The paper considers controlling DC motor speed using LabVIEW-based frequency locked loop control algorithm which consists of a set of virtual instruments. Power interface circuit is required to supply the motor. In order to realize frequency-lock; a software digital integrator is used by implementing up-down counter. Proportional control term is included in order to control the depth of integral action. The result of the experiment shows acceptable startstop time characteristics and that motor speed is hold constant independent of motor load changes.
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