Abstract: A drive mechanism for a motor vehicle, with a driven shaft and an electric machine, including a stator as well as a rotor mounted rotatably about an axis of rotation with respect to the stator, the rotor being coupled by way of an angular gearing to the driven shaft. An electrical winding of the stator and/or an electrical winding of the rotor projects in the axial direction, with respect to the axis of rotation, beyond a coil former to form a winding head and the angular gearing is arranged overlapping with the winding head at least in regions, when viewed in the axial direction.

Abstract: Air cooling devices driven by rotational power of an electric motor to expand air to thereby produce and supply cooling air. The air cooling device includes a power transmission device for increasing a rotational driving force of an expander that is disposed between an expander housing and the electric motor and for separating the expander from the electric motor. The power transmission device generates rotational magnetic field by receiving rotational power from the electric motor or receiving rotational power from the electric motor and external electric power. The rotating magnetic field generates a rotational force by interacting with magnetic field, based on attraction and repulsion forces. The air cooling device increases rotation speed and force when it transmits the power. The air cooling device increases a flow rate, and expands air adiabatically, thereby supplying cold air with high air density.

Abstract: A hybrid drive device that includes an input member drivably coupled to an internal combustion engine; a speed change device; a rotary electric machine disposed side by side with the speed change device in an axial direction and including a rotary shaft coupled to an input shaft of the speed change device; a case that houses the rotary electric machine and the speed change device; an intermediate support member disposed between the rotary electric machine and the speed change device in the axial direction and configured to rotatably support the rotary shaft and the input shaft; and a fastening bolt that fixes the intermediate support member to the case.

Abstract: A self-excited eddy current liquid-cooled retarder is disclosed. The retarder pertains to an auxiliary braking device retarding a vehicle, and comprises a retarder rotor, a retarder stator, a control module and a generator unit. The retarder rotor comprises a retarder coil, an electromagnet core and a core cage. The retarder coil is wound on a coil frame. The electromagnet core is inserted into the coil frame. The electromagnet core, the retarder coil and the coil frame are evenly distributed on the circumference of the core cage. The retarder rotor is connected to a transmission shaft of an automobile. The inner circle of the retarder stator and the outer circle of the electromagnet core of the retarder rotor are coaxial. The generator unit comprises a generator exciting winding, a generator exciting magnetic pole, a generator armature winding and a generator armature core and is received in the retarder rotor.

Abstract: A brake device with built-in power generation mechanism and permanent magnetism eddy current comprises: an external rotator including a flywheel and a permanent magnet fixed at an inner periphery of the flywheel; an internal stator including a fixing bracket and a tile-shaped armature mounted at an outer periphery of the fixing bracket; a brake mechanism including a magnetic-conductive plate; when the external rotator is rotated the tile-shaped armature generates a three-phase alternating current, and the arc-shaped metal plate generates eddy current and braking torque of magnetic resistant; a cooling fan mounted on the flywheel to produce a cooling effect; an adjustment mechanism provided for adjusting a gap between the arc-shaped metal plate and the permanent magnet to adjust magnetic flux, and thus change the braking resistant load; a controller transferring the three-phase alternating current into direct current for required power of the control panel and server.

Abstract: A moving element is connected to a rotor of an electric motor in a manner locked in terms of torque and, together with the rotor, forms a rotation element. An angle of inclination of the moving element in relation to the rotor is defined by bearing elements which are arranged on a circumference about the axis of rotation of the rotor, wherein the bearing elements each define axial distances between the rotor and the moving element. Each bearing element is formed by a first and a second axial section, and the moving element can be brought into different rotational positions in relation to the rotor so as to produce different pairings of the first and second sections, said pairings corresponding to different angles of inclination.

Abstract: An accessory system includes an accessory gearbox which includes a geartrain and a 2-Pole generator integrally mounted with the accessory gearbox such that a drive gear of the generator is in meshing engagement with the geartrain, containing a shear section, disconnect mechanism, and torsional compliance.

