How to Choose the Right Synchronous Motor for * or Hydraulic Cylinder

If several hydraulic motors or cylinders are driven by a single pressure oil supply without any means to control their respective flow rates, the motor or cylinder with the lowest pressure requirement will initiate movement first, until it reaches the end of its stroke or encounters a greater load, at which point the next motor or cylinder with a lower pressure requirement will start. In other words, all hydraulic motors or cylinders will operate in sequence until all movements are completed. This mode of operation is undesirable. In reality, we often encounter situations where different loads are involved, and we commonly employ the following methods to control flow rates and achieve synchronized motion:

♦ Flow control valves are installed in the circuit of each hydraulic motor or cylinder.

♦ Proportional Valve Feedback Control

♦ Employed分流集流阀；

♦ Gear-driven synchronizing分流器

♦ Piston-type synchronous分流 valves;

Synchronization Error

The synchronous performance of gear synchronizing diverters primarily depends on the following parameters:

♦ Load Balancing

Medium's temperature and viscosity

System Pressure Grades

♦ Gearbox speed

♦ Continuity of traffic

If all the detailed parameters are known, the synchronous error can be precisely calculated. Additionally, the machining errors existing between similar specification dividers must also be considered.

To achieve high synchronization performance, it is recommended that the following requirements be met during design:

♦ The speed of the分流器 during low flow must not be less than 1000 rpm

♦ All lifting cylinders are loaded as evenly as possible

♦ Under constant temperature and working pressure conditions ranging from 100bar to 210bar, ensure the medium viscosity remains around 40cSt.

During the preliminary design phase, reference was made to the following synchronization accuracy:

±1.5% to ±2.5% applicable for cast iron gear synchronizing diverter

±2.5% to ±3.5% for Aluminum Alloy Gear Synchronous Diverters

Internal pressure reduction

For gear diverters, the pressure loss Δp at import and export is approximately 10-12bar. However, in actual use, affected by pressure, flow rate, and medium viscosity, the pressure loss may exceed the above reference value.

Traffic

For our gear dividers, the minimum flow rate per blade can be calculated at 400 rpm. However, to achieve high synchronization accuracy, we recommend designing at a minimum speed of 1000 rpm. Also, refer to the flow rate range per blade listed in the "Technical Parameters."

Speed Range

For cast iron distributors, the recommended speed range is: 700rpm to 2300rpm.

For aluminum alloy shunters, the recommended speed range is not less than 1000 rpm.

Noise Level

For gear dividers, excessive noise is produced when the rotational speed exceeds 1800 rpm, which is unacceptable to us. Therefore, it is essential to select the divider's displacement appropriately during the design phase.

Contact Lujhu Engineer well in advance when selecting a synchronous motor, to choose the appropriate hydraulic synchronous motor.