By M. Ahmad
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RS (1) VS VS VS (2) Study on the Energy Efficiency of Soft Starting of an Induction Motor with Torque Control I S IS . RS dt. (6) From the previous equations, the flux magnitude and angle of the estimated stator flux can be written as: S 2 S 2S (7) S . tan 1 S (8) Finally, the electromagnetic torque of the motor can be estimated using the following cross product: 3 P Tem . S IS 2 2 (9) where P is the number of poles of the induction motor.
5 shows the diagram of the current control technique. The three current signals are used to calculate the true RMS current value. This current value (IRMS) is used by the controller as the feedback signal in order to keep the current constant at the pre-set value (IREF) during the motor starting process. This technique will always generate an almost constant starting torque curve that can be applied to a constant load torque. This technique has the advantage of adapting the induction motor starting within the capabilities of the supplying utility.
As can be seen in Fig. , the acceleration is almost constant except at the final period of the starting process when the acceleration increases, at least, by two times. This behavior is not desired, and it may damage the mechanical system components. , the same as that of the supply voltage. The current can thus be kept constant at a predefined value during the whole motor starting time. However, with regard to the torque at the motor shaft, the existence of a torque pulse close to nominal rotation is due to the SCRs’ trigger angle which becomes minimum, imposing a feeding voltage and sudden motor acceleration.