Abstract:
In a unipolar transverse flux machine, to achieve a modular construction, which is favorable from a production standpoint, the stator (11) and the rotor (12) have an equal number of identical stator modules (14) and rotor modules (15); the rotor modules (15) are firmly seated, in alignment with one another, on the rotor shaft (13), and the stator modules (14) are rotated by a rotational angle from one another in the housing (10). When there are two stator modules (14), the rotational angle is 90° electrically, and when there are m stator modules (14), the rotational angle is 360°/m electrically, where m is an integer and is greater than 2. Each stator module (14) has an annular coil (23), disposed coaxially to the rotor axis (19), and U-shaped stator yokes (24) that fit over the annular coil, along with short-circuit elements (25) disposed between the stator yokes. Each rotor module (15) comprises two rotor rings (16, 17) with teeth on the outside, and between them a permanent-magnet ring (18), magnetized unipolarly in the direction of the rotor axis (19).
Abstract:
Disclosed is a transverse flux linear motor with permanent magnet excitation, which has a simple configuration as compared to systems using hydraulic or pneumatic pressure, or a rotary motor and a power transmission device, while being capable of generating high force, thereby achieving a high efficiency, as compared to conventional linear motors. The transverse flux linear motor includes a stator including stator cores and windings respectively wound around the stator cores and supplied with current, and a mover arranged at a central portion of the stator, the mover including mover cores and permanent magnets. Each of the permanent magnets is arranged between adjacent ones of the mover cores. Each stator core has a pair of column portions spaced apart from each other by a desired distance. The windings are arranged in pairs such that each of the winding pairs has two windings wound around respective column portions of an associated one of the stator cores. The two-phase transverse flux linear motor with permanent magnet excitation has two of a single phase motor units, that is, an A-phase motor unit and a B-phase motor unit, are arranged to face each other. A non-magnetic element for phase isolation is centrally arranged to prevent each of the A and B-phase motor units from being influenced by the magnetic circuit of the other. The stators of the A and B-phase motor units are arranged such that they are shifted from each other by nullnull nullpnull, in order to reduce pulsations of thrust forces generated in the motor.
Abstract:
A claw pole dynamo includes an annular member having a magnet extending in a circumferential direction thereof for rotation around an axis; a first stator yoke having a first annular portion and a plurality of first pole shoes extending in a direction of the axis and in close proximity to the magnet, wherein the first annular portion defines a plurality of first discontinuities (such as slots) in a circumferential direction thereof for suppressing eddy currents in the first annular portion; a second stator yoke having a second annular portion and a plurality of second pole shoes extending in the direction of the axis and in close proximity to the magnet, wherein the plurality of first pole shoes are interleaved with the plurality of second pole shoes in the circumferential directions of the first and second annular portions; a core yoke for magnetically coupling the first stator yoke and the second stator yoke and for transmitting a magnetic flux in the direction of the axis; and a coil disposed around the core yoke. The plurality of discontinuities suppress the eddy currents in the first stator yoke. If desired, the second stator yoke could have a similar plurality of discontinuities in the second annular portion thereof to suppress eddy currents in the second annular portion. A first separation member with a plurality of discontinuities may be disposed between the first stator yoke and the core yoke to further suppress eddy currents, and the core yoke may include a plurality of sections disposed at different positions in a circumferential direction of the core yoke to further reduce eddy currents.
Abstract:
A high speed non-contact beam scanning device sized and shaped to provide the ergonomic benefits of a pen or wand, yet can scan a wide angle moving beam across an information-bearing target in one or two dimensional scan patterns such as lines, rasters or other patterns in order to read information therefrom. The device is well suited for reading one or two dimensional bar-code or other printed matter. In order to achieve the high density optical packaging necessary for its high performance to size benefits the device employs a novel in-line or “axial” gyrating, or “axial” scan element. The axial scan element can accept an input light beam at one end and cause it to emerge from its opposite end as a scanned beam, propagating in the same general forward direction it had upon entering the element. Reflected light, which carries information contained on the target, is collected by an internal non-imaging light collector and is processed by signal processing electronics. All components are integrated into a thin low mass module small enough to fit in a pen. Communication from the device is achievable by a cable or by wireless means.
Abstract:
A device for providing angular displacement of an axis in a direction selected from the X or Y direction or rotational movement about the Z direction with respect to the axis. The device comprises a magnetic core element which produces a magnetic field and defines a Z axis. The core element is capable of displacement in the X and Y directions respectively, and also rotational movement about the Z axis. A coil device proximate the core element introduces a distortion force in the core element in at least one of the X and Y directions or about the Z axis as desired a mounting device suspends the core element with respect to the coil means to permit relative movement therebetween in response to the distortion force.
