In fact it was often a necessary evil. With the advent of the VFD you may be able to achieve relatively constant flows and reduce the energy required.
However, the flux estimation is usually based on the integration of the motor phase voltages. Due to the inevitable errors in the voltage measurement and stator resistance estimate the integrals tend to become erroneous at low speed. Thus it is not possible to control the motor if the output frequency of the variable frequency drive is zero.
However, by careful design of the control system it is possible to have the minimum frequency in the range 0. A reversal of the rotation direction is possible too if the speed is passing through the zero range rapidly enough to prevent excessive flux estimate deviation.
If continuous operation at low speeds including zero frequency operation is required, a speed or position sensor can be added to the DTC system. With the sensor, high accuracy of the torque and speed control can be maintained in the whole speed range. The only difference between DTC and DSC is the shape of the path along which the flux vector is controlled, the former path being quasi-circular whereas the latter is hexagonal such that the switching frequency of DTC is higher than DSC.
DTC is accordingly aimed at low-to-mid power drives whereas DSC is usually used for higher power drives. Since its mids introduction applications, DTC have been used to advantage because of its simplicity and very fast torque and flux control response for high performance induction motor IM drive applications.
DTC was also studied in Baader's thesis, which provides a very good treatment of the subject. DTC has also been applied to three-phase grid side converter control. Further, the waveform of the phase currents is very sinusoidal and power factor can be adjusted as desired.
In the grid side converter DTC version the grid is considered to be a big electric machine. Advances in Electrical and Electronic Engineering. Retrieved 13 November The University of New South Wales. Retrieved 14 November Retrieved 15 November Archived from the original on January 7, Retrieved 7 January Archived from the original PDF on October 18, Retrieved 18 October 72 Nahid Ahmadinia: The Linear Induction Motor (LIM) & Single Linear Induction Motor (SLIM) 2.
History The history of linear electric motors can be traced back at. A Thesis presented to the faculty of the Graduate School University of Missouri-Columbia In Partial Fulfillment Of the Requirements for the Degree Master of Science by SARVESWARA PRASAD BHAMIDI Dr.
Robert M O’Connell, Thesis Supervisor DESIGN OF A . In this thesis, the analysis of the dynamic response of a Linear Induction Motor as an electromechanical system is done, accounting for all the governing equations implied in the process which are used to develop the corresponding simulation models.
Small Linear Induction Motor Design and Construction Helsinki Metropolia University of Applied Sciences Bachelors of Engineering Degree Programme in Electronics Bachelor’s Thesis January Abstract Author(s) Title Number of Pages Date Anwar Ulhaq Small .
Master Thesis Report IST, October Nuno Grilo 1 Design and characterization of an induction motor for application in a commercial electric vehicle.
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