1 Introducing Energy-saving Hydraulic Units March 2006 Fujikoshi Corporation For publication

2 Features 40% Energy-savings Compact and Lightweight Quite, Low-surge Cool Operation Block Installation Possible Easy Maintenance Compact Variable Volume Pump Unit NSP Series 40% Energy Savings Compared to Existing Model Perfect for Machine and Cutting Tools 8 cm 3 /rev 10 liter tank 26 cm 3 /rev 30/40 liter tank

3 NSP Unit Series

4 ６６０㎜ ３２０㎜ NSP-30-37V2A3-12 (NSP Unit 30-L tank) NSP-30-37V2A3-12 (NSP Unit 30-L tank) NCP VD1A3-20 (Existing Unit 60-L tank) NCP VD1A3-20 (Existing Unit 60-L tank) Energy Savings and Cool Operation mean the NSP Unit's tank capacity is less than 1/2 the hydraulic fluid capacity. (Comparable specifications) Energy Savings and Cool Operation mean the NSP Unit's tank capacity is less than 1/2 the hydraulic fluid capacity. (Comparable specifications)

5 Pump: Increased mechanical efficiency Pump: Increased volumetric efficiency Electric drive: copper loss, iron loss reduction effectiveness ratio characteristics modification Energy Saving Configuration Plate-S oil groove Vane pushing force reduction Side clearance External drain reduction Plate-H Pressure factor adjustment Internal leakage, external drain reduction Plate-S oil groove External drain reduction Increased efficiency of electric drive

6 (1) Reduced pressure losses : Energy saving product : Conventional product Pushing force (Not in low-energy model) (2) Lowered sleeve resistance (1) Changed hydraulic fluid routing in vane back pressure chamber (2) Modified plate pushing force (3) Eliminated plate impulse channel No internal leaks from gasket Energy savings: Increased pumping efficiency Plate S hydraulic fluid channel through-flow  Stopped Lowered internal resistance, reduced drain volume. (3) Stopped internal leaks

7 Energy savings: Increased pumping efficiency "Internal leaks" cause losses. However, they are necessary to lubricate the pump. Too muchLosses (overheating, electrical power consumption) Too littleBurn out (sleeve resistance) "Internal leaks" cause losses. However, they are necessary to lubricate the pump. Too muchLosses (overheating, electrical power consumption) Too littleBurn out (sleeve resistance) About the drain... Conventional unit's pump generated 2 l/min NSP unit's pump generates 0.5 l/min Pump pressure Drain volume Hydraulic pressure symbol (pump) Dwelling 1/4 drain volume

8 Teeth Slot shape Open  Closed Accumulated thickness Teeth Core back Hoop width Electric drive-polarity: 2.2 kW-4P Voltage-cycles: AC 200 V, 60 Hz When pump is fully cut off (dwelling time load ratio) Conventional model Electric drive load ratio (%) Electric drive efficiency Energy saving model (%) Stator Energy savings: Increased electric drive efficiency 1) Accumulated thickness reduced and iron loss suppressed. (Rotor) 2) Hoop width changed to stabilize magnetic field. (Stator) 10% Increased efficiency 10% Increased efficiency Rotor Energy savings

9 Conditions (dwelling) Electric drive-polarity 2.2 kW-4P Voltage-cycles: AC 200 V, 60 Hz Voltage 6.0 Mpa Energy savings: Increased electric drive efficiency Dwelling pressure - power consumption characteristics 40% down Conventional hydraulic unit NCP-60 NSP Unit NSP-20 Reduced dwell time power consumption 40%. Dwell pressure (MPa) Power consumption (kW)

10 Nachi Machine Evaluation (Machining Center)

11 Approximately 20% energy savings during discharge Approximatel y 5% energy savings during dwell Energy savings during cyclic operation: 12% (1) Power consumption comparison * Hydraulic fluid used: ISO VG32 * Hydraulic fluid temperature: 40 to 50˚C * Electricity: 2.2 kW * Voltage - frequency: AC 200 V - 60 Hz * Operating cycles: 2 seconds  8 seconds * Discharge settings: 28 L/min, 2.0 MPa (NSP Unit: 16 cm 3 /rev) * Dwell settings: 0 L/min, 6.0 MPa [Operating conditions] Compared with inverter unit produced by other company 1 NSP Unit Saves More Energy

12 Power consumption: W 1896 W 1490 W Power consumption compared with inverter unit produced by other company 615 W 550 W Dischargin g Dwelling NSP Unit INV Unit

13 [Operating conditions] * Hydraulic fluid used: ISO VG 32 * Hydraulic fluid temperature: 45  C * Voltage-cycles: AC 200 V, 60 Hz (2) P-Q characteristics comparison :NSP Unit Flow Capacity  :NSP Unit Drain Capacity :INV Unit Flow Capacity  :INV Unit Drain Capacity Compared with inverter unit produced by other company 2 INV Unit RPMs are stable, but drain flow is small NSP Unit RPMs are reduced as energy is saved because drain flow is minimal. RPMs being reduced, but drain flow is large Flow (l/min) Pressure (MPa) Drain flow (l/min)

14 (3) Pressure pulse [Operating conditions] INV Unit 3.0 MPa, when dischargingINV Unit 6.0 MPa, when dwelling NSP Unit 6.0 MPa, when dwelling NSP Unit 3.0 MPa, when discharging 0.41 MPa 0.30 MPa 0.44 MPa 1.07 MPa Compared with inverter unit produced by other company 3 Pulse width is small Propagation of pulse to machine is reduced * Hydraulic fluid: ISO VG32*Hydraulic fluid temperature: 40 to 50˚ * Pump capacity: 16 cm 3 /rev *Electric drive: 2.2 kW*Voltage - frequency: AC 200 V, 60 Hz

15 [Operating conditions] * Hydraulic fluid used: ISO VG 32 * Hydraulic fluid temperature: 40 to 50  C * Voltage-cycles: AC 200 V, 60 Hz Flow recovery time: Effects machine cycle Compared with inverter unit produced by other company 4 (4) Response characteristics Time Pressure Dwelling Discharging Clamp and chuck t2 t1 The NSP unit has a quick response time for flow recovery so machines can operate at a high cycle.

16 Compared with inverter unit produced by other company 5 (5) Rising hydraulic fluid temperature (Over 4 hours dwelling continuously) It is possible to increase cutting precision because the NSP Unit's hydraulic fluid temperature increase is low so heat is not transmitted to the machinery. [Operating conditions] * Hydraulic fluid used: ISO VG 32 * Pump capacity: 16cm3/rev * Electric drive: 2.2 kW * Voltage-cycles: AC 200 V, 60 Hz * Room temperature: 26  C NSP Unit INV Unit Room temperature Operating time (Hrs) Bearing Temperature （℃）

17 Compared with inverter unit produced by other company 6 (6) Power consumption comparison (estimated cost for standard cycle) Effect of energy savings for one year (Nachi comparison) \32,400 Effect of energy savings for one year (INV Unit comparison) \16,500

18 Reference material Effect of reduction in power consumption and CO2

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