Single Induction Motor Research Articles

Result Paper on IOT Based Induction Motor Speed Control and Parameter Monitoring

Abstract: Today’s application of single phase induction motor is increased due to it simple operation and availability of single phase supply in every place. The single phase motor available in different rating, Different speed and used for different application. The single induction motor is used for particular operation need to protect motor and need to control parameters of single phase induction motor and monitor this data to user operator. This is possible with help of IOT in this project single phase induction motor parameter monitoring and speed control is done through IOT base system. In this project the parameters of the motor is continuously recorded and send to the user operator through the cloud internet to end user application module. Keywords: Induction Motor, IOT, Speed Control, Monitoring etc.

Electrical–mechanical evaluation of the multi–cascaded induction motors under different conditions

This article pays particular attention on the operation and process of energy conversion in cascaded induction motors worked under balance and unbalance circumstances. In this study, we considered the multi induction motors, which are coupled as mechanically in form of cascade mode with the same capacity. Moreover, a Single Induction Motor (SIM), which its capacity is sum of the capacity of all Multi–Cascaded Induction Motors (MCIMs), are considered for comparing the results. In operation time, unbalancing can be happen in the individual of the given voltage and frequency. The effects of the balance voltage and unbalanced frequency on highest and stable torque, power factor, active as well as reactive input powers, ohm losses, and finally, Total Harmonic Distortion (THD) in current and voltage have been examined. This study shows that motor operation and effectiveness are enhanced by presenting more electrical benefits of the MCIMs. The results depicts the highest torque of MCIMs in comparison with SIMs. In addition, the copper loss is decreased when the MCIM is used instead of SIM. As a result, the energy conversion procedure were remarkably enhanced.

Effective Model Predictive Control Approach for a Faulty Induction Motor Drive

The paper presents an effective model predictive control (MPC) technique to enhance the performance of the induction motor (IM) drive under open phase fault condition. The mechanism of the proposed MPC approach is based on the stator field oriented control (SFOC) principle in which the stator flux is aligned to the direct axis of the rotating reference frame. In order to apply the proposed MPC approach on the faulty IM drive; the mathematical model of the IM is reconstructed to take the fault effect into account and for this purpose the single phase IM equivalent circuit is utilized. In order to improve the stator flux prediction process, an effective flux estimator is presented as an alternative to that one which uses a low-pass filter (LPF). The finite control set (FCS) principle is used to select the optimal voltages to be applied to the motor directly from the specified eight voltage vectors, which enables the elimination of the pulse width modulation (PWM). To testify the effectiveness of the proposed MPC in enhancing the dynamic performance of the IM drive under the fault condition; the IM drive performance under the proposed MPC is compared with the drive performance when applying the traditional predictive torque control (PTC). The obtained results confirm and emphasize the superiority of the proposed MPC in reducing the accompanied mechanical oscillations in the rotor speed and in eliminating the ripple contents in the controlled variables and enhancing the ability of the IM drive in riding through the fault.

Estimation of composite load model with aggregate induction motor dynamic load for an isolated hybrid power system

It is well recognized that the voltage stability of a power system is affected by the load model and hence, to effectively analyze the reactive power compensation of an isolated hybrid wind-diesel based power system, the loads need to be considered along with the generators in a transient analysis. This paper gives a detailed mathematical modeling to compute the reactive power response with small voltage perturbation for composite load. The composite load is a combination of the static and dynamic load model. To develop this composite load model, the exponential load is used as a static load model and induction motors (IMs) are used as a dynamic load model. To analyze the dynamics of IM load, the fifth, third and first order model of IM are formulated and compared using differential equations solver in Matlab coding. Since the decentralized areas have many small consumers which may consist large numbers of IMs of small rating, it is not realistic to model either a single large rating unit or all small rating IMs together that are placed in the system. In place of using a single large rating IM, a group of motors are considered and then the aggregate model of IM is developed using the law of energy conservation. This aggregate model is used as a dynamic load model. For different simulation studies, especially in the area of voltage stability with reactive power compensation of an isolated hybrid power system, the transfer function ΔQ/ΔV of the composite load is required. The transfer function of the composite load is derived in this paper by successive derivation for the exponential model of static load and for the fifth and third order IM dynamic load model using state space model.

