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Direct Torsion Management Case Study

1858 Words8 Pages

Abstract— Direct torsion management (DTC) may be a superior technique that provides effective management of machine flux modulus and magnetic attraction torsion of electrical motors. However, error in estimation of machine resistance significantly degrades the performance of a DTC drive system, notably for a motor. This paper discusses the problems associated with the error in machine resistance Associate in Nursing proposes AN analytical approach to research its result on the actual and computable variables of a motor. supported but this error affects the computable angle between the machine flux and current vectors, how to trace machine resistance variations is projected. The bestowed analytical technique and also the projected machine resistance estimation square …show more content…

Te and |λs |are 6 N ?m and 1 wb and the bandwidth of their hysteresis controllers are 1 N ?m, and 0.01 wb, respectively.
11.1 Step Change in Stator Resistance: The DTC induction motor drive system without and with the proposed estimation method is studied. Both drive systems initially operate at the correct value of rs. At t = 5s, 2.35-Ω resistors are added in series with each phase of the motor stator. Fig. 8 shows the electromagnetic torque, stator flux modulus, motor speed, estimated angle between stator flux and current vectors, and the actual and estimated stator resistance values.
In contrast, a negative error in ϕiλ results in a positive error in rs. Fig. 9 shows this behavior at different speeds. When the speed decreases, the error in rs caused by the error in ϕiλ decreases. The minimum error in ϕiλ which makes the control system unstable is almost independent of the motor speed. Therefore, the stator resistance estimator can tolerate a relatively large error in ϕiλ caused by the non ideal parameters even at low speeds.
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