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The Universal Field Oriented Controller Applied to Tapped Stator Windings Induction Motors
No full textThe Universal Field Oriented (UFO) Controller applied to a Wide Speed Range Induction Motor Drives
No full textSelf Tuning of Induction Motor Servo Drives using the Universal Field Oriented Controller
No full textThe universal field-oriented (UFO) controller is used to control the induction motor torque and airgap flux independently of each other. In this work, the direct UFO control is realized by sensing the airgap flux using center taps on two machine windings. Moreover, an adaptive control scheme that accomplishes a continuous and automatic tuning of the rotor time constant of the field-oriented controller whenever the drive operates in the direct field orientation mode is proposed. In addition, at low invertor frequencies, the UFO controller switches over to the indirect field orientation mode in which the rotor time constant is frozen to the last tuned value of the previous direct field orientation mode. At steady state and elevated speeds the induction motor servo drive has no detuning errors when operating under direct field orientation, while at low speeds the indirect field orientation mode exhibits minimal errors. The latter expands the use of the high-performance induction motor drive up to standstill. The proposed field-oriented controller can be realized at minimal cost in AC servomotor drives requiring motion control or accurate speed contro
Self Tuning of Induction Motor Servo Drives using the Universal Field Oriented Controller
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Low Stray Inductance Bus Bar Design and Construction for Good EMC Performance in Power Electronic Circuits
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Universal Field Oriented Controller Based on Air Gap Flux Sensing via Third Harmonic Stator Voltage
No full textA universal field oriented (UFO) controller operating in the air gap flux reference frame is applied to a current regulated pulse width modulated (PWM) induction motor drive. The air gap flux is measured by the stator third harmonic (TH) voltage component. It is shown that, due to motor saturation, a TH flux component is generated in the air gap. Since the TH flux component is a function of the fundamental air gap flux and is always in phase with it for any load condition, it constitutes an accurate way of measuring the fundamental air gap flux. This harmonic flux component induces a TH in each one of the motor phase voltages, and it is shown how this voltage is processed for the measurement of the air gap flux and consequent implementation of the UFO controller. Due to the robustness of the TH sensing method and to the structure of the UFO controller, the resulting drive is not affected by detuning errors in steady-state operation. In addition, the UFO drive has excellent dynamic performance, even under strongly detuned condition
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