1,721,114 research outputs found
A Speed Sensorless Digitally Controlled Induction Motor Drive Estimating Rotor Resistance Variation
No full text
MICROPROCESSOR VOLTAGE CONTROL OF INVERTER FED ASYNCHRONOUS MOTORS
No full textIn the paper, the torque control of an asynchronous motor fed by a voltage source inverter (VSI) is performed by evaluating, by means of a microprocessor, in each sampling interval the voltage space vector which gives rise to a mean value of the electromagnetic torque just equal to the imposed one. The correspondent modulation technique for the VSI is described. The results obtained by means of a numerical simulation show a very good behavior both in steady state and in transient operation, with particular reference to the accuracy and the quickness of the drive response
Robust Model Reference Control of Induction Motor Drive
No full textA model reference approach to control induction motor drives is proposed. The robustness, against rotor time constant variation, is also assured. Reference is made to CRPWM inverter supply. Thus, a simple linear, time invariant and decoupled reference model is assumed. A non-linear controller which takes into account rotor time constant variation is synthesized resorting to the Lyapunov stability theory. Field oriented control is imposed to the reference model expressed in stator coordinates and computer simulation results are reported. The reference model and its control system has been implemented using operational amplifiers and integrated-circuits chips for generating special functions. The test results of the circuit are finally reporte
Improving the Dynamic Response of Speed Controlled Electrical Drives
No full textAn algorithm suitable for digital speed control of an electrical drive is presented. It performs an instantaneous compensation of the load torque variations, by imposing the drive accelerating torque required to achieve an assigned speed response. In this way an improved dynamic response is obtained. A good robustness to the inertia variations is assured too. The validity of the algorithm and the comparison with traditional control strategies is established by means of a simulation program
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