Abstract: A slim cylindrical coreless motor for mounting in a device without using an additional mounting element. The slim cylindrical coreless motor has a cylindrical case having a bearing holder at a first end and an end bracket fitted to the second end of the cylindrical case. The slim cylindrical coreless motor has first mounting portions extending outward from the first end of the cylindrical case and second mounting portions extending outward from the end bracket. The first and second mounting portions do not extend beyond the circumference of the case, and at least one of the first and second mounting portions is a power supply terminal. In addition, a weight is eccentrically mounted on a shaft extending out of the case, which enables the motor to be used as a vibrator motor. The weight has a recess near the first mounting portions.

Abstract: An electromagnetic converter in which a mobile magnetic pole body supported by a thin spring is driven by an exciting coil. A restricting member limits movement of the spring so the spring is not deformed beyond a stress limit when the spring receives an impact. The electromagnetic converter produces a large vibration using a simple structure which can withstand an impact without increasing the strength of the spring so the weight of a mobile magnetic pole member can be increased. The restricting member is a soft elastic member and arranged either on the spring or at a location opposite the spring.

Abstract: A brushless motor having a transfer device includes a rotor in which a resin transfer device is disposed at one side of a rotor case, and a magnet is disposed at the other side of the case, a support portion integral with the rotor case to prevent the resin transfer device from being separated in an axial direction and sliding in a rotational direction, a shaft supporting the rotor, a stator base where a shaft holder for supporting the shaft is disposed, and a stator having armature coils for driving the rotor. Thus, the transfer device is prevented from being separated and strength in a rotational direction can be secured by the support portion. Also, the cost and the number of installation steps is reduced.

Abstract: An eccentric rotor includes an eccentric printed wiring commutator device having first and second surfaces, an expanded fan when viewed in a plane, a central hole for shaft installation, a plurality of segment patterns exposed toward a periphery of the first surface, at least one printed circuit armature coil at least one of the first and second surfaces, and an eccentric wound armature coil installation guide, wherein an end connection of each coil is arranged at an outer circumference during rotation; a wound, non-molded air-core coil incorporated in an air-core position determination guide and having an end portion connected to the end connection; a resin bearing holder inserted in the shaft installation hole with a first part protruding toward the segment pattern and a second part extending toward the second surface of the printed wiring commutator device; and a resin eccentric weight having a density-exceeding 3 at a fan-like arc-shaped portion of the printed wiring commutator device.

Abstract: A compact motor capable of being reflow-soldered, which can solve a problem of thermal demagnetization of a magnet with a simple structure, has magnets in a housing. At least a part of a surface to which the magnet is attached is separated by an acrylic adhesive sheet and heat resistant resin from metal members, such as a bracket and shaft forming part of the housing. The shaft is stainless steel having a low heat conductivity or an additional cover is used for the shaft to withstand reflow-soldering.

Abstract: A brushless motor having a resin bearing including a rotor with an integral output device at one side of a rotor case and a magnet at the other side, a shaft supporting the rotor, a resin bearing supporting the shaft for rotating, a stator base incorporating the resin bearing, a stator for driving the rotor, and an oil containing portion in the resin bearing. The oil containing portion includes grooves, a concave portion, and an oil barrier device located at the resin bearing, so the number of parts as well as the cost is reduced and a simple structure prevents the oil from leaking.

Abstract: The present invention provides a disc type eccentric rotor having at least two air-core coils, the rotor comprising a flat type commutator member having a shaft insertion through hole in the center thereof, a plurality of commutator land segments formed around the shaft insertion through hole on a first side of the flat type commutator member, wound type air-core coil arrangement guides formed around the shaft insertion through hole on a second side of the flat type commutator member, air-core coil end portion connection lands formed circumferentially on the second side of the flat type commutator member, a shaft holder installed around the shaft insertion through hole on the second side of the flat type commutator member, and wound type air-core coils installed at the wound type air-core coil arrangement guides and having the end portions thereof connected to the air-core coil end portion connection lands.

Abstract: A brush assembly for a small motor has brushes that are not separated from a commutator when the brushes contact the commutator. The brushes are arranged so that the angles formed by the brushes where the brushes contact the commutator are maintained uniform during assembly of the motor. The pair of brushes include bases connected to each other through a lead frame. The pair of brushes are embedded in a support by molding the support with middle portions of the brushes sandwiched by part of the support so that the angles formed by the pair of brushes where the brushes slidably contact the commutator are uniform.

Abstract: A dc brushless vibrator motor has a base member, a shaft connected to the base member, a stator having magnetically conductive cores and respective armature coils angularly uniformly disposed about the shaft and having an eccentric mass distribution. The rotor has a magnet holder, an annular permanent magnet fixedly connected to the magnet holder and concentric with the shaft and radially outside the stator. The magnet has alternating north and south magnetic poles arranged at a uniform angular pitch. In order to rotationally imbalance the rotor, an arcuate weight is fixed to the magnet holder and/or a part of the magnet holder is cut out.

