Abstract: A multi-speed electric motor (1) has a main electrical winding (3) and an auxiliary electrical winding (5) connected in parallel. One additional electrical winding (21) is connected in series with the parallel connected main and auxiliary windings, and another additional electrical winding (23) is connected in series with this third winding. A temperature sensitive resistive element (25) is connected in parallel with at least one of the additional electrical windings. The resistive element improves the motor's starting torque when one or more additional windings are initially connected in the motor circuit as it is started.

Abstract: A cooling fan positioned within the casing of an electric motor comprising a plurality of closely spaced frusto-conical disks carried by the motor shaft which draw intake air past the motor rotor and stator when they are rotated. Bodies of air between the rotating disks are then thrown radially outward by centrifugal force and directed to exhaust vents formed in the casing.

Abstract: The present invention provides an improved electric drum brake (10). The electric drum brake (10) utilizes vibration absorbing mount (27) for positioning an electro-magnet (24) on the tang (22) of an actuating lever (21). The vibration absorbing mount (27) prevents metal-to-metal contact between the tang (22) and the electromagnet (24) and eliminates or greatly reduces road vibrations.

Abstract: A ventilation structure in a vertically mounted motor is able to avoid clogging from accumulated brush abrasion dust. A ventilation path adapted to provide ventilation between the interior and the exterior of the motor casing is formed from a communication hole defined in a bottom portion of the motor casing, extending between the exterior of the motor casing and a circular hole defined in the bottom portion of the motor casing; a communication groove defined in an annular rib, extending upwardly from the bottom portion of the motor casing to form a bearing seat and encircling the circular hole to bypass the bearing in the bearing seat; and a gap C defined between the annular rib and a cap member covering the bearing and annular rib.

Abstract: In a piezoelectric resonator having an ultrathin vibratory portion formed by a cavity made in a piezoelectric block and a thick frame-like rib formed integrally with said vibratory portion and surrounding it, an excess adhesive receiving groove or the like is cut in one marginal portion of the frame-like rib between an adhesive coated region. The resonator is fixedly housed in a package by use of an adhesive coated on one marginal portion of the frame-like rib along the z-axis direction, or by means of elastic pawls without using the adhesive. In this case, one marginal portion of the frame-like rib on the opposite side from a pad deposited on one side of the piezoelectric resonator is bonded to the bottom of the package.

Abstract: Antifriction bearings include circumferential as well as axial flux paths that the flux of four identical-polarity magnetic poles follows about an annular stator having annular end-pieces that enables a square law reduction in rotor eddy current effects over the heretofore known magnetic bearings. In one embodiment, control coils alone provide magnetic suspension along orthogonal X, Y axes, and in another embodiment, combination control and bias coils cooperate to provide magnetic suspension along the orthogonal X, Y axes. The stator and rotor are preferably constituted, in part, of a lamination of high magnetic permeability material.

Abstract: A simplified, readily removable air gap baffle ring for a gas cooled dynamoelectric machine, such as a turbine generator. The baffle ring comprises two composite rings with a seal material sandwiched therebetween and bonded into a single ring structure. The seal ring attaches to finger plate extensions which are an integral part of the generator core, and forms an air gap seal between the rotor retaining ring and end wedges which extend from the stator coil slots. The air gap baffle assembly of the present invention effectively seals the high pressure zone of the exciter end of the generator, from the lower pressure radial air gap zone located between the generator rotor and stator, to thereby force cooling gas to flow into the rotor and stator.

Abstract: An optically commutated dc motor which includes an optically encoded disk mounted on the permanent magnet rotor shaft and the encoding consists of a repeated graphics representation of the desired stator-field force strength. Optical detectors are employed to create an opto-electrical signal of sinusoidal form which is amplified and placed across the stator windings.

Abstract: An a.c. generator having a stator including an armature core and a polyphase output winding wound around the armature core. A plurality of rotors mounted on a rotary shaft to establish a first and a second field magnetic circuits are arranged in parallel with respect to the armature core. The first field magnetic circuit includes permanent magnets acting as a source of exciting magnetomotive force, while the second field magnetic circuit includes a field winding acting as a source of exciting magnetomotive force. The magnetic fluxes generated from the first and second field magnetic circuits penetrate the armature core inducing an output voltage across the polyphase output winding. The magnetic flux from the second field magnetic circuit is changed so as to increase or decrease the total magnetic flux penetrating the armature core thereby controlling the induced output voltage.

Abstract: An actuator for tilting the plane of an object is constructed from a stack of piezoelectric or electrostrictive members. First alternate interstices between the members are filled with a first conductive material, except that a first gap remains between the material and one side of the stack. Similarly, second alternate interstices between the members are filled with a second conductive material, except that a second gap remains between the material and an opposite side of the stack. The first gap and the second gap have unequal depth into the stack. The first material in the first interstices is coupled in common and the second material in the second interstices is coupled in common. A voltage applied between the first material and the second material will thereby cause the stack to bend, thereby tilting the plane of the op of the stack.

Abstract: A laminated stator assembly for an electric motor includes plate laminations which have square-trimmed edge segments separated by circular peripheral edge sectors, which plates are randomly oriented in assembling the stator to provide a generally cylindrical outer surface. In this manner, the stator can be enclosed in and supported by an outer motor shell or housing which is substantially thinner and less expensive. The stator assembly of the present invention enjoys the material savings and enhanced air cooling characteristics of prior art stator constructions utilizing square-trimmed laminations, but eliminates the detrimental aspects of difficult alignment and heavier motor housings. In addition, overall stator assembly is substantially simplified.

