A Novel Method of Induction Motor Speed Control Using PLC
Journal Title: International Journal for Research in Applied Science and Engineering Technology (IJRASET) - Year 2015, Vol 3, Issue 2
Abstract
In any industry the induction motor plays an important role due to its low cost and simplicity. In the existing system motor speed is monitoring by HMI (Human Machine Interface). Due to this system, all parameters of motor are not monitored properly and continuous monitoring is done by man power in shift basis. The VFD consists of inverter with six power MOSFETs, PIC microcontroller and power supply. The speed of the motor is controlled by varying the frequency through Pulse Width Modulated (PWM) signals applied to the gate of the power MOSFETs. In VFD, the controls are programmed and implemented in PIC microcontroller to generate PWM gating pulses for the MOSFETs. PWM signals are pulse trains with fixed frequency and magnitude and variable pulse width. When a PWM signal is applied to the gate of power MOSFETs, it causes the output voltage of the VFD according to its turn on time. The inverter converts DC power to AC power at the required frequency and amplitude. By this the variable frequency is set by VFD and the motor speed can be changed to the required speed. The entire control system is switched by using PLC. Therefore, the main contribution of this paper is the monitoring, speed control of motor was done based on programmable logic controller, variable frequency drive and SCADA unit.
Authors and Affiliations
S. R. Venupriya, K. P. Thanusre, P. Saranya
Keywords
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