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Braking of induction motor has been the subject of many researches in order to improve its performances. Many braking induction motor's strategies have been developed. Conventional braking modes are electromechanical such as braking with servo motor and counter current braking; then electrical one as direct current braking (DC). These two techniques have major drawbacks which limit their use. The...
A new energy-saving scheme of voltage-regulation control for induction motors at periodically varying loads with almost constant speed is presented in this paper. The energy-saving principle, control strategies, triggering mode of SCRs are studied. Based on the analysis of the current oscillation in the voltage-regulation by 3-phase thyristors with the synchronous voltage signal, the solution to current...
This paper proposed a DFC (discrete frequency control) method based on equivalent sinusoidal modulation for thyristorized soft starters, including the basic control method and a simplified method to search for the optimal initial phase angle combinations of three-phase DFC system. The compensation mode of freewheeling angle of a thyristor and the transition method from one discrete frequency to another...
This paper presents a simple technique based on stator flux estimation to control the electromagnetic torque of induction motors during soft starting. The inherent problems related to pure integration of the back electromagnetic force to estimate the stator flux are minimized using the low pass filter approach. The experimental results are dealt with and compared to the usual current control technique.
This paper proposes a Constant-current soft starting based on fuzzy control strategy. In this method, the fuzzy control rules are adjusted based on the changes of the starting current in time, which effectively eliminates current and torque oscillation compared with the traditional PID control soft starting. Checking full-voltage method is proposed based on simulation results of the relationship between...
A novel proposal is made in this paper towards minimization of starting torque pulsations of ac voltage controller fed induction motor drive. An optimization model of the problem is presented and optimum SCR firing angle is identified through genetic algorithm (GA). Computed results on two different induction motors show the effectiveness of the proposed algorithm.
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