Motor with adjustable back-electromotive force

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United States of America Patent

PATENT NO 11183912
APP PUB NO 20190296624A1
SERIAL NO

16440362

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ATTORNEY / AGENT: (SPONSORED)

Importance

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Abstract

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The described apparatus and method enable alteration of motor properties during operation of a motor. For example, the rotor of the motor may be adjustable, during motor operation, between a first diameter and a larger, second diameter. When the diameter of the rotor increases, the distance between the electromagnetic coils of the stator and the magnets of the rotor increases, thereby reducing the back-electromotor force (back-EMF) of the motor. When the back-EMF of the motor decreases, the torque of the motor decreases but the maximum revolutions per minute (RPM) increases. When the diameter of the rotor decreases, the distance between the electromagnetic coils of the stator and the magnets of the rotor decreases, thereby increasing the back-EMF of the motor. When the back-EMF of the motor increases, the torque of the motor increases but the maximum RPM decreases.

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Patent Owner(s)

Patent OwnerAddress
AMAZON TECHNOLOGIES INCPO BOX 81226 SEATTLE WA 98108-1226

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Beckman, Brian C Newcastle, US 188 5349
Brown, Austin Boston, US 19 288

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