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Heat loss optimisation in CNC motors

Mahdavinejad R.

Archives of Materials Science and Engineering

2009

Vol. 35, nr 1

47-53

Purpose: Heat loss plays very important role in CNC systems, especially in suspension systems with permanent load that are usually used for testing, detection and automatic cutting, the adjusting of motor torque in each axis is based on starting by maximum current required to overcome against resistant torque on the motion surface of the system. Design/methodology/approach: In this research a new control method is introduced for the minimization of heat loss in CNC motors. In these systems the misdirected current that causes magnetic misalignment and reduces the torque is converted to heat in the motor winding, thus reducing the motor continuous torque capability. Findings: This method is based on an open-architecture of a dynamic control to optimize the input current in order to dissipate the minimal heat loss. So that, it reaches the requested velocity-position condition with the lowest amount of misaligned magnetic field and current converted to heat. Research limitations/implications: The dynamic performance implications are more important than the steady-state torque disadvantage. Practical implications: An algorithm for the dynamic torque control is given and a simulation is carried out using this algorithm for a two axis CNC cutting system with two-guider bars suspension. Reaching to the actual requested motor current is practical implication. From this point of view, the enhanced free running of pulse width modulated (PWM) is represented. Originality/value: Results obtained in this work show that using the proposed procedure the heat loss is minimized while the speed errors are reduced and the surface finish is improved. Finally, the results of this dynamic control method is represented on CNC two axes cutting machine and extended the results on the other systems.