Abstract: The invention provides an armature rotor for electromagnetic retarder, comprising at least one disc (2) extended axially on one of its faces by a plurality of fins (9), each fin being defined by two parallel or substantially parallel faces slanted with respect to the corresponding radii, the tips of the fins being connected together by an annular flange (11) and the assembly formed by the disc, the fins and the flange being made as a single moulded block from ferromagnetic material. The fins (9) of said rotor are particularly thin, numerous and so close together, the thickness of each fin being less than 5 mm and the width of the gap between two consecutive fins, in its narrowest zone, considered perpendicularly to the facing faces of the fins, being less than 10 mm.

Abstract: An eddy current brake for braking the rotation of a rotating shaft driven by a drive including a rotatable, stamped one-piece inductor drum member connectable to a driven shaft, having a radially extending portion and an axially extending portion spaced from and substantially parallel to the axis of rotation of the driven shaft. A pole assembly is located within a volume defined by said drum member and is rigidly attached to an end adaptor plate of the drive. The pole assembly includes a pair of stamped pole members each defining a plurality of poles which are placed in a confronting, interdigitated relationship upon assembly.

Abstract: A resistance applying mechanism for use in an exercising apparatus having a support frame on which a bicycle provided with at least a saddle and foot pedals is supported includes a rotary shaft rotatably supported by the support frame and driven by operating the foot pedals; a rotating disk made of metal and fixed to the rotary shaft; and at least a pair of permanent magnets for generating an eddy current placed opposite each other with the rotating disk interposed therebetween.

Abstract: An eddy-current intermediate rotor (13) is fixed to the motor shaft (9) and is arranged to be rotatable between the stator-iron poles and the permanent-magnetic rotor (15) which is mounted for free rotation on the motor shaft (9). The rotor (15) and the eddy-current intermediate rotor (13) are disc-shaped and form a disc assembly (23) which can be axially magnetized via the stator-iron poles (3) on each side of the disc-assembly (23). A centrifugal coupling is provided, which acts to couple the rotor (15) to the eddy-current rotor when the disc assembly has come up to speed.

Abstract: A disk drive actuator including automatic eddy-current braking capability, enhanced by simple modifications of coil-mount structure, such as split damping ring DR and spaced-rib array, this array shown for example in FIG. 12 (see DR-R).

Abstract: Method and apparatus for controlling an electromagnetic powder clutch connected to a vehicle engine and including a coil for engaging the powder clutch to transmit an output torque of the engine as a function of an electric current to be applied to the coil such that a variation in the engine torque is absorbed by a slip of the powder clutch. An optimum amount of slip of the powder clutch is determined based on a currently required engine output and a detected output speed of the clutch. A basic control value for controlling a magnitude of the electric current to be applied to the coil is determined based on the detected engine torque, such that the determined magnitude of the electric current permits engagement of the clutch so as to transmit the detected engine output torque. The basic control value is compensated for the determined optimum amount of slip of the clutch, thereby adjusting the transmission torque of the clutch so as to absorb the variation in the output torque of the engine.

Abstract: A bicycle ergometer includes an eddy current brake having a flywheel rotor assembly including an inner part of iron material having a carbon content of 0.12% or less and a silicon content of 0.35% or less, a stator provided inside the rotor assembly, a plurality of exciting coils provided on the stator, and a power source for energizing the exciting coils. The outer part of the flywheel rotor can be made of concrete. The ergometer includes an input panel for inputting physical attributes of the user, e.g., age and sex, a pulse sensor for measuring the heart rate of the user at rest and during exercise on the ergometer, an arithmetic control circuit for calculating a training program and heart rate range and for controlling the eddy current brake to present a load to the user which will maintain the user's heart rate in a predetermined range.

Abstract: A rowing exercise machine has a horizontal tubular member on which a seat is mounted on rollers for movement along the member. The horizontal member also mounts foot rests which may be removable. A flywheel assembly is mounted either at the front or rear end of the horizontal member. The flywheel assembly includes a flywheel and a one-way clutch connected to the flywheel. The flywheel is rotated by a user pulling on a handle which is connected by cables, chains or toothed belts to sprockets connected to the flywheel through the one-way clutch. The handle, cable or chain is attached to a slide that moves within the horizontal member and a tension cord is also connected to the slide to urge the handle through a retracted position. The clutch is disengaged when the handle retracts. The flywheel has a non-magnetic, conducting rim portion that passes through a magnetic field created by a stationary field piece having one or more field coils.

