Nice, variable speed electric motor gives

Some fees variable speed electric motor plans: src=http://i.ytimg.com/vi/kwWPH9vgsXw/default.jpg This is a 1 / motor 2 hp variable speed from an insertion mail. This shows that there are many components and how it performs. The outer casing of the motor often runs at full speed when the device is turned on. Additionally DC -50 volts is applied to the magnetic coupler. This magnetically couples the inner shaft of the rotating outer shell. This changes the torque from the inner shaft.

Tesla's Energy Motor