Abstract: At temperatures located in a cryogenic temperature range, nickel steel is used for components, which can be subjected to high levels of mechanical stress and which have ferromagnetic properties at these temperatures.

Abstract: A three phase linear motor system includes a forcer having three pole pairs, which are moveable relative to a platen. The pole pairs are arranged to oppose associated teeth of the platen. The platen teeth are spaced apart from each other in a travel direction according to a predefined tooth pitch. Each of the pole pairs includes a set of teeth that extend from magnetically coupled poles toward the platen. The set of teeth of one of the pole pairs is spaced from the sets of teeth for the other two poles by distances functionally related to about 120 degrees and 240 degrees, respectively, of the tooth pitch.

Abstract: An electric motor assembly is provided that includes a housing. A rotor is arranged in the housing and is rotatable about an axis. A vehicle wheel is coupled to the rotor. The rotor has an annular profile defining sinusoidal teeth and is generally concentric with the axis. The angle and number of oblique surfaces of the teeth and the diameter of the rotor, in part, define the speed and torque of the rotor. A plurality of electric linear actuators are arranged circumferentially about and generally parallel to the axis. The actuator includes shafts having ends that engage the profile. The shafts are movable between extended and retracted positions to rotate the rotor in a desired direction. A sensor detecting the position of the rotor and a controller may be used to effect the desired rotation.

Abstract: A moving-magnet, linear motor which substantially produces no cogging force is provided. The moving-magnet, linear motor has a mover and a stator. The mover has a plurality of permanent magnets orderly disposed along the traveling direction of the mover. The stator has a toothed iron-core having a plurality of teeth and a plurality of coils wound around the teeth thereof. The permanent magnets are disposed such that the two longitudinal ends of each permanent magnet are skewed with respect to each other by a tooth pitch of the toothed iron-core.

Abstract: Disclosed is a linear actuator in which a screw shaft portion is integrally formed on the distal end side of the rotation shaft of the motor, and in which the coupling and one of the support bases are eliminated, thereby achieving a reduction in the number of parts and an improvement in positioning accuracy. The linear actuator includes a screw shaft portion formed on the distal end side of the rotation shaft of a motor and a nut portion threadedly engaged with the screw shaft portion, in which the screw shaft portion and the rotation shaft are formed as an integral unit using the same material and in a seamless state.

Abstract: An electrodynamic direct linear drive (1) has a coil system (2) with a plurality of coaxially sequentially following drive coils (3). In the interior or on the external periphery of the coil system (2) a magnet system (6) is arranged, which is designed in the form of a component of an output part (8) able to be moved in relation to the coil system (2). On the opposite side of the magnet system (6) a return circuit means (15) is arranged internally or externally of the coil system (2). In order to achieve a high energy density axially adjacent drive coils (3) contact each other directly. Furthermore a method for the production of the coil system (2) is provided.

Abstract: A linear voice coil actuator is disclosed which includes field subassemblies each including a field blank, and in which at least a one of the field subassemblies includes magnets of alternating polarity positioned on the field blank to form interleaved-magnetic circuits in a direction of motion of the linear voice coil actuator. The field subassemblies are positioned with respect to one another to form a gap between the field subassembly having the magnets, and another of the field subassemblies. Also included is a coil assembly that includes coils positioned in a plane within the gap, wherein the plane is substantially parallel to the direction of motion of the linear voice coil actuator.

Abstract: A high efficiency electric motor has a generally polyhedrally shaped bulk amorphous metal magnetic component in which a plurality of layers of amorphous metal strips are laminated together adhesively to form a generally three-dimensional part having the shape of a polyhedron. The bulk amorphous metal magnetic component may include an arcuate surface, and preferably includes two arcuate surfaces that are disposed opposite to each other. The magnetic component is operable at frequencies ranging from about 50 Hz to about 20,000 Hz. When the motor is operated at an excitation frequency “f” to a peak induction level Bmax, the component exhibits a core-loss less than about “L” wherein L is given by the formula L=0.005 f (Bmax)1.5+0.000012 f1.5 (Bmax)1.6, said core loss, said excitation frequency and said peak induction level being measured in watts per kilogram, hertz, and teslas, respectively.

Abstract: A path for a linear motor system includes routing system between a trunk of the path and two or more branches. The routing system is operative to couple the trunk with a selected branch to enable a stage to travel between the trunk and the selected branch. The routing system includes armature windings that may be energized to effect movement of the stage in a desired direction between the trunk and the selected branch.

Abstract: A compact and simple linear actuator includes a spindle to a main body so as to be capable of moving in an axial direction, displacement detection device, a motor, and a transmission mechanism. The displacement detection device detects a movement displacement amount of the spindle. The motor is disposed adjacent a proximal end one of the spindle and on the same axis as the spindle. The transmission mechanism transmits turning force of the motor to the spindle. The transmission mechanism includes a first rotary member fitted to the proximal end of the spindle and integrally rotating with the spindle, a second rotary member fitted to a rotor of the motor, and connection rods for transmitting rotation of the second rotary member to the first rotary member. The connection rods have axes that are parallel to an axis of the spindle while being displaced from the spindle axis.

