Motor control device

A method to convert a constant speed motor drive into a variable speed motor drive, the method comprising:

• disconnecting a second terminal from a first terminal by removing from the constant speed motor drive, a first cover assembly comprising the second terminal, the constant speed motor drive comprising the first cover assembly and a base assembly including the first terminal, the first cover assembly further comprising a constant speed controller, the first terminal adapted to receive an alternating-current (AC) voltage and including motor contacts operable to output a motor voltage, wherein the constant speed controller generates the motor voltage for the motor contacts when the constant speed controller operates;
• and
• connecting a third terminal to the first terminal by coupling a second cover assembly to the base assembly, the second cover assembly comprising the third terminal and a variable speed controller electrically coupled to the third terminal, wherein the variable speed controller generates the motor voltage for the motor contacts when the variable speed controller operates, whereby removing the first cover assembly and coupling the second cover assembly from/to the base assembly converts the constant speed motor drive into the variable speed motor drive.