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When the motor speed is reduced by using a regenerative brake, the mechanical energy of rotation can be converted to the regenerative electric energy. In order to improve the efficiency of the motor drive systems, optimal regenerative and acceleration torques of the motor should be discussed in order to maximize the regenerative electric energy and to minimize the required energy for acceleration...
This paper proposes a black box approach which synthesizes lumped circuit model of the Foster type for a frequency-dependent characteristic element by the least squares method systematically. However there are two numerical difficulties to model them. One is the numerical stability problem which comes from limitation of effective numerical digits of data especially for wide frequency band ranges....
Quick detection of a small initial fault is important for an AC motor drive system to prevent a consequent large fault. Papers for the detection have been proposed, for example, by the park vector (PV), the AI techniques, the wavelet analysis, and the negative sequence analysis approaches. This paper proposes a diagnostic method of a stator winding fault of an induction motor by combination of the...
When the motor speed is reduced by using a regenerative brake, the mechanical energy of rotation can be converted to the regenerative electric energy. In order to improve the efficiency of the motor drive systems, optimal regenerative and acceleration torque of the motor should be discussed in order to maximize the regenerative electric energy and to minimize the required energy for acceleration....
When the motor speed is reduced by using a regenerative brake, the mechanical energy of rotation can be converted to the regenerative electric energy. In order to improve the efficiency of the motor drive systems, the regenerative power is charged and discharged by power storage systems (PSS). Moreover, optimal regenerative and acceleration torque of the motor should be discussed in order to maximize...
This paper proposes a design methodology of a regenerating braking torque for an induction motor in order to regenerate power as much as possible. At first, models of dissipation power in rotation and the copper losses in both a stator and a rotor are given. Then, a function of a regenerative power is derived from these losses, regenerating torque for the function of the regenerative power. A vector...
It is objective and practical for an electric machinery and apparatus test to computerize its diagnosis process with fault location identification. It is possible to recognize a fault location from measured voltage and current information by using a Kohonen's self-organizing map (SOM) which only needs a learning process of relation between the locations and their voltage and current characteristics...
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