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Misalignment is one of the most common mechanical faults in electrical rotating machinery, it can lead to partial or total breakdown of a motor in the long run may. This paper investigates the application of the Autoregressive Model of torque signal to detect and diagnose the misalignment fault. First, the torque signal obtained from experiment in different conditions: healthy condition, angular misalignment,...
This paper proposes a methodology for torque and efficiency estimation of in-service induction motors based on the Air-Gap Torque (AGT) method. The proposed methodology only relies on induction motor stator voltages, currents and nameplate data. A modified stator resistance is estimated including the mechanical losses effect. This modified stator resistance is estimated by using a Differential Evolution...
AC drives based on full digital control have reached the status of a maturing technology in a broad range of applications, ranging from low-cost to high performance systems. In the field of the drive of the electric machines, the elimination of the mechanical speed sensor can present an economic interest and improve safety of operation. With speed estimation, sensorless vector control is possible,...
Current drivetrain design procedures for electric actuation systems operating in offshore conditions typically consider two major requirements: to provide sufficient steady-state and maximum motor torques. As a result of this, no information regarding the transient state (e.g. during motor acceleration) is utilized when selecting drivetrain components. This leads to potentially dangerous situations...
This paper uses an easy technique to calculate directly the parameters for induction motors, using single- and double-cage models. This technique has been applied in a wide sample of 2167 induction motors, where the parameters have been calculated from manufacturer data. The results show that this technique provides large errors in the start and maximum torque points, but on the other hand, it provides...
In last years the hardware in the loop (HIL) feature, that is offered by FPGA devices through the Xilinx System Generator (XSG) and Matlab-Simulink has presented a helpful way to test and validate control diagrams. The present paper exploits this feature to implement the Direct Torque Control (DTC) for induction motor. The SPARTAN-3E FPGA device is used for the hardware validation.
This paper proposes a novel control approach which integrates optimal operation and direct torque control (DTC) for motors in a building lift system. The optimal control and operation of lifts is based on fuzzy logic based on the real time data inputs such as original level, destination level, call level, etc. The DTC is used in the motor controller. The fuzzy PID controller in DTC is designed to...
MATLAB / SIMULINK implementation of the Direct Torque Control Scheme for induction motors is presented in this paper. Direct Torque Control (DTC) is an advanced control technique with fast and dynamic torque response. The scheme is intuitive and easy to understand as a modular approach is followed. A comparison between the computed and the reference values of the stator flux and electromagnetic torque...
Induction motors are presently used in many electric vehicle applications. As a result, their control methods have received a lot of attention. One of the efficient method of induction motor control is the direct torque control (DTC). In this paper, a design method for direct torque control of induction motor has been developed. A Verilog hardware description language is used to implement the developed...
The paper proposes a symmetrical six-phase PMSM two-motor drive system which consists of a six-phase PMSM series-connected with a three-phase PMSM driven by a single inverter. This enables full decoupling vector control of the two machines. Detailed mathematical modeling of the system is presented. A simulation model with vector control is constructed by Matlab/simulink. The simulation results show...
The self-starting of induction motors in electric networks auxiliaries of electric stations under different types of short-circuits was researched using the methods of mathematical experiments and digital models.
This paper presents a dynamic regime analysis of the starting and function of the two-phase asynchronous motor with two non-orthogonal stator windings. Simulation results are obtained when the axis of the auxiliary winding is moved with 30 degrees in decreasing and increasing way. The answer concerning optimal choice of the two-phased motor for household applications is given by the results of the...
This paper proposes the extending application of permanent magnet synchronous machines (PMSMs) without damping windings, or non-line-start PMSMs (NLSPMSMs) to achieve effective soft start and synchronous switching from inverter drive to grid drive. The system electromechanical model during switching is deduced, and numerical analysis is adopted to verify the stability under grid drive. For the control...
Using electric motors with a number of phases greater than three may present some advantages over conventional three phase machines in the following applications: high power levels, electric vehicles and applications that require high levels of reliability. Multiphase machines, meaning designs comprising more than three phases, also allows an increase in torque density from the injection of harmonic...
In this paper a developed universal system for testing of electrical motors will be described. The research of stator and rotor faults of induction motors has a need for measurements of good and damaged motors under various loads and power supply conditions. This new diagnostic system allows a fully automatic measurement of all relevant values, like supply voltage, stator currents, shaft speed and...
In an inverter, the number of legs can be increased to any number. So, any number of phase voltages can be generated with proper firing pulses. In this work, a five phase machine is modeled and simulated in MATLAB / Simulink. The space vector modulation (SVM) technique is applied to the proposed model for its torque control. The torque control characteristic obtained using SVM based DTC is compared...
To remain competitive, the manufacturing industry is always innovating and developing new cost-efficient ways to produce goods. That is why today, extensive automation is applied in nearly every type of manufacturing and assembly processes. Automation improves productivity, quality and robustness of products. It also increases the predictability of production lines mainly constituted of asynchronous...
This paper, deals with a new input-output sliding mode linearization control for induction motor combined with field oriented control (FOC). To control the speed and rotor flux modulus, we develop two loops. The first one, inner loop, allows to linearize the system by a choose of closed loop poles to achieve a good linearization. The choice of a particular sliding surface permits to create a link...
Mechanical faults present a large portion of induction motor failures, if left undetected, it can lead to partial or total breakdown of the machine. This paper propose a scheme to detect and diagnose mechanical faults in an induction motor by the AR model coefficients of the Torque signal. First, the torque signal obtained from experiment in different conditions: healthy condition, motor with dynamic...
This research represents a study of the effects of internal and external disturbances for the developed hybrid fuzzy-fuzzy controller (HFFC) scheme to gain control over the speed of an induction motor's (IM) variable speed drive (VSD). In case of an induction motor, the fuzzy current amplitude control and fuzzy frequency control are observed in a closed-loop current amplitude input model. A hybrid...
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