The NJ-SERVO electric motor driven actuator utilizes an electric motor drive system. High accuracy test control is enabled by a special servo motor and stroke displacement measurement sensor. In addition, the system configuration is simpler in comparison to hydraulic actuators, so it is easy to maintain, and achieves power savings and space savings. This system accommodates a wide range of tests with a high degree of expandability. This includes everything from endurance evaluations of the main body and assemblies of automobiles, aircrafts, and other transportation equipment to endurance evaluations of stand-alone parts; from multi-axis tests combining multiple actuators to uniaxial tests; and from sine waves to working waveform simulation tests.

The Performance Required for Endurance Tests

The system accommodates everything from static to dynamic tests across the full actuator capacity range. The test conditions can be set as you wish.

High speed tests at up to 72 cm/sec are supported.

High speed control is achieved at 72 cm/sec in single wave tests and 50 m/sec in continuous endurance tests. It can be applied to a variety of tests at low to high speeds.

The system achieves high peak reproducibility, and high accuracy measurement and control.

High accuracy measurements are achieved thanks to the built in stroke sensor and a special load cell for dynamic testing. High stability test peaks are achieved thanks to the high response control of the 4830 controller.

Power Savings of Approximately 75%

The electric motor driven actuator only uses the power output required for each test, so power consumption is substantially reduced in comparison to hydraulic actuators with similar specifications. If a 10 kN system is used, power consumption can be reduced approximately 75 %, and CO₂ emissions can be reduced approximately 305 kg.

• When implementing 7 day testing with a displacement of ±40 mm and a test force of ±2.3 kN
• Power conversion factor: 0.378 kg-CO₂/kWh
• During actual use, power consumption will differ depending on the installation conditions and the room temperature.

Labor-Saving System Changes

The electric motor driven actuator can be driven solely by a servo amplifier anda controller.
In contrast to a hydraulic type testing system, thick hydraulic hoses and a hydraulic power supply are not necessary. This saves on space, makes the system easy to move, and simplifies testing system changes. Naturally, it is motor driven, so there is no need for periodic replacement of hydraulic oil, and hydraulic servo valve overhauls are not required.

Basic System
Electric jack unit (Option: Bracket mount and frame)
+ Servo amplifier
+ 4830 controller (Option: Software)

Thanks to highly responsive control and accurate waveform reproducibility, loads can be applied to products with high accuracy input waveforms.
Thanks to stable waveform input, the system is capable of endurance testing with high accuracy and high reproducibility, and the evaluation of slight differences in product performance.

-Capable of More Complicated Control and Storage of Test Results Thanks to a Variety of Software Programs-

Controller for Dynamic and Fatigue Testing Machines

Servo Controller 4830

Windows software for 4830 series

For Dynamic and Fatigue Testing of Various Materials and Small Parts

This series features an E-type frame with a bottom-mounted actuator, which can satisfy a wide variety of dynamic and fatigue testing requirements, from fatigue testing of materials to evaluating the performance of components.

Dynamic Capacity Rating of Actuators 50 kN / 100 kN / 200 kN

This series is capable of static, dynamic, and fatigue testing of a wide range of materials, from plastics to aluminum, composites, and steel.

High Rigidity and Large Testing Space

The large testing space supports material fatigue testing in a high-temperature or thermostatically controlled environment, thermal fatigue testing, fracture toughness evaluation, component performance and endurance testing, and so on. Accessories for respective tests are available. These include grips, compression plates, extensometers, and testing environmental control systems.

Dual-Stage Crosshead Drive Mechanism

The hydraulic crosshead drive and hydraulic clamp can be operated more intuitively using handles.
This dual-stage configuration helps prevent operating errors and accidents.

USF-2000A Features

• Accelerated evaluation of the fatigue life of metals and materials is possible at 20 kHz cycle speed. Even 10¹⁰ cycle tests are completed in a mere six days.
• Significant stress can be produced by testing under resonance conditions, and furthermore is economical.
• Constant stress amplitude control is possible via the controller (provided) with the PC.
• Optimal for long-life evaluation of materials and high-speed vibration replication experiments.
• The test system is extremely compact, allowing it to be installed anywhere.
• The Windows software provided can be used for easy testing from design of resonance specimens through to actual testing.

