Abstract: In the case of a mixer for constructional materials or the like, comprising a driven drum which is rotatably mounted on a yoke pivoting on a frame and is able to be driven by means of a frame-mounted drive device including an air-cooled electric motor which is arranged in an encapsulating means, provided with a switch and plug unit and having an air intake opening and an air outlet opening and which is adapted via a countershaft to drive a drive shaft which is associated with the drum and whose axis of rotation is in alignment with the pivot axis of the yoke, wherein the encapsulating means is constituted by a housing means accommodating the motor and the countershaft transmission, and having an air intake opening in communication with a flow reversing intake duct and whose outlet opening leads into a spent air duct which ends outside the housing means and is designed to prevent access therethrough, simple and low-cost means are utilized to ensure that the mixer has a comparatively high degree of safety and e

Abstract: A stator wedge having a cross section of a dove-tail is disposed at a radially inner side of each of a plurality of slots formed in a ring-shaped core and having a coil inserted therein. Also disclosed is a guide jig for guiding the wedge having the dove-tail cross section into the slots. The guide jig has formed in both side surfaces an edge portion engageable with the wedge.

Abstract: A circuit is disclosed for protecting an integrated circuit or another circuit from damage due to electrostatic discharge. The protection circuit includes a triggering circuit and a clamping circuit. In response to an electrostatic discharge, the triggering circuit turns on the clamping circuit to clamp a node of the protected circuit to both an upper and a lower potential. This allows the electrostatic discharge to dissipate harmlessly to either potential source, depending upon its polarity. Preferably, the triggering circuit consists of a resistor-capacitor network which generates the required control signal every time power is supplied to the circuit being protected, while the clamping circuit consists of a pair of transistors for connecting an input pin to both the high and low potential sources. Typically, one protection circuit is coupled to each input/output pin of the integrated circuit being protected.

Abstract: A step motor which comprises a stator having a winding wound therearound, a rotor rotatably provided with respect to the stator, a multiplicity of pole teeth formed on mutually opposing faces of the stator and rotor, a position detector for detecting a position of the rotor, and switching means for changing over a phase current flowing through the winding wound around the stator on the basis of a position signal indicative of the position of the rotor, wherein the pole teeth and a position detectable portion are integrally formed on a rotary yoke of the rotor and the position detectable portion is detected by the position detector.

Abstract: A first multi-phase dc motor comprising: a field-magnet portion having P field magnetic poles positioned as a circular array at angularly equally spaced intervals; and an armature having cores as angularly equally spaced N protruding poles providing N slots therebetween with .phi.-phase coils disposed therein, either said field magnet portion or said armature being rotatable with respect to the other; and P, N, and .phi. being defined by P=2n, N=2n.+-.1, and N is not m times .phi. wherein n and m are natural numbers.A second multi-phase dc motor comprising: a field-magnet portion having P field magnetic poles positioned as a circular array at angularly equally spaced intervals; and an armature having cores as angularly equally spaced N protruding poles providing N slots therebetween with .phi.-phase coils disposed therein, either said field magnet portion or said armature being rotatable with respect to the other; and P, N, and .phi. being defined by P=2n, N=2(n.+-.1), and N is not m times .phi..

Abstract: A D.C. motor includes a rotor and a stator with chordally oriented electromagnetic units, with windings pulse energized to establish a rotary force on the rotor as a result of the non-radial orientation of the driving forces. Each electromagnetic unit including a pole is extended along a substantially chordal line of the motor. All rotor poles are connected to a shaft by a radial crank arm and may be integrally or separately formed. A sensor detects pole alignment to then pulse the windings, and generate opposing magnetic forces to rotate the rotor. The winding establish opposite polarity at the adjacent pole ends of aligned poles to drive the rotor. A D.C. motor connected to the rotor, or special internal poles may be provided to align the poles for starting the motor. A plurality of the motors mounted to a common shaft with the electromagnetic units in the adjacent motors offset from each other and sequentially pulsed to establish continuous rotation.

Abstract: The present invention provides an arrangement of a motor intended to prevent transmission of vibrations, i.e., noises between a noise preventing circuit and the motor. The noise preventing circuit is formed into a unit, thereby realizing simple and automatic installation thereof into the motor without giving influences upon the vibration preventing structure of brushes. According to the arrangement, the noise preventing circuit may not be used and the specifications thereof may be easily changed.

Abstract: A motor assembly apparatus which includes a housing, an output shaft, a brush assembly, a stator, and a male connector disposed within the housing. The male connector includes a first lug and a second lug and apparatus for connecting the male connectors to the brush assembly and to the stator. In some forms of the invention the male connectors are spade lugs which may be coplanar axially aligned, and the apparatus for connecting the male connectors may include a first planar portion and a second planar portion. The first planar portion is coplanar with the spade lugs in some forms of the invention and the second portion is disposed in oblique relationship to the first portion. The housing may include first and second slots dimensioned and configured and aligned respectively with the first and second spade lugs to allow entry of associated mating electrical connectors.

Abstract: A DC brushless motor which includes a hollow cylindrical stator (2) having a plurality of exciting coils (6) secured to an inside thereof; a solid cylindrical rotor (7) provided within the stator and having at least two permanent magnets (30) therein so as to form a magnetic circuit with the stator; a rotary shaft (8) secured concentrically with said rotor; and a pair of bearings (10, 12) secured to opposite ends of the stator for supporting the rotary shaft for rotation. The permanent magnet is placed between a pair of high permeability yoke portions or pole pieces each extending in a radial direction to form a magnetic circuit and made of a rare earth element-transition metal-boron alloy.

