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In variable speed applications based on induction motor (IM) drives, two types of popular control strategies are distinguished: rotor flux oriented control (RFOC) and direct torque control (DTC). This paper investigates an experimental evaluation of four control strategies for two-level three-phase inverter fed IM drives, namely: (i) RFOC with current-controlled PWM, (ii) RFOC with voltage-controlled...
The uses of induction motor is ever-growing day by day because of its superiority and high efficiency over dc machine. So for wide range of use in the industry, this machine requires an efficient driver circuitry arrangement. Currently conventional Voltage Source Inverter (VSI) or Current Source Inverter (CSI) is dealing as key part in the field of induction motor driver circuit. These converters...
This paper presents an analysis of the magnetic saliencies in induction machines based on the injection of a zero sequence carrier. This way of injection allows evaluating those components of the admittance matrix which are not usually considered in the literature. The injection of the zero sequence carrier can easily be implemented, does not perturb the current control and the evaluation of its response...
Sustained oscillations are often experienced when induction motor (IM) is fed with general-purpose PWM inverter operated in constant V/f mode, especially under light loaded and low frequency conditions. To stabilize the annoying oscillations and facilitate engineering practices of the simple control mode, an enhanced V/f control strategy is proposed following the analysis of the inherent mechanism...
This paper describes an automatic identification procedure for an induction motor. The transfer function of the motor at standstill is used to obtain a linear parametric model. An on-line parameter estimator is then derived from this model. In the implementation of the proposed estimator, a PI current controller is constructed to stabilize the current signal and to prevent the flux from saturation...
A recently developed control method for multiphase induction machine drives termed the Brush-DC Equivalent control has presented a simpler control strategy that does not use any complex transformations. It has been implemented using a hysteresis current controller and in this paper, a delta modulated current control technique is presented. Delta modulation is proposed in to replace hysteresis control...
This paper deals with sensorless constant v/f closed loop control of high-power induction motor with synchronized space vector pulse width modulation (SVPWM). The rotor speed is estimated based on the difference between the rotor flux speed expressed in stationary reference frame and slip speed. The estimated stator flux and the synchronous speed are used to generate the estimated back EMF. The difference...
This paper presents the application of carrier phase-shifted PWM technology in the position detection for permanent magnet synchronous motor at standstill position. At the same time, it gives the polarity identification in the rotary frame with detected position from the neutral voltage. The new technique describes the method of carrier phase-shifted PWM technology with neutral voltage. It can detect...
This paper gives a review of sensorless methods developed for AC drives' operation at very low and zero speed. The sensorless drives presented in this paper use reluctance spatial anisotropy to track the mechanical rotor position, allowing the use of vector control. To extract the position information additional test signals in form of active vector pulses or continuous high frequency signals are...
This paper describes a sensorless Interior Permanent Magnet Synchronous Motor (IPMSM) drive designed for traction applications. Wide-speed sensorless operation is provided with the use of three methods of rotor position estimation designed for: a standstill, low- and high-speed range. The paper focuses on the high-speed estimation algorithm. The estimator uses the derivatives of motor phase currents...
Contemporary field oriented controlled induction machine drives constitute a good compromise between high power density and economical employment of exhaustible raw materials. Since for such drives the excitation is created by the magnetizing current which is part of the stator current along with the torque generating fraction, there are two degrees of freedom in the stator current generation to achieve...
The main idea of this paper is a steady of power exchange in a Doubly Fed Induction Machine (DFIM), operating in motor mode, and supplied with two PWM inverters in both sides. An active power distribution law between the stator and rotor is developed and the adequate rotor and stator inverters ratings are studied. This active power distribution law imposes a connection between rotor and stator frequencies...
The objective of this paper is to investigate an accurate on-line parameters identification method for PMSM. Because a majority of controllers are based on motor models, the parameters of stator resistance and dq-axis inductances play important roles for achieving high-performance control. However, voltage drop between the reference and output voltage in a pulse width-modulation (PWM) voltage source...
This paper investigates the minimum requirements to implement compensation schemes for saliency based sensorless control schemes that will work successfully irrespective of the method or machine type. The paper focuses on analyzing the saliency disturbance components due to the machine only, by simulating a machine with a FEM model, and coupling this to a simulation of a full sensorless control which...
Resolution of Initial position estimation based on high frequency voltage signal injection for IPMSM was investigated. The simulation was carried out to investigate the influence of inductance saturation due to motor drive currents and quantization errors due to A/D conversion on the estimation accuracy. An experimental system consisting of a IPM motor and a voltage-source PWM inverter has been implemented...
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 effect of inverter supply on the eddy-current losses in the laminated core of a synchronous machine is studied. A 2D finite element model including a dynamic model for the eddy currents in the core laminations is applied to predict the machine losses by numerical simulations. A synchronous extruder motor is simulated both with sinusoidal and pulse-width modulated voltage supplies in different...
Multi-cell inverter include an array of singlephase inverters capable of handling higher voltage ratings with lower rating power electronics devices. In this paper, a Real Time Digital Feedback Controller (RTDFBC) combined with a Repetitive Controller is proposed to control a Variable Frequency Drive (VFD) fed by a multi-cell inverter. This digital control is characterized by a very fast transient...
This paper presents the application of a sensorless direct torque control (DTC) for an induction motor, using an improved H-Bridge multilevel inverter with 27-Levels. The inverter topology reduces the power sources from nine to only four active sources and three ultracapacitors. The power sources are unidirectional and non-redundant; scaled in power of three to optimize the number of voltage levels...
Inverter dead-time effects have been investigated in detail in the past for three-phase drives supplied from a three-phase voltage source inverter (VSI). A similar study has never been conducted in conjunction with multi-phase (more than three phases) drives, supplied from multi-phase VSIs. Regardless of the type of ac machine and its number of phases, the power supply of the drive is typically a...
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