Induction Motor Research Paper
A SPEED CONTROL OF INDUCTION MOTOR DRIVE SYSTEM USING FUZZY SLIDING MODE CONTROLLER
M.V.Anusha P. Ranjith Krishna T.Ravikumar
1 M.TECH student, department of electrical engineering, Geethanjali institute of science and technology, Andhra Pradesh, India.
2Assistant Professor, department of electrical engineering, Geethanjali institute of science and technology, Andhra Pradesh, India.
3Associate Professor, department of electrical engineering, Geethanjali institute of science and technology, Andhra Pradesh, India
Abstract- Basically the motor drive system comprises a voltage source inverter –fed inductor motor (VSIM): namely a three – phase voltage source inverter and the induction motor. The squirrel-cage induction motor voltage equations
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With respect to phasor diagram of Indirect Vector Control method of induction motor, this is shown in Fig.1.1.
Fig. 1.1: Phasor diagram of indirect vector control method of Induction motor
The slip speed signal added with feedback rotor speed signal to generate frequency signal. The slip speed together with the rotor speed is integrated to obtain the stator reference space vector positionθ_e. θ_e=∫▒ω_e dt=∫▒〖(ω_r 〗+ω_sl)=θ_r+θ_sl (3)
The vector rotate converts the two phase d-q axis reference. Currents iqs and ids to three phase currents ia*ib*ic*. The reference currents are compared with the actual currents ia,ib,ic from induction motor .the currents errors are fed to the hysteresis current controller. The hysteresis current controller allows the induction motor currents to vary with in a hysteresis band that the required performance of the machine is obtained.
Where wr is the rotor speed j is the moment of inertia, b is the damping coefficient and tl is the external load disturbance te denotes electromagnetic torque. The electromagnetic torque is given by (4)
Where kt is the torque constant is defined as
2
Kt = (3np/2) (Lm/Lr) i*ds
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JNTU and Master’s Degree from JNTU College of engineering, Ananthapur. Currently, pursuing PhD in KL University and working as an associate professor in Geethanjali institute of science and technology, Nellore, JNTU Ananthapur, A.P. he is having 7years 6 months of teaching experience. His areas in power systems and power electronics & drives. His research interests include electric machines, machine drives, power electronics/conversion, and practical use and improvement of modern control and power electronics
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