MOTOR CONTROL DEVICE

A method and system to convert a constant speed motor drive (40) into a variable speed motor drive (80) are disclosed. The method comprises disconnecting a second terminal (68) from a first terminal (54) by removing from the constant speed motor drive (40) a first cover assembly (46) comprising the second terminal (68), the constant speed motor drive (40) comprising the first cover assembly (46) and a base assembly (42) including the first terminal (54), the cover assembly further comprising a constant speed controller (66), the first terminal (54) adapted to receive an alternating-current (AC) voltage and including motor contacts operable to output a motor voltage, wherein the constant speed controller (66) generates the motor voltage for the motor contacts when the constant speed controller (66) operates; and connecting a third terminal (68) to the first terminal (54) by coupling a second cover assembly (82) to the base assembly (42), the second cover assembly (82) comprising the third terminal (68) and a variable speed controller (100) electrically coupled to the third terminal (68).