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In this paper, the effect of variation of angle between the magnetic field axes of armature field and PM rotor field on armature reaction and performance of a Hybrid Permanent Magnet Induction Machine (PMIM) is presented. The variation of resultant air gap flux density and torque-slip characteristics of the machine for different angle between the magnetic field axes were obtained using Finite Element...
A dual-rotor Hybrid Permanent Magnet Induction Machine (PMIM) having high torque and high power capability and possessing the advantages of both PM synchronous and induction machines can be a suitable option for electric vehicle application. This paper deals with the performance analysis of various possible topologies of PMIM and a conventional Squirrel Cage Induction Machine (SCIM) along with their...
One of the common faults encountered in 3 Phase squirrel-cage induction motors (IM) is broken rotor bar faults which constitutes nearly 7% of all the IM failure. In this work, a study on the electromagnetic characteristics of open-loop pulse width modulated (PWM) inverter fed IM is carried out under healthy condition & broken bar fault condition using Finite Element Method (FEM) analysis. The...
This paper elaborates the use of instantaneous voltage control method for control of torque in a five phase induction motor drive. In this method, instantaneous time modulating signals are generated, without the feedback of position of rotor, which enhances its easier implementation. These modulating signals being compared with triangular waves gives the required switching states input to the inverter...
Conventional direct torque control (DTC) of BLDC motor drive is quite cumbersome, because it operates on trapezoidal back EMF. The conventional DTC gives high torque ripple and switching frequency is variable due to bang-bang controllers. In this article, a new direct torque control scheme is proposed to a BLDC motor. This paper focuses to provide better direct torque control mechanism without using...
Performance of interior magnet PMSM motor depends on the magnet shape and the flux guides in the rotor. Rotor surface profiling affects the reluctance in the machines thus changes the direct (Ld) and quadrature (Lq) axes inductances of the motor. Effects of different magnet configuration, rotor surface profiling and variations in flux guides on important performance parameters like output 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...
This paper describes a generalized method to develop steady state model (SSM) of different electric motors comprising electric equivalent circuit (EEC) and the torque equation. In most of the books on electric motors, EEC is used to explain operation and performance characteristics of motors, but the development of these EECs is not explained convincingly. This work overcomes this shortcoming by specifically...
For an electric vehicle, motor selection is very important as it mainly determine its efficiency, cost and reliability. A particular motor may behave differently under different driving conditions. The driving behavior for an urban and suburban region is represented by its drive cycle. Thus, motor must be analyzed based on different drive cycles. In this paper, analysis of an induction motor for different...
Dual Rotor Motor (DRM) can be a very suitable option for electric vehicle application due to its compact size, high torque and high power density. In this paper, an analytical model of DRM is developed, from where the steady state torque equation is investigated for different firing angle of the inverter feeding the motor. The finite element analysis of the same machine is performed to validate the...
This paper presents an improved dynamic model with incorporating the saturation effects for an induction motor (IM). The improved model is simulated with MAT-LAB/SIMULINK software for transient response in terms of electromagnetic torque, rotor speed and stator current at no-load and on-load. The obtained simulated results provide a clear evidence that the conventional unsaturated model fails to predict...
Selection of a particular motor type for electric vehicle application is a very challenging task. Dual rotor motor (DRM) drive train due to its high torque density and compact size in comparison to drive trains with multiple motors has emerged as a potential alternative to conventional motor types such as permanent magnet motor and induction motors. Due to the presence of three magnetically coupled...
The use of multiobjective optimization technique in determining the values of the steady-state equivalent circuit parameters of a three-phase squirrel-cage induction machine is discussed. The identification procedure is based on the steady state phase current versus slip and torque versus slip characteristics. Nonlinearities in the Induction machine such as saturation effects and skin effects are...
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