Abstract: A 1-phase energized disk-type brushless motor or fan motor comprises a single position detecting element located at a position on a printed circuit board corresponding to one of magnetically active conductor portions of one of stator coils of the stator armature. The magnetically active conductor portions include a width substantially equal to the width of each pole of the magnet rotor. A cogging generating magnetic member or plate having a width substantially equal to the pole width is located on the printed circuit board such that it is spaced by about three fourths of the pole width from one of the conductor portions of one of the stator coils so that the magnet rotor may stop with one pole thereof just opposed to the magnetic member, thereby assuring self-starting of the motor and uniform turning torque over the entire rotation of the motor.

Abstract: A single-phase brushless motor which can rotate smoothly by a uniform torque over an entire range of rotation with reduced torque ripples, without generating a high cogging torque for allowing self-starting of the motor. The motor comprises a field magnet as a rotor having 2P north and south magnetic poles, either the north or the south poles having a width equal to an electrical angle of about 120 degrees while the other poles have a width equal to an electrical of about 240 degrees. The field magnet is mounted for rotation in an opposing relationship to a stator armature core which has a plurality of radially extending stator poles formed in a circumferentially equidistantly spaced relationship thereon. A plurality of stator coils for two phases are wound selectively on the stator poles. An electric circuit detects the position of the field magnet to energize the armature coils for the two phases alternately for an electric angle of about 180 degrees.

Abstract: A 1-phase coreless disk-type brushless motor or axial-flow brushless fan motor comprises a single position-detecting element located at a position on a printed circuit board corresponding to one of the magnetically active conductor portions of a stator coil or coils of the stator armature. A cogging-generating stator yoke having a cutaway portion of a specifically determined angular width is positioned relative to the stator coils, such that an end of the cutaway portion thereof is spaced by a distance equal to about one fourth of the pole width from another magnetically active conductor portion of the stator coils, so that the magnet rotor may stop at a position from which the motor can start itself. Various forms of such cogging generating stator yoke are disclosed, including a stator yoke which also serves as a circuit board.

Abstract: A 1-phase brushless motor comprises a single position-detecting element located at a stationary position corresponding to a magnetically active conductor portion of an armature coil of an armature member. The position-detecting element is either a magnetoelectric transducer or a position-detecting coil. A plastics magnet is molded integrally with the armature coil and is magnetized such that it cooperates with a field magnet as a rotor to generate a field magnet attracting and repulsing torque within a particular range from a dead point, so as to stop the field magnet at a position from which the motor can start itself.

Abstract: A 1-phase coreless disk-type brushless motor comprises a single position-detecting element located at a stationary position corresponding to a magnetically active conductor portion of an armature coil or coils on a stator yoke. A cogging-generating magnetic element having a width substantially equal to the width of each pole of a field magnet is located such that the center radial line between the width thereof is spaced by a distance equal to about three fourths of the pole width from another magnetically active conductor portion of the armature coil or coils so that the magnet rotor may stop at a position from which the motor can start itself.

Abstract: A 1-phase disk-type brushless motor comprises a cogging-generating magnetic member or plate having a width substantially equal to the width of each pole of a magnet rotor and located at a specific position on a stationary printed circuit board so that the magnet rotor may stop with one pole thereof just opposed to the magnetic member, thereby assuring self-starting of the motor. The cogging generating magnetic member is shaped such that the volume or area may gradually decrease forwardly relative to the direction of rotation of the motor so that the cogging torque generated by the magnetic member may gradually increase upon starting of the motor, thereby assuring smooth rotation of the motor.

Abstract: A single-phase brushless motor which can rotate smoothly with minimized torque ripples without generating a cogging torque. A magnet rotor of the motor has north and south magnetic pole and non-magnetized zones successively formed in ranges thereof each having an angular width of 120 degrees in electrical angle, and a stator armature is mounted in an opposing relationship to the magnet rotor and includes an annular stator yoke on which a same number of stator coils for each of 3 phases are wound in a troidal configuration and successively located in an angularly spaced relationship by an electrical angle of 120 degrees. A position detecting element is located for detecting a magnetic pole or non-magnetized portion of the magnet rotor, and in response to signals successively developed from the position detecting element during rotation of the magnet rotor, an energization controlling circuit successively energizes the stator coils to rotate the magnet rotor in a predetermined direction.

