Fliesler, Dubb, Meyer & Lovejoy, LLP
Economical wide range speed control system
 A speed control system is disclosed wherein a brushless DC motor and a magneto resistive encoder are able to rotate a motor at arbitrarily low speeds. The motor is able to rotate at low speeds by having a filtered signal generated by an encoder applied to its inputs. The encoder is coupled to a series of filters which remove DC level and harmonic distortions from the resulting encoder signal. These filtered signals are then applied to the motor to control motor rotation speed. 
Seagate Technology, Inc.
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inventional inventional inventional inventional
Martyn A.
Lewis