery of the rotary magnet and a plurality of inner magnetic poles that are arranged on the inner periphery of the rotary magnet and are opposed to the outer magnetic poles, the plural outer magnetic poles and the plural inner magnetic poles being excited by a coil.

Abstract: A palm top manual operated generator includes a housing, a power generating unit, a driving set, a handle and a spring. The housing has a cambered rack which penetrates into the housing and is engaged with the first speed change gear of the driving set. After changing speed by a plurality of speed change gears of the driving set, power is unidirectionally transferred to a gear of the power generating unit through a unidirectional speed change gear. A plurality of magnets are circularly arranged within the rotary casing. When the handle is held and pressed continuously, the cambered rack drives the driving set. Then rotary speed is increased to drive the rotary casing of the power generating unit to rotate with a high speed. Thereby, electric power is generated due to magnetic excitation; the electric power is outputted from a receptacle through a regulating circuit and a power storage circuit.

Abstract: An electric motor-and-gear assembly for driving vehicle aggregates such as windshield and rear window wipers, power-window units and the like, having a transmission housing that can be closed by a housing cover. A motor housing that contains a commutator motor whose commutator protrudes into the transmission housing and cooperates with a brush holder fixed in the transmission housing. For the sake of a more reasonably priced manufacture and a time-saving, more rapid assembly of the brush holder, the commutator brushes are embodied as hammer brushes with spring leaf actuators prestressed toward the commutator. The spring leaf actuator are respectively fixed with their one actuator end in a U-shaped plastic carrying part of the brush holder, which is inserted into the transmission housing radial to the commutator, through the housing opening and is positioned in the transmission housing in a positively engaging manner by means of the housing cover.

Abstract: An image pickup apparatus comprise a camera unit for photographing a subject and a driving device for driving the camera unit in a circumferential angle direction and an elevation angle direction, wherein the driving device includes a motor which drives the camera unit in the circumferential angle direction, and a motor which drives the camera unit in the elevation angle direction, and each of the motor and the motor is constituted of a permanent magnet motor including a planetary reduction gear.

Abstract: In a transmission mechanism having a disk shaped output plate having a flat surface and an output shaft, the output plate is provided in a center thereof with a linking portion formed by drawing to axially extend from the flat surface. The linking portion has a shaft receiving hole with a plurality of engaging surfaces extending axially for receiving circumferential rotational driving force. The output shaft is provided at an axial end thereof with a shaft inserting portion fitted to the shaft receiving hole so that the output shaft is connected to the output plate so as to rotate together therewith in a state that an axial length of the shaft inserting portion in contact with each of the engaging surfaces is longer than the thickness of the flat surface.

Abstract: A drum-type motor combines planet gear and spindle motor. The planet gear is arranged on lateral side of the spindle motor and the axis of the spindle motor is functioned as sun gear. The drum-type motor of the present invention has an inner gear engaged with the planet gear. The inner gear and the sun gear have such tooth ratio that the drum-type motor of the present invention has high torque at low rotation speed.

Abstract: A motor is incorporated in a cylindrical body which is a rotary brush. Rotation of a rotor of the motor, directly or via a speed reduction mechanism, drives the rotary brush. Cooling air runs through the cylindrical body so that the motor is cooled and protected. The rotary brush and an electric apparatus using the rotary brush can be downsized and easily.

Abstract: A motor actuation device is constructed of a motor a reduction gear train and a detection mechanism. The reduction gear train includes a worm gear and a worm wheel. The worm gear is fixed to a rotary shaft of the motor and meshes with the worm wheel. The worm wheel transmits the rotation of the motor to the lens barrel to slide it along an optical axis. The detection mechanism includes a first spur gear, an idle gear, a second spur gear, an impeller and a photo interrupter. The first spur gear is molded with the worm gear integrally. The idle gear meshes with the first spur gear and the second spur gear. When the motor causes the rotation, a blade of the impeller passes in the photo interrupter and a pulse is generated from the photo interrupter.

