Abstract
In this paper, we study the control algorithm of electromagnetic torque and rotation speed of squirrel-cage induction electromotor with constant magnetization current. We can ensure the constant magnetization current by acting on stator voltage vector. We distinguish two methods of construction of the given magnetization current. The first method is based on variation of stator voltage amplitude from the information just of rotor rotation speed. The second method is based on the stator voltage frequency and amplitude from the stator current information. The second method permits to influence the characteristic equation roots of the control system and to have magnetization current dynamic properties.
Highlights
Direct torque control (DTC) of induction motors has gained popularity in industrial applications mainly due to its simple control structure from its first introduction in 1986 [1]
The control of squirrel-cage induction electromotor assumes the stabilization of magnetization current by action on stator voltage vector
The stabilization of magnetization can be achieved through stator voltages vector as functions of angular stator voltage frequency and rotor rotation speed
Summary
Direct torque control (DTC) of induction motors has gained popularity in industrial applications mainly due to its simple control structure from its first introduction in 1986 [1]. A DTC scheme achieves the closed-loop control of the motor stator flux and the electromagnetic torque without using any current loop or shaft sensor. Galvanically isolated current sensors such as Hall-effect sensors and current transducers are widely used in many applications [8], [9] They are typically used on, at least, two outputs of the power inverter to provide current feedback signals. Other strategies introduce modifications of the modulation algorithm in order to guarantee the reliability of the measurements from the dc-link current sensors under all the operating conditions [16]-[18] .Other interesting approaches are based on the estimation of the motor phase currents using predictioncorrection algorithms, introducing additional computational burden to the drive system [19] – [22]. The frequency transducer has a high fast action, that is considerably greater than the speed of electromagnetic processes in induction electromotor
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