Overmodulation and field weakening in direct torque control of induction motor drives
During transient conditions, for instance during acceleration and deceleration, the inverter used in an induction motor drive normally operates in overmodulation in order to efficiently utilize the DC-link voltage. Beyond the based-speed, the flux is normally reduced proportionally with speed to ext...
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| Format: | Thesis |
| Published: |
2006
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| Subjects: | |
| Online Access: | http://eprints.uthm.edu.my/823/ http://eprints.uthm.edu.my/823/1/24_Pages_from_OVERMODULATION_AND_FIELD_WEAKENING_IN_DIRECT_TORQUE_CONTROL_OF_INDUCTION_MOTOR_DRIVE.pdf |
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| Summary: | During transient conditions, for instance during acceleration and deceleration,
the inverter used in an induction motor drive normally operates in overmodulation in
order to efficiently utilize the DC-link voltage. Beyond the based-speed, the flux is
normally reduced proportionally with speed to extend the speed range of the drive
system. The capability of the induction motor drive under overmodulation and field
weakening modes are important, especially in electric vehicle applications, where the
available power is limited and the speed range needs to be increased to avoid use of
the mechanical gear. In order to fully utilize the dc link voltage, it is important to
understand the characteristics and performance of the drive system under these
conditions. The project will perform a simulation study on the performance of direct
torque control (DTC) induction motor drive under overmodulation and field
weakening conditions. In this project the study on overmodulation and field
weakening modes will be concentrated mainly on constant frequency torque
controller-based DTC drive. The potential of the constant frequency torque controller
in overmodulation and field weakening regions will be analyzed through simulation
using Matlab/Simulink package. The results obtained from the simulation is
evaluated. |
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