Abstract: An automotive AC dynamo-electric machine is capable of providing a sufficient rotational output for starting an engine by running a rotor at high speed in a motor operation mode for starting the engine, thus obviating the need for increasing a size thereof. In the motor operation mode, an electromagnetic clutch follower connects to an electromagnetic clutch main body and also engages a cylindrical member to brake the cylindrical member. An internal gear portion provides a fixed element, and torque of a rotor is transmitted to a power transmission device via a rotor shaft, a sun gear, a planetary gear, and a carrier.

Abstract: An electric drive unit for windshield washers of a motor vehicle, including a drive motor having an armature accommodated in a substantially cup-shaped pole housing, a substantially cup-shaped gearbox, secured by its face end to the pole housing, for receiving at least one transmission gear wheel that meshes with a worm connected to an armature shaft of the armature. The armature shaft has a mushroom-shaped stop face on its face end, against which a spring for generating a defined initial stress comes to rest. The spring is a curved bendable spring, which has a substantially V-shaped profile, with a tensioning plate secured in the gearbox and with a leg that yields in the axial direction of the armature shaft, which in the installed state of rest, the spring exerts a spring force, on the mushroom-shaped face of the armature shaft.

Abstract: An electric motor (1) or drive motor has a cylindrical, possibly, however, even conical or disk-shaped rotor (2) and a cavity or interior space (4) surrounded by the rotor (2) and/or its stator (3), into which protrudes in the installed position an epicyclic gear system (5) or planetary gear system which is driven by the electric motor (1). The electric motor (1) has a toothed power output element, for example, a cantilevered gear shaft (6), with which meshes an opposing-teeth-exhibiting power input element, for example, the planetary gears (7) of the epicyclic gear system (5).

Abstract: An electric motor includes a plurality of coils through which passes a ring rotor having a plurality of magnets supported thereon. The magnets are arranged about the ring rotor to be equidistant from an axis of rotation coinciding with the motor output shaft. The polarity of the magnets are alternated with North poles of adjacent magnets facing toward or against the direction of rotation of the rotor. The position of the rotor is detected and correspondingly electrical energy is applied to the coils to induce electro-magnetic fields which couple and superimpose with the magnetic fields of the permanent magnets. When the electrical energy is alternated between a certain voltage level and its inverse, each coil is able to simultaneously attract and repel adjacent magnets, thereby causing rotational movement of the rotor. The coils may be formed with superconducting materials and enclosed so that they may be cooled to superconducting temperatures. Other features to improve motor efficiency are shown.

Abstract: A motor includes a first stator yoke which is excitable by energization into a first coil, a second stator yoke which is excitable by energization into a second coil, and a rotor which can be driven for rotation under the control of energization into the first coil and the second coil, wherein the first stator yoke and the second stator yoke are disposed in the rotational axial direction of the rotor, while the rotor is provided with a rotational output portion which can take out the rotational output with a gap between the first stator yoke and the second stator yoke. By this arrangement, a novel motor can be configured to take out the rotational output without problems of noise generation in the motor transmission drive, fully coping with the mounting conditions on the products.

Abstract: A starter comprises a fixing member which has a cylindrical portion and rotation stoppers on the outer wall of the cylindrical portion and is fixed to a bracket so that its movement in a circumferential direction is limited by the rotation stoppers, a mating portion is formed by mating the inner surface of the cylindrical portion of the fixing member with the outer surface of the internal gear of the epicyclic gear reduction unit, and the mating portion is set such that the internal gear slides and rotates with respect to the fixing member when rotation torque applied to the starting output shaft exceeds a predetermined value by machining the end surface of the cylindrical portion of a provisional mating portion formed by provisionally mating the inner surface of the cylindrical portion of the fixing member with the outer surface of the internal gear. Therefore, the breakage of elements of the output transmission system of the starter can be prevented.

Abstract: A two-phase electro-mechanical stepper motor has a first and second rotor fixed on a shaft. Permanent magnets are mounted on each of the rotors. The magnets each have several north and south pole magnet regions that are oriented such that the magnet's north and south pole magnet regions are misaligned with respect to the other magnet's north and south pole magnet regions. A first and second stator are mounted around the shaft and positioned adjacent to the permanent magnets. The stators have coils that are wrapped around poles to allow the formation of electromagnets by passing electrical current through the wire coils. A gear train is positioned between the first and second rotors to obtain a higher torque output.

