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The basic spatial modulation effects of induction machines caused by slotting and saturation, have been analyzed for exploitation in speed sensorless control. With increasing load level, additional spatial harmonics arise, acting as disturbance and deteriorating sensorless control performance. In view of the fact, that induction machines for application in traction systems (e.g. public or cargo transportation)...
This paper proposes a method based on signal injection to obtain the saturated current-flux relations of a PMSM from locked-rotor experiments. With respect to the classical method based on time integration, it has the main advantage of being completely independent of the stator resistance; moreover, it is less sensitive to voltage biases due to the power inverter, as the injected signal may be fairly...
Paper derives a procedure of identifying induction machine variable inductance values. Parameter identification is done from measurements during no-load direct start acceleration. Genetic algorithm is used for parameter identification. It is used to minimise least squares difference between calculated and measured data by selecting parameters of induction motor model. Variable inductance is identified...
This paper studies the effect of different slice count on quality of multi-slice simulation. The slices are distributed evenly along the axial length of the machine. The torque and current waveforms at nominal point are analysed for different numbers of slices, and compared with the measured waveforms. Practical optimum is identified finding a trade-off between simulation time and results quality.
This paper presents the modelling and simulation of a low-power Brushless DC machine in a Rotor Flux Oriented mode in MATLAB/Simulink. The modelling of the machine is presented in the synchronous dq frame. Using this model suitable Proportional Integral controllers have been designed for the Rotor Flux Oriented speed and current loops. Sensorless simulation estimates obtained from a back-emf observer...
Precise control methods of the electric drives with induction machines like field oriented control (FOC) or direct torque control (DTC) need an accurate model of the machine they control. Certain parameters of the model have to be obtained with sufficient accuracy before the drive can be put into the operation. This article concerns an offline parameter identification method that is suitable for on-site...
Most Anisotropy based sensorless control schemes are using an additional voltage injection in order to create a measurable current ripple. This injection causes some unwanted side effects such as additional noise and torque oscillations, introduced by the harmonics of the current. This paper proposes an operating point dependent injection in combination with an arbitrary injection scheme in order...
The use of converters to feed motors instead of the direct-on-line supply has increased the need to understand the behaviour of the induction machine in different operating points. The additional losses in frequency converter fed machines are caused by the harmonic content of a PWM voltage excitation. This paper investigates closely the harmonic contents of stator supply voltage and current. Most...
This paper proposes Fault Detection, Isolation and Reconfiguration (FDIR) techniques to realize the connection of a DFIM pumped storage system with the grid in the presence of current and speed sensor failures. For the detection method authors use the parity space approach either for current sensor failure or the rotation speed one. The proposed reconfiguration techniques exploit stator flux estimation...
Induction machines are commonly used in traction applications due to their robustness and lower production costs when compared to the Permanent Magnet Synchronous Motor (PMSM). In such traction applications, the induction machines are mainly operated by field oriented control. This control technique requires an accurate knowledge of the machine's parameters. The accuracy of the parameters influence...
A novel extended state observer (ESO)-based vector control (VC) strategy is developed for permanent magnet synchronous motor (PMSM) drive systems with only one phase current sensor. Generally, to achieve high precision control, two phase current sensors are indispensable for successful operation of the feedback control. In response to a phase current sensor fault, by use of technique of ESO, a new...
This paper analyzes the effects of the load torque oscillations in the signals of current and external stray flux and verifies that the characteristic signatures of this fault are clearly present even in an inverter-fed induction motor. In addition, a method based on the Linear Discriminant Analysis and on the calculation of the first odd harmonics of these signals is proposed for an automatic detection...
The paper investigates the influence of pole-pair number on the mixed eccentricity related fault indicators extracted by means of high-frequency or transient signal injection. The method exploits the transient current response to track eccentricity- and slotting-related machine saliencies. By using the fault indicator's locus, a separation of mixed eccentricity components is performed, without comparison...
Induction motors are the most commonly used prime-movers in industrial applications. Many induction motors supplied by frequency converters are coupled with a physical angular rotor position/velocity sensor which makes the drive complex and require maintenance. This paper presents a sensorless control structure to avoid using a physical angular rotor position/velocity sensor. The proposed method estimates...
This paper proposes a novel technique to estimate online the inductances of a Permanent Magnet Synchronous Machine (PMSM) based on the measurement of the current derivatives excited by two active-voltage vectors and one zero-voltage vector within a PWM cycle. The d- and q-axes inductances of PMSMs are calculated during normal operation of the drive system. The influence of the magnetic saturation...
This paper presents a sensorless control method for IPMSMS drives over a wide speed range operation, including zero speed. The rotor position estimation of this method is based on relating the measured current derivative response which excited from fundamental PWM sequences to the incremental inductance. Compared to other saliency tracking sensorless control schemes, this method doesn't require additional...
Partial Discharges, if initiated give rise to progressive deterioration of insulation material and lowers its life expectancy. If allowed to persist further, PD can even lead to the electric breakdown of insulation. However, in spite of its damaging effects on machine insulation, its application during the production phase of machines, to avoid their permanent failure has gained importance in this...
This paper presents a method for an automatic detection of a stator short circuit and for the estimation of its severity in inverter-fed induction motors, in different conditions of speed and load. The method is based on the Linear Discriminant Analysis and on the spectral analysis of three signals (current of one phase and external stray flux measured with two different sensors). In order to obtain...
Voltage and current sensors integrated in modern electrical equipment can enable extraction of advanced information on the network and the connected devices. While traditional methods for protection and network managements rely upon processing of these signals at low speed, high-frequency processing of the raw current and voltage signals can unveil information about the type of electrical load in...
Almost controllers of induction motor speed are designed to keep motor speed unchanged. It is hard for conventional controller such as PI controller because induction motor is a nonlinear system with parameter changes and noise. Sliding mode control based on reference model is worth trying to overcome that difficulty. This paper presents a new method using sliding mode controller based on reference...
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