Abstract: An electric retarder for vehicle is provided comprising on the one hand an inductor stator comprising a ring of electric coils (3) supported by an annular framework (1), which framework includes a central socket (5), radial arms (6) extending this socket and a ring (8) carried by these arms and supporting the coils, and on the other hand, an armature rotor comprising two magnetic disks (20) both connected, through rings of bent arms (14), to a central collar (15), itself secured angularly to a section (17) of the shaft of the vehicle to be slowed down. The socket has a truncated cone shape, the collar is connected to a central cylindrical pot (16) covering the narrow end of the socket and the shaft section is mounted in this socket via a small bearing (19) housed in the pot and a large bearing (20), of the axial thrust type, disposed at the widened end of the socket.

Abstract: A plurality of permanent magnets mounted at equally spaced angular intervals on a drive shaft are rotated past a plurality of electromagnets at equally spaced fixed angular intervals about the axis of the shaft on a plate supported by a frame. An electric motor drives the drive shaft. The electromagnets are connected across each its own capacitance. At the appropriate speed of rotation the frequency of electrical energy generated by the permanent magnets as they pass the electromagnets causes resonance to occur. This action controls the drive shaft speed. A plurality of capacitors is attached to the base plate and the cross bars of the frame supporting the plate.

Abstract: A coupling device for the transmission of an axial movement from a lift generator to a rotatable, axially movable body, composed of: a component creating a pressure-transmitting contact between the lift generator and the body; and a device including a magnet producing a magnetic field which creates a magnetic attraction force between the lift generator and the body.

Abstract: An eddy current coupling for a dynamo-electric machine. A flux path between a rotating drive shaft and a rotatable driven shaft includes an inductor drum connected to the drive shaft and a pole assembly coupled to the driven shaft. A coil assembly partially surrounded by the pole assembly controls the degree of electromagnetic coupling. A series of interdigitated pole fingers are spaced between the inductor drum and the field coil assembly to facilitate air flow that dissipates heat caused by relative rotation between the inductor drum and the pole assembly. The coil assembly includes an annular coil support co-axial with the driven shaft to support an annular field coil in a gap defined by the pole assembly.

Abstract: An electric speed reducer of low power designed essentially for equipping home trainers comprises an armature rotor composed of two parallel discs of magnetic material fastened to the same shaft. The shaft is itself mounted on a suitable frame through bearings. The inductor stator is arranged so as to be mountable radially removably between the two discs, and comprises for this purpose a single pair of cores of cylindrical or prismatic material whose generators are parallel with the axis of the speed reducer, and of which only the first is surrounded by a coil of electric wire.

Abstract: An armature rotor for an electromagnetic retarder includes at least one disk (2) made from a ferromagnetic material connected to an inner fixing ring (7) by an annulus of arms (9) forming ventilation fins, the largest diameter portions of these arms projecting axially from the face of the disk opposite the air gap (E), and the crests of these portions being joined together by an annular web (10), the assembly formed by the disk, the ring, the arms and the web being formed of a single molded block. The maximum outer diameter of the ventilation stucture formed by the arms and the web is greater than the outer diameter of the disk, considered at the level of the mean plane of this disk. Two thin collars (13 and 14) defining therebetween a groove (15) extend the two axial faces of the disk radially outwardly.

Abstract: An electromagnetic brake device for a sports training apparatus, especially an ergometer, includes a stator, and a rotor rotatable in relation to the stator about a rotation axis. The stator and the rotor each have multi-pole iron circuits which together form a magnetic flux circuit, one of the iron circuits having magnetic remanence properties. With the iron circuits, there are associated windings of which the winding allocated to the magnetically remanent iron circuit is formed as field winding and the other winding is formed as generator winding. The field winding is connected through a slip ring arrangement with the generator winding. With the iron circuit of the generator winding, there is associated a short-circuit winding. The size amplitude of the current fed to the field winding from the generator winding is adjustable by a control circuit. In this way, the electromagnetic brake moment of the brake device can be adjusted without wear.

Abstract: An eddy current coupling has a field coil (42) for magnetically coupling an inductor drum (26) and rotor (28). The thickness of the supporting arm (48) for the coil increases in a step-wise manner in a direction away from the end of the arm. The diameter of the adjacent portions (30) of the rotor is reduced in a corresponding manner to provide a plurality of air gaps (54a, 54b, 54c) across which the flux passes in radial directions. The flux passage and heat removal characteristics of the coupling are enhanced.