Abstract: An electric drive unit, for windshield wipers of a motor vehicle, including a drive motor, having an armature accommodated in a substantially cup-shaped pole housing, and including a gearbox, secured by a face end to the pole housing for receiving at least one worm, wheel supported on a power takeoff shaft. The worm wheel engages a worm connected to an armature shaft of the drive motor. The power takeoff shaft is supported in an eccentric bush which is rotatable to set the axial spacing between the armature shaft and the power takeoff shaft and can be mounted in the rotated state, in a manner fixed against relative rotation, in the gearbox. The eccentric bush is embodied in a graduated fashion, such that it has a larger diameter on a side toward the flange than on another side remote from the flange.

Abstract: The invention concerns a compact drive with an electric motor, a frequency converter and a gear. Such a drive should be made in the most compact way possible. For this purpose frequency converter is arranged at one front end of the motor and the gear is arranged at the other front end of the motor.

Abstract: A contact shaft moving device that reduces the wearing of a pinion in a ring gear. More specifically, the contact shaft moving device moves a contact shaft in such a direction as to cause a moving contact to be in direct contact with a stationary contact after a plunger is attracted and moved for a certain period of time by an exiting coil. The movement of the plunger also assists in moving the pinion into abutment with the ring gear prior to contact between the moveable and stationary contacts.

Abstract: A compact, self contained brushless motor assembly which has a stator fixedly mounted onto a hub. Located about the stator is a rotor with a shaft being connected to the rotor which is conducted through a center through hole formed within the hub. A heat sink is attached to the hub. A controller is mounted onto the heat sink with heat generated by the controller to be dissipated by the heat sink. Rotation of the rotor causes rotation of a shaft which passes through the center through hole with this shaft to be optionally connectable to a planetary gear system. The planetary gear system is to be mounted within an alcove formed within the heat sink.

Abstract: A drive apparatus, in particular for the automatic actuation of a sliding door of a motor vehicle, comprising a fast running motor, the motor shaft of which is connected to a transmission with a large step-down ratio, the transmission having a first gear wheel which can be secured against rotation, via a releasable blocking device, and a second rotatable gear wheel which is rotationally fixedly connected to an output drive shaft and which is rotatable relative to the first gear wheel by the rotation of the motor when the first gear wheel is blocked, with the number of teeth of the first gear wheel only differing by a few teeth from the number of teeth of the second gear wheel and with the large step-down ratio being determined by this difference of the tooth numbers. By releasing the blocking device, the step-down ratio of the transmission changes. In particular a step-down ratio of 1:1 results.

Abstract: An actuator for an HVAC system includes a motor coupled by an electrically operated clutch to a gear train which drives an output connector. A spring is connected to the transmission to drive the output connector to a normal position in the event of a power failure. A control apparatus is connected to the transmission and provides the combined functions of a magnetic eddy current brake and a motion sensor.

Abstract: A compact miniature motor includes a DC motor, a worm gear, a pinion transfer gear, at least one cluster gear, an output gear, and an output shaft. A socket may be used to accept the output shaft. The gears form a gear train that wraps tightly around the DC motor in the shape of a capital letter J. Inverted trunnions stabilize the pinion transfer gear by extending longitudinally inside thereof. Acoustical chambers packed with grease suppress noise generated by the gear train. A PC board is also provided and has components for rectifying, filtering for constant DC, and modifying AC voltage before passing it to energize the DC motor. The output shaft may drive a product mover for beverage cans inside a vending machine or another type of electromechanical unit requiring the application of high torque.

Abstract: Feedback potentiometer-type servoactuator uses the ring gear of a planetary gear system to drive the wiper across a resistive arc of less than 360.degree. where the actuator has a travel of multiple turns. The ring gear is supported by spaced struts in the actuator housing.

Abstract: A geared electric motor 1 used for power window apparatuses, for example, which is provided with an mature 7 having an armature shaft 7a, an output shaft 8 connected with the armature shaft 7a through a worm gear pair (7a7 and 17) and two friction plates 9 and 10 to be in contact with both end faces of the armature shaft 7a. The armature shaft 7a of this motor 1 is prevented from rotation by frictional resistance generating between the friction plates 9, 10 and the armature shaft 7a even if the output shaft 8 is applied with rotatory force.

