Product

RTS

Rotation Torque Sensor

  • - easures true torque using a distributed force sensor system
  • - Enbles direct coupling to crankshaft
  • - Measures thrust and radial force simultaneously

The RTS is a shaft torque sensor with distributed force detection and was created from A&D's DSP technology and high-speed telementry technology.
The RTS enables simultaneous, non-contact measurement of torque, thrust, and radial forces.
It is possible to measure and display high-speed, detailed phenomenon at 10 times resolution and 10 times speed.

RTS

Features of Distributed Force Measurement Technology

  • With conventional torque sensors and component force meters, there is a bridge circuit made up of 4 strain gauges for each torque or component force. However, the RTS utilizes a distributed force system that evenly distributes dedicated 4 element strain gauges at the sensors.
  • The distributed force detection method makes it possible to perform model calculation using components forces in the area of strain. This makes it is possible to calculate true torque precisely without the influence of thrust and radial forces, while still simultaneously measuring thrust and radial forces.
  • Because torque is measured as multiple distributed forces, it is possible to lower the noise of model-calculated torque signals compared to conventional methods.
  • The distributed force detection method uses 4-element strain gauges. These specially designed strain gauges are arranged for heat balance within an extremely small area to form a bridge circuit that eliminates the influence of heat gradients and temperature changes.

Example of torque measurement between crankshaft and flywheel

Torque measurement at Engine Test Cell

Torque measurement at Engine Test Cell

You can see that the generated torque waveforms are different at each cylinder, as well as the synchronization of the torque waveform and inner cylinder pressures.

  • Tq : Torque waveform
  • P1-P4 : Inner pressure of each cylinder
  • Ne : Rotation speed

20 Mbps Telemetry

(Realizing real-time, high precision measurement through the development of a high-speed, high-capacity telemeter.)

  • Large amounts of digital distributed force data are simultaneously sampled and transferred using a 20 Mbps telemeter.

Simultaneous rotation measurement

  • The douser of a rotary encoder is attached to a sensor and its rotation angle information is measured simultaneously. After processing angular information, angular velocity, component forces, and work rate are output as processing data.

Model cycle processing and frame measurement

The torsion gauge signal is digital and is calculated by the DSP at high speed using the matrix-vector method.

Digital/analog data linkage

Noise-free and high precision torque can be used as a feedback signal via the digital data link. All data can be stored on a PC.

  • CAN, Ethernet
  • Analog system, DA voltage output ±10V

Frame measurement

Frame data output : Can block-transfer 20μ second sampling data
The recording of frame measurement can be started by a timer, an interval, or external trigger.

Operation example with direct coupling to an engine crankshaft at A&D's Engine Test Cell

Installation example of coupling to dynamometer intermediate shaft at A&D's Engine Test Cell

Torque sensor evaluation

Weight type torque tester

Example of torque meter features

  • Cycle test
  • This test loads positive or negative torque continuously.
  • It is the strictest evaluation method for torque meters.
  • The RTS shows a performance of 0.01% FS (FS=1kNm).

RTS concept diagram

RTS concept diagram

Setting and operation screens

Digital display

Digtal display
  • Torque, power, and rotational speed are displayed digitally.

Setting display

Setting display
  • CAN settings
  • Settings for analog output
  • Upper and lower limit settings
  • Torque zero correction

Trend graph display

Trend graph display
  • The trend graph displays the torque, power, and RPM.

RTS specifications

Sensor device specifications

Measurement range 500Nm 1kNm 2kNm Unit Note
Model RTS-E500 RTS-E1k RTS-E2k    
Torque specifications
Rated capacity 0.5 1 2 kNm  
Safe overload 200 %RC  
Maximum overload 300 %RC *1
Overall error 0.03 %RC *2
Non-linearity 0.02 %RC *2
Hysteresis 0.02 %RC *3
Repeatability 0.02 %RC *4
Resolution 0.02 %RC  
Temperature specifications
Temperature influence at zero point 0.003 %RC/ ℃  
Temperature influence on sensitivity 0.003 %Load/ ℃  
Compensation temperature range -10~+60 ℃  
Operational temperature range -12~+80 ℃  
Storage temperature range -12~+85 ℃  
Rotation specifications
Maximum RPM 10,000 6,000 rpm  
Continuous RPM 10,000 6,000 rpm  
Rotation variation at zero point 0.05 %RC  
Machine characteristics
Inertia moment 0.0047 0.0047 0.0181 kg•㎡  
Torsion stiffness 800 1,600 5,600 kNm/rad  
Torsion character frequency 5.6 5.8 5.6 kHz *5
Torsion degree 0.6*10-3 0.6*10-3 0.35*10-3 rad  
Maximum thrust load 10 20 30 kN  
Maximum radial load 10 20 30 kN  
Maximum curve moment 0.5 1 2 kNm  
Weight of rotor 3 3 5 kg  
  • *1:By static torque test including non-linearity and hysterics.
  • *2:Reference values
  • *3:By static torque test
  • *4:@BW=100Hz
  • *5:Torsion angle at rated torque

Measurement display device specifications (AD7891)

Display 5.7 inch TFT LCD
Displayed contents Digital display of 3-component force, torque
Data output section
Data interface Analog voltage (0 to +/-10V)
Digital data output
CAN
Data file recording

We have a high-speed control model that can run at a model cycle of 5 kHz.
Please consult with for more details.

Exterior dimensions of RTS-E

Type A ΦB ΦC ΦD ΦE ΦF G H I J K ΦL Bolt strength grade Screwing torque
RTS-E500/1kNm 148 Φ120.8 Φ75 g6 Φ75 H7 Φ120 Φ188 70 15 38 8-MΦ10 8-MΦ10 101.5 10.9 or greater 60Nm
RTS-E2kNm 165.5 Φ155.8 Φ90 g6 Φ90 H7 Φ155 Φ223 80 18 46 8-MΦ12 8-MΦ12 130.0 10.9 or greater 100Nm

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