TORQUETRAK

ROTARY TORQUE SENSORS & SHAFT POWER METERS

TORQUETRAK PRODUCTS & SERVICES

 Binsfeld’s TorqueTrak rotary torque measurement systems measure the true mechanical torque and power output of virtually any rotating shaft without the need for shaft modification or disassembly. Simply mount the strain gage sensor onto an existing shaft and connect a Binsfeld torque measurement system. In less than a day you will start to reveal performance data that will help you make decisions and give you peace of mind. Since we started out in the field, you can rest assured that TorqueTrak systems have been designed to be user-friendly, robust, and will come backed by the superior technical support our customers have grown to expect over the last 40 years.

Need to measure torque or power but don’t want to do it yourself? Binsfeld also offers on-site torque measurement and strain gaging services. Contact us today to discuss your application!

TEMPORARY TORQUE MEASUREMENT

PERMANENT TORQUE & POWER MONITORING

TORQUETRAK 10K

Temporary torque measurement system for rotating shafts.

TORQUETRAK 10K-LP

Low-profile temporary torque measurement system for rotating shafts.

TORQUETRAK TPM2

Sealed torque and power monitoring system with digital data output.

TORQUETRAK REVOLUTION

Torque and power monitoring system with analog data output

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TORQUETRAK 10K

Temporary torque measurement system for rotating shafts.

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TORQUETRAK 10K-LP

Low-profile temporary torque measurement system for rotating shafts.

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PERMANENT SHAFT POWER METERS

TORQUETRAK TPM2

Sealed torque and power monitoring system with digital data output.

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TORQUETRAK REVOLUTION

Torque and power monitoring system with analog data output

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BENEFITS OF USING TORQUETRAK PRODUCTS AND SERVICES

  • Reduced downtime – Know when shaft performance is degrading when maintenance is needed (Predictive Maintenance)
  • Increased efficiency – Ensure machine is running at peak performance and identify excessive energy losses in couplings, gears, and bearings
  • Reduced operation costs – Keep things running at peak efficiency to increase equipment longevity and ensure less downtime
  • Smart troubleshooting – Quickly and accurately determine the root cause of malfunctioning equipment

MARKETS & APPLICATIONS 

FAQ

What is the difference between a torque sensor, a torque transducer, and a torque meter?

These words are often used interchangeably to describe the same thing – a device that measures torque. All types of these measurement devices convert a mechanical measurement (such as strain) to an electrical signal that correlates to a torque measurement value. Transferring the signal from the object being measured to a data acquisition device usually requires wires to create a “path” for the signal to travel.

What are rotary torque sensors, rotary torque transducers, or shaft torque meters?

In the special case where the object is rotating (such as with a shaft), a standard wired torque transducer will not work. Instead a torque measurement device that uses wireless data transfer must be used. These devices are often called rotary torque sensors, rotary torque transducers, or shaft torque meters. These devices are commonly used to measure the torque on driveshafts, couplings, gears, propellers, and brakes. When speed is added to the equation, shaft power can be calculated. Devices that include the speed measurement as part of the systems are known as shaft power meters.

How does a rotary torque sensor work or shaft power meter work?

The following is a description of how Binsfeld’s rotary torque sensors and shaft power meters work. The basic steps are as follows:

  1. Strain gage is installed on the shaft
  2. Strain gage is powered
  3. Strain gage converts strain to signal
  4. Signal is output off the via a transmitter
  5. Signal is converted to torque measurement value
  6. Speed is measured and combined with torque to output power measurement
​CONVERTING STRAIN TO A SIGNAL USING STRAIN GAGE

Strain gages are mounted directly on the shaft to measure torque. Strain gages use a 4-arm wheatstone bridge circuit that changes in resistance proportional to the amount of strain (deformation) it experiences. Torque strain gages are specially designed to maximize the amount of deformation of each of the arms. As the arms become longer, the electrical resistance goes up, as they become shorter, the resistance goes down. The change in resistance creates a voltage change on the signal line which then needs to be transferred off the shaft.

Other types of torque transducers (such as in-line load cells) are often less desirable since they require disassembly or modification of the shaft.

Figure 1 – How a strain gage works
TRANSFER OF SIGNAL OFF THE SHAFT – INDUCTIVE

Binsfeld’s permanent torque and power monitoring products use induction to transfer torque sensor data. In these systems, a stationary power ring is connected to an external power source, creating a magnetic field that “induces” a current on the shaft collar. The current powers the transmitter, which energizes the strain gage. When torque is applied to the shaft, the torque signal is received by the transmitter and digitized. The digital signal is transferred back to the power coil, and converted to an analog (or digital) output via the master control unit.

Figure 2 – A typical diagram of an inductively powered permanent system
TRANSFER OF THE SIGNAL OFF THE SHAFT – HIGH FREQUENCY RF

Binsfeld’s temporary torque measurement products use high frequency RF to transfer the torque signal off the shaft. In these systems, a battery-powered transmitter energizes the strain gage, receives the torque signal, then converts the torque signal to a radio frequency signal, which is received by a nearby “receiver”. The receiver converts the radio frequency signal back to an analog (or digital) output.

Other types of data transfer, such as slip rings, are less desirable because they rely on direct contact with the shaft, leading  to wear/degradation over time and the added potential of inducing noise in the signal.

Figure 3 – Temporary torque measurement system components (TorqueTrak 10K)
CONVERTING SIGNAL TO A TORQUE MEASUREMENT

Once the signal is processed and output in either a digital or analog format, the properties of the shaft, strain gage, and transmitter gain are used to convert the value to a true mechanical torque measurement. (See the torquetrak calculator page)

For example, using the TT10K Calculator, a 5″ diameter steel shaft with a transmitter gain of 4000 and a gage factor of 2.0 has a full scale torque value of 283,196.45 in-lb. This means that a 10V output correlates to 283,196.45 in-lb. This factor can be applied accordingly to correlate any voltage output to a true torque value.

ADDING SPEED TO GET POWER

A shaft power meter also measures torque but includes the additional measurement of speed. These measurements are combined using the below equations to provide the true mechanical power output on a shaft.

Power (KW) = Torque (N*m) x shaft speed(rpm) / 9550

Power (HP) = Torque(in*lb) x shaft speed(rpm) / 5252

The TorqueTrak TPM2 and Revolution have speed sensing built in, while the TorqueTrak 10K temporary system requires an additional speed sensor and a data aqcuisition device (such as the OpDAQ Field Test 2) to “integrate” the signals into a true power output.

Using a shaft power meter is the most accurate way of measuring the power output of a motor. Other methods of power measurement, such as at the motor with an electrical device (i.e. a watt meter) are less accurate since the measurements include power loss of other system components (i.e. bearings and couplings). Watt meters do not reveal the exact power output of the engine – to do that you must measure the true mechanical horsepower at the shaft.

BINSFELD ENGINEERING INC.

4571 W. MacFarlane Rd.
Maple City, MI 49664 USA

  231.334.4383
  Contact Us
Z  ISO 9001:2015 Certified

TORQUETRAK

Binsfeld's Torque Measurement Systems measure true mechanical torque and power on rotating shafts. We also offer consultation, strain gaging and installation services.

TEMPTRAK

Binsfeld's Rotary Temperature Transmitter Systems provide accurate and reliable temperature control on heated godets and calendars. We also offer design and OEM services.

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