Abstract: To provide a driving force transmission mechanism in which the thickness can be reduced as well as the positioning between a driven shaft, a driven structure, and a motor shaft of a motor is easy. The driving force transmission mechanism as disclosed includes a plate through which a reference hole is pierced, a driven shaft vertically standing with respect to an inner surface on the side of the inner surface of the plate, a driven gear pivotally provided around the driven shaft, a bracket fixed to the plate so as to cover the reference hole on the side of the inner surface of the plate, and a stepping motor protruding a motor shaft toward the reference hole, being fixed to the bracket. The motor shaft is positioned through the reference hole with driving teeth formed at the motor shaft to be directly engaged with the driven gear.

Abstract: A motor may include a rotor having a rotation shaft, a stator disposed on an outer peripheral side of the rotor, a frame fixed to the stator, and an urging member made of metal for urging an end part on an output side of the rotation shaft to an opposite-to-output side. The frame includes a bottom face part, a stator fixing part which is formed to be bent from the bottom face part and which is fixed to the stator, and a shaft support part which is formed to be bent from the bottom face part so as to face the stator fixing part and which supports the end part on the output side of the rotation shaft, and the urging member is fixed by welding to an output side face which is a face on an output side of the shaft support part. The urging member is preferably a flat spring.

Abstract: A motor may include a rotor having a rotation shaft, a stator disposed on an outer peripheral side of the rotor, an output side bearing which supports an end part on an output side of the rotation shaft in a radial direction and an axial direction, a frame which is provided with a bearing holding part for holding the output side bearing and which is fixed to the stator, and an urging member which is attached to the bearing holding part for urging the output side bearing to an opposite-to-output side. The bearing holding part is formed with a bearing hole which penetrates through the bearing holding part and on which the output side bearing is disposed, and the output side bearing is disposed on the bearing hole in a movable state in the axial direction of the rotation shaft.

Abstract: The actuator system has a external rotor motor having: (i) an internal armature configured as a stator having a set of coils wrapped around a set of arms, and (ii) an external permanent magnet rotor having a set of poles configured to rotate less than 90 degrees around the stator. The actuator system has a drive shaft configured to be rotated by the external rotor motor. The actuator system has a drive train connecting the external permanent magnet rotor to the drive shaft, and configured to provide gear ratio to the drive shaft.

Abstract: A motor assembly (10) includes a permanent magnet DC motor (16) having a shaft (24) mounted for rotation with a face gear pinion (26) associated with the shaft. A jack shaft and clutch assembly (18) is associated with the face gear pinion and is constructed and arranged to prevent back drive of the motor under certain operating conditions. A spur or helical pinion (40) is operatively associated with the jack shaft and clutch assembly. A drive member (56) is operatively associated with the spur or helical pinion such that movement of the shaft and face gear pinion moves the spur or helical pinion to drive the drive member. A housing structure is defined by an upper housing (14) joined with a lower housing (12). The motor, the face gear pinion, the jack shaft and clutch assembly, the spur or helical pinion and the drive member are housed within the housing structure. Only one of the upper or lower housings includes mounting structure (25) constructed and arranged to mount the motor assembly to another object.

Abstract: An operation of drilling an earth borehole uses a drilling rig, a drill string of drill pipes having its generally upper end mechanically coupleable with and suspendable from the drilling rig, a drive string portion of the drill string, mechanically coupleable with the topmost drill pipe of said drill string, and a drive mechanism mechanically coupleable with the drive string for rotating the drive string and the drill string. A system for generating electric power in the region of the drive string includes an electric generator, which includes a rotating generator component mounted on said drive string for rotation therewith and a stationary generator component mounted on a stationary portion of the drilling rig. The rotating generator component produces electric power in the region of the drive string.

Abstract: A vehicle alternator for generating electric power is driven by an engine mounted on a vehicle driven through a driving belt. The alternator has a pulley part joined to and directly receiving a driving force from the engine through the driving belt, a field magnet part located in separation from the pulley part, a rotation speed changing part placed between the pulley part and the field magnet part. The rotation speed changing part converts the number of revolutions between the pulley part and the field magnet part. The rotation speed changing part decreases a speed changing ratio “S” according to increasing of the number of revolutions of the engine, where the speed changing ratio “S” is obtained by dividing the number of revolutions of the field magnet part by the number of revolutions of the pulley part.

