US 2004/0164638 A1 · Coreless motor

Abstract

To realize a small-sized coreless motor featuring excellence in responsiveness and controllability, capability of obtaining greater rotating torque compared with driving power supplied to the coil, great intensity, ease in assembly and high energy efficiency, a coreless motor of the present invention comprising; each of coils 8, 8 comprises a flat portion, which consists of a winding unit that confronts the upper and lower faces of a ring-shaped magnet 5 and whose plane part forms an arc shape, and a curved-and-folded portion, which consists of a winding unit that confronts the external circumstance side face of the magnet, with the section from one end of the lead wire constituting these winding units to the other end being arranged to compose a continuous, hollow unit; wherein the flat portion in the lower part of these coils 8, 8 is fitted to thin-sheet-shaped flange 9a below coil holder 9, which is installed around the rotating axis 4, so that multiple coils are arranged along the external circumference direction of the magnet, and to the flat portions on the upper side of the coils 8, 8, thin/round annulus upper-side reinforcing plates 15 are attached.

Claims10

Dependent claims

A coreless motor comprising:

a ring-shaped coil yoke fitted to the interior of a casing, which has a conductive-use coil connected to a ring-shaped magnet, whose external circumference face stands opposed to the internal circumference face of the coil yoke, and the coil designed to revolve jointly with the rotating axis following power input to the said coil;
wherein the said coil confronts the upper and lower faces of the magnet and consists of a flat portion whose plane part takes an arc form and of a curved-and-folded portion composed of a winding unit confronting the external circumference side face of the magnet, while the section from one end of the lead wire composing these winding units to its other end constitutes a continuous hollow unit;
wherein a thin-sheet-shaped flange is installed on the lower part of the coil holder fixed to the periphery of the said rotating axis, while multiple coils are attached so as to be arranged in line with the circumference direction of the magnet by fixing the flat portion on the lower side of each coil to the flange;
and
wherein thin/round annulus-shaped upper-side reinforcing plates are attached to the flat portion on the upper side of each coil.

2 more elements

A coreless motor comprising;

a ring-shaped coil yoke fitted to the interior of a casing, which has a conductive-use coil connected to a ring-shaped magnet, whose external circumference face stands opposed to the internal circumference face of the coil yoke, and the coil designed to revolve jointly with the rotating axis following power input to the said coil;
wherein the said coil confronts the upper and lower faces of the magnet and consists of a flat portion whose plane part takes an arc form and of a curved-and-folded portion composed of a winding unit confronting the external circumference side face of the magnet, while the section from one end of the lead wire composing these winding units to its other end constitutes a continuous hollow unit;
wherein the said magnet is 4-polar-magnetization arranged in the radius direction, and as for the coils mentioned above, 3 are installed around the rotating axis;
and
wherein for commutators fixed around the rotating axis, 6-segment ones are used, with 2 brushes set in positions each forming an angle of 90° in relation to the commutator.

2 more elements

A motor coreless comprising;

a ring-shaped coil yoke fitted to the interior of a casing, which has a conductive-use coil connected to a ring-shaped magnet, whose external circumference face stands opposed to the internal circumference face of the coil yoke, and the coil designed to revolve jointly with the rotating axis following power input to the said coil;
wherein the said coil confronts the upper and lower faces of the magnet and consists of a flat portion whose plane part takes an arc form and of a curved-and-folded portion composed of a winding unit confronting the external circumference side face of the magnet, while the section from one end of the lead wire composing these winding units to its other end constitutes a continuous hollow unit;
wherein the said magnet is 2-polar-magnetization arranged in the diameter direction, and as for the coils mentioned above, 3 are installed around the rotating axis;
and
wherein for commutators fixed around the rotating axis, 3-segment ones are used, with 2 brushes set in position parallel with each other in relation to the commutator.

2 more elements

Dependencies are inferred from the claim text.

Coreless motor

Life of this patent

Coreless motor

Life of this patent

Abstract

Claims10