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An inductance-based control strategy, for further optimize parameter design which is conducted through inductance adaptive variation on LLC resonant converter, is proposed. A simple switch concept is applied to set the desired magnetizing inductance, the main control factor, to achieve light load efficiency improving and overall required switching frequency range narrowing. Evaluation for showing...
Based on image processing technique, this paper used face images of users as virtual images to automatically produce different facial expression images. The face images in neural state can be transformed into the facial expression images. First, for the face images in neutral state, skin color segmentation and morphological noise processing were conducted to separate the possible face zone from the...
This paper studies a direct torque controlled interior permanent magnet synchronous motor (IPMSM) drive based on a novel flux model of the motor. First, a full digital PMSM drive is implemented based on a TMS320-F2808 DSP. Next, the paper studies the direct torque controlled method. By using the novel flux model, the controlled voltages can be decided correctly to eliminate the flux and torque errors...
This paper proposes two different methods to estimate the shaft position for a switched reluctance motor. Method 1 uses the self-inductance estimation technique to obtain the rotor position. First, by on-line measuring the slope of the stator current and compensating the back EMF effect, the self-inductance of the switched reluctance motor can be detected. Then, the shaft position of the motor can...
This paper proposes an adaptive backstepping controller design for a position control system of permanent-magnet synchronous motors. The proposed system has been successfully used in a knitting machine with satisfactory performance, including fast transient responses, good steady-state responses, and good tracking ability. Based on properly selecting a Lyapunov function, an adaptive backstepping position...
This paper proposes a nonlinear speed-loop controller for sensorless control of a switched reluctance motor (SRM). By on-line estimating the self-inductances of the motor, the shaft position and speed of the SRM is obtained. A simple nonlinear controller can compensate for speed-estimation error and parameter variations is derived from a Lyapunov function. Then, a closed-loop sensorless drive system...
In this paper, a novel converter for a switched reluctance motor (SRM) drive system is proposed. A small capacitance is used to store the energy extracted from an offgoing phase and raise the dc bus voltage during phase commutation. The raised bus voltage can turn on the next ongoing phase and turn off the offgoing phase quickly. As a result, the commutation interval of the motor is effectively reduced...
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