Abstract: A polyphasic multi-coil generator includes a drive shaft, at least first and second rotors rigidly mounted on the drive shaft so as to simultaneously synchronously rotate with rotation of the drive shaft, and at least one stator sandwiched between the first and second rotors. A stator array on the stator has an array of electrically conductive coils mounted to the stator in a first angular orientation about the drive shaft. The rotors each have an array of magnets which are circumferentially equally spaced around the rotor and located at the same radially spacing with respect to the centre of the rotor and the drive shaft at a first angular orientation relative to the drive shaft. The arrays of magnets on adjacent rotors are off-set by an angular offset relative to one another.

Abstract: A generator unit for tractors (1) has a housing (4), which can be non-rotationally mounted on a component of the tractor (1). An input shaft is rotationally supported in the housing (4) and connectable to a power take-off shaft (2) of the tractor (1). An electrical generator (6) is coupled with the housing. The electrical generator (6) has a stator and a rotor, which is drive-wise connected to the input shaft and is driven by the same. The electrical generator (6) serves to driver electrical loads of the tractor 1 or of an agricultural device.

Abstract: An improved actuator (1) for water heating/cooling and sanitary systems includes a miniaturized D.C. Motor (2) with a mechanical clutch element (4), a first motor reducing unit (6) including a planetary reducing unit with a high gear ratio, a second reducing unit (14) for transforming a rotary movement into a reciprocating axial movement, and a supporting framework (29, 7, 9, 26) for supporting the components, and an electronic card (37) for controlling and driving the motor (2). A plurality of coupling adapters (33) allow the improved actuator (1) to be coupled to manifolds of different manufacturers.

Abstract: A rotational sensor of a motor includes a sensor magnet and a sensing element. The sensor magnet is secured to a driving-side rotator of a clutch, which is connected to a rotatable shaft of the motor, to rotate integrally therewith. The sensing element measures a rotational speed of the sensor magnet. Furthermore, the sensing element is secured to a motor case in such a manner that the sensing element opposes the sensor magnet.

Abstract: A powertrain includes a rotary input member such as an engine crankshaft, a torque coupling such as a hydraulic torque converter, a drive plate, such as a flex plate or spider, connecting the input member to the coupling, and an annular generator rotor having an electrical power annulus, such as an annular induction member extending around the coupling, and a mounting ring fixed to the power annulus and including means extending inward for securing the mounting ring to the coupling and to the drive plate. Several embodiments of mounting rings and assemblies are disclosed which improve methods for assembly of the powertrain.

Abstract: A powertrain includes a rotary input member such as an engine crankshaft, a torque coupling such as a hydraulic torque converter, a drive plate, such as a flex plate or spider, connecting the input member to the coupling, and an annular generator rotor having an electrical power annulus, such as an annular induction member extending around the coupling, and a mounting ring fixed to the power annulus and including means extending inward for securing the mounting ring to the coupling and to the drive plate. Several embodiments of mounting rings and assemblies are disclosed which improve methods for assembly of the powertrain.

Abstract: Microelectromechanical resonators that can be fabricated on a semiconductor die by processes normally used in fabricating microelectronics (e.g., CMOS) circuits are provided. The resonators comprises at least two vibratable members that are closely spaced relative to a wavelength associated with their vibrating frequency, and driven to vibrate one-half a vibration period out of phase with each other, i.e. to mirror each others motion. Driving the vibratable members as stated leads to destructive interference effects that suppress leakage of acoustic energy from the vibratable members into the die, and improve the Q-factor of the resonator. Vibratable members in the form of vibratable plates that are formed by deep anisotropic etching one or more trenches in the die are disclosed. Embodiments in which two sets of vibratable plates are spaced by ½ the aforementioned wavelength to further suppress acoustic energy leakage, and improve the Q-factor of the resonator are disclosed.