Abstract: An improved gear train for the adjustment structure in a mirror includes a slip clutch disk connection that allows a pinion gear to rotate relative to an intermediate gear reduction. The pinion gear is engaged to rotate a rack, and the rack is connected to the mirror to adjust the position of the mirror. The rack is spring biased into engagement with the pinion, thus insuring that the two move with each other quietly and smoothly. The rack can be biased into engagement with the pinion gear, since it need not be able to slip relative to the pinion gear, as was the case in the prior art. The clutch disk allows the pinion gear to move with the rack when the mirror is manually adjusted. The inventive clutch disk is relatively simple, including a clutch drive gear rotatably journaled on a drive shaft. The drive shaft is fixed to rotate with the pinion gear. A spring biases a friction face of the clutch drive gear into engagement with the clutch disk, which also rotates with the pinion gear.

Abstract: A gear motor (1), with an electric motor (4) whose rotor (7) has a hollow shaft (8), drives, through at least one gear box (26) with at least one drive step, at least one load. For the purpose of compact configuration combined with low vibration, there is coaxially disposed in the hollow shaft (8) an output shaft (19) which can be shifted selectively by means of a first clutch (24) to the hollow shaft (8), and by means of a second clutch (16) via the gear box (26) to the hollow shaft (8). Preferably the clutches are configured as magnetic clutches, and again preferably the first clutch (24) is disposed for the direct shifting of the hollow shaft (8) to the output shaft (19) at the one end of the hollow shaft (8), and the second clutch (16) at the other end of the hollow shaft (8). The gear motor (1) is used preferentially for driving rotary parts in crystal pulling apparatus.

Abstract: End segments of a Lundell-type rotor for an AC generator, wherein the base and the teeth portions thereof are compaction molded separately and subsequently joined together and sintered.

Abstract: A miniature motor with worm reduction gear outputting the revolution of a miniature motor via a worm reduction gear consisting of a worm and a worm wheel, in which the tooth surface of the worm is roughened into a stain finish, and then subjected to a surface treatment to improve wear resistance.

Abstract: A motor with a decelerating apparatus includes a motor, a gear box connected to the motor, a pinion gear attached to an end of an output shaft of the motor, two or more decelerating gears engaging with the pinion gear, a rotation shaft connected to each of the decelerating gears as a unity, a bearing for supporting the rotation shaft of each of the decelerating gears provided in the gear box, and a mounting unit for fixing the gear box to a load, an output terminal of the rotation shaft of each of the decelerating gears being connected to a rotating load, the gear box comprising a bearing for supporting a rotation shaft of a first decelerating gear which engages with the pinion gear and a bearing for supporting a rotation shaft of a second decelerating gear which engages with the pinion gear and is different from the first decelerating gear in the number of teeth, the mounting unit connecting the output terminal of the rotation shaft of either of the first and second decelerating gears to the rotating load, a

Abstract: An actuator which comprises a reversible motor, a solenoid, movable clutch disc to be attracted by the solenoid, a driving clutch disc supported rotatably between the movable clutch disc and the solenoid and driven by the motor. The movable clutch disc and the driving clutch disc are provided with teeth to be engaged with each other and having inclined engaging flanks so as to be disengaged from each other due to slippage caused between the inclined engaging flanks of the teeth. According to this invention, it is possible to interrupt a force larger than a predetermined value and transmit reliably a smaller force to prevent damage to the throttle members.

Abstract: A speed governor comprises a speed increasing wheel train and an electroconductive plate confronting a magnet, the electroconductive plate integrally formed with the final stage of the speed increasing wheel train, a disk-like yoke, a cup-like yoke, abutted against the disk-like yoke, enclosing the electroconductive plate, a magnet fixed on one of the disk-like yoke and the cup-like yoke, and a plurality of inclined surfaces formed on a circumferential end surface of the cup-like yoke, each of the plurality of inclined surfaces identical with each other, each of the plurality of inclined surfaces abutted against a projection of the disk-like yoke whereby one of the disk-like yoke and the cup-like yoke can be moved in a circumferential direction.