Abstract: In an eddy current retarder, more especially for vehicles, each enlarged pole shoe (5) is shifted circumferentially rearwardly, with respect to the axis (Y) of the corresponding magnetic core (2), i.e. in the direction opposite that (F) of the rotation of the rotor.

Abstract: A speed governor for use in a time-delay switch having an adjustable delay time, low amount of operating noise, high braking force, and simple construction. Two generally annularly shaped magnets are disposed on opposite sides of a conductive disk rotated at a higher rate than an input member by an accelerating gear train. One of the magnets is stationarily mounted while the other is rotatably adjustable in position via an adjustment plate having an adjustment lever extending outside of the casing of the device.

Abstract: A brushless alternator is disclosed having a stationary field coil and core surrounded by a stationary stator coil and core with a cylindrical air gap being defined therebetween. A rotor assembly is fixed to a rotatable shaft and has interweaved separate magnetic finger assemblies joined together by a non-magnetic ring wherein these fingers are rotated in the cylindrical gap. The stator and field cores are radially disposed with respect to the rotatable shaft. The field core axially extends beyond the effective axial length of the field coil and provides at an axial position beyond the effective axial length of the field coil, at least one low reluctance axial flux gap between the field core and the magnetic fingers. This flux gap conducts a substantial portion of the flux created by the field coil. The field core also serves as a shaft bearing retainer and has a bearing grease reservoir comprising a cylindrical recess adjacent the shaft bearing.

Abstract: A magnetic brake for braking the line spool of a fishing reel with magnetic braking automatically adjusted in dependence upon the speed of rotation of the line spool. A magnetic support for magnets is rotatable in one direction by the reactive force of the braking torque on the magnet support and in the opposite direction by an adjustable spring load. The reactive force of the braking torque tends to displace the magnet support in a direction to move the magnet poles away from a surface rotating together with the line spool, while the spring load tends to displace the magnet support in the opposite direction to decrease the distance between pole ends and the rotating surface moving with the line spool. Inclined camming grooves in one embodiment move along a guide pin to cause the rotating action of the magnet support to move the support in an axial direction.

Abstract: A braking system for a rotating spool casting reel comprising a pair of diametrically opposed weights that are driven outward by centrifugal force, opposed by tension springs. At the beginning of the cast, the weights are driven outward into cooperation with an outer braking medium to produce an initial drag. As rotation decelerates, the drag decreases until the springs bring the blocks into engagement with an inner cylindrical surface that produces a substantial frictional drag to bring the spool to a stop to minimize the chance of overrun. Either the weights or adjacent reel housing is provided with magnet means and the other is made with electrically conductive material to augment the braking action.

Abstract: A fishing reel having a spool and a magnetic brake for reducing an overrun of the spool is provided with an adjuster to adjust the braking effect of the brake, a stopper holding the adjuster in its adjusting position, and a lever for releasing the holding of adjuster to cause a maximum braking effect on the spool.

Abstract: An improved damping structure for a bait casting reel with magnetic spool damping structure. Fibers or the like are provided on a member associated with the spool and moving in a magnetic field and disrupt air flow in the magnetic field as the reel is operated. The resultant damping force on the spool is a combination of forces due to the rotation of the member in the magnetic field and the disruption of the air flow by reason of the placement of the fibers in the magnetic field.

Abstract: A fishing reel is provided with a spool and a magnetic brake for reducing overrun of the spool. The spool has a frame member which rotatably supports the spool, a cylindrical electric conductor rotatable together with the spool, and a magnet holder having at least one magnet positioned at one side of the holder radially of the conductor and opposite thereto. The holder has a support unit which supports the holder to the frame member so that the magnet can be adjusted radially toward or away from the conductor to thereby adjust the braking of the conductor. The support means includes a control member which controls the holder to move toward the position where the magnet is adjusted.

Abstract: A rotor for use with a hysteresis motor in combination with a centrifuge rotor having a hub. The motor has a stator with an axial length and the motor rotor has a region coextensive with the stator. The motor rotor includes a hollow cylindrical body made of a magnetizable material, having one end firmly connected to the hub, and having a wall with a first thickness in the region that is coextensive with the stator and a second thickness, smaller than the first thickness, which is outside of the region that is coextensive with the stator and which is in the region of the connection of the cylindrical body with the hub. The point of transition from the first thickness to the second thickness of the wall is a predetermined distance from the nearest point of contact of the hub with the cylindrical body so as to increase the magnetic resistance between the hub and the cylindrical body.

