What is a Variable Flow Vane Pump?
The variable-speed hydraulic pump stands as a prime example of the evolution of electric drives, now dominating the pressure supply system in the industry. Offering potential energy savings, power density, and reduced noise levels, it proves to be a promising choice for hydraulic systems. The future of hydraulics lies in standalone individual drives, even though electromechanical drives are costly due to electric motors and converters. Electrohydraulic actuators, on the other hand, offer excellent functionality. The concept of fixed motors in drives makes them large and expensive, limiting pump choices for four-quadrant operation and increasing costs.
A combination of adjustable-flow pumps and variable-speed electric motors results in the most energy-efficient solution, but fixed-displacement pumps are recommended for smaller flow rates due to cost considerations. Asynchronous and synchronous electric motors have distinct characteristics, with synchronous motors requiring frequency converters to operate. Consideration of motor rotation speed is essential when selecting the most suitable motor for hydraulic pumps. Hydraulic pumps often have limitations due to noise characteristics, centrifugal forces, and suction capacity when used with electric drives.
Variable-speed pumps allow flow rate and pressure control directly through the pump rotation speed. High torques and low internal leakage are crucial for variable-speed pumps, and piston machines have an advantage in this regard due to precise sealing gaps. Vane pumps also provide compatibility for internally moving torque, with high efficiency at medium pressures. Efficiency is vital at high rotation speeds and pressures, as this is where most energy is used in the system.
In conclusion, the variable-speed hydraulic pump, in combination with appropriate electric motors, provides a compelling solution for advancing electric drives in hydraulic applications. Careful consideration of motor selection and pump characteristics ensures optimal performance and efficiency, making it a promising choice for future hydraulic systems.
