Patent ID: 8692426

Claim:
A direct current motor comprising: a magnet assembly having a plurality of magnets for generating a magnetic field; a coil assembly located between the plurality of magnets, the coil assembly and the magnet assembly being movable relative to each other, the coil assembly further comprising a first coil section and a second coil section electrically connected in series to each other, a center tap wire being connected between the first and second coil sections; and a current generator electrically connected to the coil assembly which is operative to provide first, second and third currents, the first current being electrically connected directly to the first coil section, the second current being electrically connected directly to the second coil section and the third current being electrically connected to the first and second coil sections at a position connecting to the first and second coil sections through the center tap wire, wherein the third current generates ohmic heat but at the same time does not provide motor force to the direct current motor.