Phase Synchronous Machine Research Articles

Investigate the performance characteristics of three phase synchronous machine

The paper presents a step by step procedure to identify the parameter values of synchronous machines and determine the equivalent circuit. Furthermore the study expands to exam the performance characteristics of the machines. In other wards study the three phase synchronous machines behaviour in steady-state or dynamic behaviour. The results are exposed that the advantage of three phase synchronous machines and why three phase synchronous machines have been used for widely range in electrical system applications and network grid. Usual standards recommend different tests on a platform in order to determine these parameters. This report include the result of tests at open circuit characteristic (OCC) and short circuit characteristic (SCC) of the machine, open loop voltage/frequency (V/F) control mode of the drive system, operating with high frequency PWM (pulse width modulation), exhibits the impact of load changes on the synchronous motor with a fixed field excitation by plotting the phasor diagram and impact of varying field excitation on the synchronous motor with fixed load in terms of V-curves. Furthermore the correlation between current, excitation and torque is investigated. The purpose of this experiment is to obtain the machines parameters experimentally and comparing with manufacture data sheet. Eventually, discussing the obtained results for all milestones individually.

Virtual laboratory to conduct slip test of synchronous machine

The educational system is presently undergoing a substantial change to improve the teaching-learning process of all engineering domains. This includes the utilization of user-friendly simulation tools as part of the laboratory for an enhanced practical experience on a virtual platform. Owing to the advantages of virtual experimentation, engineering laboratories are now preferably integrated with suitable simulation tools. This paper deals with the integration of simulation tools with undergraduate courses of electrical machinery. For this purpose, a simulation model was developed to conduct the slip test on a three phase synchronous machine on a virtual platform using MATLAB or Simulink for the determination of direct axis reactance Xd and quadrature axis reactance Xq . From the test results, a close relationship between the calculated value of synchronous reactance and rated parameters of the machine is observed, showing the acceptability and suitability of conducted test for the integration of virtual platform with laboratory session. Concept of virtual laboratory may be extended to undergraduate course of electrical machinery during teaching-learning process.

Phase Shift Technique to Improve Torque of Synchronous Reluctance Machines With Dual M-Phase Windings

This article proposes a torque improvement method for dual <i>m</i>-phase synchronous reluctance machines by phase shift technique. The emphasis is put on the relationship of <i>d</i>&#x2013;<i>q</i> axis inductance harmonics and phase shifts. First, all feasible phase shifts for various slot&#x002F;pole combinations are discussed in general. Second, the influences of phase shift on reluctance torque performance are investigated based on inductance analysis. It is founded that the first main torque harmonic can be eliminated when phase shift equals to <i>&#x03C0;</i>&#x002F;2<i>m</i> (<i>m</i> is odd) and <i>&#x03C0;</i>&#x002F;<i>m</i> (<i>m</i> is even), respectively. This is the optimal phase shift covering all the <i>m</i> cases. Third, the optimal phase shift with torque improvement and ripple reduction is verified by the theoretical analysis and finite element method. Finally, the dual 3-phase 24-slot&#x002F;10-pole synchronous reluctance machines with 30&#x00B0; and 60&#x00B0; phase shifts are fabricated. The experiments on the prototype machine are carried out for validation.

Performance Improvement of Existing Three Phase Synchronous Reluctance Machine: Stator Upgrading to 5-Phase With Combined Star-Pentagon Winding

This paper investigates the performance of 3-phase synchronous reluctance machines (SynRMs) when upgrading their stator to 5-phase, keeping the same rotor. The design of the 5-phase stator has been optimized to select the optimal dimensions of the slots and teeth. Moreover, a combined star-pentagon winding is employed to further improve the machine performance. Different winding configurations have been studied and compared using 2D Ansys Maxwell transient simulations. It is observed that at optimal current angle and rated current, the average torque is increased by 17.41% when changing the 3-phase stator with the proposed 5-phase one. In addition, the efficiency of the 5-phase SynRM is increased by about 0.8% compared to 3-phase SynRM. At 3 times the rated speed, the torque and efficiency are significantly increased by around 33% and 3.5% respectively. Moreover, the 5-phase SynRM shows a superior performance in the faulty case with one phase opened. It works at 98.84% of the rated torque of the healthy 3-phase machine, whereas the 3-phase machine works at only 43.35% with huge torque ripple (228%). Finally, an experimental validation using the reference 3-phase machine has been done.

Comparative study of classical and fuzzy -regulator in five phase synchronous machine control with open phase

Comparative study of classical and fuzzy -regulator in five phase synchronous machine control with open phase

Six Phase Synchronous Machine with AC and DC Stator Connections, Part I: Equivalent Circuit Representation and Steady-State Analysis

This paper describes a detailed circuit representation of a six phase synchronous machine wherein mutual leakage couplings between the two sets of three phase stator windings are included. The main modes of power transfer of a six phase machine with sinusoidal inputs are examined. A harmonic phasor method of steady-state analysis to obtain the current, voltage and torque waveforms of a six phase machine with mixed AC-DC stator connections is described. It is shown that the output waveforms for various operating conditions from a digital computer program using the harmonic phasor method agree remarkably well with those obtained from an established detailed analog simulation.

Six Phase Synchronous Machine with AC and DC Stator Connections, Part II: Harmonic Studies and a Proposed Uninterruptible Power Supply Scheme

The relationships of the mutual leakage inductances with winding displacement angle and pitch for a number of practical six phase winding configurations are derived. The voltage harmonic distortion and torque pulsation of a six phase machine with AC-DC stator connections are characterized in terms of the operating load conditions, winding displacement angle, pitch, converter commutating reactance, and rotor impedance. It is shown that for most operating conditions a displacement angle of 300 appears to be optimum with respect to voltage harmonic distortion and torque pulsation. The effects of neglecting the mutual leakage coupling on the voltage harmonic distortion, torque pulsation and transient characteristics of the machine are examined. A novel application of the six phase machine in an uninterruptible power supply scheme is proposed. Results on the dynamic performance of the proposed UPS scheme to input voltage spikes and to a normal supply interruption are included.

Six-Phase Synchronous Machine with ac and dc Stator Connections, Part I: Equivalent Circuit Representation and Steady-State Analysis

This paper describes a detailed circuit representation of a six phase synchronous machine wherein mutual leakage couplings between the two sets of three phase stator windings are included. The main modes of power transfer of a six phase machine with sinusoidal inputs are examined. A harmonic phasor method of steady-state analysis to obtain the current, voltage and torque waveforms of a six phase machine with mixed AC-DC stator connections is described. It is shown that the output waveforms for various operating conditions from a digital computer program using the harmonic phasor method agree remarkably well with those obtained from an established detailed analog simulation.

SIMULATION OF A SYNCHRONOUS MACHINE WITH AN OPEN PHASE

ABSTRACT Techniques are described for simulating an open circuit of a three phase synchronous machine using Park's equations. Set forth in detail is an exact analytical technique that results in an all-dq0 simulation eliminating entirely the need for matrix inversion inherent to the commonly used phase variable approach. In addition, it is shown that this method of simulation markedly reduces the computation time. This work sets the stage for an all dq0 simulation of unbalanced operation of power systems wherein variable step size integration may be employed to full advantage. Also reported is the application of this technique to the simulation of a single phase synchronous machine.

三相同期機オペレーショナルリアクタンスの電磁構成ならびに突発短絡電流の解析解

三相同期機オペレーショナルリアクタンスの電磁構成ならびに突発短絡電流の解析解