Abstract:
A synchronous motor comprising permanent magnets (35, 41) with N poles arranged at ends of N magnetic poles of a rotor, permanent magnets (38, 34) with S poles arranged at ends of S magnetic poles of the rotor, magnetic pole portions (40) made of soft magnetic member at middle portion of the N magnetic poles of the rotor, and magnetic pole portions (39) made of soft magnetic member at middle portion of the S magnetic poles of the rotor. The synchronous motor has a structure in which the respective N and S magnetic poles are shifted in the rotor rotation direction relatively by NN/NR of a stator slot pitch, wherein NN and NR are integers equal to or less than the number of poles formed in the rotor.
Abstract:
A stator structure enables a claw pole motor to be reduced in diameter and to highly increase its performance. In a stator structure of the claw pole stepping motor comprising a stator that constitutes magnetic circuits in yokes 2 and 3 made by sheet metal working of a soft magnetic steel plate and a rotor that is disposed inside the stator for rotation; pole teeth 4 made of soft magnetic material are provided as separate parts independent of the yokes 2 and 3, and held at the inner circumference of a bobbin 5 made of polymeric material, thereby allowing easy manufacturing of a long stator or a stator with a small diameter for which the pole teeth 4 have difficulty, otherwise, in being well organized, at the same time allowing the area of cross section of the pole teeth 4 to be arbitrarily determined so as not to cause magnetic saturation, allowing to provide a high output power, allowing to determine the pole teeth 4 in the bobbin 5 so as not to disorder the arrangement of the pole teeth 4 which are responsible for the step angle accuracy, and thus allowing to accomplish high accuracy in step angle accuracy.
Abstract:
A device for providing angular displacement of an axis in a direction selected from the X or Y direction or rotational movement about the Z direction with respect to the axis. The device comprises a magnetic core element which produces a magnetic field and defines a Z axis. The core element is capable of displacement in the X and Y directions respectively, and also rotational movement about the Z axis. A coil device proximate the core element introduces a distortion force in the core element in at least one of the X and Y directions or about the Z axis as desired a mounting device suspends the core element with respect to the coil means to permit relative movement therebetween in response to the distortion force.
Abstract:
An electrical machine has a rotor shaft (12) which carries a plurality of rotor discs (14) for rotation therewith. Each rotor disc (14) has pairs of rotor rims (16) secured thereto. Each rotor rim (16) consists of a single row of alternate magnets (20) and laminated pole pieces (18) and is opposed by a series of stator cores (22) which straddle the rotor rim (16). Armature windings (24) are disposed within the stator cores (22) for operably exciting said stator. The phase relationship between the currents through the armature windings (24) and the orientation of the stator cores (22) or the magnets (20) in opposing rims (16) are such that the effects of electromagnetic coupling, long path fluxes and torque ripple is reduced.
Abstract:
An in-hub brushless permanent magnet DC motor has a radial working gap but uses coils wound in the axial direction of the motor. The coils generate fields that interact with the permanent magnet fields across the radial gap. The stator includes a plurality of angularly spaced stator teeth that have faces radially spaced across the gap from the permanent magnet. The stator teeth are connected to the base and extend axially into a cavity within the hub. The permanent magnet is a magnetically-segmented ring magnet located on an outer rim of the hub radially outwardly from the stator teeth. The magnetic flux from the permanent magnet is directed radially across the gap and into the stator teeth. Each stator tooth has an axially oriented post around which is wound a coil that generates an axial field. The axially-oriented part of each coil forms part of the magnetic circuit. The magnetic flux directed radially into each stator tooth is turned axially into the post and through the coil. The axially directed magnetic flux through the coil and post on each stator tooth is redirected from the axial direction to the circumferential direction by a ring magnetic flux guide. The ring flux guide interconnects the stator teeth and forms part of the magnetic circuit. Because the coils are wrapped around axial posts instead of the stator teeth a larger coil volume is obtained which results in higher motor efficiency and reduced heating of the bearing system. The angular spacing between adjacent teeth can be made very small or even eliminated since there is no need to locate a winding device between them as is required in conventional radial-gap motors. This results in a reduction in the motor cogging torque, which in turn allows a higher tooth/pole symmetry leading to better force balance and lower acoustic noise.