Non‐intrusive induction motor speed detection

This paper presents an algorithm that enables estimation of the speed of a single induction motor in an aggregate current signal supplying several motors from a common utility feed. This algorithm maintains accuracy of speed estimation while using shorter lengths of data, and can distinguish the activation of individual motors in the aggregate signal. The ability to separate and track distinct motor harmonics in an aggregate current signal opens the door to non-intrusive energy scorekeeping and diagnostics for systems like air conditioning that operate under closed-loop control. New experimental results demonstrate the approach for these air-conditioning components in real buildings.

A Novel Scheme for Reduction of Torque and Speed Ripple in Rotor Field Oriented Control of Single Phase Induction Motor Based on Rotational Transformations

This study discusses about an exact and novel scheme for Rotor Field Oriented Control (RFOC) method in single phase Induction Motors (IMs) with two different main and auxiliary stator windings. In the presented technique, rotational transformations are introduced and applied to the single phase IM equations. It is proved by using these proposed rotational transformations, asymmetrical equations of single phase IM changed into symmetrical equations. As a result, with some modifications in the conventional field oriented controller, vector control of single phase IM can be done. Results are presented to show the good performance of the presented technique.

Three-Phase Modeling for Transient Stability of Large Scale Unbalanced Distribution Systems

The transient stability of a distribution system containing rotating machines is usually evaluated by considering a symmetrical disturbance applied to a balanced network. Hence, most, if not all, available algorithms and stability programs use the bus admittance matrix for the positive sequence only. However, a typical distribution system may contain untransposed feeders, single-and/or three-phase unbalanced static shunt loads, single-and/or three-phase dynamic loads (such as induction motors), co-generators, transformers and capacitor banks. Furthermore, even if the network is balanced, unsymmetrical faults introduce unbalance. The effects of unbalances on the transient behavior of a single induction motor in a two-bus system using simultaneous nodal voltage equations has been recently investigated. It was concluded that a significant error may occur by replacing an unbalanced shunt load by an averaged balanced load and by assuming an unbalanced feeder to be an equivalent balanced feeder. This paper extends the previous investigation to large scale networks using a generalized three-phase bus admittance matrix [Ybus] method which takes care of the unbalances referred to above. Developing the three-phase [Ybus] itself is not new, but the novelty of the proposed method lies in the combination of the three-phase [Ybus] with the dynamics of rotating machines in transient stability studies of large networks using step-by-step integration of nonlinear differential equations. The method utilizes phase frame representation of network and machine elements. In order to be general, the computer program allows the user to include synchronous generators, induction motors, transformers, feeders and static loads.

Frequency-dependent dynamic, representation of induction-motor loads

For comprehensive transient and dynamic stability studies, induction-motor loads have usually been represented by fixed shunt impedances at system nominal frequency. A method is proposed here which allows single induction motors or groups of induction motors to be considered as frequency-dependent and dynamic. If the necessary parameters of the motors are known and if computation effort is not a problem, accurate assessment can always be made for single machines or groups of machines but may involve lengthy calculations. Alternatively, an approximate, rapid method is presented which gives the change in active-power input to an induction motor or group of induction motors due to inertia and frequency-variation effects to within ±2% of the actual change for known power factor, inertia factor and full-load slip; and to within ±5% of the actual change when the assumed parameters are within the following limits: power factor within ±5% inertia factor within ±10% and full-load slip within ±20% (where the actual change in power has been assessed by the use of an equivalent circuit). The change in reactive power, as assessed, is within ±20% of actual change in reactive power. ±5% change in operating frequency has been considered. For simplicity, windage and friction losses have been taken as an integral part of the load supplied by the motor, and core losses have been assumed constant. These methods can be applied to power-system stability studies, as illustrated by an example.