Variable Displacement Pump and Controls-Applied to Variable Speed-Variable Torque Drive Systems

1976 ◽  
Author(s):  
L. M. Claar
Keyword(s):  
Variable Speed ◽  
Displacement Pump ◽  
Variable Displacement ◽  
Drive Systems

scholarly journals Energy Saving Strategy of the Variable-Speed Variable-Displacement Pump Unit Based on Neural Network

Procedia CIRP ◽  
2019 ◽  
Vol 80 ◽  
pp. 84-88 ◽  
Author(s):  
Rui Jin ◽  
Haihong Huang ◽  
Lei Li ◽  
Libin Zhu ◽  
Zhifeng Liu
Keyword(s):  
Neural Network ◽  
Energy Saving ◽  
Variable Speed ◽  
Pump Unit ◽  
Displacement Pump ◽  
Variable Displacement

Energy Efficiency of Displacement Control Drive Systems in Hydraulic Forming Presses

2019 ◽  
Vol 141 (4) ◽  
Author(s):  
Christer Schenke ◽  
Jürgen Weber
Keyword(s):  
Energy Efficiency ◽  
Energy Consumption ◽  
Deep Drawing ◽  
Control Methods ◽  
Displacement Control ◽  
Valve Drive ◽  
Displacement Pump ◽  
Variable Displacement ◽  
Drive Systems ◽  
Two Alternatives

Hydraulic deep drawing presses are manifold machines that can be used for a number of use cases. The general need for the reduction of the energy consumption of industrial machines forces press manufacturers and owners to optimize their machines and processes. This article presents methods for the analysis and optimization of the drive systems of a hydraulic deep drawing press with four-point die cushion. For the slide drive, two alternatives of control methods for speed variable displacement pumps are compared to the conventionally used displacement pump with a constant speed. For the drive of the die cushion, two displacement control drive systems are compared to a conventional valve drive system.

Improving the Energy Efficiency of a Hydraulic Press Via Variable-Speed Variable-Displacement Pump Unit

2018 ◽  
Vol 140 (11) ◽  
Author(s):  
Haihong Huang ◽  
Rui Jin ◽  
Lei Li ◽  
Zhifeng Liu
Keyword(s):  
Energy Efficiency ◽  
Hydraulic Press ◽  
Variable Speed ◽  
Pump Unit ◽  
Forming Process ◽  
Drive Unit ◽  
Rotating Speed ◽  
Displacement Pump ◽  
Variable Displacement ◽  
Load Conditions

Hydraulic presses are widely applied in various forming processes to manufacture products with complex shapes, however, they are energy-intensive. In order to lower the energy consumption, a variable-speed variable-displacement pump unit (SVVDP) was developed for hydraulic presses, where the flow rate required by the press in a forming process can be realized by changing the motor rotating speed and the pump displacement simultaneously. A theoretical model was built to reveal the energy dissipation behavior of the drive unit, which shows that the energy efficiency of the drive unit can be optimized by varying the rotating speed of the motor under a variety of load conditions. An experimental platform with a SVVDP was established to find the optimum rotating speed and the corresponding displacement in different load conditions, and experimental results verified the improved energy efficiency of the SVVDP compared with that of the commonly used single variable drive unit. By employing the strategy that the determined optimum rotating speeds in different load conditions were preset as recommended values for the drive unit working in different operations, the proposed drive unit was applied to a press completing a forming process and the results indicate significant energy saving potentials.

Energy-saving design of variable-displacement bi-directional pump-controlled electrohydraulic system

2020 ◽  
pp. 095965182097389
Author(s):  
Samir Kumar Hati ◽  
Nimai Pada Mandal ◽  
Dipankar Sanyal
Keyword(s):  
Energy Saving ◽  
Absolute Error ◽  
Fast Response ◽  
Maximum Energy ◽  
Radial Clearance ◽  
Simulation Based Design ◽  
Simulation Based ◽  
Displacement Pump ◽  
Variable Displacement ◽  
Axial Piston

