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With increasing performance of magnet material and decreasing cost permanent magnet synchronous machines (PMSM) become more and more important for practical use in naval applications. Excellent torque dynamics are important in these applications - they allow meeting additional demands due to electrical system stability. Dynamics are limited by the rating and the switching frequency of the converter...
In this paper two methods of torque control for induction motor have been investigated. First DTC method is implemented by using PI regulators and three-level inverter. Then an improved predictive torque control is developed and performed with two-level inverter. In the proposed predictive control the next torque and flux are predicted by discrete model of motor and inverter. Afterward the feasible...
Presently work exists within the IEEE to develop a test standard for Permanent Magnet AC (PMAC) machines that includes a specification on the quality of current supplied to the machine. The research presented in this paper offers a comparison on the quality of current provided to the machine for three control strategies; Space Vector, PI and Bang-Bang. The tests conducted were of an “on the fly” nature...
Interior permanent magnet machines are gaining more importance due to their advantages of cost optimized fabrication and the ability to use the reluctancy torque. A drawback of the interior permanent magnet machine is the more complex control structure than for synchronous machines having the magnets on the rotor surface. Therefore an optimized control structure has been developed and simulated to...
In this paper, an adaptive neural fuzzy inference system (ANFIS) is employed for the control of a PWM based direct torque control (DTC), driving a dual three-phase induction machine (DTPIM). DTPIM has two sets of three-phase windings spatially phase shifted by gamma (=60deg in this research) electrical degrees. The proposed control scheme uses a fuzzy inference system (FIS) to modulate the phase of...
The transient and steady state operations of a closed loop variable speed 6-pulse PWM inverter-fed permanent magnet synchronous motor [PMSM] drive system are simulated. Performance of the system covering important operational aspects while using a hysteresis controller or a modified predictive current controller were evaluated over a wide range of speed. Comparison of the results provide insight into...
Four-switch three-phase inverter (FSTPI) is usually adopted as the topology for continuous fault-tolerant operation of a direct torque (DTC) system when inverter fault occurs. Due to that the FSTPI can only provide four voltage space vectors with unequal amplitude, the DTC system performance will deteriorate to a certain extent. To enhance the performance of permanent magnet synchronous motor (PMSM)...
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