Abstract: A power tool has a motor with end caps secured by cold forming to the motor. The end caps include bearings retained in the end cap by deformation of the end cap. The motor includes an armature shaft which is staked to retain laminates as well as a retainer on the shaft. Also, a pinion gear with a shoulder which limits movement of the shaft in the motor. A fan is on the motor armature which is secured by an adhesive which changes color during assembly. The motor also includes a demagnetization member which increases resistance to demagnetization due to elevated temperature, as well as armature reaction field.

Abstract: A lift/swivel drive comprising a working element which can traverse rotationally and linearly in relation to a housing element. In order to displace the working element in a controllable linear and rotative manner in relation to the housing element, at least one linear motor and at least one rotative motor are assigned to the working element and/or the housing element.

Abstract: A vibrating linear actuator includes a mover having a permanent magnet, a stator having coils, a base on which the stator is mounted, a cover, and lands electrically coupled to the coils. The lands are provided on the surface of one of the base or the cover.

Abstract: Methods and apparatus are provided for initializing a planar motor. A magnet array floating above a coil array may reside in one of a definite number of positions upon the introduction of current into the coil array. Torque characteristics of the magnet array are acquired when driving the magnet array with no phase offsets. Phase offsets for driving the magnet array with substantially no yaw can then be determined by analyzing the torque characteristics.

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 high-thrust linear motor having coils wound with a minimal blank space in slots of a magnetic member (core) to generate high thrust and permit smooth movement of a moving member. The high-thrust linear motor includes a magnetic member having a plurality of slots formed in series in an axial direction thereof. The slots extend from both sides of the magnetic member in opposite directions intersecting the axial direction in corresponding relation to each other. Coils having a plurality of phases are wound in respective pairs of slots on both sides of the magnetic member. Field magnets extend in the axial direction at both sides of the magnetic member so as to face an effective conductor portion of each coil. Each field magnet has a plurality of pairs of magnetic poles magnetized in the axial direction. According to a method of producing the high-thrust linear motor, coils are wound in respective pairs of slots on both sides of the magnetic member while the magnetic member is being rotated.

Abstract: A rotary electrical machine (1) has at least one stator (23). The stator is provided with at least one radial channel (107) for ducting cooling air. The channel (107) extends between a first position (113) at or substantially near the rim (109) of a winding region of the stator (23) and a second position (119) at or substantially near the center (51) of the winding region. The machine (1) has cooling means (91-97) for causing cooling air to enter the radial channel (107) via the second position (119) and exit via the first position (113). The stator may have electrical windings arranged as coil sectors (183-197) disposed substantially equi-angularly in a generally circular pattern. At least some of the coil sectors are wound in a generally spiral fashion when viewed axially. A rotor (13), for the machine may have a plurality of equi-angularly spaced magnets (127), which are generally circular but with a cut-away portion, when viewed axially.

Abstract: A controlling apparatus for controlling a linear oscillation motor includes a sensor and a controller. The motor has a movable element and a stator one of which includes an electromagnet with a winding. The sensor is configured to detect movement of the movable element. The controller is configured to intermittently supply electric power to the winding of the electromagnet to move the movable element reciprocally and linearly. The controller is configured to begin each intermittent supply of electric power to the winding at a timing before a dead center of the movable element based on an output of the sensor.

Abstract: The present invention provides an electromagnetic drive motor assembly (EDMA) that has an inner flux return assembly formed from an upper pole piece and a lower pole piece oppositely disposed relative to each other along the center of the EDMA. An annularly positioned conductive ring (or flux stabilization ring) encircles the inner flux return assembly, concentrically in contact with the outside of the inner flux return assembly. Along the exterior side of the flux return pieces, is a magnet that is between a top plate and a bottom plate. Each plate contacts with the magnet to form a magnetically conductive system. A magnetic gap is formed in between the inner flux return assembly and the top and bottom plates. Disposed within the magnetic gap is a dual coil wound around a cylinder. The dual coil includes a first coil portion and a second coil portion. To minimize the modulation, the top and bottom plates may be saturated and plate tips may be provided near the magnetic gap.

Abstract: A rocking seat control apparatus for a moveable seat supported and having a magnetic member attached thereto is provided that is capable of maintaining the seat being rocked constant in rocking amplitude. The apparatus includes a solenoid for bi-directionally attracting the magnetic member to cause the seat to move in a positive and a negative direction alternately and thereby to be rocked; an amplitude measuring means for measuring an amplitude of the seat being rocked and a rocking motion of the seat; an amplitude damping factor measuring means responsive to displacements in the positive and negative directions of the seat being rocked for measuring an extent of damping factor of the amplitude caused while the seat is being rocked; and a solenoid energizing means for energizing the solenoid means during a time period in which the seat is being rock traveling a distance that is a product of the measured rocking swing and the measured extent of damping factor of amplitude.