Disc type brushless motor

Claim 2

A disc type brushless motor comprising a rotor means provided with a 2 m-pole field magnet consisting of north and south poles alternately positioned, wherein m designates a positive integer of 1 or larger, and a stator means provided with loop-like armature power windings in which the angle between the radial conductor sections of each armature power winding is approximately equal to the pole width of said field magnet, said armature power windings being flatly positioned opposite to said field magnet in quantity of two or more in the circumferential direction of said stator means and in two stages or more in the radial direction thereof, said stator means being also provided with position detecting elements for detecting said poles of said field magnet.

Claim 3

A motor as defined in claim 1 wherein each set of the outer and inner armature power windings are positionally shifted with respect to each other in the circumferential direction of said stator means.

Claim 4

A motor as defined in claim 1 wherein the sets of the outer and inner armature power windings do not overlap one upon the other in the radial direction of said stator means.

Claim 5

A motor as defined in claim 1 wherein the outer armature power windings are looped more turns than the inner armature power windings.

Claim 6

A motor as defined in claim 1 wherein the armature power windings are positioned at equal intervals in the circumferential direction so that they do not overlap one upon another in the circumferential direction of said stator means.

Claim 7

A motor as defined in claim 1 wherein the armature power windings are in the fan loop-like form.

Claim 8

A motor as defined in claim 1 wherein the armature power windings are in the square loop-like form.

Claim 9

A motor as defined in claim 1 wherein seven or more armature power windings are positioned in the circumferential direction of said stator means, and one terminal of each armature power winding is connected to a common line.

Claim 10

A motor as defined in claim 8 wherein the other terminal of each armature power winding is connected to a semiconductor rectifier.

Claim 11

A motor as defined in claim 1 wherein a field magnet is flatly secured to either surface of a disc-like yoke which is made of a magnetic material and secured at right angles to a rotatably supported rotating shaft, and two groups of the armature power windings are opposed one to the field magnet on each surfaces of said yoke.

Claim 12

A motor as defined in claim 1 wherein each pole of said field magnet consists of a plurality of field magnet segments positioned within a pole width equal to the angle calculated by dividing the circumference of said field magnet by 2 m, wherein m designates a positive integer of 1 or larger.

Claim 13

A motor as defined in claim 11 wherein said field magnet segments are in the fan-like plate form.

Claim 14

A motor as defined in claim 11 wherein said field magnet segments are in the square plate form.

Claim 15

A motor as defined in any of claims 11 to 13 wherein the outer field magnet segments have a stronger magnetic force than the inner ones.

Claim 16

A motor as defined in claim 1 wherein one position detecting element is provided for each armature power winding.

Claim 17

An image scanning system comprising a main scanning means for scanning an image recording or image bearing medium in one direction repeatedly at a high speed with a light beam and a sub-scanning means for moving said medium in a direction perpendicular to said direction at a comparatively low speed, whereby scanning the medium two-dimensionally, wherein said sub-scanning means comprises the motor as defined in claim 1.

Claim 18

A disc type brushless motor comprising a rotor means provided with a 2 m-pole field magnet consisting of north and south poles alternatively positioned, wherein m designates a positive integer of 1 or larger, and a stator means provided with loop-like armature windings in which the angle between the radial conductor sections of each armature winding is approximately equal to the pole width of said field magnet, said armature windings being flatly positioned opposite to said field magnet in quantity of two or more in the circumferential direction of said stator means and in two stages or more in the radial direction thereof, and wherein the outer armature windings are looped more turns than the inner armature windings, said stator means being also provided with position detecting elements for detecting said poles of said field magnet.

Claim 19

A disc type brushless motor comprising a rotor means provided with a 2 m-pole field magnet consisting of north and south poles alternatively positioned, wherein m designates a positive integer of 1 or larger, and a stator means provided with loop-like armature windings in which the angle between the radial conductor sections of each armature winding is approximately equal to the pole width of said field magnet, said armature windings being flatly positioned opposite to said field magnet in quantity of two or more in the circumferential direction of said stator means and in two stages or more in the radial direction thereof, and wherein the outer armature windings are looped more turns than the inner armature windings, said stator means being also provided with position detecting elements for detecting said poles of said field magnet.

Claim 20

A disc type brushless motor comprising a rotor means provided with a 2 m-pole field magnet consisting of north and south poles alternately positioned, wherein m designates a positive integer of 1 or larger, and a stator means provided with loop-like armature windings in which the angle between the radial conductor sections of each armature winding is approximately equal to the pole width of said field magnet, said armature windings being flatly positioned opposite to said field magnet in quanitty of two or more in the circumferential direction of said stator means and in two stages or more in the radial direction thereof, and wherein the outer field magnet segments have a stronger magnetic force than the inner ones, said stator means being also provided with position detecting elements for detecting said poles of said field magnet.

Claim 21

A disc type brushless motor comprising a rotor means provided with a 2 m-pole field magnet consisting of north and south poles alternately positioned, wherein m designates a positive integer of 1 or larger, and a stator means provided with loop-like armature windings in which the angle between the radial conductor sections of each armature winding is approximately equal to the pole width of said field magnet, said armature windings being flatly positioned opposite to said field magnet in quanitty of two or more in the circumferential direction of said stator means and in two stages or more in the radial direction thereof, and wherein the outer field magnet segments have a stronger magnetic force than the inner ones, said stator means being also provided with position detecting elements for detecting said poles of said field magnet.

Claim 22

An image scanning system comprising a main scanning means for scanning an image recording or image bearing medium in one direction repeatedly at a high speed with a light beam and a sub-scanning means for moving said medium in a direction perpendicular to said direction at a comparatively low speed, whereby scanning the medium two-dimensionally, wherein said sub-scanning means comprises a disc type brushless motor comprising a rotor means provided with a 2 m-pole field magnet consisting of north and south poles alternately positioned, wherein m designates a positive integer of 1 or larger, and a stator means provided with loop-like armature windings in which the angle between the radial conductor sections of each armature winding is approximately equal to the pole width of said field magnet, said armature windings being flatly positioned opposite to said field magnet in quantity of two or more in the circumferential direction of said stator means and in two stages or more in the radial direction thereof, said stator means being also provided with position detecting elements for detecting said poles of said field magnet.

Claim 23

An image scanning system comprising a main scanning means for scanning an image recording or image bearing medium in one direction repeatedly at a high speed with a light beam and a sub-scanning means for moving said medium in a direction perpendicular to said direction at a comparatively low speed, whereby scanning the medium two-dimensionally, wherein said sub-scanning means comprises a disc type brushless motor comprising a rotor means provided with a 2 m-pole field magnet consisting of north and south poles alternately positioned, wherein m designates a positive integer of 1 or larger, and a stator means provided with loop-like armature windings in which the angle between the radial conductor sections of each armature winding is approximately equal to the pole width of said field magnet, said armature windings being flatly positioned opposite to said field magnet in quantity of two or more in the circumferential direction of said stator means and in two stages or more in the radial direction thereof, said stator means being also provided with position detecting elements for detecting said poles of said field magnet.