Abstract: A brushless motor with stator cores integrated with a holder, comprises a rotor consisting of a pulley mounted on a motor axis and a rotor case provided with a main magnet and an FG magnet on inner and outer peripheral faces of a lateral curved surface of the rotor case, and a stator wound with a driving coil and integrated with a holder for holding function, in which the stator is fixedly mounted on a PCB provided with a hole element and is structured to support the rotation of the motor axis.

Abstract: A medical instrument, such as a surgical drill, includes a battery-powered handpiece and a booster. The handpiece includes an electrical device, such as a motor, having an operating characteristic responsive to changes in DC voltage and a battery that applies a first DC voltage to the electrical device. The booster is disposed externally of the handpiece body and includes a DC power source and a cable for connecting the DC power source with the battery in the handpiece to apply a second DC voltage to the electrical device. The operating characteristic of the electrical device, e.g., speed, is modified by selectively coupling or decoupling the booster from the handpiece.

Abstract: An induction motor includes a stator defining stator inner and outer diameters extending about a longitudinal axis, the stator includes a plurality of windings extending longitudinally and circumferentially about the longitudinal axis between the stator inner diameter and the stator outer diameter and passing an electric current therethrough to create a magnetic field, a rotor extends along the longitudinal axis having a rotor length and a rotor outer diameter less than the stator inner diameter, the rotor being rotatable about the longitudinal axis relative to the stator, the rotor including at least one electrically conductive bar extending parallel to the longitudinal axis adjacent the rotor outer diameter for receiving an induced current due to the magnetic field, an end cap at each end of the rotor contacting the at least one electrically conductive bar and a capture ring attached to each end of the rotor to prevent movement between the end caps and the rotor.

Abstract: The invention provides a brush cartridge for a commutator-type motor. The brush cartridge includes a housing that is made of an electrically conductive material and that has an integrally formed terminal so that the cartridge can be plugged into a circuit without the need for wiring. The brush cartridge also includes a brush supported in the housing for sliding movement relative thereto and a spring member for biasing the brush into engagement with a commutator on the motor when the cartridge is installed. The brush cartridge also includes a flexible shunt connected between the housing and the brush. The shunt limits the range of sliding movement of the brush to permanently retain the brush in the housing.

Abstract: A passive magnetic bearing structure for radially supporting a rotor with respect to a stator is provided, in which a magnetic circuit is mounted on the rotor or stator for generating two strongly different axial magnetic fields in two concentric angular gaps coaxial to the rotation axis and radially spaced from one another. At least three shortened superconducting turns are mounted on the stator circumferentially around the rotation axis so that under any tolerable shift of the rotor, one edge of every turn will be placed in one annular gap comprising magnetic field, and the radially opposite edge will be placed in the other gap.

Abstract: A motor comprises a rotary shaft, an oil impregnated sintered bearing rotatably supporting the rotary shaft, a bearing holder supporting the oil impregnated sintered bearing and a motor case. A lateral pressure device is provided to the rotary shaft which abrasively contacts the rotary shaft from a radial direction and provides a lateral pressure so that the rotary shaft is displaced in the radial direction. The lateral pressure device further comprises an inner ring made of an oil impregnated sintered member in which a through-hole abrasively contacts the rotary shaft from the radial direction is formed, an elastic member which provides a lateral pressure so that the rotary shaft is displaced in the radial direction and an outer ring which holds the elastic member and is fixed to the motor case.

Abstract: A spindle motor assembly which utilizes a reservoir of electrically conductive fluid to provide a conductive path through the assembly. The spindle motor assembly includes a spindle shaft that is located within a housing and rotated by an internal motor. The end of the spindle shaft is located within the reservoir. The reservoir also is electrically coupled to the housing. The electrically conductive fluid provides a conductive path between the spindle and the housing while minimizing the frictional forces on the spindle. The spindle may be coupled to a chuck that holds a magnetic disk within a disk certifier. The magnetic disk is electrically grounded to the housing through the chuck, the spindle and the electrically conductive fluid.

Abstract: A stator for a dynamoelectric machine includes a stator frame including a main frame and axial ribs cylindrically arranged in the main frame to extend parallel with an axis of rotation of a rotor such that a space is defined. The main frame includes a bottom wall, side walls standing from both radial ends of the bottom wall respectively, and connecting walls standing from both axial ends of the bottom wall and interconnecting both ends of the side walls, respectively. Each axial rib has opposite ends connected to the respective connecting walls and an intermediate portion between the ends. The intermediate portion of each axial rib is spaced away from the side walls. A stator core is formed of a stack of laminations of steel sheets and fitted in the space defined by the axial ribs to be held in position.

Abstract: The present invention is a energy storage apparatus. The energy storage apparatus includes a rotor and a stator and a hub rotatably positioned about a stationary axial shaft. The hub also includes at least one spoke plane projecting radially from the hub, and the at least one spoke plane contains at least one spoke. The at least one spoke includes an in-plane bending stiffness exceeding an out-of-plane bending stiffness.

Abstract: A bobbin-wound stator for small single-phase AC motors that surmounts magnetic compromises required by previous implementations is fabricated of stacked two-piece laminations and a split winding bobbin fitted about a first one of the lamination piece stacks that permits bobbin winding of a single coil about the pole neck of a magnetic yoke having pole shoes magnetically coupled to each other, but not in direct contact with each other, at a predetermined clearance distance chosen to balance rotor-to-armature flux linkage, armature inductance, and reluctance torque. The second lamination piece stack is pressed into the first lamination piece stack supporting the bobbin-wound coil to complete the stator. The stator is usable in several single-phase AC motors, including electronically commutated motors, chaotically-starting permanent magnet motors, and shaded-pole induction motors.