Abstract: A rotating electric machine comprises an armature arrange opposite the periphery of a magnet which is rigidly fitted to a rotary shaft. The armature has a plurality of salient poles arranged on it and projecting towards the magnet. The machine is characterized in that the surface of each of the salient poles facing the magnet comprises bevelled areas arranged at the lateral ends thereof and the magnet is a hollow cylindrical ring magnet. With such an arrangement, its induced voltage can show a sustained sinusoidal waveform which is free from high harmonics to an extent greater or equal to that of a rotating electric machine comprising a segmented magnet and consequently the level of cogging of the inventive machine can be minimized. If the ring magnet of a rotating electric machine according to the invention is skewedly magnetized relative to the axis of the ring magnet, the effect of the machine in maintaining the sinusoidal waveform of the induced voltage can be further enhanced.

Abstract: An electric motor comprising a main frame having an en and an interior, a stator supported within the main frame, an end frame supported within the main frame and spaced from the end of the main frame so as to divide the interior of the main frame into a motor compartment containing the stator and an equipment compartment between the end frame and the end of the main frame, a bearing supported by the end frame, a rotor shaft rotatably supported by the bearing, a rotor located radially inwardly of the stator and mounted on the shaft for rotation therewith, a modularized apparatus platform which is located within the equipment compartment, and which includes a generally cup-shaped portion that opens in the direction away from the end frame and that has an inner surface defining a control chamber, an electrical component supported by the platform and located within the control chamber, and a cap which is fixed to the apparatus platform and which closes the control chamber.

Abstract: An electrical machine contains winding coils, in which the winding coils are able to be slid from the stator bore on to pole bodies provided on the stator of the machine and are retained on the pole bodies. The power/space ratio of the winding space available on the pole bodies is able to be increased by inserting at least one clamping part on the end faces of the pole bodies between the specific end face and the mounted winding coil. This clamping part is provided with at least two retention arms which extend in mutual opposition in the circumferential direction of the machine. The clamping part extends with the retention arms under the winding coil on the coil side facing the exposed end of the pole bodies.

Abstract: A latchup and electrostatic discharge protection circuit for an analog reference or bias voltage power supply input connected between an input power providing terminal of the power supply and a power rail of a CMOS integrated circuit having a parasitic latch device. The protection circuit comprised of three field effect transistors close-circuits a path from the power supply input to the power rail for normal power supply conditions and open-circuits the path for excessively positive and negative voltages at the power supply input, thereby safeguarding the CMOS integrated circuit from currents resulting from the excessive positive and negative voltages.

Abstract: Thirty-sixth order harmonic noise generation is suppressed in an automotive-type alternator generator by forming a countersink in the leading edge of a through bolt bore to provide a transversely abutting conical surface to the flange of a through bolt which is used to retain the housing elements.

Abstract: There is disclosed a system and method for rotationally controlling a circular structure, such as a dome, from the outer circumference of the dome. The system uses a linear stepping motor having a circular fixed section and a movable section. The movable section is attached to the rim of the dome and is in magnetic coupled contact with the fixed section. Controllable magnetic fields induced between the movable and stationary sections cause the movable section, and hence the dome, to drive around the circular fixed section. The dome speed is controlled by the magnetic fields and the position of the dome is monitored by monitoring the position of the active magnetic fields.

Abstract: The invention concerns an electromagnetic micromotor. Such micromotor includes a rotor constituted by a permanent magnet (52) partially embedded in an overmolding (54) formed from plastic material and which is provided with coupling means to a driven mechanism, a cage (60) including a bottom and a cover and intended to be engaged in the interior of a stator while the rotor is mounted for free rotation in the cage, and rotation guide means for the rotor (50) in the cage (60), such micromotor being characterized in that the rotation guide means are constituted, on the one hand, by two housings (74, 76) coaxially arranged in the overmolding (54), and on the other hand, by two spindles (78, 80) respectively integral with the bottom and the cover of the cage and intended to be accommodated respectively in one of these housings. Such micromotor is intended to equip timepiece movements of very small dimensions, for instance for ladies' watches.

Abstract: A brushless motor is provided with a rigid resin member that faces one end of the drive shaft with a predetermined gap therebetween. The rigid member is positioned to be struck by the end of the drive shaft when the drive shaft vibrates. The impact of the collision is absorbed by the elastic deformation of a resilient member that supports the rigid member. This prevents noise from being generated by vibrations of the drive shaft.

Abstract: A miniature electric motor having a stator composed of a strip of rubber magnet having a varying width. The stator strip has; polarized regions of wide width, non-polarized regions of narrow width, and regions which bridge said polarized regions having a continuously varying width. The periphery of the polarized and non-polarized regions of the stator strip contains indents and protrusions to improve the cogging characteristics of the motor.

Abstract: A motor with a decelerating apparatus includes a motor, a gear box connected to the motor, a pinion gear attached to an end of an output shaft of the motor, two or more decelerating gears engaging with the pinion gear, a rotation shaft connected to each of the decelerating gears as a unity, a bearing for supporting the rotation shaft of each of the decelerating gears provided in the gear box, and a mounting unit for fixing the gear box to a load, an output terminal of the rotation shaft of each of the decelerating gears being connected to a rotating load, the gear box comprising a bearing for supporting a rotation shaft of a first decelerating gear which engages with the pinion gear and a bearing for supporting a rotation shaft of a second decelerating gear which engages with the pinion gear and is different from the first decelerating gear in the number of teeth, the mounting unit connecting the output terminal of the rotation shaft of either of the first and second decelerating gears to the rotating load, a

Abstract: Protection for an encased motor driven device is enhanced by utilizing additional sensors with associated resistance heaters to actuate the thermally responsive contacts of the internal line break. The sensors and heaters are powered from an auxiliary winding in the motor coils. When applied to a hermetic scroll compressor, the compressor can be protected against reverse rotation.