Precision Motion Control with Variable Speed AC Drives using PLC
Kiran Kumar GR1, Shivakumar LN2, Marulasiddappa HB3
1Mr.Kiran Kumar GR., Department of Electrical and Electronics Engineering, VTU/ PESITM, Shimoga (Karnataka), India.
2Mr. Shivakumar LN., Department of Electrical and Electronics Engineering, VTU/ PESITM, Shimoga (Karnataka), India.
3Mr. Marulasiddappa HB., Department of Electrical and Electronics Engineering, VTU/ PESITM, Shimoga (Karnataka), India.
Manuscript received on 20 January 2014 | Revised Manuscript received on 25 January 2014 | Manuscript published on 30 January 2014 | PP: 43-47 | Volume-2 Issue-6, January 2014 | Retrieval Number: F0915012614/2014©BEIESP
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Abstract: A new scheme for precision motion control of AC motor driving a load is proposed. Traditionally, DC motors had been preferred in applications requiring control of speed and position at close tolerance. The high torque bandwidth over the complete speed range available with a separately excited DC machine was ideal for such applications. However, the cost of manufacturing and maintaining a DC motor and the associated control gear is high. The recent developments of technology to control speed of AC motors with almost constant torque over the entire speed range from zero-speed to rated speed, has made the option of using AC drives in place of DC motor drives cheaper and virtually maintenance free. The DC motor, for precise control of speed, typically uses analog or digital tacho-generator for speed feedback. In the proposed scheme, the drive system based on PWM AC drive, direct speed feedback has been eliminated adopting “Open-Loop Vector Control”. This is achieved by a combination of a programmable logic controller (PLC) and variable speed AC drive systems along with encoders.
Keywords: Programmable Logic Controller (PLC), AC Drive, Encoders, Ethernet. 20-COMM-E, DPI, TCP/ IP. Proximity sensors. HMI,SCADA
Scope of the Article: Computer Network