Abstract
High torque ripple is the main draw of Switched Reluctance Motor (SRM) compared to other conventional motor. Torque ripples can be minimized by Direct Instantaneous Torque Control (DITC) technique. DITC responds against the torque error instantaneously by using hysteresis torque controller and regulate the torque output of the motor within hysteresis band.This paper compares the performance of Switched Reluctance Motor in terms of torque ripples with DITC strategy for both Asymmetric converter and Four-level converter. Asymmetric converter has three states namely magnetization, freewheeling and demagnetiztion states. With four-level converter, fast magnetization and fast demagnetization are also possible. Thus, the current build up and decay time is reduced which improves the dynamic performance. SRM is simulated using DITC scheme with Asymmetric converter and Four-level converter in MATLAB/SIMULINK to analyze torque ripples and it is observed that DITC with four level converter is better than that with Assymetrical converter.
Highlights
Switched Reluctance Motor is considered as an alternate to conventional motor because of its advantages such as simple structure, high torque to inertia ratio, adapibility to hostile environment and high reliability
Torque ripple is high in Switched Reluctance Motor (SRM) because of double saliency and highly nonlinear magnetic characteristics
This paper has analysed the variation of torque ripples in SRM with Direct Instantaneous Torque Control (DITC) technique for two converters namely Asymmetric converter and Four-level converter
Summary
Switched Reluctance Motor is considered as an alternate to conventional motor because of its advantages such as simple structure, high torque to inertia ratio, adapibility to hostile environment and high reliability. The positive source voltage is applied to the phase, and current flows into the phase windings such that flux increases This mode is known as magnetization mode and is represented by state 1. When switches Q1 is open and Q2 remains closed, as, the phase is isolated from the source, diode D1 is forward biased, and the phase winding current circulates, or freewheels, inside the loop of diode D1 and switch Q2 This is the zero-voltage loop, and flux decays very slowly due to the conduction losses within the elements in that loop. When switches Q1 and Q2 are both open, as, both diodes D1 and D2 are forward biased, but the source voltage terminal polarity is switched across the phase winding, such that negative source voltage is applied to the phase This serves to drive current, and flux, in the phase to zero quickly. This mode is known as demagnetization mode and is represented by state -1
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