Abstract: A small sized electric motor of a sectionally non-circular housing has a pair of magnets oppositely positioned therein in the lengthwise direction thereof and a rotor positioned between the magnets. A pair of fulcrums oppositely located on the housing in the length-wise direction thereof diametrically across the rotor, and a pair of elongated brushes, each has one end part secured to each of the fulcrums and the other end part elastically pressed against the commutator of the rotor at a point thereof to determine the electric displacement point with the angle 120.degree. displaced with respect to the magnetic line of force caused by the magnets. A winding is wound around the core structure of the rotor and has the initial ends and the wound ends each connected to a predetermined number of connector terminals of the commutator with the angle 120.degree. displaced with respect to the commutator.

Abstract: A direct current electric motor is described, which substantially comprises a permanent magnet having a plurality of N-magnetic poles and a plurality of S-magnetic poles, the N and S-magnetic poles being alternately arranged adjacent to each other, each defining a magnetic range of its own; phase coil means including a first phase coil and a second phase coil, each being composed of a plurality of groups of conductors, the conductors being extended substantially in parallel with each other, the first and second coils being displaced by a half range of a single magnetic pole of the permanent magnet, such that each group of conductors of the first phase coil and each group of conductors of the second phase coil may be alternately disposed adjacent to each other, one being disposed in one half of the magnetic range and the other being disposed in the other half thereof; and magnetism detector means including a first magnetism detector and a second magnetism detector, the first magnetism detector being connected

Abstract: A small sized fan motor is disclosed, wherein an armature is supported by a disk-shaped support in a cantilever fashion, a rotor has an outer periphery for fixedly mounting a fan having a plurality of blades thereon and an inner periphery for fixedly mounting a permanent magnet thereon in a manner that the permanent magnet surrounds the armature with a clearance being provided therebetween, and a rotational bearing having an inner race secured to the disk-shaped support and an outer race secured to the inner periphery of the rotor in a manner that the rotational bearing is arranged coaxial with the permanent magnet within the rotor.

Abstract: The invention relates to an electric motor having armature means including a plurality of armature segments each rendered into a flat form and arranged in a same plane around a center rotation axis in a manner as to form a circular outline; magnet means including a plurality of permanent magnet segments arranged in a same plane opposite to the armature segments coaxially on one side thereof with an air gap being provided therebetween, each of the permanent magnet segments having end portions in the radial direction defined by a geometrical line dividing the permanent magnet segments one from another, the dividing line being designed to extend in avoidance to be in parallel with a normal extended from the center rotation axis of the armature segments, said dividing line of each permanent magnet segment extending in parallel with another dividing line of the adjacent magnet segment to provide therebetween a groove of a predetermined width.

Abstract: An electric motor has in combination a rotor having two permanent magnets of different polarities, two Hall generators responsive to the magnetic fluxes generated from the respective permanent magnets to produce different electric signals, two comparator circuits each arranged in combination with each of the Hall generators and operated in response to the resultant outputs, a logic circuit operated in response to the outputs of the comparators to produce the resultant outputs and a 3-phase inverter circuit having first, second and third stages each having two inputs and one output, the inputs of the first stage being connected to the outputs of one of the comparator circuits, the inputs of the second stage being connected to the outputs of the other of the comparator circuits and the inputs of the third stage being connected to the outputs of the logic circuit, the first, second and third stages having the outputs connected respectively to the delta connection points of coils wound around the electrodes of ar

Abstract: An electric rotary device of permanent magnet type has a stator including a plurality of permanent magnets and a rotor rotatably mounted within the stator and including an armature core and a plurality of windings wound around the armature core, said permanent magnets each having an axial length in the direction of the central rotation axis of the rotor, said axial length being a maximum at the center of the permanent magnet and progressively reduced towards both side ends of the permanent magnet.