Abstract: A simple, inexpensive, and effective linear actuator design comprises a motor adjacent to a speed-reducer, with the driven stem of the speed-reducer passing through the rotor of the motor. The stem has one bearing at one end of the reducer and its second bearing at the end of the motor, in a bearing part likewise serving as a bearing for the rotor. The distance between the two bearings is increased, and the second bearing includes a socket which has a radial elasticity owing to the fact that it is monolithically joined to the fixed bearing part via a thin portion. This second bearing part is advantageously of synthetic material. The rotation of the stem actuates a driven linear-motion part, which is prevented from rotating and which executes a translatory movement.

Abstract: An anti-backlash fishing reel comprises a pair of side frames connected by pillars. One of the side frames supports the gear drive mechanisms. A handle projects beyond the side plate or cap attached to that frame. At the other side of the reel, the anti-backlash mechanism is located. A mounting disc or retainer case has its rim clamped to the opposite frame member by a cap or side plate. The mounting disc or retainer case carries magnetic field forming means on its inside for cooperation with a conductive eddy current drum or segment of the line spool. The mounting disc or retainer case also accommodates a bearing for the end of the spool shaft. The spool shaft is extended outwardly of the mounting disc or retainer case to mount a click wheel. Detachment of the cap or side plate allows servicing and cleaning of the magnetic field forming means without disrupting the drive mechanism at the opposite side of the reel.

Abstract: An eddy current coupling (11) includes a housing (13, 15, 17), a rotor member (29), inductor drum means (25) rotatable about an axis of rotation relative to the rotor member and coil means (41) for electro-magnetically coupling the rotor member and inductor drum means. The housing includes a non-circular central portion (13) having an opening at both ends thereof which is expandable in a radial direction perpendicular to the axis of rotation and first (15) and second (17) end members. The central portion of the housing defines a chamber (80) for receiving the rotor member, inductor drum means and coil means. The first and second end members include pilot surfaces (84, 90) thereon.

Abstract: A winding machine for longitudinal slit strips, with slides which carry pendulum arms with receivers for winding cores and are movable, on a guide, transversely to the longitudinal slit direction, a driving drum being positioned beneath the guide, which driving shaft is frictionally connectable, with a driving wheel of each slide, and each driving wheel driving the winding core receiver of the specific pendulum arm. The technical problem is in the facility and shortening of the re-tooling to other slitting widths as well as in the adjustment of the winding tension. The driving shaft comprises a continuous peripheral surface. Each driving wheel is provided as a friction wheel which is brought into frictional engagement with the driving shaft. Each driving wheel is coupled via a clutch, preferably an eddy-current clutch with adjustable clutch disk, to a driving shaft.

Abstract: A brushless electric micromotor comprised of a rotor, a shaft and a tube-like part and permanent magnets rotatably mounted and hermetically sealed in a rotor housing, said shaft being supported in bearings. The permanent magnets have their co-axial surfaces coated with a layer of an electrically conductive metal. The micromotor further comprises a stator co-axially surrounding the rotor housing and comprising field windings regularly arranged with equal angular distances in the stator housing made of magnetic material.

Abstract: Conveying device for continuous threads with a thread accumulator to which there is coordinated a brake mechanism, regulating the thread feed, and a coupling mechanism comprising an annular magnet (10) whose winding (9) is surrounded by a two-piece housing concentrating the magnetic field lines, one housing part (7) being rotatably mounted and permanently connected with the drive and forming a slot (11) relative to the other, stationary housing part (8), the slot width, in the peripheral direction, varying in uniform distribution, and into which slot there is inserted a ring (14) made of electrically conducting material, which ring is jointly rotatably connected with the power take-off axle (18).

Abstract: An eddy current coupling (11) includes a housing (13, 15, 17), a rotor (29), an inductor drum means (25), coil means (41) for electro-magnetically coupling the rotor member and the inductor drum means and a slip ring assembly (45) for energizing the coil. The slip ring assembly includes a first support member (55) connected to the rotor member for rotation therewith, slip ring means (47, 49) for energizing the coil means supported by the first support member, a second support member (56) and brush means (51, 53) supported by the second support member. The first and second support members define a sealed chamber (80) in which the slip ring means and brush means are located. A passageway means (92) is provided from the sealed chamber for directing wear debris generated by the contact between the brush means and slip ring means from the sealed chamber. An impeller (98) is provided for impelling the debris through the passageway means and from the chamber.

