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In this paper, an improved DTC scheme for five phase inverter fed induction motor is presented. The work present here aims to the development of conventional DTC to reduce the torque ripple. For this, a multi-band torque hysteresis controller is implemented as a modification in a conventional DTC mathematical model of 5 phase induction machine based on reference frame theory is also discussed in detail...
The direct torque control of induction motor has good dynamic performance of torque and flux. However, the switching frequency (in the case of conventional DTC) is variable and difficult to control due to the use of hysteresis controllers. This lack of control over frequency is the origin of torque and flux ripples. Similarly, the use of a voltage inverter with two levels limits the power of the drive...
This paper presents a simple overmodulation method employed in direct torque control (DTC) constant switching frequency (CSF) controller of induction machines. The proposed overmodulation method is utilized to extend a constant torque region and hence produce high torque capability in field-weakening region with six-step operation. It will be shown that the overmodulation operation using the DTC-CSF...
This paper presents a simple dynamic overmodulation method to obtain a fast dynamic torque response in DTC of induction machines with constant switching frequency controller. A fast dynamic torque response can be obtained by switching only the most optimized voltage vector during torque dynamic condition. The optimized voltage vector can be identified by comparing the rate of change of torque produced...
This paper presents a simple overmodulation strategy in DTC-hysterisis based structure of induction machine drives. It will be shown that by controlling the shape of stator flux locus, the switching pattern of stator phase voltage can be controlled such that a smooth transition from PWM to six-step is achieved. The locus of the stator flux space vector is controlled by the holding angle which is estimated...
This paper presents a simple overmodulation method employed in direct torque control (DTC) hysteresis-based structure. The overmodulation method is utilized to obtain higher torque capability for a wider range of speed operation. The proposed overmodulation strategy is based on the control of stator flux vector. It is shown that the switching pattern of the voltage vector in the overmodulation mode...
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