Bearingless Digital

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Torque is a vital process parameter in many industries and accurate measurement is essential. Many torquemeters give good results in laboratory conditions but disappoint out in the real world. For highest precision in real-world applications, choose an S. Himmelstein and Company bearingless torquemeter. Our bearingless torquemeters deliver very high accuracy in challenging conditions. Excellent EMI immunity permits use in electrically noisy environments while high stiffness yields wide installed bandwidth and fast response. Bearingless torque sensors will tolerate significant misalignment and installation is straightforward. High overrange capability ensures excellent response when torque varies rapidly.

About Bearingless Digital Torquemeters

Robust, high-accuracy torquemeters measure torsional forces with strain gages. Extension and compression under varying loads create small electrical signals. Coupled in a Wheatstone bridge arrangement, these signals indicate torque experienced by the shaft. Like torquemeters with bearings, a bearingless torque transducer is mounted in line directly on the shaft between driving and driven equipment, and without couplings. What most distinguishes the bearingless transducer visually is a large rotor that passes through an external stator. Torque signals are digitized on the rotor for transmission to the stator. This design reduces overall length, which can simplify integration when space is tight. However, the more significant benefits are increased stiffness and lower frictional losses. Other features of bearingless digital torque transducers include:

Stiffness and overrange — Being more compact, the bearingless torque transducer has greater torsional stiffness. In addition, installation without additional couplings creates a torsionally stiff driveline with low overhung moment and short overall length. This results in wide installed bandwidth, fast response to torsional transients and industry-leading overrange capability.

Overrange is defined as the highest torque at which measurement error is less than 1 percent of full scale. In most applications torsional loads fluctuate rapidly in response to pulsation at the driving end. This is due to the action of motor poles, internal combustion engine pistons or gear meshing. High overrange capability prevents peak clipping and ensures accurate torque data.

Low friction — All bearings, no matter how carefully selected or how thoughtful the design, impose a degree of frictional loss in the driveline. Omitting bearings from the design of the bearingless torque transducer leads to measurements that better reflect actual operating conditions. A further benefit is the ability to run at higher rotational speeds.

EMI Immunity — S. Himmelstein and Company bearingless torque transducers are engineered to minimize the impact of EMI noise, as emitted by variable frequency drives (VFDs). This avoids the interference problems that plague competing products.

Applications of the S. Himmelstein and Company bearingless torquemeter

Our bearingless torque sensors are designed for use in a wide range of assembly and testing applications. The automotive and aerospace sectors are big users, but applications also are found in industries ranging from power generation and transmission to medical device manufacturing and the process industries. Bearing installation, pump and motor testing and process control are typical of the uses to which our torquemeters are put.

Digital bearingless torque sensors are available in three classes: 200 percent overload, 400 percent overload and dual range. These enable measurement of loads up to 4M lbf-in. Torque data is output using RS232/RS422/RS485 or, optionally, USB. Shunt calibration is bidirectional and combined nonlinearity and hysteresis is 0.03 percent.

Torque Measurement Specialists

S. Himmelstein and Company has specialized in building robust, high-precision torque measurement systems since 1960. We operate an in-house machine shop for full control over critical components and maintain a calibration laboratory certified to ISO 17025. Every torquemeter leaving our manufacturing facility in Hoffman Estates, Ill., is engineered for excellent performance at an affordable price and is backed by our exemplary after-sales support.

Find out how we can support your torque measurement application. Call, request a quote or complete the contact form.