Abstract: A disk-shaped and coreless type electric motor for controlling the tilt of a throttle valve. The motor includes a field magnet having at least one pair of N and S poles and a stator armature having at least one set of coils disposed in face-to-face confronting relation to the magnet. The shaft of the motor is coupled directly to the shaft carrying the throttle valve, the latter shaft being urged by a spring toward a position where the valve throttles off the passage of air. The coil is so positioned relatively to the N and S poles of the magnet that when the coil is excited, any conductor portions thereof can act effectively to develop torque to rotate the magnet.

Abstract: An electric motor for controlling the tilt of a throttle valve is disclosed. A rotatable field magnet having at least two pairs of N and S poles is mounted on a rotary shaft carrying the throttle valve for rotation relative to a disk-shaped stator yoke having at least one armature coil formed therearound. The coil includes a first toroidal windings of conductor effective for the development of torque wound in one direction and a second toroidal windings of conductor similarly effective for the development of torque wound in the other direction and disposed away from said first toroidal windings of conductor circumferentially of the stator yoke at an angular interval which is equal to about 2n-1 times the pole-to-pole interval of said magnet, said first and second windings being electrically connected to each other. The first and second windings of conductor are phase shifted in spaced-apart relation to each other.

Abstract: A direct current motor comprising a field magnet with 2np magnetic poles, magnetized to N and S poles with equal angular intervals, where n is an integer of 1 or more and p is an integer of 2 or more; a magnetic member for closing the magnetic circuit of the magnetic circuit of the magnetic poles of the field magnet; n(py.+-.1) armature coils disposed in such a manner that the angular intervals of the electrically conductive portions of the armature coils, contributing to the generation of torque in the armature coils, are substantially equal to the magnetic pole width of the field magnet, where y is an integer of 3 or more; a wave-winding-type armature on which the armature coils are disposed, overlapping on each other, with an equal pitch, the wave-winding-type armature being directed towards the field magnet within the magnetic circuit; electric power supply control device for commutating the commutator current np(py.+-.1) times or 2np(py.+-.

Abstract: A disk type motor speed detecting device is made up of a doughnut shaped plate high in magnetic permeability secured to the inner surface of the lower plate of the body, a coil wound on a small portion of the doughnut shaped plate; a doughnut shaped magnet with S and N poles one of which has a magnetization angle of more than 180.degree., a disk-shaped yoke secured to the magnet, and a rotary shaft adapted to rotate the magnet relative to the doughnut shaped plate.

Abstract: A direct current motor comprises a field magnet having 2 mn magnetic poles magnetized with the same angular intervals as those of the magnetic poles N and S, where m is an integer of 1 or more, and n is an integer of 4 or more, a magnetic member for closing the magnetic circuit of the magnetic poles of the field magnet, an armature in which m(2n.+-.n) armature coils are arranged each magnetically with a phase angle of 360/(2n.+-.2) degrees, the armature being directed towards the magnetic poles in the magnetic circuit, electric power supply control means for performing the switching of an armature current mn(2n.+-.2) times per revolution of the armature with respect to the field magnet, and a rotating shaft for rotatably supporting the armature or the field magnet, the rotating shaft being supported by a bearing disposed in an outer casing of the direct current motor.

Abstract: A direct current motor comprising a field magnet provided with 2 mn magnetic poles which are magnetized with the same angular intervals as those of the magnetic poles N and S, where m is an integer of 1 or more, and n is an integer of 3 or more; a magnetic member for closing the magnetic circuit of the magnetic poles of the field magnet; an armature in which m(2n.+-.1) armature coils are arranged with an equal pitch, the armature being directed towards the magnetic poles in the magnetic circuit; electric power supply control device capable of performing the switching of armature current 2 mn (2n.+-.1) times per revolution of the armature; and a rotating shaft for rotatably supporting the armature and one of the magnetic poles, the rotating shaft supported by a bearing disposed in an outer casing of the direct current motor.