Abstract: A geared motor having a gear case and a motor housing. The gear case contains reduction gears and a viscous grease which lubricates the reduction gears and fills the a gear case. An integrally formed main oil seal having a main lip and a dust lip and a sub oil seal having a sub lip are disposed between a rotor shaft of the motor and the motor housing. The sub oil seal is disposed between the gear case and the main seal to prevent the viscous grease and metal powder in the viscous grease resulting from wear of the gear (101) from jeopardizing the main seal. In some embodiments, a second grease is retained in a space formed between the sub lip and the main lip. An outer wheel of a ball bearing supports the rotor shaft and is fixed to the bottom of the motor housing so that the rotor shaft cannot move in its axial direction and so that the rotor shaft will be firmly sealed by the main oil seal and the sub oil seal.

Abstract: A built-up stepping motor includes upper and lower housings each having an internal space and joined together with a support plate disposed therebetween. The lower housing retains therein a stator and a rotor disposed in the stator, while the upper housing holds therein a reduction gear for reducing the output speed of the motor. The output end of a rotor shaft extends through the support plate and meshes with a first gear of the reduction gear. The upper and lower housings are assembled together by interlocking engagement between locking projections and mating holes. A shock-absorbing damper is disposed between two stator cores to protect them against chattering.

Abstract: A coaxial starter motor comprising a d.c. motor having a hollow rotary shaft extended forward and a planetary speed reduction gear having a sun gear disposed on the outer periphery of the rotary shaft. The starter motor comprises an over-runing clutch of which inner sleeve rotates in one direction and is provided at the inner circumference with helical splines, the over-runing clutch being disposed on the front side of the rotary shaft and rotated at a reduced speed by the planetary gear speed reduction gear. Also provided is an output sleeve mounted on the front end portion of the rotary shaft and having a pinion at its front end portion and axially movably and relatively rotatably supported by a bearing, in which helical splines formed close to the rear portion of the outer periphery is in mesh with helical splines of the inner sleeve. A solenoid switch is disposed on the rear end portion of the d. c.

Abstract: An adjusting device with an overload slip system and a slip-independent position indicator includes a driving system and an adjusting member movable by the driving system between two end stops. The driving system includes an electric motor housed in a housing and a planetary transmission connected to the motor shaft, the power output shaft of the transmission being in engagement with the adjusting member. A stationary, internally toothed ring of the planetary transmission is confined between facing peripheral edges of the divided housing and is capable of slipping relatively to the edges of the housing under overload conditions. A support plate with a circular electrical resistor is fixedly connected to the housing on the side of the power output shaft. A runner contact connected to the power output shaft is movable over the resistor.

Abstract: In this gearless, induction-type planetary reducing coupling, electric currents induced in the collars of the driving rotor react with the inductive magnetic field carried by the self-excited planet wheels causing the planet wheel hubs to roll along circular tracks. Skidding is prevented by similar electromagnetic interaction in other, stationary rings. Said rolling action drives planet wheel carriers attached to the output shaft, effecting a power take-off with speed reduction from a very high rotational speed. The device is thus suitable for miniature turbines, whether driven by gas or steam, operating too fast for mechanical gear trains, and can be used to manufacture low-cost turbomotors and turbogenerators, for example using existing turboblowers converted into gas turbines by adding a combustion chamber and burner; this coupling, being reversible, serves as the starter therein.

Abstract: A starting device comprises a cylindrical driving shaft, a rotary output shaft placed contiguous to one end of said driving shaft and extending in alignment therewith, a speed reduction unit for reducing revolution of said driving shaft to transmit power from said driving shaft to said rotary output shaft, and a power transmitting shaft which is firmly connected in alignment with said rotary output shaft and is passed coaxially through said driving shaft so as to be rotatable therein, one end of said power transmitting shaft extending from the other end of said driving shaft.

Abstract: A dual duty drive for an actuating mechanism, for example a pump or a fan, incorporating an induction motor and an electromechanical reduction gear unit. The economical and reliable operation in the rated duty is ensured by delta connecting the motor windings, and with current being applied across the field winding of the electro-mechanical reduction gear unit, the latter is caused to operate with a gear ratio close to unity. Under a fractional load duty, the motor windings are star connected and the electro-mechanical reduction gear unit is deenergized, causing the latter to operate in the step-down reduction mode.