Electricity: motive power systems – Battery-fed motor systems
Patent
1997-04-23
1999-06-08
Ip, Paul
Electricity: motive power systems
Battery-fed motor systems
318599, 318430, 180206, 180207, 477 15, B62M 2302, H02P 516
Patent
active
059107146
ABSTRACT:
This disclosure describes an improved electrical power apparatus for assisting a rider in powering a wheeled vehicle such as a bicycle. The apparatus controllably connects a rechargeable battery to a dc motor engageable with a wheel of the vehicle in a predetermined fashion, such that the wheel is driven with a torque that varies with the vehicle's speed according to a predetermined non-uniform profile. This control advantageously can be achieved by modulating on and off a switch at a duty cycle between 0% and 100%, which is selected to provide a motor torque that decreases monotonically with the vehicle's speed, from a maximum value at zero speed to a predetermined intermediate value at a predetermined intermediate speed, and that remains at that predetermined intermediate value for speeds between the intermediate speed and a predetermined maximum speed. The apparatus further includes a charger for charging the battery using a flyback-type dc-to-dc converter.
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Buchanan W. Darrell
MacCready Paul
AeroVironment Inc.
Brueggemann James R.
Ip Paul
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