Development of PC based closed loop control system for stepper motor to control the exit area of an isolated intake model

Anju, Sharma and DB, Singh and Panneer , Selvan M (2010) Development of PC based closed loop control system for stepper motor to control the exit area of an isolated intake model. Project Report. NAL, NAL.

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Abstract

A closed loop PC based system has been developed to drive a stepper motor to control the exit area of an isolated Air intake model. The exit area of the intake model is rectangular, which can be varied by turning a rectangular butterfly valve. The valve is connected to a shaft which is driven by a 6V DC stepper motor. The motor operates at 200 pulses per revolution which corresponds to 1.8/pulse. During the run, the butterfly valve is operated from fully open to nearly closed state, a reduction gearbox (reduction ratio = 1:15) further reduces the speed of rotation to 0.12 per pulse. The PC based software for the stepper motor control provides the chosen number of pulses with a resolution of 1 pulse, equivalent to 0.12. The motor shaft is also connected to a pair of anti-backlash gears, used to drive a 10-turn potentiometer. The output of the potentiometer is calibrated and used to determine the valve position during the run. The software developed can run the motor at any number of chosen steps. After the required steps are achieved, the valve can be driven in reverse direction through any number of chosen steps, which could be the same as forward path or different. The hardware and software are established in such a manner that the whole system could be stopped automatically once the requirement for a particular experiment is over. The complete details of the control set-up i.e. hardware as well as software are included in this report. The whole set-up developed in this work was effectively useful for conducting wind tunnel tests on an isolated supersonic intake in the NAL 0.3m Wind tunnel as reported in the Project Document No. TM0110.

Item Type:	Monograph (Project Report)
Subjects:	ENGINEERING > Electronics and Electrical Engineering
Depositing User:	Anju Sharma
Date Deposited:	06 Aug 2010 06:05
Last Modified:	01 Sep 2010 10:37
URI:	http://nal-ir.nal.res.in/id/eprint/8898

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