Investigation of Temperature Rise in an Induction Motor Considering the Effect of Loading
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This paper presents an investigation into the temperature rise in induction motors used to power machine tool spindles by considering the effects of loading. To develop a second-order fitted power-loss distribution model for the constant-torque operating range of the induction motor, we employed the design of experiment and response surface methodology techniques. In particular, the way in which the temperature of the induction motor rises is calculated using an equivalent thermal resistance model. Finally, the analysis results were experimentally verified, and the validity of the proposed analysis method was confirmed.Keywords:
Constant (computer programming)
This paper describes the speed sensorless vector control method of the parallel connected induction motor drive fed by a single inverter. Speed and rotor fluxes of the induction motor are estimated by natural observer with load torque adaptation and adaptive rotor flux observer. The performance parameters speed and rotor fluxes are estimated from the measured terminal voltages and currents. Fourth order induction motor model is used and speed is considered as a parameter. The performance of the natural observer is similar to the conventional observer. The speed of an induction motor is estimated by MATLAB simulation under different speed and load conditions. Estimated values along with other measured states are used for closed loop control. The simulation results show that the natural observer is also effective for parallel connected induction motor drive.
Observer (physics)
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A new sliding mode (SM) observer-based controller for single-phase induction motor is designed. The proposed control scheme is formulated using block control feedback linearization technique and high-order SM algorithms with measurements of the rotor speed and stator currents. The stability of the complete closed-loop system, including the rotor flux second-order SM observer, is analyzed in the presence of model uncertainty, namely, rotor resistance variation and bounded time-varying load torque.
Observer (physics)
Feedback linearization
Linearization
Wound rotor motor
Machine control
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In this paper, a technique of robust control for an induction motor is presented. This motor is fed by five-level inverter controlled by the triangulo-sinusoidal strategy with four bipolar carriers. The control algorithm uses robust regulators calculated by the H infin loop shaping approach associated with indirect field oriented control. The sliding mode observer is used to observe the rotor flux in the induction motor. The simulation results show that the controllers stabilize the system and reject the disturbances when the system is subjected to uncertainties, which theirs norms are lower than the maximum stability margin
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Mode (computer interface)
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This paper proposes a new flux and speed sliding mode controller for sensorless induction motor. A combined controller and observer design allows, under parametric uncertainties, to achieve the tracking of rotor flux and mechanical speed for induction motor without the need of flux, speed and load torque measurements. Based on Lyapunov theory, firstly the stability of the proposed controller is given. Secondly, the stability of the proposed observer is proved and then the proof of the whole closed-loop system stability "controller+observer" is given under induction motor parametric uncertainties. Furthermore, due to the complexity of observation at low frequencies, the proposed controller using an observer is tested and validated on reference trajectories of a sensorless induction motor control benchmark. This benchmark is applied on an experimental set-up located at IRCCyN (Nantes, France). The applicability of the designed controller is emphasized by the robustness experiment tests with respect to parameters variation of induction motor.
Robustness
Open-loop controller
Observer (physics)
Electronic speed control
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Direct torque control (DTC) of an induction motor fed by a voltage source inverter is a simple scheme that doesn’t need long computation time. The motor terminal voltages and currents are sampled to estimate the motor flux linkage and electromagnetic torque using a flux observer. The main advantage of DTC technique is that it isn’t sensitive to the variation in motor parameters except the stator resistance in its flux observer especially at low speed operation. In this paper, two observers are used for online stator resistance identification for the DTC flux observer, one observer based on fuzzy logic while the other is based on ANFIS algorithm. The saturated p model of the induction motor is used which is more practical than the approximate linear model especially in the large motors. The authors also introduced a speed observer based on Lyapunov design and compared with another observer based on ANFIS design as well as the classical flux observer used with DTC technique. Simulation results show that the observers are validated and give a good performance in the different operating conditions. Also the authors have found that the ANFIS observer gives good performance as well as the Lyapunov and fuzzy observers.