Abstract: An eddy current coupling 11 includes an input member 19, an output member 21 rotatable relative to the input member about an axis of rotation, a pole assembly 29, an inductor drum assembly 25 and a field coil 41 for coupling the input and output members. The inductor drum assembly 25 includes a generally cylindrically drum portion 27 and a radially extending drum portion 26. A heat dissipating member 71 integrally formed from a heat conductive material such as aluminum is attached to the radially extending portion 26 of the inductor drum assembly. The heat dissipating member includes heat dissipating fins 75 on one side thereof and rivet means 77 on the opposite side thereof for connecting the integrally formed heat dissipating member 71 to the radially extending portion 26 of the inductor drum assembly. The rivet means 77 act to transfer heat from the inductor drum assembly 25 to the heat dissipating member 71.

Abstract: An inside-out hysteresis synchronous motor for use with inertial sensors and having a hysteresis ring magnetically isolated from the motor structure while maintaining the thermal expansion loop of the motor structure.

Abstract: A rotating electric machinery comprises a stator; a rotor which is fixed to a rotor shaft and is driven by said motor; a fan which is rotatably connected through a bearing to said rotor to feed air in a predetermined direction; and at least one pair of magnets having a predetermined magnetic force which are fixed on either said rotor or said fan and a magnetic substance having a predetermined coercive force which is fixed on said fan or on said rotor to face said magnet with a desired gap.

Abstract: An electromagnetic coupling device includes an input member, an output member rotatable relative to the input member, and a pole assembly associated with one of the input and output members. The pole assembly includes a pair of annular, oppositely disposed pole members and an annular core member disposed between the pole members and defining an annular cavity therebetween. An electrically energizable field coil element is disposed in said cavity for electromagnetically coupling said input and output members. The pole members each including a plurality of circumferentially spaced, radially extending pole slot means disposed for communicating the exterior of the pole assembly with the core member to provide substantially uninterrupted access thereto.

Abstract: A hysteresis tensioning device 10 incorporates an improved apparatus for setting and maintaining an air gap 48 between a hysteresis ring 32 and a magnet 36. The hysteresis ring operates in a fully saturated magnetic force field, and is thus amenable for tension control in environments subject to wide temperature variations. To the extent that magnetic tape recording is involved, the apparatus incorporates the use of magnets which are structured for being fixed relative to magnetic tape heads associated therewith, whereby any associated flux leaks are of the direct current type only. In a preferred embodiment, the device includes a pulley assembly 12 rotatably mounted on a bearing 20 having an inner race 22 supported on an axially disposed pulley shaft 16. The assembly includes a hysteresis ring 32 bonded to one side of a pulley sheave 18, the ring being axially spaced with respect to a magnet 36, whereby an air gap 48 is defined therebetween.

Abstract: A fishing reel which rotatably supports a spool shaft having a spool to a reel body through a pair of bearings and incorporates, into a bearing housing supporting one of the pair of bearings, a magnetic force brake which imparts a rotational resistance against free rotation of the spool shaft, has the bearing at the bearing housing incorporating the brake formed as a metallic bearing comprising a non-magnetic material.

Abstract: A liquid-cooled eddy-current coupling device is disclosed, having a field coil and rotatable inductor and rotor members within a housing, with the rotor member having a tubular extension with an exterior circumferential groove disposed to direct liquid coolant away from the field coil.

Abstract: An electromagnetic coupling device including a drive member coupled to the rotary shaft of an electric morot and a follower operating in response to the drive member. The drive member includes first and second magnet pole pieces and a magnetic path forming member. The drive member having a relatively large inertia, serves also as a flywheel. The follower is made to have a relatively small inertia to improve its response characteristic. The drive member has a space incorporating a fixed exciting coil and a fixed magnetic path forming member and a clearance accomodating eddy current generating plate thereby reducing the overall axial dimension of the electromagnetic coupling device.

Abstract: A shaft mounted eddy current variable speed drive or clutch has a hub which is adapted to be mounted on the shaft of a prime mover, such as an electric motor, and drives an armature. The hub includes an annular armature. A driven magnetic body is mounted for rotation on the hub and includes an array of poles magnetically associated with the armature through a working air grap and are energized from an electric coil mounted on the magnetic body. A slip ring assembly is also mounted on the magnetic body as well as an output pulley through which power is taken from the body. A non-rotating brush holder assembly, as well as a magnetic speed pick-up are mounted on a support bracket which bracket is, in turn, piloted to and mounted on the hub through a bearing. A torque arm prevents the rotation of the brush assembly and magnetic pick-up.

