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A new rotor position sensorless method for switched reluctance motor drive system (SRD) is described in this paper. Rotor position can be considered as a function of phase current and the variation rate of it. Using the phase current obtained by sensors and the current variation the rotor position can be estimated accurately and quickly. A control strategy of SRD without position sensor is researched...
This study presents bi input-extended Kalman filter (BI-EKF) based speed-sensorless direct torque control (DTC) of induction motors (IMs). For this aim, all states required for the speed-sensorless control system as well as commonly known parameter uncertainties related to stator resistance Rs, rotor resistance R'r, and load torque tL including also viscous friction term have been estimated by using...
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...
Indirect Stator-Quantities Control (ISC) combines the principle of stator-flux-orientation proven successful in Direct Self Control (DSC) with Pulse-Width Modulation (PWM). High torque dynamics and robust behaviour against input voltage disturbance are achieved in the whole operation range including field-weakening. After careful correction of inverter-voltage errors and dc portions in the stator...
The performance of a speed sensorless variable structure direct-torque-controlled interior permanent magnet synchronous motor drive at very low speeds including standstill is investigated in this paper. The rotor position and speed are estimated using a high-frequency (HF) signal injection algorithm at low speeds and a sliding observer at medium to high speeds. The changeover between these two algorithms...
A sensorless direct torque controlled (DTC) induction motor drive fed by a 3-level inverter is presented based on discrete space vector modulation. A novel vector synthesis sequence is proposed to solve the problems caused by the topology of the 3-level inverter, such as neutral point unbalance and excessive voltage jump, while maintaining the merits of simplicity and robustness. Fuzzy logic control...
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