An Investigation on Speed Control of a Spindle Cluster Driven by Hydraulic Motor: Application to Metal Cutting Machines

Figure 3

Picture of experimental system (1: pressure gauge; 2: overflow valve and safety valve (maximum pressure 31.10⁶N/m², maxiumum flow rate 56.7l/min, Taiwan); 3: hydraulic power with three-phase motor (2.2 kW, 1420 rpm) operating with the V-belt (transmission ratio is 1:1) to supply oil for gears (volume is 1210⁻⁶m³/rev; maximum pressure is 2010⁶N/m²); flow rate supplying for the system is 17.04l/min; 4: amplification (Festo Didactic); 5: load generation system; 6: working shaft; 7: tachometer (Pittman USA, no F8412G591, 2V/Krpm); 8: high-pressure filter. Using to filter debris of oil (Parker, USA); 9: Hydraulic motor (1210⁻⁶m³/rad, Rockford illinois, Model 16-Z-3); 10: hydraulic accumulator (3410⁶N/m², volume 0.95l); 11: proportional valve (Q = 0÷2.3310⁻⁴m³/s, = 15.9810⁶N/m², = 100 mA, input voltage 0÷24 VDC, linear error < 4%, Festo Didactic Proportional valve 4/3); 12: Arduino (MEGA 2560); digital-to-analog converter (DAC 4921)).