Abstract: An apparatus for controlling the motion of a structural member on a space platform truss structure, launch vehicle, automobile, building, or the like is comprised of a first driving piezoelectric element and a second constraining piezoelectric element. The first piezoelectric element is embedded in or bonded onto the structural member. The second piezoelectric element is bonded onto the structural member, with a viscoelastic material (VEM) layer sandwiched between the structural member and the second piezoelectric element. The first and second piezoelectric elements are electrically connected in opposite phase. When the structural member is deformed by an applied force, the first driving piezoelectric element is correspondingly deformed, generating an electrical field. The electrical field is then applied in an opposite sense to the second piezoelectric element through the electrical connections, thereby oppositely deforming the second piezoelectric element with respect to the first piezoelectric element.

Abstract: An electromagnetic interference suppressing (EMI) interconnect for connecting a DC motor to a DC source comprising a pair of copper sheets disposed between insulative sheets, and wrapped around the motor housing. A lead extends from each copper sheet for being connected to one side of the DC source. A connector tab extends from each copper sheet for being connected to one terminal of the DC motor. The copper sheets may be spaced laterally apart and disposed between a single pair of insulative sheets, or may be overlayed and separated by an insulative sheet. EMI suppression provided is greater than that possible with known capacitance devices of similar capacitance values.

Abstract: A motor includes a permanent magnet rotor having opposed magnetic poles supported for rotation about an axis. A stator surrounds the rotor and consists of conductors extending parallel and uniformly around the rotor axis, in order to provide a uniform current sheet and a constant force per unit current acting on the rotor.

Abstract: In summary, the present invention is a flexible printed circuit that eliminates the need for lead wire routing. The flexible printed circuit of the present invention comprises a plurality of electrical paths surrounded by a sheath of pliable MYLAR (polyester film) plastic. One side of the plastic is an adhesive that holds the circuit in place after it is wrapped around the shaft of the motor. On the other side, the mylar sheath opens to expose the ends of each electrical path. Small amounts of solder are pre-deposited at these exposed ends. A probe, suitably heated and applied to these ends, releases the solder to form a electrical and physical contact.

Abstract: A superconduction bearing is provided in which the load capacity and rigidity of a rotary member are improved, run-out of the rotary member is prevented to support the rotary member in a stable, non-contacting manner, and manufacturing cost is reduced. The superconduction bearing includes a rotary member and a disk formed on the rotary member. The disk has permanent magnets provided thereon. The permanent magnets are magnetized to have opposite poles on top and bottom sides thereof. A permanent magnet section is thus formed by the disk and the permanent magnets. Superconductors are concentrically provided for rotatably supporting the rotary member. The permanent magnet section and the superconductor section are positioned opposite to each other. The width and thickness of the permanent magnets are set to 5 to 10 times the distance between the permanent magnet section and the superconductor section.

Abstract: A return plate for the voice coil motor of a disk drive is disclosed, wherein the angular positions of the top and bottom plates of the return plate are aligned by employing slot shaped voids and anchoring features. The bottom plate is anchored by a tight tolerance coupling to an actuator mounting boss in the base plate of the disk drive. The angular position of the bottom plate is controlled by a slot shaped hole that couples with a tight tolerance in a narrow dimension to an alignment boss in the base plate. The top plate is anchored to the base plate, and the angular position of the top plate is controlled by a slot shaped standoff that couples with a tight tolerance in a narrow dimension to the alignment boss.

Abstract: The entropic echinoid 2 applies force to an object 6 with the cummulative effect of myriad feet 8 activated by fluid expansion pulses from electrical resistance heaters 30. Each heater lying in a fluid filed socket 10 of a substrate 4 and activated by a signal from a corresponding foot position sensing capacitor 26. The entropic echinoid is useful in high temperature environments for motors, actuators, bearings and clutches.

Abstract: An electrical motor includes a ground brush connected to ground, first and second supply brushes connected to first and second supply lines and adapted to cause the motor to rotate at first and second speeds, and an interference suppression device comprising a common core, a first coil connected in series between the first supply brush and the first supply line and a second coil connected in series between the second supply brush and the second supply line. The space required by the device in the motor casing is less than with the conventional arrangement of two individual chokes and can provide improved noise suppression due to magnetic coupling between the two coils.

Abstract: An armature for a fractional horsepower motor is provided with spiders 10A having spokes 20 and arms 24. The spiders 10A fit at at least an end of laminated armature stacks around which the armature windings are wrapped. The spokes 20 are profiled to provide upstanding rounded surfaces 23 for the windings and to reduce drag. Reduction in drag and the profiled shape of the spokes 20 improves air flow through the motor and reduces the tendency of build up of carbon dust in the region of the extremities A of arm of the laminated stack as well as reduce motor noise in use.

Abstract: A miniature motor comprising a rotor having a plurality of axially extending magnetic poles disposed on the outer periphery thereof in the circumferential direction, and a stator having two axially disposed coils wound on coil bobbins, in which flanges whose outside diameter is larger than the outside diameter of hollow cylindrical coil cores are provided on both ends in the axial direction of the coil cores, the coil bobbins having on one of the flanges projections protruding toward the outside in the axial direction of the coil cores are disposed in such a manner that the projections are directed toward each other, and that the projection on one coil bobbin faces the coil core of the other coil bobbin.

