Canon Kabushiki Kaisha

Canon Seiki Kabushiki Kaisha

Kanemasa Aoki

An electric motor which achieves reduced axial height by an arrangement of a motor case which mounts an outer field magnet and which also rotatably supports a motor shaft. A cup shaped yoke fixed to the shaft supports a rotor core and coil. A commutator is mounted on the yoke and is contacted by brushes fixed to a resin member embedded in an aperture formed in the motor case.

Motor

A motor having a rotary shaft, a coil wound on an iron core fixed to the rotary shaft, a yoke member, a magnetic flux producing member and commutator means has its yoke member constructed with yoke supporting portions serving as a magnetic path of magnetic flux and four magnetic poles having substantially arcuate shape. Each magnetic pole has a largest dimension of thickness at a center portion thereof and extends outwardly with gradually reduced thickness in accordance with the distance from the central portion. Ends of each magnetic pole respectively oppose corresponding ends of the adjacent magnetic poles with a slight distance therebetween, with the magnetic poles surrounding an outer periphery of the iron core. The magnetic flux producing member includes two rectangular parallelepiped blocks. The motor forms a shape approximate to a rectangle or a square by the two blocks and the four poles and supporting portions, wherein a dimension of thickness of the whole motor is set to a value near a dimension of an outer diameter of the iron core.

A DC cored motor in which the rotor core has an odd number of slots to accept a corresponding number of coils which are connected to a commutator with a doubled number of segments, characterized by a combination of 2n+1 slots with 2n magnetic poles in the field magnet, wherein n is an integer equal to or larger than 2.

DC motor

The present invention relates to a rotary electric machine of the type in which a coreless rotary coil having an end connection only at its one side end is mounted on a shaft rotatably within the magnetic field of a stator field magnet and is directed to a novel design for making such type of rotary electric machine flattened in form. According to the present invention a flat shaped coreless electric machine is provided by arranging the commutator of the rotary machine within an open side part opposed to the end connection of the coreless rotary coil.

Flat type coreless rotary electric machine

A coreless rotary electric appliance comprising a rotary coil of a cup-shaped coil body open at an end face thereof which is composed of inclined coil wire portions wound with a determined angle along the cylindrical periphery of said coil body and of end connecting wire portions arranged on one end face of said coil body to connect said coil wire portions in succession whereby said coil body being formed by a continuous wire composed of said coil wire portions connected in succession by said end connecting portions, whereby said coil body being featured by an asymmetrical structure that two coil wire portions connected to both ends of each end connecting wire portion and wound along the cylindrical periphery of said coil body are provided with different inclination angles with respect to the generatrix of said cylindrical surface of the coil body.

Winding for small rotary electric double air gap motor

The present invention relates to a miniature rotary electric machine and more particularly to a coreless type of rotary electric machine. The coreless rotary electric machine includes a rotor coil formed as a coil body in a form of cup with its one end being open. The coil body has, on its circumference, a coil part wound with a predetermined inclination. An end connection wire part is provided to make a connection between adjacent windings only at the one side end of the inclined coil part so that each two adjacent windings of the inclined coil part are connected each other successively by the end connection wire part. According to a feature of the present invention, the inclined coil part and the end connection wire part are formed by coil assembly portions each comprising a plural number of groups of windings turned at the same position in layers with the same number of turns. The coil assembly portions form together a coil assembly of large winding capacity.

Miniature rotary electric machine

An improvement in DC rotary machine is disclosed. The stationary field yoke of the DC rotary machine has a cylindrical field member and a cylindrical bearing member of a smaller diameter than that of the field member. These members are made of oil-containing sintered alloy as a unitary member. The inner cylindrical surface of the bearing part of the stationary field yoke supports a rotary shaft rotatably therein. A motor coil assembly in a shape of cup is fixedly mounted on the rotary shaft. A generator coil assembly is also formed in a shape of cup which has a central opening in the botton wall of the cup. The diameter of the central opening is approximately equal to the outer diameter of the bearing part of the stationary field yoke. The open end of the cup like generator coil assembly is disposed in opposition to the open end of the cup like motor coil assembly and these two open ends in opposition to each other are jointed together with the interposition of an insulating element therebetween so as to form a rotary coil unit which encloses the field part of the field yoke. A commutator for generator is formed in a shape of cylinder the inner diameter of which is larger than the outer diameter of the bearing member of the field yoke and the commutator is secured to the generator coil assembly keeping a spacing between the commutator and the bearing member.

DC rotary machine

An improved frequency generator is disclosed. The frequency generator includes such a permanent magnet that is magnetized in the direction of the axis of a rotary shaft with which the rotor of the generator is rotated. Between the second magnetic pole side of the permanent magnet and the rotor, there is disposed a flanged cylindrical frame member comprising a flange part and a cylinder part. At the side of the second magnetic pole, the permanent magnet is connected with the flange part of the frame member. The cylinder part of the frame member is arranged so as to surround the circumferential surface of the rotor. The flanged cylindrical frame member disposed in this manner is magnetically conductive so that the area through which the magnetic flux flows between the second magnetic pole side of the permanent magnet and the rotor is effectively increased as compared with the conventional one.

Frequency generator and miniature motor provided with the same

An electric motor of a construction, wherein conductive wires are wound around the outer periphery of an armature core substantially in parallel with a rotor shaft and in such a manner that the terminal connection part of the winding may be provided in the axial direction of the rotor shaft, and, at the same time, a commutator is disposed inwardly at a position nearer to the core than the projected end of the terminal connection part of the winding which projects outwardly in the same direction as the axial direction of the core, whereby the length of the rotary armature in the axial direction thereof is shortened to flatten the motor per se in the axial direction thereof.

Electric motor

A flattened DC motor, in which a rotary armature having a coil assembly comprising a combination of at least two disc-shaped coils, each having radial segments, is disposed in the field of a fixed field permanent magnet. The brushes are in contact with an area of a cylindrical commutator where the fixed field permanent magnet overlaps, the commutator being electrically connected to the coil assembly and secured on the rotary shaft.

A small-sized direct current rotary electric appliance comprises a stator provided with a cylindrically shaped permanent magnet. A rotary armature rotates in the magnetic field of said permanent magnet, and brushes are fixedly provided on a part of said stator. The rotary armature is constructed with a rotor shaft, a soft magnetic core being fixedly provided on the rotor shaft with a plurality of winding continuously wound for a predetermined number of turns around the core in such a way that the portions of the windings located at both end surfaces of the core in the axial direction thereof constitute terminal connections. The portions located on the periphery of the core in the axial direction thereof are substantially parallel to the rotor shaft, and a disc-shaped commutator plate is disposed in at least one of recesses formed at both end surface parts of the core in its axial direction by both end surfaces of the core in its axial direction and with the terminal connections of the windings raised above both end surfaces. The commutator plate is fixedly provided on the rotor shaft so as to be substantially perpendicular thereto. The brushes are each formed of an integral structure consisting of a first spring element in a right-angled U-shape and a second spring element supporting the first spring element approximately at the middle of the parallel arm portions thereof, the open ends of the first spring element forming contact points, and the ends of the second spring element opposite to the above-mentioned supporting ends forming the securing ends therefor.

Growing community of inventors

Yokohama, Japan

Kanemasa Aoki