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: A magnetic motion transmission device (10) which comprises a magnetic body (15) which has an outer cylindrical surface and radial end walls, is polarized axially of the cylindrical surface and, at the opposed radial ends of the cylindrical surface, has a pair of disc-like pole plates (14, 16) that are of a like diameter greater than the diameter of the cylindrical surface. The pole plates (14, 16) are mounted axially at the opposed radial ends of the magnetic body by an axle pin (18) of non-magnetic material (e.g. brass). The device (10) serves in use to effect motion transmission between first and second members (11, 12), the second surface being either planar or cyclindrical or frusto-conical.

Abstract: A device for transmitting motion between the rotor of a synchronous permanent-magnet motor and the working part, having an increased free rotation angle, which comprises at least two motion transmission couplings which mutually cooperate in a kinematic series. Each coupling is constituted by at least one driving element which is eccentric with respect to the rotation axis and is rigidly coupled to a first component of the motion transmission system and by at least one driven element, which is also eccentric with respect to the rotation axis and is rigidly coupled to the component arranged kinematically after the preceding one. The angle covered by the elements of each coupling is, as a whole, less than a round angle. The intermediate components of the kinematic transmission have both a driven element and a driving element for receiving the motion from the preceding one and transmitting it to a subsequent one.

Abstract: The present invention relates to a bearing for an open-end spinning rotor. The latter is driven at its rotor shaft by means of a tangential belt in a predetermined direction and is supported in a nip which is formed by at least two bearing disks capable of being driven by the rotor shaft. A bearing disk (at least one) leads in relation to the drive direction of the tangential belt rotating into the nip, and another bearing disk (at least one) trails in relation to the drive direction of the tangential belt rotating out of the nip. The axis of the bearing disk (at least one) rotating into the nip is at a specified distance from the plane which goes through the rotor shafts of the spinning rotors of several adjoining open-end spinning devices. This distance is being smaller than the distance between the axis of the bearing disk (at least one) rotating out of the nip and the rotor shaft plane.

Abstract: A combined power driven device is made up of three layers, each of the three layers forming an electromechanical structure such as a stator or an armature. One of the three layers serves as a common magnetic structure for interaction with the electromechanical structures formed by the other two layers and the three layers may be mechanically coupled with each other, a load, and/or an active power source to provide either generator or motor functions, or a combination of generator and motor functions.

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: A drive arrangement for a motor vehicle includes an internal combustion engine with a crankshaft which is selectively connectable to an output drive shaft via an interposed clutch system. The clutch system has at least two flywheel masses which are rotatable relative to each other. A first flywheel mass comprises at least one primary flange which is permanently connected to the crankshaft. The clutch system also includes an electric machine which has a rotor with a rotor carrier, the electric machine being arranged in the clutch system so that the primary flange is part of the rotor carrier.

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: A motor/generator unit applicable to an automotive vehicle is disclosed. The motor/generator unit includes: a torque converter (102a) to perform a transmission of a driving force between an output axle of a vehicular engine and an input axle of a transmission, the transmission being enabled to switch between a neutral state and a forward-and-rearward state and being enabled to vary a gear ratio; a housing (5) enclosing a periphery of the torque converter; a hydraulic clutch; an electromagnetic clutch, both (102c) of the hydraulic clutch and electromagnetic clutch being juxtaposed to be enabled to form a lock-up state of the torque converter; and amotor/generator (102b) including a stator (1) fixed to the housing and a rotor (8) attached to a rotary element of the torque converter so as to be opposed to the stator, the motor/generator being disposed to be enabled to give and receive a torque to and from the rotary element of the torque converter.

Abstract: A crankshaft-mounted, multiple-speed electromagnetic clutch for driving multiple rotary devices of an engine, the engine having a crankshaft, the clutch comprising: a clutch support plate mounted to the crankshaft; a spring connected to the clutch support plate; a pair of clutch plates connected to the spring with the spring biasing the pair of clutch plates toward the clutch support plate; a pair of rotors rotating about the crankshaft on bearings; an electromagnet fixedly engaging each of the rotors and adapted to attract one of the clutch plates against the rotor, thereby transferring the rotational force of the crankshaft to the rotor; and a transmission device connecting each of the rotors to the rotary device.

