Sizing of a Right BLDC Motor for CNC Feed Drive
P.Ram Kishore Kumar Reddy1, P. Nagasekhara Reddy2, M. Ramachandra Rao3

1P.Ram Kishore Kumar Reddy, Associate Professor, Department of Electrical and Electronics Engineering, MGIT, Hyderabad (Telangana), India.
2P.Nagasekhara Reddy, Sr. Assistant Professor, Department of Electrical and Electronics Engineering, MGIT, Hyderabad (Telangana), India.
3M.Ramchandra Rao, Professor, Department of Electrical and Electronics Engineering, KL University, Guntur (Andhra Pradesh), India.
Manuscript received on 10 May 2013 | Revised Manuscript received on 18 May 2013 | Manuscript Published on 30 May 2013 | PP: 60-64 | Volume-2 Issue-6, May 2013 | Retrieval Number: F0782052613/13©BEIESP
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Abstract: This paper provides a technical aspects and design factors for selection of a right Brushless Direct Current (BLDC) motor for a CNC feed drive.To meet the most demanding requirements of CNC machine tools, robots and transfer lines in terms of productivity, accuracy and dynamic performance, brushless DC drives are very widely used. These drives employ brushless torque motors which are of high torque, low speed direct drive type. The performance and reliability of BLDC motor drivers have been improved because the conventional control and sensing techniques have been improved through sensorless technology. This paper presents a procedure for selecting and sizing a right torque motor for a CNC feed drive when the relevant application data is available. The duty cycle characteristics of the motor are presented to study certain parameters from thermal considerations. Expressions for acceleration torque and acceleration time are developed to study their effect on the high dynamic performance. In this paper the procedure is illustrated in the selection of Z-axis feed motor for CNC lathe with an example.
Keywords: Brushless DC Motors, Sizing, PWM, CNC Drive, Acceleration/Deceleration Curve, Speed And Torque.

Scope of the Article: Networked-Driven Multicourse Chips