Abstract
The measurement at low speed becomes very difficult due to the slow response of transducers. At low speed (below 10 r/min), normally, transducers take several seconds to give the required output signal. In the proposed technique, a fast rotating magnetic field (RMF) is used to measure the speed as well as deviation in speed for low-speed machines. A sine wave oscillator (single-phase ac source) is used to generate a balanced three-phase ac voltage, which is applied to the stator windings of a synchro whose rotor is coupled with the rotating member or rotor of a motor. The RMF in the air gap generates emf in the rotor of the synchro whose frequency depends upon the slip speed. Since the RMF revolves at a speed several times the speed of the rotating member or the rotor of the motor, hence the measurement becomes very fast. The proposed scheme is tested successfully even at 1 r/min, and the overall performance is recorded at dynamic conditions. The results of the measurements are compared with a conventional method (tachogenerator), which shows the accuracy of the proposed method. The output is also obtained in terms of dc voltage and dc current, which can be used for feed-back and control applications.
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