Variable Speed Pump Drives are Now Simpler and More Efficient
Perhaps you have been looking into variable speed pump drives, which can save you as much as 70% in energy costs incomparison to conventional solutions, but were hesitant because of their greater complexity. It is for people like you that Parker has developed its new and inventive version of a Drive Controlled Pump. This pump combines an optimized axial piston pump and dual displacement volumes, and its compact synchronous servo motor provides many benefits over other variable speed pump systems.
Less Effort and a Better Result
In speed-variable applications, pumps that provide constant displacement, which include vane pumps and internal gear pumps, are commonly used. With these pumps, maximum torque is reached at maximum pressure. This creates high motor current in the drive system, determined by the frequency inverter. With variable pumps, you can further adjust displacement of the pump, which reduces the maximum motor torque. But if you would like to configure the displacement directly, you must use a displacement controller, and this is relatively expensive. Because of this Parker now has a new version of its PVplus axial piston pump, which has a dual displacement pump. With this pump, you can switch displacement between two continuously adjustable configurations, and — when used in conjuction with a variable-speed drive — you receive the following benefits:
- Low torque, due to destroking of pressure, resulting in lower acquisition costs for both the frequency converter and the motor
- Fast traversing speeds through upstroking when using the rapid drive mode
- No discontinuous movement as there is no need to shift between multiple pumps
- Easier pipework and provisioning
- Increased operating pressure, productivity and energy efficiency
Compact and High-Powered Synchronous Servo Motor
The pump used in combination with Parker’s GVM-series synchronous motor, which you can connect without a bell or coupling housing through a wave-in-shaft system, results in a compact and dynamic device for a wide variety of applications. It has drive power of upward to 125 kW and a 400 Nm rated torque is currently available. A version is also in development that can provide up to 800 Nm of torque.
The motor is cooled by liquid, and it has the same output as a typical IE3 motor with one-half or even one-quarter of the size, and without fan noise. Because of its high heat capacity, an especially good choice for cooling it is water, but you can also use mineral oil or water glycol. The maximum inlet temperature is 65°C, enabling direct cooling through the hydraulic unit’s cooling circuit.
The Drive Controlled Pump system has been extended with a dual displacement pump (and a motor that is liquid-cooled and synchronous) specially for applications such as presses, where pressure and flow rate needs may vary greatly during work cycles. Our solution brings together the capabilities of Parker’s axial piston series PVplus pumps with GVM synchronous motors and their high dynamics and power density. This lets you lower the amount of torque used in comparison to fixed displacement pumps, and it can do this even in the most demanding of applications, and it is both more cost-effective and smaller. Furthermore, the installation and provisioning of the pumps are much like conventional solutions. Additionally, there is no need for multi-variable control, which makes using the system much easier.
You can find more information about Parker’s Drive Controlled Pump and it dual displacement pump (along with its GVM motor) by contacting our sales department.