The money raised by the sale of the wheelchair will go to the Stephen Hawking Foundation and the Motor Neurone Disease Association.
According to the Associated Press, Hawking's 1965 Cambridge University thesis, "Properties of Expanding Universes", sold for 584,750 pounds (nearly $767,000 in U.S currency), over three times the pre-sale estimate.
Hawking researched the origins of the universe, black holes and other phenomena while fighting motor neuron disease, which gradually weakens of all the muscles in his body.
The electronic voice synthesizer is one of the most famous factors that makes the name Stephen Hawking for ages.
Late last month, I wrote about an auction for a whole bunch of very cool items once owned by Stephen Hawking.
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A copy of his bestselling A Brief History of Time, signed with a thumbprint, sold for £68,750, a bomber jacket went for £40,000 and the script for one of his appearances on the USA television show The Simpsons sold for £6,250.
The sale, run online by Christie's and including 52 lots, raised more than £1.8m on Thursday.
Medals and awards sold for £296,750, compared with an estimate of £15,000, while the red motorized wheelchair sold for £296,750, also compared with an estimate of £15,000. His medals and awards sold for £296,750.
"We are also giving admirers of his work the chance to acquire a memento of our father's extraordinary life in the shape of a small selection of evocative and fascinating items".
His research shaped modern cosmology and helped ordinary people better understand the universe, and his book, A Brief History Of Time, sold 10 million copies and was translated into 40 different languages. Hawking's family is donating other items from Hawking's archive to the British government in lieu of paying inheritance tax.