ASR Series Yuken AC Servo Motor Driven Pumps

1. Product Overview

2. Core Features

1. Excellent Energy-Saving Effect

• On-demand oil supply: Adjusts flow and pressure in real-time according to system requirements, eliminating overflow losses
• Energy savings of 30-70%: Compared to traditional fixed displacement pump systems with throttling control, with power consumption less than half that of hydraulic machines and equivalent to that of full electric machines[3];
• Reduced heat generation: Lower energy consumption minimizes hydraulic oil temperature rise, extending oil life, reducing cooling system load, and allowing for a significant reduction in fuel tank capacity;

2. Compact Integrated Design

• All-in-one unit: Integrated motor and piston pump assembly, saving up to 40% in both mass and volume compared to the AR series variable displacement piston pumps, realizing a highly lightweight and compact design;
• Simplified piping: Reduced hydraulic connections improve system reliability and reduce leakage risks
• Lightweight construction: Easier handling and installation compared to separate motor-pump configurations

3. Precision Control Performance

• Precise speed/torque control: Equipped with a special high-power servo motor (SPM) and variable displacement piston pump, utilizing YUKEN’s dedicated AMSR controller for closed-loop control, with flow control hysteresis and repeatability both less than 1%, no additional encoders required[3];
• Fast response time: Servo motor control enables rapid acceleration/deceleration and pressure changes, with excellent ultra-low speed molding and continuous pressure holding performance;
• Stable pressure holding: Maintains consistent pressure during molding cycles, improving product quality consistency

4. Low Noise and Environmental Protection

• Low noise operation: Noise can be reduced to a minimum when idle or under pressure control (motor basically shuts down), with noise as low as 55 dB(A) under specific conditions (7MPa pressure, 1500r/min pump speed, 1m measurement distance)[3];
• EMC filter: Environmentally friendly design reduces electrical noise interference
• Lower carbon footprint: Energy efficiency contributes to reduced greenhouse gas emissions

3. Model Specifications

4. System Composition and Working Principle

1. Basic Structure

• AC servo motor: High-efficiency, brushless special high-power servo motor (SPM) with precise speed control, available in full-closed natural cooling or forced air cooling types[3];
• Axial piston pump: YUKEN’s high-performance variable displacement piston pump with low noise and high efficiency, based on long-term manufacturing experience for high reliability[3];
• Dedicated servo controller: AMSR controller for integrated pump-motor closed-loop control, with compact design, simple wiring, and digital parameter setting via dedicated software;
• Operation panel: User-friendly interface for monitoring and parameter adjustment
• Safety protection system: Comprehensive error detection and alarm functions

2. Working Principle

1. The AMSR servo controller receives flow/pressure commands from the host machine (e.g., injection molding machine) and sensor signals, performing control calculation to form a closed-loop control system;
2. Controls the servo motor’s rotational speed and torque to adjust pump output precisely
3. Delivers only the required amount of hydraulic oil at the exact pressure needed
4. Eliminates energy waste from traditional relief valve overflow

5. Main Application Fields

1. Injection molding machines: Ideal for precision molding with fast cycle times and stable quality
2. Die casting machines: High pressure and flow control for casting processes
3. Hydraulic presses: Precise pressure control for forming operations
4. Plastic extrusion equipment: Consistent flow for uniform product dimensions
5. Power machinery: Low noise and energy efficiency for power generation facilities
6. Automated production lines: Fast response and compact design for space-constrained applications; can achieve large flow up to 3200L/min by combining multiple pumps;

6. Summary of Technical Advantages

• Energy efficiency: Reduced operational costs, environmental impact, and hydraulic oil heating, with power consumption comparable to full electric machines[3];
• Precision control: Enhanced product quality and process repeatability, with excellent ultra-low speed molding and stable pressure holding performance[3];
• Space saving: Compact and lightweight design (40% reduction in mass and volume compared to AR series), simplifying machine layout and installation;
• Low noise: Improved working environment and compliance with noise regulations
• Reliability: Fewer components and reduced heat extend system lifespan