Abstract
In this paper, a new vector control strategy is proposed to reduce torque ripples and harmonic currents represented in switching table-based direct torque control (ST-DTC) of a six-phase induction motor (6PIM). For this purpose, a new set of inputs is provided for the switching table (ST). These inputs are based on the decoupled current components in the synchronous reference frame. Indeed, using both field-oriented control (FOC) and direct torque control (DTC) concepts, precise inputs are applied to the ST in order to achieve better steady-state torque response. By applying the duty cycle control strategy, the loss subspace components are eliminated through a suitable selection of virtual voltage vectors. Each virtual voltage vector is based on a combination of a large and a medium vector to make the average volt-seconds in loss subspace near to zero. Therefore, the proposed strategy not only notably reduces the torque ripples, but also suppresses the low frequency current harmonics, simultaneously. Simulation and experimental results clarify the high performance of the proposed scheme.
Highlights
With the emergence of power electronic devices and adjustable-speed drives, multiphase machines have attracted wide attention for special applications in the naval, automotive, and aerospace industries [1,2]
The simulation results for the duty cycle and the proposed direct torque control (DTC) strategies under load change from 0 to about 3.5 Nm at t = 0.5 s, speed command of 100 rad/s, and flux command of 0.5 Wb are shown in Figures 7 and 8, a speed torque and stator flux reference signals are shown with red dashed lines
In this paper the performance of the 6PIM was improved by a new vector control strategy
Summary
With the emergence of power electronic devices and adjustable-speed drives, multiphase machines have attracted wide attention for special applications in the naval, automotive, and aerospace industries [1,2]. Direct Torque Control (DTC) is a simple and powerful scheme for variable speed 6PIM drives that provides high-performance torque and stator flux control [8]. Aiming to reduce harmonic currents, z − z (loss (VSI), of loss subspace seems possible through theelimination vector spaceofdecomposition subspace) components using the duty cycle concept in DTC is proposed in [9,12]. Harmonic using the duty cycle concept in DTC is proposed in [9,12] for a five-phase induction motor, and a currents have been reduced by adding an inductance filterharmonic to the 6PIM drivehave system.
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