In modern industrial hydraulic applications, especially in injection molding, die-casting, hydraulic presses and metal balers, system response speed and pressure stability directly determine production efficiency, product qualification rate and energy consumption. Shenzhen VEIKONG Electric, with more than 12 years of drive technology accumulation, has launched the VFD550I series electro-hydraulic servo drive, which achieves a 20ms ultra-fast pressure response through independently developed control algorithms and optimized structural design. This paper will interpret the pressure control principle of VFD550I in detail based on actual working conditions and technical parameters.
What Is 20ms Ultra-fast Response
The response time of a conventional hydraulic system is usually at the 100–300ms level, which leads to lag in pressure building, unstable flow and poor consistency of products. VEIKONG VFD550I shortens the pressure response time to 20ms, reaching millisecond-level closed-loop control. This means that after the system sends a pressure command, the drive can complete torque output, motor speed adjustment and oil pressure stabilization in an extremely short time, realizing “instruction arrives, pressure follows”.
This index is verified under actual working conditions: pressure overshoot ≤ ±1%, steady-state pressure fluctuation ≤ ±0.5Bar. It fundamentally solves the problems of slow response, pressure overshoot and unstable molding in traditional hydraulic systems.
Core Control Principle of VFD550I
Closed-loop Pressure Control Algorithm
The VFD550I adopts a high-precision closed-loop pressure control algorithm independently developed by VEIKONG. The algorithm collects real-time pressure signals from the oil pressure sensor, compares them with the target pressure set by the host computer, and quickly adjusts the output frequency and torque of the servo motor through high-speed calculation.
The whole closed-loop process includes:
· Real-time sampling of pressure signals
· High-speed error calculation and compensation
· Dynamic adjustment of motor speed and torque
· Fast suppression of pressure overshoot and oscillation
This set of algorithms ensures that the system pressure is always kept within the target range, even under variable load conditions.
High-speed Torque Output of PMSM
The VFD550I is matched with the MFD series AC permanent magnet synchronous servo motor, which has the characteristics of low inertia, high torque density and fast dynamic response. The motor can reach rated torque in a short time, providing strong power support for 20ms pressure response.
Compared with asynchronous motors, the MFD motor has 15% lower peak current and 20% higher power density, which greatly improves the response speed and control accuracy of the whole system.
Multi-pump Synchronization & CAN Bus Collaboration
For large hydraulic systems, VFD550I supports multi-pump confluence and diversion control based on CAN bus communication. The master-slave drives realize real-time data interaction, pressure command synchronization and flow coordinated distribution.
This structure ensures that multiple pumps can act synchronously or separately, further shortening the pressure building time and improving the overall response speed of the system.
Technical Parameters Supporting Ultra-fast Response
· Pressure response: 20ms
· Pressure overshoot: ≤ ±1%
· Steady-state pressure fluctuation: ≤ ±0.5Bar
· Overload capacity: 150% rated current for 60s; 180% for 10s
· Control modes: Sensorless vector (SVC), closed-loop vector (VC)
· Communication: MODBUS, CANopen
These parameters ensure that the VFD550I can maintain stable and fast response under long-term continuous operation and heavy load impact.
Application Benefits of 20ms Ultra-fast Response
Higher Production Efficiency
Millisecond-level response shortens the molding cycle, and the overall efficiency of injection molding and die-casting equipment is increased by more than 10%.
More Stable Product Quality
Pressure stability ensures consistent product size and density. Positioning accuracy can reach 0.1mm, significantly reducing the defective rate.
Better Energy-saving Effect
Fast and accurate pressure control reduces no-load flow loss and invalid energy consumption. The actual power saving rate can reach 20%–60%.
Conclusion
VEIKONG VFD550I electro-hydraulic servo system achieves 20ms ultra-fast pressure response through advanced closed-loop algorithm, high-performance permanent magnet synchronous motor and reliable bus communication technology. It perfectly meets the high-precision and high-efficiency needs of modern hydraulic equipment.
As a professional provider of electro-hydraulic servo solutions, VEIKONG will continue to invest in R&D and provide more stable, efficient and energy-saving products for global industrial customers.
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