Abstract: A brush holder for dynamo-electric machine has the following parts: a brush making sliding contact with the surface of a rotary collector; a stationary holder part fixed to the stationary part of the dynamo-electric machine opposite to the collector; and a detachable holder part detachably secured to the stationary holder part and holding the brush when separated from the stationary holder part, the detachable holder part being provided with a retainer that clamps the brush when the detachable holder part is separated from the stationary holder part and unclamps the brush when it is attached to the stationary holder part, the brush clamping portion and the portion of the retainer therearound being coated with a coating film of a material having a friction coefficient smaller than the material of the retainer. This arrangement obviates various unfavorable phenomena such as jumping of the brush, sparking on the sliding surface, cracking in the brush and so forth.

Abstract: Submersible electric motors for pumping fluid from wells are assembled together in tandem relationship for increasing total output horsepower. Means are provided to make electrical connections just prior to assembly and interconnect the oil flow corridors between motors during assembly. Precompressed spring-loaded thrust bearings compensate for shaft length changes and dampen vibrations. The oil circulation corridors include filtration.

Abstract: A laminated magnetic circuit stator with clamping fingers for a rotating electrodynamic machine, notably of the immersed bulb type. The force clamping the sheets (T1, T4) of the stator magnetic circuit is transmitted to clamping fingers (1) by radial levers (2) bearing on the shell (10) and subject, further from the stator axis, to a longitudinal thrust transmitted by bars (4) bearing on the shell beyond the heads (16) of the stator winding bars.

Abstract: An acoustic surface wave transducer with a transmission interdigital electrode (2A) and a reception interdigital electrode (2B in FIG. 10A-D) on a piezoelectric surface (1) has been improved by reducing inband dispersion of frequency characteristics by providing an edge effect canceler (k.sub.1), which cancels an undesired surface wave (E-a, E-b) generated at the external edge of the extreme end finger of the interdigital electrodes. Said edge effect canceler is constructed so that the length of the extreme end finger (11a) of the interdigital electrode (10, 20 in FIG.5A) is half of the length of the second extreme end finger (12a) of said interdigital electrode, and the spacing between said extreme end finger and the second extreme end finger is 1/2 wavelength of the acoustic surface Wave.

Abstract: To enable increased power coupling into a SAW device for which voltage breakdown is a limiting factor in determining the maximum power which can be coupled, each transducer of the SAW device is replaced by a plurality of series-connected inter-digital transducers (IDTs). For operation in an Nth harmonic mode, there may be N series-connected IDTs which are offset from one another by 1/N wavelengths of the fundamental frequency for which the individual IDTs are designed; for high frequency SAW devices, this further increases the power which can be coupled into the device. The SAW device is particularly useful in a delay-line oscillator to constitute a microwave source for a local oscillator in a radio repeater.

Abstract: A direct current motor comprising a field magnet provided with 2n magnetic poles which are magnetized with the same angular intervals as those of the magnetic poles N and S, where n is an integer of 1 or more; a magnetic member for closing the magnetic circuit of the magnetic poles of the field magnet; a plurality of armature coils in such a manner that the angular intervals of the electrically conductive portions thereof, contributing to the generation of torque in the armature coils, are substantially equal to the magnetic pole width of the field magnet; electric power supply control device to which the terminals of the armature coils are connected; short-circuit members for short-circuiting the winding initiation terminals of predetermined armature coils and the winding end terminals of other predetermined armature coils through the electric power supply control device; an armature comprising armature coils in the first series and armature coils in the second series through which the short-circuit members

Abstract: For the purpose of converting the mechanical energy of surface waves on bodies of water, a power generating piezoelectric structure (10) is provided comprising piezoelectric material members, preferably in the form of one or a laminate of sheets (14) of such material, each sheet having an electrode (24) on opposite surfaces thereof. Each pair of electrodes and the piezoelectric material therebetween define a power generating element, each of which is preferably dimensioned, relative to the wave lengths of selected waves on the body of water in which the generator is to be used, for increasing the efficiency of power conversion. A support means (12) is provided for maintaining the structure in a preselected position within and below the surface of the water. Preferably, the piezoelectric generating elements are flexible and are supported in such manner to allow flexure thereof in response to movement of the surrounding water.

Abstract: A method is provided to connect individual conductive traces to an array of individual piezoelectric elements by bonding a flexible circuit board containing conductive traces to the piezoelectric elements. The resultant bonded elements provide an array for an acoustic transducer.

Abstract: A circuit arrangement for a piezoelectric positioning element is formed of a series connection of a capacitive element, an inductance, and first switch to be controlled, said series circuit being connected across at least one piezoelectric body of the positioning element. The capacitive element, which may be another piezoelectric body of the same positioning element but which is operated in reverse phase, has at least approximately the same capacitance value as a capacitance of the first piezo-electrical body. The inductance is dimensioned sufficiently large in order to magnetically intermediately store substantially an entire energy increment to be transferred between the positioning element and the capacitive element. The first switch is connected to permit termination of a charge transfer. A series circuit is formed of an electrical energy source for charging and recharging and a second switch, said series circuit being connected parallel to the positioning element or the capacitive element.

