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Double-Inverter Fed Independent Direct Torque Control of Slip-Ring Induction Machine
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DOI：10.1109/JESTIE.2025.3650168.png)
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Abstract
En 中文
In this article, both the stator and rotor sides of the slip-ring induction motor (SRIM) are controlled using two distinct direct torque control (DTC) strategies, resulting in a dual DTC (DDTC) architecture. The SRIM is treated as a combination of two independent virtual induction machines (IMs), where each IM is operated individually through the stator and rotor terminals, respectively. In this article, a current model-based approach is employed to estimate the stator and rotor fluxes, which eliminates the need for conventional integration-based flux estimation and enabling more efficient digital implementation. Moreover, a flux sharing strategy based on the minimization of total copper losses is proposed to enhance the flux control performance. Further, field-weakening-based control is investigated under the DDTC scheme, wherein the motor is operated up to 2.2 per unit (p.u.) speed, with a base speed of 2 p.u., in a doubly fed configuration. A flux-sharing mechanism based on airgap and leakage fluxes is considered to determine the appropriate magnitudes of the stator and rotor fluxes. The proposed DDTC approach is experimentally validated using a 2.2 kW SRIM test setup.
Keywords:
Stators
Rotors
Mathematical models
Torque
Torque control
Air gaps
Magnetic flux
Electromagnetics
Transient response
Inductance
Dual direct torque control (DDTC)
field-weakening (FW)
flux-sharing
slip-ring induction motor (SRIM)
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