Abstract: An eccentric rotor including a printed wiring commutator device where a hole for shaft installation is formed at the center thereof and a plurality of segment patterns are formed at the periphery of one surface thereof, a winding type armature coil integrally formed in a non-mold manner so as to be eccentric toward the other surface of the printed wiring commutator device, an end connection portion installed at such a position at the outer circumferential portion of the printed wiring commutator device that latching an end portion of the winding type armature coil is possible within a range of not deviating from the turning circumference during rotation and simultaneously electrical connection with the segment patterns is possible, and also at the position of not overlapping the winding type armature coil viewed from a plane, a resin bearing holder inserted in the shaft installation hole so that part thereof protrudes toward the segment pattern and simultaneously the other part thereof is extended toward the

Abstract: A flat coreless vibrator motor holds a rotor in a specific position by magnetic flux from a magnet, increasing vibration by increasing the eccentricity of the center of gravity of the rotor, easily moving since the adjacent segments of a commutator are not short-circuited, and having reduced manufacturing costs. In the flat coreless vibrator motor, a four-pole magnet which has alternate north and south poles for providing a magnetic field to an eccentric rotor faces the eccentric rotor, in one side of which at least one coreless coil is located and in which a commutator having four segments, each diametrically-opposite pair of which are short-circuited, is installed.

Abstract: A small cored motor has a ball bearing which is a relatively long life, the overall thin dimension, a low manufacturing cost, low-friction as well as substantially vibration-free rotation. The ball bearing includes a biased and movable portion for promoting low-friction and substantially vibration-free rotation as well as a ball retainer for separating balls apart at a predetermined distance.

Abstract: One end of a shaft is fixed to a first portion of a housing. An eccentric rotor is located in the housing rotatably on the shaft. The other end of the shaft is fitted into a concave portion on a second portion of the housing, so the rotor may be assembled in the housing in a simple manner and radial movement of the shaft can be prevented without enlarging the fixing portion of the shaft. Even if the diameter of the shaft is small, the shaft can withstand an impact resulting from dropping of the motor.

Abstract: A vibrator motor has a generally sector-shaped eccentric armature rotor that has a nonmagnetic body including core parts, around which armature coils are individually wound. The core parts are disposed at an even pitch angle, but within a 180.degree. angular range, about the rotational axis of the rotor. A rotor body of one embodiment consists of a first part and a second part that includes the core parts and the first part is made of a synthetic resin and the second part is made of a synthetic resin or a nonmagnetic but electrically-conductive metal. A rotor of an additional embodiment has a single-piece body of a synthetic resin that integrally has the core parts.

Abstract: A flat coreless vibrator motor has a case and a flat generally sector-shaped armature rotor. The rotor has a body that comprises a first part made of a first synthetic resin having a density of less than 1.8 and a second part made of a second synthetic resin having a density of greater than 5.0. The first part is disposed generally radially inside of the second part. A plurality of flat armature coils are molded in the first part and arranged at a predetermined pitch angle within an angular range of 180.degree. about the rotating axis of the rotor in non-overlapping relationship with one another. Alternatively, at least a portion of the second part is interposed between a field magnet of the motor and a cylindrical side plate of the case.

Abstract: A dc brushless vibrator motor employs a cylindrical coreless stator winding unit having at least three stator coils arranged at about an even pitch angle and a rotor that includes an axially extended eccentrically-weighted permanent field magnet that is magnetized so as to have alternate north and south poles about the rotational axis of the rotor. A cross-section of the field magnet in a plane perpendicular to the rotational axis has generally an arcuate or sectorial shape which is within an angular range of 180.degree. to 270.degree. about the rotational axis. The center of mass of the rotor, therefore, is off the rotational axis, thereby causing vibrations.

Abstract: A dc vibrator motor has a generally cylindrically-shaped magnetically conductive case, a ring-shaped permanent field magnet, and an armature rotor including a shaft. The field magnet has at least four and at most eight alternate north and south pole sections arranged at an even angular pitch coaxially with the shaft. The armature rotor has at least three armature poles having an angular interval of 60.degree. between adjacent poles and at most six armature poles having an angular interval of 30.degree. between any pair of adjacent poles and at least six and at most twelve commutator segments arranged at an even angular pitch coaxially with the shaft. A pair of commutator brushes have an angular interval of at least 45.degree. and at most 90.degree. . Since all of the armature poles are situated within an angular range of 180.degree. about the shaft, the center of mass of the rotor is radially off the shaft, thereby causing vibrations.

Abstract: A vibrator motor has an armature rotor whose center of mass is off the axis of the shaft thereof. The rotor includes at least three poles each having an winding arm and an arcuate pole blade. All of the blades have an equal length and are disposed angularly evenly about the axis of the shaft so that all of the blade-to-blade spacings are equal. At least one winding arm is angularly out of alignment with the dimensional center of the arcuate blade of the corresponding pole, or, the size and the mass of at least one arm is different from those of any other arms, or, the mass of at least one of armature windings is different from the mass of any other armature winding, or, a weight is fixedly attached to the rotor in an eccentric manner either between two armature poles or on the shaft.

Abstract: A flame detecting and alarm system has a ultraviolet radiation sensor (UV sensor) which detects ultraviolet radiation and outputs sensor output pulses. The spacings of the sensor output pulses represent amounts of energy of the ultraviolet radiation detected by the UV sensor. Each pulse spacing of the sensor output pulses is measured, and the pulses are regarded as "continuous" if the pulse spacings are less than a predetermined time period. The presence of a predetermined number of "continuous" sensor output pulses is interpreted as a recognition of a flame, and an alarm is activated.

Abstract: A small dc vibrator motor for use in a wireless alerting device includes a housing, a non-rotatable shaft fixed to the housing, a cylindrical magnet fixedly mounted on the shaft, and a rotor which is rotatably mounted on the shaft. The rotor includes a cylindrical coreless winding assembly between the magnet and the housing, and eccentric bearings, or combinations of concentric bearings and eccentric weights, on both ends of the winding assembly. The eccentric bearings, or the combinations of concentric bearings and eccentric weights, cause vibrations when the rotor rotates.