Sytronix DFEn Solution with Angle Sensor

Abstract Previously on iHydrostatics N7/N8: New power control solution – Danfoss S45 ETL (Electronic Torque Limiting) has been shared detailedly. By discussing ETL hydraulic circuit, control principle and difference comparison, hope you can get a whole picture of this new solution. Simply reply N7 or N8 in Wechat iHydrostatics to get the history posts if you missed them. Any questions, comments or suggestions are warmly welcomed, iHydrostatics strongly encourages you to leave your comments in iHydrostatics QQ Group: 426372753.

In this new post, iHydrostatics will still talk about product with angle sensor but focusing on Rexroth SYDFEn. What SYDFEn is, How it works, Typical application and Demonstration will be shared. Follow me to start this fantastic adventure.

1 SYDFEn BasicsConcept

SYDFEn is one of Sytronix (Smart Interplay of Hydraulics and Electronics) systems presented by Rexroth. FcP (Frequency-controlled Pump drive) and SvP (Servo-variable Pump drive) are the other two parts of Sytronix system shown below.

SYDFEn, this Sytronix drive, combines matched electric motors, hydraulic pumps, and VFDs (Variable Frequency Drives), which has the potential of significant energy savings and a considerable reduction in noise emissions at a cost that provides an attractive return on investment.

By integrating the advantages of hydraulics with the control intelligence of electrical drives, motor speeds can be continually adjusted to match the machine’s requirements. The drive speed of the pump can be lowered to an energy efficient, quiet level when the process requires less than full performance. By having a major portion of the machine cycle time matched to the part-load requirement, energy is saved and noise is reduced.

Control Principle

SYDFEn system consists of an electro-hydraulically-controlled axial piston pump driven by a variable speed asynchronous motor for controlling pressure, flow and power without throttling losses in the power train.
Axial piston variable pump with integrated control electronics
MOT-FC standard asynchronous motor
VFD to control motor speed
Pressure transducer

The system can be operated in two function modes: In “Teach-in” mode, the cyclically recurring pressure and flow rate profiles are stored once in the electronics, so that the system is accelerated in good time prior to a flow rate increase. On the other hand, “Real-time mode” can be used in non-cyclical machines (e.g. wood working/metallurgy). In this case the controller calculates during the process the optimal combination of the rotational speed of the motor and the swivel angle position for maximum energy saving.

Sensors detect the current system pressure as well as the current engine speed and transfer these values to the pump-integrated digital on-board control electronics. After matching the current actual values with the target values transmitted by the control, the integrated control calculates the optimal speed for the entire drive strain.
The system operates an axial piston pump and its delivery volume can be adjusted through the pivot angle. The specialty of the SYDFEn system is that the hydraulic volume flow rate can be adjusted by adjusting the pivot angle, as well as by changing the rotational speed of the electric engine. Compared to the other Sytronix Variable Speed Pump Drives, the SYDFEn system’s additional degree of freedom ensures a significant reduction of the strain on the electric engine under the same hydraulic conditions. The control system is available for pumps of the series A10 and A4, and can therefore be used for a wide range of applications.

Configuration

The SYDFEn closed-loop control system, with nominal pump volumes ranging from 18 to 355 cc, permits a uniform closed-loop control concept for a wide range of machine sizes. The electronic variants available allow it to be used in many different types of machines.

SYDFEC-2X

Standard Series (A10VSO series 31)
Nominal pressure of 280 bar
Nominal size of 18 to 140 cc
Flow rate of 27 to 210 l/min
Operating temperature range of 0°C to 50°C
CAN open interface
Adjustable with preload valve starting at 1 bar (optional)

SYDFEC-3X

Optimized Series (A10VSO series 32)
Nominal pressure of 280 bar
Nominal size of 71 to 180 cc
Flow rate of 106 to 270 l/min
Operating temperature range of 0°C to 50°C
CAN open interface
More flexibility with the U99 universal through-drive
Adjustable with preload valve starting at 1 bar (optional)
Noise reduction due to PCV pressure pulsation compensation (optional)

SY(H)DFEC-1X

High-Pressure Series
Nominal pressure of 350 bar
Nominal size of 71 to 355 cc
Flow rate of 186 to 533 l/min
Ambient temperature of 0°C to 50°C
More flexibility with the U99 universal through-drive
CAN open interface
Suitable for HFC hydraulic fluid (optional)

2SYDFEn ApplicationAs one important part of Sytronix system solution, SYDFEn system can be applied in various occasions, especially in industry field. The following picture shows the typical applications with this kind of system.

Here is also a video to introduce how Sytronix system works in a straightening machine.

3SYDFEn Demonstration
More is always the typical characteristics of iHydrostatics. If the information shared above still cannot satisfy your appetite, no problem, check the following video to get more you want. In this video, CMAFH Engineering Manager Norm Dziedzic will demonstrate how SYDFEn system works in the real world.