Abstract: The invention is an improved manufacturing technique for producing a certain class of Surface Acoustic Wave (SAW) devices, namely those having input and output transducers in close proximity. A much higher manufacturing yield results from eliminating the cutting of a slot in the substrate between input and output transducers as formerly done. This frequently destructive step is replaced by ion-milling of a deep groove between the ports and backfilling with a metal of proper configuration to provide electromagnetic shielding. The technique produces a new device that is at least equal to the prior art in rejection of unwanted couplings between input and output.

Abstract: An ultrasonic transducer providing a plurality of different focal lengths within a unitary structure and comprising a piezoelectric element having a cylindrical spiral surface with respective sections of the spiral surface providing respective different focal lengths. Each section of the spiral surface can include electrodes in the form of a Fresnel zone pattern to provide focusing in the orthogonal dimension to the spiral axis.

Abstract: A rotor core of an electric rotary machine is provided with a number of slots opening toward the outer peripheral surface of the core and teeth formed between the slots. At the sides of the rotor core are mounted spidery end plates having notches opposing the slots and projections opposing the teeth. That end surface of the projection which is remote from the rotor core is formed to extend farther from the end surface of the rotor core as it becomes distant from the axis of the rotor core. The rotor winding is wound about the rotor core and spidery end plates to be buried in the slots and notches, the bottom of the notch being higher than the laminate slot, so that the slot liner is not distorted during winding operations.

Abstract: A rotor for a D.C. electric motor is disclosed, in which the rotor has a frontally arranged collector on which brushes are active, which are oriented parallel to the rotor axis. This arrangement considerably reduces the diametrical bulk of the motor. The brush angle is adjustable by means of an annular ring, internally threaded to the yoke.

Abstract: Fail safe electromagnetic clutch (10) includes a driving member (12) and a driven member (16). Engagement structure (30) cushions engagement between the driving member (12) and driven member (16) when the clutch is engaged. The engagement structure (30) includes a pair of elements (36, 34) and a resilient wave washer (42) located therebetween. The waver washer (42) biases the element (36) into driving engagement with the driving member (12) and biases the element (34) into driving engagement with the driven member (16). When the clutch is disengaged, a magnetic coil (22) forces the element (34) away from the driven member (16), thereby collapsing the wave washer (42). When the clutch is to be re-engaged, the coil (22) is de-energized, thereby permitting the wave washer (42) to drive the element (34) back into driving engagement with the driven member (16).

Abstract: The electric actuator comprises a deep cup harmonic drive gear train member with an electric motor, brake, tachometer, and resolver disposed therein. The arrangement and coupling of the components provides a high torque-to-weight ratio actuator that is capable of more than 360.degree. rotation.

Abstract: A magnetic drive assembly includes a housing having a pair of end flanges, an annular drive member containing a plurality of drive members and internally thereof a driven member containing a plurality of driven magnets. The drive and driven members are bearingly supported by the end flanges so that rotation of the drive member results, through magnetic interaction, on rotation of the driven member. A barrier separates the driven and drive members and extends between the end flanges to hermetically seal the driven member. The barrier is formed from a plurality of abutting axially adjacent annular laminations held in axial compression by the end flanges, the laminations being formed of a non-magnetic material. In one embodiment the laminations have a chevron shape in radial cross-section whereby adjacent laminations are nestable with each other.

Abstract: An ultrasonic transducer element includes a polymer piezoelectric film having a plurality of sections. The sections are defined by wave planes of ultrasonic waves having substantially .lambda./2 phase difference emanated from an imaginary focal point or line located in front of the piezoelectric film. .lambda. is the wave length of the ultrasonic waves within an acoustic transmission medium located between the piezoelectric film and the imaginary focal point or line. The sections are arranged so that ultrasonic waves emanated from adjacent sections have substantially no phase difference at the imaginary focal point or line. Front and rear electrodes are deposited on opposite surfaces of the piezoelectric film.

Abstract: An electromagnetic diaphragm disk actuator is both easily driven and posiely held in its desired controllable relationship. The actuator includes a stator having a driving rim with a driving tooth system, a holding rim spaced axially away from the stator with a holding tooth system, a plurality of pairs of electromagnets in the stator and a rotor connected to a drive shaft having a magnetically attractable diaphragm with cooperating driving and holding tooth systems positioned around the circumferential edge and on opposite sides thereof lying between the stator and the holding rim. The diaphragm is positioned between the driving rim and holding rim such that the engagement points of the driving and holding tooth systems deform the diaphragm to the point that it develops an apex generally defined by the axis between the points of engagement of the holding tooth system and such axis is displaced 90.degree. relative to the axis formed by the engagement points of the driving tooth systems.

Abstract: An electromagnetic clutch includes a mechanism which is responsive to a first short energization of an electromagnet thereof to cause a spring arrangement therein to snap to a reverse configuration wherein it holds the clutch engaged until a second short energization with a current larger than that used for the first energization, whereupon the mechanism again reverses the configuration of the spring and subsequently causes the clutch to disengage.

Abstract: A device is disclosed for neutralizing static charge generated in a moving web of dielectric material. A conductive bare wire is impressed with an AC voltage of 3000 to 10,000 volts at a frequency of 40-70 Hertz and located near the web.