Abstract: A first conductive plate is formed integrally of a single conductive sheet comprising a plurality of brushes and power supply terminals that are partially short-circuited, and a second conductive plate is formed integrally of a single conductive sheet comprising connector pins for connection for other components that are partially short-circuited.

Abstract: A voice coil motor has a flux return housing with at least one magnet and a soft iron cantilevered core. A coil holder, including an electrical coil spaced from magnet, is telescoped over the core with an air gap between the sides of the coil holder and the sides of core. The coil holder has an open end and a closed end forming with the distal end of the core a pressurized air bellows, which can vertically support a payload such as a Z-axis motion stage. The coil holder is telescopically movable with respect to the core along the air gap supplied with pressurized air through longitudinal air ducts in the core and through transverse orifices extending from the ducts to the air gap. A regulator is connected to a core central bore for adjusting pressure in a bellows chamber between the coil holder closed end and the distal end of the core for supporting the payload.

Abstract: A piezoelectric sensor probe comprises an elongate insulative support member supporting a plurality of piezoelectric sensing elements spaced along the length of the member, the support member has respective conductors extending from one end of the member to each of the sensing elements for conducting electrical signals to and from each sensing element.

Abstract: A transverse flux machine includes an outer stator having a plurality of soft iron outer stator elements and an outer ring winding; an inner stator having a plurality of soft iron inner stator elements and an inner ring winding; and a rotor having a plurality of soft iron rotor elements and a plurality of rotor magnets, the rotor elements positioned in alternating relationship with the rotor magnets when viewed with respect to a plane perpendicular to an axis of the transverse flux machine. Also with respect to this plane, the rotor magnets, the inner stator elements, and the outer stator elements each have a width. The width of the rotor magnets narrows in a direction toward the inner stator. Also, the width of the inner stator elements is smaller than the width of the of the outer stator elements.

Abstract: An air gap varying motor includes a base, a rotation body, a motor rotor, a motor stator which is fixed in the base, and has an inner surface for contacting and supporting the motor rotor to enable the motor rotor to rotate about a predetermined axis, and which is disposed to have a distance spaced from said motor rotor An engagement and adjustment member connects the rotation body and the motor rotor and to adjust a distance between the motor rotor and the motor stator.

Abstract: An electric motor with an internal rotor (10), which comprises a free intal chamber (12), and a stator (14) disposed at a radial spacing from the rotor (10) has a more compact construction and can be assembled more easily. The electric motor is characterized in that at least part of a gear (16) is disposed in the free internal chamber (12) of the rotor (10).

Abstract: An elastic wave position-sensing device comprising two elastic wave transducing units X and Y, a nonpiezoelectric plate, and a controlling system connected with the units X and Y. Each unit consists of a piezoelectric substrates P.sub.T and P.sub.R, interdigital transducers T.sub.0 and T.sub.i (i=1, 2, . . . , N) formed on one end surface of the piezoelectric substrate P.sub.T, interdigital transducers R.sub.0, R.sub.i1 and R.sub.i2 (i=1, 2, . . . , N) placed on one end surface of the piezoelectric substrate P.sub.R. Each of the interdigital transducers R.sub.i1 and R.sub.i2 is placed such that the finger direction thereof is slanting to that of the interdigital transducer T.sub.i by an angle .alpha.. The thickness d of the piezoelectric substrates P.sub.T and P.sub.R is smaller than an interdigital periodicity P of the interdigital transducers T.sub.0, T.sub.i and R.sub.0. The thickness of the nonpiezoelectric plate is smaller than two times the thickness d, the piezoelectric substrates P.sub.T and P.sub.

Abstract: A surface acoustic wave (SAW) position-sensing device comprising a piezoelectric substrate, an input interdigital transducer (IDT) T formed on an upper end surface of the piezoelectric substrate, and an output IDT R formed on the upper end surface of the piezoelectric substrate such that the finger direction of the IDT R is slanting to that of the IDT T by an angle .alpha.. The thickness d of the piezoelectric substrate is larger than three times an interdigital periodicity P of the IDT T. An interdigital periodicity P.sub.N along the vertical direction to the finger direction of the IDT R is equal to the product of the interdigital periodicity P and cos .alpha.. An overlap length L.sub.P along the finger direction of the IDT R is equal to the product of an overlap length L of the T and sec .alpha.. When an electric signal is applied to the IDT T, the SAW is excited on the upper end surface of the piezoelectric substrate, and is transducer to electric signals E.sub.j with phases .theta..sub.

Abstract: An improved brush assembly is provided for conducting electrical power from a fixed power system to a rotating ice protection system. The invention is especially adapted for use with an aircraft propeller ice protection system. According to an aspect of the invention, the brush assembly has a housing with a brush enclosure, the enclosure having slots provided therein for slidably receiving a plurality of brushes. A plurality of wear inserts are disposed in the slots adjacent the brushes in order to provide a wearing surface to prevent excessive wear of the brushes.

Abstract: A magnetic bearing for magnetic centering of a rotor relative to a stator relative to two radial centering axes includes actuators operating relative to centering axes and speed sensors having sensing axes coplanar with the centering axes. The rotor includes a ring partly defining the airgaps of the actuators and the sensors.