Johnson Controls Technology Company

Johnson Service Company

David R Fuhr

Gary A Romanowich

Russell W Diamond

Kevin A Weiss

Dennis J Ulicny

Hugh F Hudson

David C Ritmanich

Peter J Klomberg

A method for operating a direct current (DC) motor is shown and described. The method includes generating a first pulse width modulated (PWM) signal having a first duty cycle, providing the first PWM signal as a PWM DC output for the DC motor, and adjusting the first duty cycle to control a speed of the DC motor. The method further includes sensing an electric current output to the motor using a current sensor and, when the sensed current exceeds a threshold, holding the PWM DC output off.

Systems and method for speed and torque control of a DC motor

A method for operating a direct current (DC) motor is shown and described. The method includes using pulse width modulated (PWM) DC output to control the speed of the DC motor. The method further includes sensing current output to the motor. When the sensed current exceeds a threshold, the method holds the PWM DC output off.

An apparatus for effecting actuation of a positioning member and a method for commissioning the apparatus wherein the apparatus includes a controller coupled to a drive motor and adapted to receive an input signal and to apply positioning signals to the drive motor. The positioning signals selectively effect positioning of the positioning member and determine a first position and a second position of the positioning member. The method for commissioning the apparatus selectively includes performing an end stop determination sequence in response to an end stop determination signal, winding a bias member, and determining a range of rotation for the positioning member. The end stop determination sequence seeks to detect the presence of both a load and spring when rotating the positioning member and biasing member, respectively, in one of a first and second direction. The load and spring are detected, if present, by monitoring the rotation of the positioning member and bias member, respectively, to detect a stall before the positioning member and biasing member, respectively, exceed a predetermined position. Similarly, during the wind spring sequence and range sequence, the rotation of the biasing member and positioning member, respectively, are monitored for a stall that indicates that the biasing member is cocked and the end stop of the positioning member is determined, respectively.

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Menomonee Falls, WI, United States of America

David R Fuhr