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This paper presents a comparison analysis of two electric motors with helical movement of the rotor. These machines are also referred to as machines with two degrees of mechanical freedom. The machines are designed in such a way that the rotor performs rotary-linear movement. The first machine is a permanent magnet synchronous motor. The motor is a combination of two permanent magnet synchronous motors:...
The direct torque control (DTC) is the preferred control technique of the induction motor in electric traction applications. It has advantages, as it is a sensorless control technique, but also disadvantages. The main disadvantage is related to the switching frequency which is the same with the sampling frequency of the entire control loop. This determines high requirements for the control system...
This paper presents the topic of manufacturing the stator winding for small induction motors of aluminium instead of copper. The aspect of replacing the material is presented from the perspective of the producer. It is important to obtain a new motor with the same characteristics and the same energy efficiency while decreasing conductor material price and thus the price per motor unit. For these purpose...
Energy crisis's due to the depletion of fossil fuel and need of pollution free environment has leaded the world automobile technology to switch over to Electrical propulsion system into vehicles. For the consumer expected performance of electrical vehicles proper selection of suitable electric motor is the first and important criterion. So in this studies selection of appropriate motor for electrical...
This paper presents a real-time performance evaluation of direct torque control (DTC) and regenerative braking control of improved z-source inverter fed induction motor drives using field programmable gate arrays (FPGA) based real-time digital simulator (RTDS). RTDS was built using Very High Speed Integrated Circuit Hardware Description Language (VHDL), composing it versatile and compact. The proposed...
This paper presents a predictive direct torque control (PDTC) system with discrete multiple vector voltage (DMVV) and fuzzy hysteresis for a three-phase induction motor. A fuzzy hysteresis controller is proposed to establish a DMVV for estimating both flux and torque errors, which are the membership functions of the fuzzy system. DMVV switching timing ensures that an appropriate voltage vector is...
This paper presents the experimental implementation of V/f scalar control for a three-phase squirrel-cage induction motor. The principal goal is to control the rotation speed set by a reference and to maintain it despite the presence of disturbances. Two implementation methods were developed: Open-loop scheme, which is commonly used in industry, and closed-loop scheme, less used but it offers higher...
The present paper deals with loss minimization for speed controlled squirrel-cage induction machines. In particular, a flatness-based online trajectory planning algorithm for the rotor flux is introduced that ensures loss optimization in transient operating regimes. Therefore, a matched model of the losses being polynomial in the flux is used. For a trajectory of the torque which is a polynomial function...
In this paper two recent presented active grid current stabilisation strategies for direct matrix converter based drives with squirrel-cage asynchronous induction machines are compared with there passive counterparts. While the functionality of the active stabilisation strategies has been proven already this publication focuses on the harmonic distortion of grid and machine current as well as the...
The most critical part of the induction machines which determines on their life time operation are rolling element bearings. To ensure reliable drive with an induction machine requires deep insight in electro-mechanical dynamics during its operation. The flexible multibody modeling technique enables the simulation of dynamic loads on all drive components. This paper focuses on complex dynamic modeling...
In recent years, the diagnosis of electric motors appealed increasingly to signal processing methods. To develop these methods, it is necessary to have a reliable mathematical model of the physical signal to be processed, in our case the signal is the stator current. Unfortunately, often this stator current can only be obtained from an expensive measurement bench, or from a complex modelling of the...
The paper is focusing the comparison of transverse laminated synchronous reluctance motor (TLA) and squirrel cage induction motor for the same power ratings as 4 kW. The motors are general purpose industrial motors which are having the same stator layout but different rotors. The comparison is made in terms of electrical quantities such as induced voltage, current magnetic quantities such as the air...
The use of converters to feed the motors instead of the direct-on-line supply has increased the need to understand the losses of the induction machine in different operating points. Most of the earlier studies have focused on the losses with the nominal supply frequency while this study covers most of the frequency-torque plane below nominal values. A 15 kW standard squirrel-cage machine's losses...
A method for provision of operability of a variable-frequency electric drive with vector control in the presence of breakages in the induction motor stator power electric circuit is presented. Analysis of electromagnetic torque orthogonal components in an analytical form has revealed that the influence of breakages, causing induction motor stator circuits asymmetry, on the electric drive operating...
Induction motor rotor designs are investigated in this paper to reduce secondary winding harmonic losses in hybrid electric vehicle (HEV) applications. The induction motor is more and more popular to use for the traction drive, but its' secondary winding harmonic losses are significantly higher than the usual when having high frequency and high power density in the HEV application. Thus, the major...
To produce an ultra-lightweight motor, we propose a technology that converts electrical energy between the stator and rotor using magnetic coupling. Magnetic coupling causes electromagnetic resonance between the respective multiphase windings of the stator and rotor. Electromagnetic resonance coupling technology allows electric motors to convert energy without magnetic cores, significantly reducing...
This paper presents a design process to integrate a magnetic gear with an induction machines. The resulting integrated machine has the potential to offer a high torque density with asynchronous speed characteristics. Such characteristics may be desirable for applications that require sensorless operation or may be subject to severe backlash or jamming. The paper presents some of the difficulties in...
Vector control of induction motor is preferred as it gives independent control of flux and torque. For vector control knowledge of flux and speed is required. To eliminate the sensors, observers are used to estimate the flux and speed rather than measuring it. Sliding mode approach is popular due to its robust nature and very suitable for nonlinear system. This paper designs a sliding mode observers...
Induction motor is an electric motor which has many advantages. One of them is robust and relatively cheap. But has some disadvantages in the regulation of speed, because of that, the system need smart control to operated the induction motor. in this case used Backstepping control as intelligent control to maximize the performance of induction motor. In this method Indirect Field Oriented Control...
Direct torque control (DTC) based on lookup table is known to have poor flux regulation at low speed that can cause a significant deterioration in the speed estimation of a sensorless drive. In this paper, stator flux regulation at low speed is improved under no load by replacing the hysteresis torque comparator with constant switching frequency controller, without any changes to the conventional...
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