A rotary variable displacement transducer, also called a rotary variable differential transformer is an electromechanical transducer which delivers an adjustable alternating current (AC) output voltage that is directly proportionate to the angular movement of its input shaft. The output signal is linear within a quantified range over the angular movement, when energized with a fixed AC source. The basic rotary variable displacement transducer comprises of two secondary windings and a single primary winding. The electromotive force induced in the secondary winding is a function of rotary displacement. The two secondary windings are positioned in such a fashion that they produce electromotive force that is 180 degree out of phase from one another. Thus, when the shaft is at null position, the electromotive force induced in two secondary windings are opposite in phase and equal to each other. Therefore, the differential output potential is zero. Similarly, when the shaft moves in clockwise or anti-clockwise direction, differential output potential is positive or negative respectively.
The rotary variable displacement transducer provides high performance and consistency owing to its rugged and compact construction. It utilizes non-contacting, brushless technology that results in reliable operation, long life and, repeatable position sensing with finest resolution. Such repeatable and reliable operation reassures precise position sensing even under the most extreme operating situations. It has low output impedance, typically on the order of 100 ?, therefore signal amplification is not required. Moreover, owing to its non-contact nature, magnetic hysteresis and mechanical backlash is negligible. Furthermore, it is resistant to shocks and vibrations and therefore ensures performance stability over a wide range of environmental conditions. Therefore, its demand is rapidly increasing in industrial automation as well as automobiles and aircrafts. This is expected to be the major growth driver of rotary variable displacement transducer across the world.
Sensitivity to stray magnetic fields is the only factor affecting the rotary variable displacement transducer market. However, proper shielding can reduce the impact of this limitation across several end-use applications.
Opportunity anticipated to boost the rotary variable differential transducer market is its increasing integration in flight-critical command and feedback applications such as cockpit controls, flight control actuation and navigation, control-surface feedback, thrust reverser and power level angle, etc. Factors such as high reliability, accuracy, sturdiness, no frictional resistance, and low sensitivity to temperature and frequency variations are expected to make it the most preferred alternative in aerospace applications.
The rotary variable displacement transducer market can be classified on the basis of type, number of channels, application, end-use industry, and geography. Based on type, the rotary variable displacement transducer market can be segmented into optical, magnetic, mechanical, and capacitive rotary variable displacement transducer. Based on number of channels, the rotary variable displacement transducer market can be segmented into single channel and multi-channel. In terms of application, the rotary variable displacement transducer market can be bifurcated into test equipment, material handling, machine tools, motion systems, robotics, and others. Based on end-use industry, the rotary variable displacement transducer market can be segmented into aerospace and defense, automotive, electronics, power, healthcare, construction, and others. Based on geography, the rotary variable displacement transducer market can be segmented into North America, Europe, Asia Pacific (APAC), Middle East & Africa (MEA), and South America. Asia Pacific is expected to be the most attractive region for the rotary variable displacement transducer market owing to rapidly expanding end-user industrial base in developing nations such as China and India in this region.
Prominent players operating in the rotary variable displacement transducer market include TE Connectivity Ltd., Woodward Incorporation, Zettlex UK Ltd., Honeywell International Inc., Kearfott Corporation, AMS AG, Curtiss-Wright Industrial Group, Sentech Inc., Ectron Corporation, and Moog Incorporation among others.
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