US 6,255,749 B1Granted

Motor

AssigneesCanon Kabushiki Kaisha, Canon Denshi Kabushiki Kaisha

InventorsChikara Aoshima, Akira Kurosawa

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Abstract

A motor includes a magnet formed in a cylindrical shape and divided in the circumferential direction in at least the outer periphery and alternately polarized to different poles, a first coil, a magnet and a second coil placed in the axial direction of the magnet, a first outer magnetic pole opposed to the outer periphery of the magnet and a hollow-shaped first inner magnetic pole opposed to the inner periphery of the magnet, excited by the first coil respectively, a second outer magnetic pole opposed to the outer periphery of the magnet and a hollow-shaped second inner magnetic pole opposed to the inner periphery of the magnet, excited by the second coil respectively, a rotatable rotary shaft integral with the magnet, and a pressurizing device for pressurizing the rotary shaft in the axial direction, the pressurizing device being placed in the hollow cylindrical portion of the first inner magnetic pole. A motor having a high output, a compact shape and small working noises is provided.

Claims12

Dependent claims

A motor comprising:

a magnet formed in a cylindrical shape and alternately polarized to different poles in the circumferential direction in at least the outer periphery;
a first coil and a second coil provided in the axial direction of said magnet;
a first outer magnetic pole excited by said first coil, said first outer magnetic pole being opposed to an outer periphery of one end side of said magnet;
a hollow-shaped first inner magnetic pole excited by said first coil, said first inner magnetic pole being opposed to an inner periphery of one end side of said magnet;
a second outer magnetic pole excited by said second coil, said second outer magnetic pole being opposed to an outer periphery of the other end side of said magnet;
a hollow-shaped second inner magnetic pole excited by said second coil, said second inner magnetic pole being opposed to an inner periphery of the other end side of said magnet;
a rotatable rotary shaft integral with said magnet;
a first bearing portion provided in the hollow-shaped portion of said first inner magnetic pole and supporting one end side of said rotary shaft;
a second bearing portion for supporting the other end side of said rotary shaft projected in the axial direction beyond the hollow-shaped portion of said second inner magnetic pole;
and
a pressurizing means for pressurizing one end of said rotary shaft in the axial direction, said pressurizing means being provided in the hollow-shape portion of said first inner magnetic pole.

8 more elements

A motor comprising:

a magnet formed in a cylindrical shape and alternately polarized to different poles in the circumferential direction in at least the outer periphery;
a first coil and a second coil provided in the axial direction of said magnet;
a first outer magnetic pole excited by said first coil, said first outer magnetic pole being opposed to an outer periphery of one end side of said magnet;
a first inner magnetic pole excited by said first coil, said first inner magnetic pole being opposed to an inner periphery of one end side of said magnet;
a second outer magnetic pole excited by said second coil, said second outer magnetic pole being opposed to an outer periphery of the other end side of said magnet;
a second inner magnetic pole excited by said second coil, said second inner magnetic pole being opposed to an inner periphery of the other end side of said magnet, and said second inner magnetic pole and said first inner magnetic pole having a hollow-shaped portion in any one of said second inner magnetic pole and said first inner magnetic pole;
a rotatable rotary shaft integral with said magnet;
and
a pressurizing means for pressurizing said rotary shaft in the axial direction, said pressurizing means being provided in a hollow-shape portion of any one of said first inner magnetic pole and said second inner magnetic pole.

6 more elements

A motor comprising:

a magnet formed in a cylindrical shape and alternately polarized to different poles in the circumferential direction in at least the outer periphery;
a first coil and a second coil provided in the axial direction of said magnet;
a first outer magnetic pole excited by said first coil, said first outer magnetic pole being opposed to an outer periphery of one end side of said magnet;
a hollow-shaped first inner magnetic pole excited by said first coil, said first inner magnetic pole being opposed to an inner periphery of one end side of said magnet;
a second outer magnetic pole excited by said second coil, said second outer magnetic pole being opposed to an outer periphery of the other end side of said magnet;
a hollow-shaped second inner magnetic pole excited by said second coil, said second inner magnetic pole being opposed to an inner periphery of the other end side of said magnet;
a rotatable rotary shaft integral with said magnet;
a bearing portion provided in the hollow-shaped portion of said first inner magnetic pole and supporting said rotary shaft;
and
a pressurizing means for pressurizing said rotary shaft in the axial direction, said pressurizing means being provided in the hollow-shape portion of said first inner magnetic pole.

7 more elements

Dependencies are inferred from the claim text.

Facts

Application: 09/536,755Filed 28 Mar 2000
Priority: JP 11-08768030 Mar 1999
Granted: 3 Jul 2001
Term ends: Not estimatedThe source records don’t support an estimate.

Classification8 codes

H02K 5/1672
Using sliding-contact or spherical cap bearings: radially supporting the rotary shaft at both ends of the rotor
H02K 1/145
Stator cores with salient poles: having an annular coil, e.g. of the claw-pole type
H02K 1/2795
Rotors axially facing stators: the rotor consisting of two or more circumferentially positioned magnets
H02K 7/06
Arrangements for handling mechanical energy structurally associated with dynamo-electric machines, e.g. structural association with mechanical…:…