Abstract: An electric machine which can be operated optionally as a motor or generator and in particular can be installed in the drive train of a motor vehicle with a hybrid drive. The machine includes a stator and a rotor of substantially cylindrical shape, The rotor is positioned about the stator to form a circumferential air gap between the stator and the rotor. An integrated switchable clutch is provided for the transmission of torque. The rotor is arranged on the outside (external-rotor machine) of the stator and the clutch is arranged within the stator.

Abstract: In the case of thermal power installations in which a gas turbine and a steam turbine jointly drive a turbo generator, the slip rings (8, 9) are arranged on a separate slip ring shaft (14) which is connected to the actual shaft or machine shaft (10) of the electric machine by means of a first detachable coupling (11). The slip ring shaft is provided on its end averted from the electric machine with a coupling flange (15) which is not connected to the slip ring shaft (14) by welding until after the slip rings (8, 9) have been pushed on.The use of an expensive shrink-on coupling between the turbo generator and steam turbine is avoided in this way without increasing the overall length of the turbo generator.

Abstract: A concentric-double-shaft simultaneously rotating apparatus in which a part of the force for driving an inner shaft to rotate is obtained by a device other than a rotation controlled motor to thereby reduce the capacity of the rotation controlled motor to attain reduction in size of the apparatus, increase of stiffness, and so on. The concentric-double-shaft simultaneously rotating apparatus includes at least one permanent magnet which is attached onto an inner circumferential surface of an outer shaft, and a secondary conductor such as a copper pipe, or the like, is provided on an outer circumferential surface of the inner shaft to create an induced current flow.

Abstract: Irregularities on the face of the pulley groove of the pulley for driving the rotor shaft of the generator through the one-way clutch are positively extended and a frictional force between the face and the belt is increased, so that a higher torque than the drag torque can be transmitted to the one-way clutch without causing a slippage of the belt. Since no slippage occurs on the belt, the belt life can be extended. Since the one way clutch is positively operated, the inertial energy of the rotor can be effectively recovered.

Abstract: An electromagnetic clutch of the type which includes a rotor secured around a rotation shaft, a drive member rotatably mounted around the rotation shaft, an armature mounted through a resilient member to the drive member with a gap to the rotor, a bearing mounted around the rotation shaft, a yoke mounted around the bearing for rotation about the rotation shaft, and the yoke locking mechanism for locking the yoke to a frame so as to prevent the yoke from accompanying the rotation shaft when the rotation shaft is rotated, the yoke having a coil wound therearound, and in which the rotor, the armature and the yoke are arranged to form a magnetic path so that the armature is electromagnetically attracted to the rotor for transmitting torque from the drive member to the rotation shaft when the coil is energized.

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: Quartz crystal vibrators of small size which vibrate in the shear mode consist essentially of a vibrating portion and a support portion, both of which lie in the same plane. As a consequence, they are readily manufactured on a production basis and can be shaped so as to minimize the effect of variation in ambient temperature.

Abstract: The faces of transducers for transmitting or receiving sonic signals have outwardly protruding conical shapes to reduce problems caused by reflections of the sonic signals.

Abstract: A device for converting electric into acoustic vibrations and vice versa, provided with a diaphragm, comprising at least one layer of a piezoelectric polymer material, which is polarized in a transverse direction and which at either side is provided with electrodes, the diaphragm being undulated in at least one orthogonal section, whilst each flank of the undulation is polarized in the same direction over its entire width and in the operating condition the direction of the applied electric field relative to the direction of polarization in adjoining flanks are alternately parallel and anti-parallel. Two types of embodiments are possible.

Abstract: A piezo-electric tuning fork oscillation circuit including a piezo-electric tuning fork and amplifier units, such as ordinary audio frequency signal amplifier circuits employing transistors, between which amplifier units, a phase correction circuit comprising resistance and capacitance is inserted. In the phase correction circuit, the oscillation frequency coincides with the center frequency of the tuning fork over a wide frequency range with phase shift angle of the correction circuit being adapted to increase as the frequency increases, for producing stable oscillating frequency with possible maximum oscillation output.