Abstract: The invention relates to a monophase electromagnetic actuator which includes a rotor (1) with a cylindrical magnetized section (5) divided into two N poles transversely magnetized in alternate directions. The actuator also includes a stator structure consisting of a first magnetic circuit (2) and a second magnetic circuit (3), which are joined only by non-magnetic linking parts. Application: miniature actuators for precision and instrumentation work.

Abstract: The stator of the alternator has a delta winding with each winding having twelve coils. Three diode bridges are provided with each bridge being connected to the junction of two of the windings. Each bridge has four positive diodes connected in parallel and four negative diodes connected in parallel. Two of the positive diodes of each bridge and two of the negative diodes of each bridge are connected to a first output member and the other two positive diodes and the other two negative diodes of each bridge are connected to a second output member. Two heat sink plates are connected to the inside of one wall of the alternator housing and a third heat sink plate is connected to the outside of the wall. Each plate supports diodes from three of the bridges.

Abstract: A permanent magnet motor or actuator, such as the voice coil motors used in disk drives to position read/write heads, with an armature to magnet interface or junction modified to expand the magnetic material into regions of the armature that carry less than the maximum possible magnetic flux so as to have increased flux strength without inducing leakage of the flux out of the armature. Reduced flux regions include outside corners of the armature, places where the flux divides into two paths, and parts of the armature that have comparatively longer flux lines.

Abstract: A magnetic bearing is provided which may be utilized in a fine position control or movement system. Stability is enhanced by providing separate mechanisms for supporting the weight of a platen or other object being controlled with electromagnets utilized to control or compensate for motion of the platen in N degrees of freedom. The support mechanism is preferably one or more permanent magnets having an air gap with the platen which is greater than the air gap for the electromagnets. The mechanisms for supporting the weight of the platen may be made adjustable so as to support the weight of the platen regardless of any changes in such weight by, for example, adjusting the air gap for the permanent magnet to compensate for weight changes. Resonant vibration is reduced by constructing the platen of a hollowed, cellular structure, for example, a honeycomb structure.

Abstract: An electric motor and motor cradle apparatus for holding the motor. The electric motor includes opposed slots on opposite surfaces thereof. The opposed slots are engaged by opposed ribs in the cradle assembly to hold the motor. The ribs may be coplanar and mutually abutting. In some forms of the invention the apparatus also include additional pairs of coplanar abutting ribs that are dimensioned and configured to engage the motor at surfaces spaced from the slot.

Abstract: A short-circuiting and brush-lifting device comprises a rotatable actuating ring having with brush-actuating rods levers cause the brushes of the motor to lift up via the rotating actuating after the slip rings have been short-circuited as a result of the axial displacement of a short-circuiting ring. To make the device wear-resistant and insensitive to contamination, the actuating ring supports three rollers, with which it abuts in the starting position on the spring-loaded short-circuiting ring. The actuating ring is guided exactly in parallel by three axial guide rods, which are disposed perpendicularly to the brush-actuating rods. The configuration of all articulated joints of these rods is adjusted so as to allow the points of maximum excursion of the deflection of the articulated joint of the axial guide rods and the brush-actuating rods are exhibited at staggered times.

Abstract: A rotary actuator for setting the rotation angle of control elements, especially of a throttle device which determines the flow cross-section in a line through which flow passes, for internal-combustion engines, having an electric actuating motor with a two-pole stator, stator winding and two-pole permanent-magnet rotor. In order to achieve a compact construction and manufacture which is easy in production-engineering terms, the stator poles are constructed as claw poles which are connected on opposite end sides in each case to an annular jacket for the magnetic return path, which jacket surrounds the claw poles with a radial gap. The stator winding is located as an annular coil in the annular space between the annular jacket and the claw poles.

Abstract: The apparatus for feeding fuel to a motor vehicle engine from a fuel tank includes a pump portion and a direct current drive motor located in a housing part and through which the fuel flows. The commutator device of the drive motor includes commutator brushes located on the positive side and on the negative side; brush contact springs made from electrically conductive material located on the positive side and on the negative side, and a collector having a sliding surface for the brushes which are pressed on it during operation by the contact springs. To improve reliability of operation of the apparatus a negative potential is applied to the brush contact springs on the positive side and on the negative side and the brush contact springs on the positive side are electrically insulated from the commutator brushes on the positive side.

Abstract: The dynamoelectric machine has endwindings 24 including a plurality of superposed conductor bars 22 and adjacent end turns 20. Rabbets 32 are formed along the undersides of the adjoining conductor bars and end turns to receive gussets 30 for reinforcing the joints therebetween. One or more of the conductor bars and end turns have cooling passages 36, 38 with ports 40, 42 opening to one side of the joint at locations short of the joint. A cooling block 48 is disposed on one side of the joint extending between the superposed conductor bars and superposed adjacent end turns and spaced from the joint to define a chamber 60 in communication through the ports with the passages for passing cooling gas therethrough in heat exchange relation to the joint assembly.

Abstract: The structure for a motor having a rotor (R) and a stator (S) comprises a support hub (10) with branches (11), a sleeve (12) and if desired a cover (13), a mandrel (20) with a tube (21) and a radially inwardly-extending flange (22), and a connector (30) in the shape of a frustoconical ring (31). Application in automatically manufactured motors for the equipment of motor vehicles.