Abstract: An eddy current machine has a disc-type rotor mounted on a transversely disposed shaft and circularly arranged sets of adjacent poles of different polarity. A uniform flux path is provided for the magnetic lines of flux. The air gap between the pole faces and the rotor can be adjusted. Cooling fluid circulates around both rotor and pole faces.

Abstract: There is disclosed a device for displacing a video disk with respect to a reading head which includes the driving of a conductive disk by means of a video disk rotational motor. The conductive disk passes through the air gaps of two electromagnets located on either side of the displacement axis of a movable member supporting the rotational motor. By differentially energizing the electromagnets, a force is produced which provides for forward and backward movement of the complete movable member of the reader.

Abstract: An eddy current coupling has rotating and non-rotating flux paths to use the rotating portions as both magnetic and mechanical members, reduce physical dimensions of the coupling, and improve heat dissipation from the coil.The coupling (10) has an inductor (20) mounted on the input shaft. A magnetic rotor (22) is mounted on the output shaft with poles (30, 32) spaced from the inductor. A field coil (36) is positioned radially inwardly from the rotor and generates a flux, causing torque transmission between the inductor and rotor.A stationary field coil support (38) is mounted in proximity to the rotor poles for providing a stationary flux return path between the poles. The support is positioned with respect to the rotating element of the coupling, so that these elements may provide a rotating flux return path in parallel with the stationary flux path of the support.

Abstract: The present invention provides an electromagnetic coupling including a housing (13), the rotor (33), an inductor drum (25), including a generally cylindrical drum portion (27) having an outer heat dissipating surface including at least one generally circumferentially extending heat dissipating groove (57). A coil (47) is provided for coupling the rotor member and inductor drum. The housing includes openings therein for directing cooling fluid into the housing to dissipate heat generated in the inductor drum and a plurality of fluid directing means are attached to the outer heat dissipating surface of the inductor drum for rotation therewith. The fluid directing means (61) are obliquely disposed relative to the axis of rotation of the inductor drum to direct cooling fluid inwardly into heat dissipating grooves to cool the inductor drum.

Abstract: An eddy current coupling has telescoping input (12) and output (18) shafts to form a shunt (72, 74, 76) for the magnetic flux (78a) of the coupling around a bearing (66) between the shafts. This avoids the increased friction and heating effects and the magnetization of the bearing occurring when the bearing is exposed to the flux.

Abstract: A direct-current motor has a housing in which a stator and a rotor are mounted. A commutator is located in the housing but spaced from the stator and the rotor and subdivided from the same by a transverse housing wall. A magnetic coupling having two relatively rotatable elements is mounted in the housing extending through the transverse wall and the two elements define with one another an air gap in which a hood-like partition is located which is sealingly connected with the transverse wall so that the commutator is sealingly separated from the stator and rotor but is driven by one of the parts of the magnetic coupling which in turn is magnetically driven by the other part of the coupling that receives torque from the shaft of the motor.

Abstract: It is an eddy current speed reducer whose stator comprises a ring of coils 2 having their axes parallel to the axes of the speed reducer and whose rotor comprises two discs 3 framing the stator.The support for the coils is formed by a non-magnetic closed annular housing 9 containing the windings 6 of these coils and formed from two half-shells clamped axially one against the other by screwing flared pole pieces 7 on the cores 5 of the coils, these cores passing jointingly through openings 11 in the housing.A preferred application is to speed reducers developing relatively low braking torques.

Abstract: According to the invention, the eddy current machine load control device comprises a comparator having a first input for the supply of voltage of a predetermined magnitude and a second input connected to an output of an electrical machine load transducer which is an actual value transducer intended to convert mechanical stresses to electric signals. The device further includes a threshold element, a diode and a proportional-integral-derivative voltage regulator having its input connected to an output of the comparator, whereas an output of said PID voltage regulator is coupled via the diode to a controlled input of a controlled power source of the electrical machine.

Abstract: A water-cooled electromagnetic brake of this invention has a stator accommodating thereinside a movably mounted rotor with pole teeth and an excitation winding mounted on a ring with holes, while in the stator lids there are provided toroid-shaped collectors for cooling liquid having circular slots for the introduction of said liquid fed from a gap between the stator and rotor to the collectors, and ports in the lower portion of said collectors for the removal of the cooling liquid. Each one of the pole teeth of the rotor is provided with a recess in the central portion thereof located beneath the ring with holes while the peripheral portion of the tooth has a projection receivable in the space of the collectors, the inner edge of said collectors being fashioned as a baffle close to which a labyrinth seal is provided between the rotor and the stator.