Abstract: A quartz crystal resonator is provided in which a simple rectangular quartz crystal is cut at the respective corners thereby to have a wedge shape in cross section at the respective corners, and the length and thickness of the quartz crystal resonator along the line connecting the centers of the respective opposite sides thereof are the same as those of the rectangular quartz crystal.

Abstract: In acoustic surface wave devices the bottom of the substrate is provided with a plurality of discrete recesses to attenuate and/or scatter bulk waves.

Abstract: Resonators adapted to be supported from a single support arm are made by a rocess wherein the resonator and its support arm are blanked in a single piece from a flat plate of piezoelectric material. The resonator electrodes are formed on the resonator and conductors formed on the support arm in a single metallization operation. If desired, the support arm may be left attached to the flat plate by a region of reduced cross section after the blanking step. The metallization step may include metallization of a portion of the flat plate to form a circuit over the conductor to the electrodes. The resonator may then be vibrated and tested while its support arm is still attached to the flat plate by applying an electrical potential to the metallized portion of the plate. After testing, the resonator support arm may be broken away from the flat plate at the region of reduced cross section. Several resonators may be made simultaneously by the process from a single flat plate of piezoelectric material.

Abstract: An electro-acoustic transducer with a piezoelectric diaphragm supported by a support member having a curved portion for imparting a suitable resiliency and/or tension to said diaphragm to improve acoustic characteristics without reducing efficiency of the electro-mechanical conversion effected by the transducer.

Abstract: A method for stabilizing the vibration frequency of an oscillator which contains a tuning fork-type quartz crystal element comprising a pair of arms each having a given size and a common connecting section connecting the mutually facing ends of the paired arms.

Abstract: At least three pairs of opposing electrodes on the two major faces of a poelectric or electrostrictive transducer element having a gap which is adapted to change in response to selected control voltages applied across the three pairs of electrodes. The pairs of electrodes are electrically insulated from one another and one pair of electrodes covers substantially one half of the major faces across from the gap, while the other two pairs of electrodes are disposed on the major faces of the transducer adjacent the gap and respectively covering substantially quarter sector portions of the transducer surface. By the mechanical bonding of electrical switch contacts for example to the opposing end faces at the gap, switch actuation is provided by the application of control voltages across all three pairs of electrodes, causing the gap to diminish and thereafter shorting the pairs of electrodes or applying a reverse control voltage to widen the gap.

Abstract: A multiaxis transducer including a spherical conductive core, surrounded by pair of piezoelectric hemispheres which are insulated from one another except at contact with the core. The piezoelectric hemispheres are surrounded by a pair of conductive hemispheres which are insulated from each other and are positioned to compress the piezoelectric hemispheres between the conductive hemispheres and the core so as to permit generation of electrical signals by the piezoelectric material through either compression or release of compression. Also included are means for receiving electrical signals generated by the piezoelectric hemispheres during application of acceleration force towards one of the conductive hemispheres.

Abstract: A cutterhead assembly suitable for forming a topographic signal-representative pattern in a recording medium such as a disc is constructed with non-parallel external surfaces so as to provide a response relatively free of undesired resonant modes over a relatively wide frequency range. The cutterhead includes a cutting stylus supported in a stylus mount. The stylus mount and therefore the stylus are driven by a piezoelectric element which is mounted on a supporting pedestal. A resilient mounting means is utilized to fasten the supporting pedestal to a mounting bracket.

Abstract: A device for transmitting motion between the rotor of a synchronous permanent-magnet motor and the working part, having an increased free rotation angle, which comprises at least two motion transmission couplings which mutually cooperate in a kinematic series. Each coupling is constituted by at least one driving element which is eccentric with respect to the rotation axis and is rigidly coupled to a first component of the motion transmission system and by at least one driven element, which is also eccentric with respect to the rotation axis and is rigidly coupled to the component arranged kinematically after the preceding one. The angle covered by the elements of each coupling is, as a whole, less than a round angle. The intermediate components of the kinematic transmission have both a driven element and a driving element for receiving the motion from the preceding one and transmitting it to a subsequent one.