Electricity driven device and method for increasing the...

A - Human Necessities – 01 – D

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A01D 34/58 (2006.01) A01D 69/02 (2006.01)

Patent

CA 2150531

An electricity driven device and method for increasing the rotational inertia of a rotary object or the blade of a lawn mower includes securing an annular fixed element on a non-rotating main shaft. A rotary element has one part extending to a front end of the main shaft to form a coupler which is coupled to the rotary object or the blade, while the other part thereof extending around the periphery of the fixed element to increase the rotational inertia of the rotary object. A plurality of permanent magnets or coils are arranged around the periphery of the fixed element. Correspondingly, a plurality of coils or permanent magnets are arranged at the inner rim of the rotary element. When electric currents are supplied to the coils, an electromagnetic field is generated between the coils and the permanent magnets to drive the rotary element to bring the coupler and the rotary object to rotate therewith.

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