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This paper presents a new simplified V/f control system of induction motor (IM) for precise speed operation, which is based on the vector control theory. A linear model is derived for analyzing the system stability, including the influences of motor operating states in motoring and regenerating operations, and parameter variation of low pass filter. A stator resistance identification is proposed by...
This paper investigates consequences of the differences between the actual, practical operating conditions of in-service induction motors and the ideal operating conditions that apply for the Standard Type Test, following the IEEE 112-B method. In these tests, the significance of each factor influencing motor efficiency, including operating temperatures, temperature rise, voltage supply magnitude,...
This paper presents a novel low-intrusion load and efficiency evaluation method for in-service induction motors based on vibration measurements. This method enhances the traditional vibration analysis by providing motor load and efficiency information in addition to the mechanical health information. The application is in multimotor plants, where individual motor monitoring is too expensive to implement...
This paper presents a novel V/f controlled induction motor for improvement of speed characteristics. The proposed method is an auto-boost voltage method to compensate the voltage drop of stator impedance and a slip frequency compensation method to decrease the speed error caused by the change of load. The operating region of proposed method is discussed by using vector locus. The stability of the...
This paper presents a novel none-intrusive load and efficiency evaluation method for in-service induction motors based on vibration measurement. The application is in multi-motor plants where individual motor monitoring is too expensive yet where motor operational conditions are not accurately determined. The vibration from the motor is detected by an accelerometer and processed by fast Fourier transform...
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