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Introduction for Introduction for

Injector Hydraulic Pump Power Saving SystemInjector Hydraulic Pump Power Saving System

Presented by Jing Hung Machinery & Electronic

Injector Hydraulic Pump Power Saving System

Proposal: The main power

consumption problem of plastic injection molding machine is the hydraulic system. To improve the efficiency of hydraulic system is the keypoint of injector power saving to achieve global environmental protection demand.


In the quantitative pump hydraulic system, constant speed motor to provide aconstant flow rate, the excess return of hydraulic fluid through the relief valve,this process is known as high-pressure throttling. According to statistics fromthe energy loss caused by high-pressure cutting up to 36% -68%. Therefore, toreduce the high-pressure throttling losses, improve power efficiency, powersaving hydraulic drive system has become the development direction.


High response AC synchronism servo electronics machinery drive (PMmotor) quantitative pump system to improve the defect of slow speedresponse that generic inveter to adjust RPM of hydraulic pump. In themeanwhile, electronic characteristic of PM motor has been enhanced tobe high efficiency, especially during low speed operation. Efficiency of PMmotor is higher than induction motor about 30~40%.


Linearity of electronic and machinery is changed by the RPM control flowdirectly is better than flow regulator as well as pressure ratio regulator. Errorand change rates are less than 0.5%. Hydraulic pressure is controlled by PIDoption card calculation. Pressure change rate is able to be closed to 1 bar.Electronic and machinery is in slow speed condition during pack phase andonly compensates to hydraulic pump to leakage inside without throttle loss.The flow lost could be reduced as maximization during pack and standbyphases. As for products which request long term of pack and cooling phases.Power saving rate is able to achieve 70%.


• Powerful functions: Independent PID calculation, short calculation time, fast reaction for pressure changing. Pressure response is able to be 60ms (micro second)

• Easy setting: All parameters are able to be

set by inverter unit.


Efficiency has been enhanced because ofPM motor electrical characteristics,especially at low speed and is higher thanInduction motors about 30 ~ 40%. PMMOTOR adopts a permanent magnet rotorstructure and low inertia of the rotor incooperation with the speed range andgood dynamic response characteristics ofacceleration and deceleration. RPM ischanged by the system of flow request, thereaction rate is able to achieve to 40ms orless.


• High drive dynamics – with fast switching valves and high-dynamic servo valves

• Energy-saving – through internal gear pumps with high efficiencies, low and high-pressure systems with automatic change-over and accumulator charging technology

• Application-optimized – of devices up to sub systems with highest functionality

• Proven in practice and reliability – in many areas of mechanical engineering


Combining fast response PM motor, Internalgear pump and Inverter to be hydraulicclosed loop control system can bring powerSaving characteristics and enhaced precisecontrol performance of hydraulic system.


System Structure Chart

Pressure command

0~10 Vdc

Flow command

0~10 Vdc

Speed feedback (resolved signal)

Pressure sensor feedback

0~10 Vdc


System Wiring Chart


The advantages of our hydraulic pump system

1. Power saving: According to the different products can save 30 to 70% of the power consumption, the cooling time, high-pressure with low-speed operation and pack time are longer can save power more obviously.

2. Environmental protection: Oil temperature will be very low. Oil usage can be reduced to margin against throttle way. Cooling water supply also can be cut down and extend the life of hydraulic oil life.

3. High precise: Speed response is very fast and linearity error rate is in 0.5%. Comparatively speaking, reproduction quality will be high as well as decrease defective rate.

4. After market service: All components of our hydraulic system are from the famous brands, they can offer complete after market service everywhere in the world.

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