Speed Control of Induction Motor using Scalar Control Technique

 ABSTRACT

This paper presents design and implementation of scalar control of induction motor. This method leads to be able to adjust the speed of the motor by control the frequency and amplitude of the stator voltage of induction motor, the ratio of stator voltage to frequency should be kept constant, which is called as V/F or scalar control of induction motor drive.

Induction Motor

This paper presents a comparative study of open loop and clos loop V/F control induction motor. The V/F control is based on advent of stator voltage derivatives. Simulation is carried out in MATLAB/SIMULINK environment and results are compared for speed control of induction motor.

Keywords
Scalar control (V/F), Induction Motor (IM), Open loop V/F control, closed loop V/F control, PI controller.

Block Diagram:

Fig-1: Block diagram of the open loop V/F control for an IM.

Expected Simulation Results:

Fig-2 Current vs. Time

Fig-3 Torque vs. Time

Fig-4 Current vs. Time

Fig-5 Torque vs. Time

CONCLUSION

Simulation is carried out in MATLAB environment for speed control of induction motor for full load, using PI controller. And the results are checked. From the above experiment and results we concluded that the closed loop V/F control gives better response and better result as compared to open loop V/F control of induction motor.

REFERENCES

[1] B.K. Bose, Power Electronics and AC Drives, Prentice- Hall,’’ NJ,USA, 2002.

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[3] A. Munoz-Garcia, T.A. Lipo, D.W. Novotny, ‘‘A new induction motor V/f control method capable of highperformance regulation at low speeds, ’’ Vol. 34, No. 4, July/August 1998, pp. 813 - 821.

[4] H. Akroum, M. Kidouche, A. Aibeche, ‘‘A dSPACE DSP Control Platform for V/F Controlled Induction Motor Drive and Parameters Identification,’’ Lecture Notes in Electrical Engineering (LNEE), vol. 121, pp. 305-312, 2011.

[5] A. Oteafy, J. Chiasson, ‘‘A Study of the Lyapunov Stability of an Open- Loop Induction Machine IEEE Transactions on Control Systems Technology,’’ Vol. 18 , No. 6, Nov. 2010, pp. 1469 – 1476