Product description:

The electro-hydraulic servo system combines both electrical and hydraulic advantages, with high control precision, fast response, large output power, flexible signal processing, and easy implementation of various parameters and feedback. The electro-hydraulic servo system consists of four parts: driver, motor, oil pump and signal feedback. The driver receives and processes various commands and feedback signals to drive the motor. The motor drives the oil pump to execute. The feedback component collects the real-time system operating state feedback to the driver as a reference.

In the electro-hydraulic servo system, the permanent magnet synchronous motor is coaxially connected with the oil pump. The drive motor drives the oil pump to supply oil, and then the pressure sensor feeds back the actual pressure signal to the driver. The drive performs precise pressure closed loop according to the pressure feedback signal and the motor encoder. Control, the output flow size is obtained by the increase and decrease of the speed. The hydraulic pressure control returns the pressure signal to the drive through the pressure sensor for continuous closed-loop control. There is no overflow pressure relief valve in the entire servo system, there is no excess oil passing through the circuit back to the fuel tank, there is no waste of power consumption. The output power consumption can be greatly reduced. The control oil pump output displacement and pressure actively, quickly and accurately follow the given signal change of the upper computer to adapt to the pressure, speed and time requirements of the injection molding process.

1. System Introduction

l the driver

The drive adopts a unique motor control algorithm for electro-hydraulic servo characteristics, which realizes rapid and stable control of pressure and flow, and has the characteristics of large margin design, high temperature operation, convenient installation and debugging. Among them, our company has developed a liquid-cooled series driver for the harsh working environment, which has the advantages of high temperature resistance, corrosion resistance and environmental impact.

l the motor

The permanent magnet servo motor adopts the latest generation of rare earth permanent magnet material, which has small volume, low inertia, high performance, high efficiency, low noise, fast response, stable operation, high control precision, strong overload capability, and obvious power saving effect in continuous load. Features.

l oil pump

Electro-hydraulic servos can be used with gear pumps, plunger pumps and screw pumps due to different environments and requirements.

Gear pump: strong anti-pollution ability, long service life, good self-priming, simple structure and convenient maintenance.

Piston pump: high precision, good sealing and high working pressure.

Screw pump: low noise, high speed and small pulsation.

l pressure sensor

The pressure sensor can be divided into current type (4-20m A) and voltage type (0-10V DC). When selecting, please refer to the sensitivity, offset, linearity, hysteresis and other parameters of the product, which are directly affected by the feedback signal. The performance of the system, try to use high-precision, high-sensitivity, linearity of the brand.

2. Performance characteristics

l High-performance dedicated servo control: vector control + weak magnetic control + PID control.

l Starting torque: 0Hz 180%; steady speed accuracy: ± 0.02%; torque control accuracy: ± 2%.

l Strong overload capability: 150% rated current 60s, 180% rated current 5s.

l Using 32-bit high-speed DSP, excellent performance.

l Pressure and flow double closed loop control, according to the pressure and flow required by the system, to achieve precise and rapid control.

l Response time: 20 m s, pressure fluctuation range: ± 0.3 bar.

l Support 0-10 V DC / 4-20 m A analog signal direct access.

l Support 0-1000m A analog signal access (with our dedicated current to voltage conversion board).

l Built-in CAN communication, 485 communication function, can easily achieve multi-pump confluence.

l With a variety of protection methods such as phase loss, short circuit, and overheat detection.

3. Application occasions

l Injection molding machine

l die casting machine

l brick press

l shoe machine

l press

l aluminum extrusion machine

l hydraulic, CNC punching machine

l Civil engineering testing machinery

l other hydraulic machinery