Abstract: A brushless motor improving the structure for connecting the stator coil to the substrate to facilitate the operation of connection and assembling. The constitution comprises a rotor having a rotor magnet (11), a stator core (2) on which the stator coil (7) is wound to be opposed to the rotor magnet (11), a circuit substrate (4) connected to the stator coil (7), and an insulating core holder (3) which holds a terminal to which the coil will be connected and which mounts the stator core (2), the core holder (3) being placed on said circuit substrate (4) and said terminal being soldered to terminal portions on the circuit substrate (4).

Abstract: In an electric motor, a springy disk with internal projections is used to position the iron stator plates of an electric motor by engagement with a soft material of the electric motor bearing support part. The disk is thus fixed with plates of the stator to align the stator plates with the support tube. The disk can be held between an end plate of the stator and the iron plates by windings of the motor. The disk can have tabs or ribs to align the plates properly or can have a pole configuration similar to the plates themselves. Indexing ribs can be located between the disks and the support plate.

Abstract: An axial pole stepping motor having a stator assembly on one or both sides of a disc-shaped rotor and including a plurality of teeth extending parallel to the rotational axis of the motor's drive shaft with the teeth arranged into at least two groups and evenly spaced within each of the two groups such that the teeth of each group may be axially aligned with the north-south poles of the permanent magnets evenly spaced about the circumference of the rotor. The two groups of teeth are circumferentially offset from each other such that the teeth of both groups cannot be simultaneously aligned with the north-south poles of the rotor. The circumferential offsetting of the two groups defines a stepping angle for the rotation of the motor shaft. A continuous skein winding woven in a labyrinth pattern between and among the teeth of each group transforms the teeth into salient poles. The windings may be energized in several modes.

Abstract: An independent-drive wheel for electric cars, bicycles, and wheelchairs wherein electromagnets 14,15 of rotor 12 of a commutator motor are positioned along a circumference in the form of a pair of groups which are offset with respect to each other, and wherein distribution commutator 6 of stator 9 electrically connected to electric energy storage device 32 is constructed in such a manner that when magnetic axes 17,18 of electromagnets of one group and magnetic members 11 of the stator are aligned, electromagnets 14 are connected to electric energy storage device 32, and when magnetic axes 19,18 of electromagnets 15 of the second group and of respective magnetic members 11 of stator 9 are not aligned, these electromagnets 15 are connected to voltage control unit 36.

Abstract: An adjustable-brush motor incorporates an integral stepping motor or servo to electromechanically adjust the commutating angle of the primary brushes by input of an electrical signal, and to maintain a predetermined commutating angle in the absence of an electrical signal. The adjustment is in accordance with load changes to reduce sparking, to upgrade the electromechanical conversion efficiency of the motor, and to reverse the direction of rotation.

Abstract: A piezoelectric actuator includes a pair of piezoelectric members which are oriented to shear laterally toward each other in the presence of an applied voltage. A hinge having translational members (which act similarly to a rack) and a rotating member (which acts similarly to a pinion) is attached to the top of the piezoelectric members with one translational attached to a respective one of the piezoelectric members. A driven member attached radially outward from the rotating member will then move through an arc when the piezoelectric members laterally shear. An object, such as a mirror, when carried by the distal end of the driven member, will then be actuated.

Abstract: The motor constituted, inter alia, by commutation means (40) with a connector (41) constituted by an insulating support (410) intended to be carried by the armature (30), and by conducting contactors (411) equipped with terminals (412) in order to receive the ends (321) of the wires (320) of the windings (32) of the armature (30) and with contacts (413) intended to make contact with each of the corresponding counter-contacts (413') of a printed circuit (421) is characterized in that the insulating support (410) carries at its periphery (4101) a median ring (4102) edged on either side with lateral borders (4103) of lesser diameter, and in that this ring (4102) is caused to form teeth (4104) whose profile (4106), at least close to the bottom (4107) of each space width (4108) which separates them, exhibits a recessed portion (4105), in that each border (4103) is provided with notches (4109) disposed in vertical line with the teeth (4104), in that the terminals (412) and the contacts (413) are joined together by

Abstract: The invention relates to a fan for an electrically operated machine, comprising a propeller (1) arranged axially about the machine and including a hub (8) and several blades attached to it and projecting substantially radially from it; and a cover (2) surrounding the propeller (1) in the front and on the sides and comprising a suction opening (3) on the suction side of the propeller (1) and an opening (7) on the pressure side for passing ventilation air into the machine parts to be cooled. To achieve a fan of simple construction, good efficiency and low noise level the blades (9) have a radius of curvature (R) and they are attached to the hub (8) at a blade angle (.alpha.) between 25.degree. and 70.degree.; a gap (S) defined between the suction opening (3) or its cylindrical extension (5) and the blades (9) of the propeller (1) in the axial direction is no more than 20% of the outer diameter of the propeller (1); the inner diameter (D.sub.A ) of the suction opening (3) before the propeller (1) is 0.8 to 1.

Abstract: The present invention provides an improved rotor and end connector for an induction motor. The end connector adjoins a rotor core. The rotor core includes a plurality of spaced ventilation openings and defines an aperture for capturing a motor shaft. The end connector should preferably surround and be concentric with the inner ventilation openings. To increase ventilation efficiency, the end connector has a plurality of spaced fan blades. Each of the fan blades has a sloping inner surface and backward curving outer surface. The backward curving outer surface is substantially perpendicular to the end connector, and directs air flow radially outward.