Electrical generator or motor structure – Dynamoelectric – Rotary
Reexamination Certificate
2000-10-04
2001-11-27
Nguyen, Tran (Department: 2834)
Electrical generator or motor structure
Dynamoelectric
Rotary
C310S254100, C310S156380, C310S216006
Reexamination Certificate
active
06323576
ABSTRACT:
TECHNICAL FIELD OF THE INVENTION
The present invention relates to electric power generating devices, and more particularly to an electric power generator having high efficiency which is light in weight, operates from a non-continuous or a continuous force, and may exhibit a negative input force requirement for brief periods during operation.
BACKGROUND OF THE INVENTION
A common method of powering hand-held flashlights or portable electrical devices is through the use of replaceable primary batteries, such as, for example, carbon-zinc, which are limited to a single discharge and typically have a limited shelf life. Some devices are provided with batteries of the type adapted to be recharged, such as nickel-cadmium batteries. Some electrical devices incorporate recharging units for the batteries, so that the unit may be plugged into a conventional wall outlet or other power source for recharging of the batteries. In other devices, auxiliary recharging devices are provided as separate units to enable recharging of the batteries in the device from various sources of power. While such arrangements have definite usefulness, it is apparent that their operating time in field use is limited to a single charge on the batteries and by self-discharge characteristics, and therefore these devices cannot be used for extended periods of time if separated from normal sources of power. In addition, unless constant care is taken on the part of the operator to maintain the charge on the batteries, such units may not be available at times of need or emergency.
Other portable electrical devices have incorporated various forms of manually operated generators to enable the operator to use the device without prior charging, such devices have the advantage that they are continuously available for use whether in emergency situations or in the event extended operation remote from conventional power sources is necessary. However, such devices have disadvantages, such as, for example, the constant operation becomes fatiguing, and the device ceases to function if the generator operation is stopped more than momentarily. Further, the hands of the generator operator may not be available for other manipulations. Many such devices have employed a variety of methodologies, such as, for example, fly wheels, to extend the operation of the generator to allow free use of hands or untended operation, and to level the output of the generator to avoid detrimental effects on the load.
A need has thus arisen for an electric power generator that will provide high current output at low input shaft forces to make even manual operation easy and practical.
SUMMARY OF THE INVENTION
In accordance with the present invention, an electric power generator is provided. The generator includes a stator including a plurality of stator members, each stator member including a coil and top and bottom elements separated by a gap. The top and bottom elements each include a face. The generator further includes a rotor having a plurality of magnets. The rotary is rotatably mounted, such that the plurality of magnets pass within the gaps in the stator members when the rotor is rotated with respect to the stator. The magnets have a shape substantially equal to the shape of the stator member faces. The shape is chosen to produce a non-linear rate of field change when the magnets and stator faces interact. Each of the magnets overlap the stator faces as the rotor rotates, such that the area of overlap and non-overlap of each of the magnets changes non-linearly.
The use of magnets and stator faces having a non-linearity in the change of the interacting area results in a greater induction, a higher EMF is induced, for the same relative velocity between the magnet and stator than there would be if one used square or rectangular magnets of the same total flux and stator faces which were of the same size and shape.
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Locke Liddell & Sapp LLP
Nguyen Tran
Power Works, Inc.
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