Abstract: A direct current motor comprising a field magnet provided with 2n magnetic poles which are magnetized with the same angular intervals as those of the magnetic poles N and S, where n is an integer of 1 or more; a magnetic member for closing the magnetic circuit of the magnetic poles of the field magnet; a plurality of armature coils in such a manner that the angular intervals of the electrically conductive portions thereof, contributing to the generation of torque in the armature coils, are substantially equal to the magnetic pole width of the field magnet; electric power supply control device to which the terminals of the armature coils are connected; short-circuit members for short-circuiting the winding initiation terminals of predetermined armature coils and the winding end terminals of other predetermined armature coils through the electric power supply control device; an armature comprising armature coils in the first series and armature coils in the second series through which the short-circuit members

Abstract: A direct current motor comprising the field magnet pole of a permanent magnet and an armature having a plurality of armature windings. The field magnet pole has at least four magnetic poles and the angular spacing is equal to 360 degrees divided by the number of the magnetic poles, and at least one of the armature windings has an angular spacing which is (2n - 1) times the width of the field magnet pole, where n is a positive integer of 2 or more, and control means for successive switching, rendering said armature windings conductive, is provided.

Abstract: A direct current motor is provided with a field magnet having 4 mn alternating N and S poles (m being a positive integer of one or more and n being a positive integer of two or more) that are magnetized within segments of equi-angular width about the field magnet, a magnetic-material member for closing the magnetic path of the field magnet, and a rotatably mounted armature having m (2n-1) armature windings equally distributed thereabout in a non-superposed manner with respect to each other and in a face-to-face relationship with respect to the field magnet poles, each winding having an angular spacing between those conductor portions thereof that contribute to the generation of the torque that is equal to the angular width of the field magnet poles.

Abstract: A direct current motor is provided with a field magnet having l(2m+2n) alternating N and S poles (l and m being positive integers of one or more and n being a positive integer of two or more) that are magnetized within segments of equiangular width about the field magnet, a magnetic-material member for closing the magnetic path of the field magnet, and an armature having 2ln armature windings distributed thereon in a non-superposed manner with respect to each other and in a face-to-face relationship with respect to the field magnet poles, each winding having an angular spacing between those conductor portions thereof that contribute to the generation of the torque that is equal to the angular width of a field magnet pole.

Abstract: A direct current motor is provided with a field magnet having l(2m+2n) alternating N and S poles (l and m being positive integers of one or more and n being a positive integer of two or more) that are magnetized within segments of equiangular width about the field magnet, a magnetic-material member for closing the magnetic path of the field magnet, and an armature having l(2n-1) armature windings distributed thereon in a non-superposed manner with respect to each other and in a face-to-face relationship with respect to the field magnet poles, each winding having an angular spacing between those conductor portions thereof that contribute to the generation of the torque that is equal to the angular width of a field magnet pole.

Abstract: A direct current motor is provided with a field magnet having 4 mn alternating N and S poles (m being a positive integer of one or more and n being a positive integer of two or more) that are magnetized within segments of equi-angular width about the field magnet, a magnetic-material member for closing the magnetic path of the field magnet, and a rotatably mounted armature having m(2n+1) armature windings equally distributed thereabout in a non-superposed manner with respect to each other and in a face-to-face relationship with respect to the field magnet poles, each winding having an angular spacing between those conductor portions thereof that contribute to the generation of the torque that is equal to the angular width of the field magnet poles.

Abstract: A coreless three-phase DC motor comprising a coil type armature formed with insulated windings. The armature is of a disc- or cylindrical-shape and is set rotatably against a field magnet provided with 2n magnetic poles N and S magnetized in equal angular widths. On the surface of the armature there are 3n/2 three-phase armature coils, wherein the angular width of each of the coils is equal to the width of the field magnet pole, the coils of each phase are shifted by 180.degree. of electrical angle from each other, and all the armature coils are arranged at equal angular intervals and not superimposedly with respect to one another.