US 5,880,544 AGranted

Flywheel-type power storage device

AssigneeNippon Oil Co., Ltd.

InventorsTetsufumi Ikeda, Takahiko Itoh

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Abstract

A flywheel-type power storage device comprises a coreless synchronous and outer rotor-type motor and a flywheel. The motor comprises a stator provided with a stator winding having a cylindrical portion, and a rotor having inner and outer field members constituting therebetween a field gap in which the cylindrical portion is positioned. At least one of the inner and outer field members comprises a permanent magnet. A bearing is provided between the stator and the rotor so as to rotatably support the rotor against said stator. The stator is separated into a bearing portion constituting the bearing and a stator body provided with the stator winding. The bearing portion is supported via an elastic member by the stator body. The flywheel is fixed on the outer side of the outer field member.

Claims23

Dependent claims

A flywheel-type power storage device including a coreless-type rotary electrical machine comprising:

a stator including a stator frame;
a stator winding fixed to said stator frame;
said stator winding including a plurality of sets of three-phase windings, and having a cylindrical portion;
said sets of three phase windings being isolated from each other;
a rotor having inner and outer field members constituting therebetween a field gap in which said cylindrical portion is positioned, wire portions located in said cylindrical portion and each of said wire portions wound in parallel to an axis of said rotor, wherein at least one of said inner and outer field members is a permanent magnet;
a bearing means provided between said stator and said rotor so as to rotatably support said rotor against said stator, and including a bearing housing supported via an elastic member by said stator frame;
a flywheel positioned outside said outer field member and made of a fiber-reinforced plastic material having reinforcing fibers;
and
said reinforcing fibers are disposed circumferentially about said flywheel such that an elastic moduli/density increases in a radial direction from an inner portion of said flywheel to an outer portion of said flywheel.

6 more elements

Dependencies are inferred from the claim text.

Facts

Application: 08/847,680Filed 28 Apr 1997 · continuation in part
Priority: JP 6-4061516 Feb 1994
Granted: 9 Mar 1999
Term ends: Not estimatedThe source records don’t support an estimate.

Classification10 codes

F16F 15/315
Flywheels: characterised by their supporting arrangement, e.g. mountings, cages, securing inertia member to shaft
H02K 7/025
Additional mass for increasing inertia, e.g. flywheels: for power storage
H02K 21/22
With stationary armatures and rotating magnets: with magnets rotating around the armatures, e.g. flywheel magnetos
H02K 29/06
Motors or generators having non-mechanical commutating devices, e.g. discharge tubes or semiconductor devices: with position sensing devices