20 kHz Fatigue Testing Ultra Efficient for Gigacycle Testing ​Also for Analyzing Inclusions in Metals

This ultrasonic fatigue testing system achieves a vibration rate of 20 kHz by applying a vibration generated by a Piezoelectric element and amplified by a horn. This not only significantly reduces cycle times, it also helps discover microscopic defects and inclusions in high-strength steel materials, which can cause fatigue fractures at the megacycle level.

Capable of Testing 1000 MPa Class Steel Material

High stresses can be generated by performing tests at resonance frequencies. With a 20 kHz cycle capacity, this system is able to accelerate fatigue life evaluations of metals and other materials. It is perfect for long service life evaluation of materials or high-speed vibration testing.

Operating Principle of the Ultrasonic Fatigue Testing System

Testing at Resonance Frequency

The JF Series Force Simulator was developed with the emphasis on light weight, compact size and ease-of-use as a general-purpose, compact jack for the Servopulser system. Testing systems installed with the Force Simulator can easily perform endurance, fatigue and simulation tests on small structural members and various other structural members, which helps improve the logical design and reliability of products.

[Features]

• Lightweight
  Jack (20 KN ±100 mm) weighs 25 kg. The jack’s self-weight hardly affects the specimen when a dynamic load is applied.
• Compact
  The jack is compact, which means a small installation footprint on the specimen.
• Easy handling
  The lightweight and compact actuator is portable and easy to install. Hydraulic hoses are easy to connect using one-touch couplings.
• Diverse Mounting Options
  A wide range of optional mounting brackets allows specimens to be mounted in a variety of angles.
• Testing Systems Can Be Easily Configured
  Testing systems can be easily configured by combining a portable hydraulic unit, 4830 controller and test jig with Force Simulator.

[Actuator Size and Weight]

*1: The weight includes the load cell and servo valve.
*2: The overall length is the dimension at the central position, with the load cell attached.

[System Configuration Example]

[Standard System Configuration and Main Specifications]

[Evaluation Targets]

Fatigue strength/Hydraulic actuation, Automobile parts/chassis

* Appearance and specifications are subject to change without notice.

For Evaluating the Fatigue and Endurance Characteristics of Micro Materials and Parts in Clean Environments

The crosshead can be positioned easily using a manual handle and lever.

The actuator can be bottom-mounted as well.

A microscope can be installed for viewing micro samples during testing.

The thermostatic water immersion test unit is ideal for testing biological material and implants.

Fatigue and Endurance Testing Machine with Direct Electrically Powered Actuator

Environmentally Friendly

• Actuating the system directly with electricity makes it highly efficient.
• Generates no waste oil, which can have a large environmental load.
• The instrument provides a clean site environment and does not contaminate the surrounding area.

Fast, Large Movements

• Capable of sine wave cycle testing at speeds up to 2 m/s.
• Offers stroke lengths up to ±50 mm.
• Allows ±20 µm displacement amplitude at 200 Hz frequencies.

Low operating costs minimize overall cost

• Uses as little power as possible to allow continuing tests with no waste.
• Requires no hydraulic oil, filters, or other consumables.

Offers highly precise measurement and control, outstanding operability, and clever functions

• Allows 24-bit rangeless, high-resolution test force measurement and control.
• Offers full digital control for autotuning control parameters and waveform correction.
• Allows performing offset load tests with high precision.
• Allows contact tests.
• Includes a specialized interactive controller that interacts via a color LCD screen and touch panel.
• The testing space (vertical direction) is changed electrically, making operation easy.

Allows Long Stroke Lengths and Fast and Highly Accurate Testing in a Clean Environment

A dual-stage drive mechanism enhances safety.

Dual type and light resistant test

Due to the large testing space, tests can be performed inside a thermostatic chamber.

For Endurance Testing and Functional Testing of Actual Specimens