January 2011
Electrical switching & drive systems & components
A new offering from maxon motor is the EC 22 HD, a heavy duty motor for extremely harsh operating conditions.
Developed for the exceptionally demanding requirements of deep drilling technology, the electronically commutated EC 22 HD can withstand extreme environments.
Deep drilling (or downhole drilling) permits exploration of oil and gas resources at depths beyond 2500 meters. In conjunction with directional drilling (the dynamic orientation of a borehole), the EC 22 HD allows exploration of deposits at depths of 5000 metres with bore lengths of up to 11 000 metres.
The temperature and pressure conditions present in this depth range, in conjunction with vibrations emitted by the drilling process, make the employment of electric drives a real challenge. However current electronic and drive technologies permit sophisticated monitoring and control in a multitude of functions. For instance the position and orientation of the drilling head in the deep drilling tools can be dynamically measured and adjusted, while hydraulic valves and flaps are operated by electromechanic drives.
The different variants of the EC 22 HD are designed for operation in air or hydraulic fluid. Their assigned power rating depends on the surrounding medium, but, due to remarkably higher heat dissipation, averages 80 W in air and 240 W in oil. The motors are designed to cope with ambient temperatures of more than 200°C and atmospheric pressures of up to 1700 bar. The 22 mm diameter motors can withstand vibration of up to 25 grms as well as impulse and impact of up to 100 G; this is 100 times gravitational acceleration. In comparison a Formula 1 car encounters about 2 G and a fighter jet about 13 G. The motors feature efficiencies up to 88% in air and 70% in oil and are thus well suited for battery-operated applications. With their detent-free running characteristics, they possess outstanding regulation behaviour and are especially suitable for high precision positioning tasks, even at low speed.
The motor has application in outer space, power plants, vehicle manufacturing, the aircraft industry, mining, and other highly dynamic environments.
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