Observer (physics)
Flux linkage
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Бұл зерттеужұмысындaКaно моделітурaлы жәнеоғaн қaтыстытолықмәліметберілгенжәнеуниверситетстуденттерінебaғыттaлғaн қолдaнбaлы (кейстік)зерттеужүргізілген.АхметЯссaуи университетініңстуденттеріүшін Кaно моделіқолдaнылғaн, олaрдың жоғaры білімберусaпaсынa қоятынмaңыздытaлaптaры, яғнисaпaлық қaжеттіліктері,олaрдың мaңыздылығытурaлы жәнесaпaлық қaжеттіліктерінеқaтыстыөз университетінқaлaй бaғaлaйтындығытурaлы сұрaқтaр қойылғaн. Осы зерттеудіңмaқсaты АхметЯсaуи университетіндетуризмменеджментіжәнеқaржы бaкaлaвриaт бaғдaрлaмaлaрыныңсaпaсынa қaтыстыстуденттердіңқaжеттіліктерінaнықтaу, студенттердіңқaнaғaттaну, қaнaғaттaнбaу дәрежелерінбелгілеу,білімберусaпaсын aнықтaу мен жетілдіружолдaрын тaлдaу болыптaбылaды. Осы мaқсaтқaжетуүшін, ең aлдыменКaно сaуaлнaмaсы түзіліп,116 студенткеқолдaнылдыжәнебілімберугежәнеоның сaпaсынa қaтыстыстуденттердіңтaлaптaры мен қaжеттіліктерітоптықжұмыстaрaрқылыaнықтaлды. Екіншіден,бұл aнықтaлғaн тaлaптaр мен қaжеттіліктерКaно бaғaлaу кестесіменжіктелді.Осылaйшa, сaпa тaлaптaры төрт сaнaтқa бөлінді:болуытиіс, бір өлшемді,тaртымдыжәнебейтaрaп.Соңындa,қaнaғaттaну мен қaнaғaттaнбaудың мәндеріесептелдіжәнестуденттердіңқaнaғaттaну мен қaнaғaттaнбaу деңгейлерінжоғaрылaту мен төмендетудеосытaлaптaр мен қaжеттіліктердіңрөліaйқын aнықтaлды.Түйінсөздер:сaпa, сaпaлық қaжеттіліктер,білімберусaпaсы, Кaно моделі.
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Cascade and high-gain observers based on interconnected form to estimate the mechanical and magnetic states of sensorless induction motor drives are considered. Furthermore, a flux and speed sliding-mode controller is proposed and combined with the observers to achieve the tracking of rotor flux and mechanical speed for induction motor without the need of flux, speed and load torque measurements. On the basis of the Lyapunov theory, the stability analysis of the proposed observers, the controller and the closed-loop 'observer+controller' are given. The observers, combined with the controller in closed loop, are compared in terms of their speed-tracking capability and their sensitivity to parameter variations on reference trajectories of a sensorless induction motor control benchmark, particularly when the induction motor state is unobservable. This benchmark is applied on an experimental set-up located at IRCCyN (Nantes, France).
Open-loop controller
Electronic speed control
Observer (physics)
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This paper presents a sensorless torque estimation algorithm for multidegree-of-freedom flexible systems. The proposed algorithm makes it possible to estimate externally applied torques due to flexible system's interaction with the environment without taking any measurement from the system. The algorithm is based on modifying the disturbance observer in order to decouple the reflected torque waves out of the total disturbance on the actuator. Then Reflected torque waves are used along with the actuator's current and velocity to estimate flexible system parameters, dynamics and the external torques or disturbances. Several experimental results are included in order to confirm the validity of the proposed torque estimation algorithm.
Observer (physics)
Damping torque
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Thermal analysis is an important design aspect and becoming a more important component of the electric motor design process due to the push for reduced weights and costs and increased efficiency. The accuracy of analytical thermal models depends on the accuracy of the thermal resistance computation and on the number of nodes in the equivalent thermal circuit. In this paper several thermal analytical models with different numbers of nodes are compared against with each other and with experimental data. It will be demonstrated that the more sophisticated and detailed model having a larger number of nodes can be used to calibrate the simpler but faster models with less nodes. The models are all for the same range of small TENV induction motors.
Component (thermodynamics)
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This paper presents the space vector modulation (SVM) based direct torque control (DTC) of induction motor fed by a three level neutral point clamped (NPC) inverter. The SVM DTC system avoids the use of the hysteresis controllers and the look up table which are usually used in the classical DTC scheme. A novel sliding mode controller (SMC) is proposed which controls the speed of the induction machine under load torque fluctuations. Performance of the controller is analyzed during the transient and steady state periods. The speed behavior of the system is observed by applying different load torques. The results are compared with that of the conventional PI controller. It is observed that the SMC controllers are robust to parameter variations and can handle non linearities in a better way when compared with a PI controller.
Space vector modulation
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