Losses in control valves drag down the average overall efficiency of electrohydraulic systems to only about 22% from nearly 75% for standard pump-motor sets. For achieving higher energy efficiency in slower systems, direct pump control replacing fast-response valve control is being put in place through variable-speed motors. Despite the promise of a quicker response, displacement control of pumps has seen slower progress for exhibiting undesired oscillation with respect to the demand in some situations. Hence, a mechatronic simulation-based design is taken up here for a variable-displacement pump–controlled system directly feeding a double-acting single-rod cylinder. The most significant innovation centers on designing an axial-piston pump with an electrohydraulic compensator for bi-directional swashing. An accumulator is conceived to handle the flow difference in the two sides across the load piston. A solenoid-driven sequence valve with P control is proposed for charging the accumulator along with setting its initial gas pressure by a feedforward design. Simple proportional–integral–derivative control of the compensator valve is considered in this exploratory study. Appropriate setting of the gains and critical sizing of the compensator has been obtained through a detailed parametric study aiming low integral absolute error. A notable finding of the simulation is the achievement of the concurrent minimum integral absolute error of 3.8 mm s and the maximum energy saving of 516 kJ with respect to a fixed-displacement pump. This is predicted for the combination of the circumferential port width of 2 mm for the compensator valve and the radial clearance of 40 µm between each compensator cylinder and the paired piston.

Robust Nonlinear Control of a Novel Indexing Valve Plate Pump: Simulation Studies

2002 ◽  
Vol 124 (4) ◽  
pp. 613-616 ◽  
Author(s):  
X. Zhang ◽  
S. S. Nair ◽  
N. D. Manring
Keyword(s):  
Pressure Control ◽  
Plate Motion ◽  
Nonlinear Simulation ◽  
Response Characteristics ◽  
Model Free ◽  
Swash Plate ◽  
Displacement Pump ◽  
Variable Displacement ◽  
Robust Adaptive ◽  
Improved Performance

A robust adaptive pressure control strategy is proposed for a novel indexing variable-displacement pump. In the proposed approach, parametric uncertainties and unmodeled dynamics are identified to the extent possible using a model free learning network and used to decouple the dynamics using physical insights derived from careful reduced order modeling. The swash plate motion control is then carefully designed to provide the desired pressure response characteristics showing improved performance with learning. The proposed control framework and designs are validated using a detailed nonlinear simulation model.

Fundamentals of Solid-State AC Variable-Speed Drives

1969 ◽  
Vol 6 (01) ◽  
pp. 76-82
Author(s):  
Donald L. Schoen
Keyword(s):  
Solid State ◽  
High Performance ◽  
Practical Implementation ◽  
Variable Speed ◽  
Variable Speed Drives ◽  
Ac Drive ◽  
Ac Motor ◽  
Economic Trends ◽  
History Of ◽  
Drive Systems

Solid-state ac variable-frequency drives offer a new generation of high-performance, maintenance-free drive systems. The desire to use the rugged ac motor as a high-performance, variable-speed device goes back many years; however, its practical implementation had to wait three-quarters of a century for development of the silicon controlled rectifier. This paper opens with a brief review of the history of variable-speed dc and ac drive systems. Then the fundamentals of solid-state ac variable-speed drives are presented with emphasis on future technical and economic trends. The ac system is evaluated as an economic solution to providing basic functional drive requirements. The characteristics are compared with traditional high-performance dc systems. Finally, an attempt is made to describe the solid-state ac variable-speed drive of the future.

EMC Installation for Variable Speed Drive Systems (VSDs)

2019 ◽  
pp. 308-329
Author(s):  
Safwan Nadweh ◽  
Zeina Barakat ◽  
Ghassan Hayek
Keyword(s):  
Motor Control ◽  
Electromagnetic Fields ◽  
Capacitive Coupling ◽  
Variable Speed ◽  
Variable Speed Drive ◽  
Drive Systems

This chapter introduces EMC installation for variable speed drive systems. As an introduction, EMC standards have been mentioned in order to define the requirements characteristics, besides the fundamentals of static, electric, magnetic, and electromagnetic fields. Both inductive and capacitive coupling have been discussed to deal with shielding. Finally, VSDS emission and electromagnetic interferences were studied with installation requirement in VSDS (supply cables, cable between converter and motor, control cables, earthing requirements, and grounding).

Sign in / Sign up

Export Citation Format

Share Document