Induction motor is a high efficiency electrical machine when working closed to its rated torque and speed. However, at light loads, there is no balance between copper and iron losses, which results in considerable reduction of efficiency for induction motor drive. The part load efficiency and power factor can be improved by making the motor excitation adjustment in accordance with load and speed. In this paper, an efficiency optimization controller of induction motor drive system, based on searching the value of stator voltage that maximizes the efficiency, will be developed. Then, the validity of the proposed controller and the performance of the drive system have been analyzed by simulation results. To reduce the slip at light loads and low frequencies, a slip compensator has been introduced.
An experiment was conducted to study the effect of pinching methods on carnation under protected condition. The results of present investigation revealed that the variety Liberty (V 2) recorded significantly the highest number of flowers per plant (6.23), number of flowers per square meter (205.70) and flower yield per hectare (2077778 Numbers). As per quality point of view the variety Farida (V 3) recorded significantly the highest vase life (12.33 days) and longevity of flowers (16.98 days). The treatment P 3 (Double pinch) resulted in significantly the highest number of flowers per plant (6.75), number of flowers per square meter (222.75) and flower yield per hectare (2250000 Numbers). The treatment P 1 (Single pinch) recorded significantly the highest vase life (11.94 days) and longevity of flowers (15.61 days).
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