Franklin Electric Company, Inc.

Robert L Wetekamp

Wei Song

Adrian Russell Chavis

Douglas C Lynn

Steven W Aikman

Terry A Smith

Andrew C Grubbs

A motor drive and method to control a motor in a fluid system. The method may comprise determining a pressure; determining a proportional error as a limited difference between the pressure and a pressure setpoint; determining an integral step as a limited proportional error; determining an integral error as a limited sum of the integral step and a preceding unbound integral error; determining an error as the product of the integral error, the proportional error, and a gain factor; and generating a control signal to cause the inverter to output a motor voltage to drive the motor and maintain the pressure about the pressure setpoint.

Motor drive system and method

A method and system to convert a constant speed motor drive () into a variable speed motor drive () are disclosed. The method comprises 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 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 ().

Motor control device

A pump and a method of operating the pump at a duty-cycle based on the input voltage of the power source energizing the pump. The pump includes at least a first opto-coupler electrically coupled to the power source. The method includes detecting at least a first opto-coupler state transition; determining a zero-crossing of the input voltage; determining an elapsed time between the zero-crossing and the first opto-coupler state transition; and operating the pump by energizing a power switch at a duty-cycle based on the elapsed time.

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Fort Wayne, IN, United States of America

Robert L Wetekamp