2nd Quarter 2013Electrical switching & drive systems & components
Maxon’s new, electronically commutated EC-4pole 32 HD motor has all the features of the award-winning EC 22 HD 22 mm heavy duty motor. This larger, more powerful version is designed for extremely rough operating conditions, particularly applications in deep drilling. This 480 W motor can withstand temperatures of 200°C, pressures of 1700 bar and impacts up to 1000 G, all at a depth of 5000 metres.
Deep drilling technology makes it possible to recover oil and gas from depths of more than 2500 metres. By combining deep drilling with directional drilling (dynamic position alignment of a bore in the earth), previously unreachable oil reserves are being opened up, with drilling depths of 5000 metres and drill lengths of up to 11000 metres. The development of specialised electronics and drives has made it possible to better monitor and control many functions across the entire drilling process. For instance, it is now possible to measure and adjust the position of the drill head dynamically during the drilling process. Diverse deep drilling tools also use hydraulic valves or flaps that are operated by electromechanical drives. The temperatures and pressures at these depths, combined with the strong vibrations that occur during the drilling work, present unique challenges for the use of electronic drives.
Maxon’s EC-4pole 32 HD motors are designed for operation in air or in oil (flooded in hydraulic oil). The power rating depends on the surrounding medium and amounts to 220 W in air and, due to the much higher heat flow, 480 W in oil. They are designed for ambient temperatures of more than 200°C and atmospheric pressures up to 1700 bar. The ø 32 mm motors must also be able to withstand vibrations of up to 25 Grms as well as impacts of up to 1000 G. In comparison, a Formula 1 vehicle is exposed to approximately 2 G and fighter jets are exposed to approximately 13 G. The motors feature high efficiency (up to 89% in air and more than 80% in oil), making them ideal for use in battery-operated applications. With their detent-free running properties, they have excellent control characteristics and are suitable for high precision positioning tasks in outer space, even at low speeds.
The EC-4pole 32 HD is ideal for use in environments with extreme temperatures, subject to high vibration, or under ultra-high vacuum. This means the motors can also be used in aerospace applications, for example for gas turbine starters, for the generators of jet engines, for regulating combustion engines, or for exploration robots.
For the use of the motor in conjunction with a gearhead, maxon offers the GP 32 HD, a powerful and robust planetary gearhead.
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