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An example of the design and implementation of the sensor vector control system with the synthesis of speed and current regulators for the induction motor, which can be used in laboratory and practical classes is considered. The structure of vector control system of induction motor with orientation on the vector of the rotor flux is proposed. Special attention is paid to the possibilities of using...
Stator-slot magnetic wedges are used instead of conventional epoxy glass wedges in large, high-output induction motors since the motor efficiency and power factor can be improved. However, cases of loose or missing magnetic wedges due to their weak mechanical strength have recently been increasingly reported. Although missing wedges can deteriorate motor performance and reliability, there is currently...
The mathematical models of the induction machine (IM) developed on the basis of the experimental frequency-response characteristics at standstill condition (SSFR) are proposed in this paper. At zero speed the transfer function of (IM) is used to obtain an exact linear parametric model. The latter ones are recommended for investigating the transient processes occurring at connections of (IM) to the...
While permanent magnet motors are increasingly being utilized in high performance and high power-dense drives, the induction motor is still almost universal for new electric train drives and gaining popularity in vehicular drives. This is on top of their traditional role as an industrial drive motor for pumps and fans and also their use in servos. The key to good control of these motors is accurate...
This paper depicts an automatic procedure using MATLAB software to plot circle diagram of an induction motor (IM), namely wound rotor, from no-load and blocked rotor tests. The interest of this approach is to avoid direct test load for predetermining the IM characteristics under reduced powers. Besides, to verify the validity of the equivalent circuit parameters deduced from experimental tests, the...
The paper deals with methods and algorithms for the estimation of the induction motor equivalent circuit parameters starting from the geometrical and electrical data generally available after an electromagnetic design. The main aim of the paper is to help the readers to pass from the theoretical analysis to numerical code suitable to be included in own design software. For this reason, the step-by-step...
The realization of a vector control for the operation of induction motors often takes advantage of ordinary equivalent circuit models. Some simplified models are consisting of a reduced number of system parameters and allow a very basically identification procedure by no-load tests in the lab. Fictive identification tests could fortunately be carried out by the finite element method during the development...
The model equivalent circuit is identified. From motor manufacturers test report, parameters Ra, and Xm are calculated. The rotor parameters X12, X1, X2 ,R1, R2 and stator parameter Xa are determined by using direct search optimization method. The starting and running performance values are calculated and compared with available values. From estimated parameters, the transient and sub-transient reactance...
This paper proposes a sensorless rotor temperature estimator for small to medium size mains-fed induction machines. With measurements obtained from only current and voltage sensors, the proposed estimator can capture the rotor temperature in an online fashion. First the rotor speed is extracted from the current harmonic spectrum based on the estimated rotor slot and eccentricity harmonic frequencies...
This paper proposes a cascading motor parameter estimation scheme to obtain an online estimate of the rotor temperature for a small to medium size mains-fed induction machine. The stator winding resistance at ambient temperature is the only motor parameter needed as an input. First the inductances are estimated according to the equivalent circuit developed from the rotor flux field orientation. Then...
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