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An intelligent liquid-state soft starter is made by connecting in series a special resistance to motor stator circuit. Using embedded control technology and an intelligent control algorithm, the speed, the rise and fall of the movable polar plate can be changed, and the resistance can be changed accordingly. With liquid-state resistance reducing gradually from maximum to zero, motor can be accelerated...
A non-intrusive stator winding resistance estimation technique is proposed for soft-starter-connected induction motors. By changing the gate drive signal of the thyristors in the soft-starter, a small dc bias can be intermittently injected to the motor. Based on continuous monitoring of the stator winding resistance, a new thermal monitoring scheme is proposed using only voltage, current, some motor...
A remote and sensorless stator winding resistance estimation method for thermal monitoring has been proposed for soft-starter-connected induction motors by the authors. As an continuation of the previous work, this paper specifically focuses on the practical implementation of the proposed method. In this paper, a compensation method for the measurement offsets is introduced to improve the performance...
In this paper, a method of sensor less best exciting in towards polarity by stator-electricity of synchronous motor is presented on the base of calculated best exciting time through simulation in order to solve the present problems and enhance the reliability of excitation exist in asynchronous starting of synchronous electrical machine. Detect and analyze the wave of stator current to catch the best...
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