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Motor suits direct drive submarine winch

Motor suits direct drive submarine winch
Heason Technology has worked in partnership with USA motion specialists Allied Motion to deliver 700 mm diameter brushless and frameless torque motors for UK defence manufacturer QinetiQ as an integral part of its Towed Array Handling System (TAHS). With a separate rotor and stator design delivering a continuous stall torque of almost 7 kNm and maximum torque approaching 24 kNm, the custom built Megaflux series motor directly drives a large winch used to deploy sonar array systems equipment on submarines.

QinetiQ's Winfrith based Underwater Systems business has successfully developed an electrical drive solution for TAHS over traditional hydraulic drives to maintain improved control, high reliability, flexibility in installation, and reduced through-life cost. TAHS has been designed to fulfil the needs of many of the world's navies for compact, robust and effective solutions that minimise impact on other onboard systems, as space on any submarine is always at a premium. 

Megaflux series thin ring brushless servo motors are designed for direct-drive applications where smooth and precise control of large inertia or high torque loads is of prime importance. The design features minimal cogging torque and is characterised by a space-saving form factor with a large diameter-to-length ratio that allows the motor to be directly integrated on the driven shaft, eliminating the problems of torsional resonance due to flexible couplings and backlash associated with gear driven systems.

The customisation for the TAHS application involved increasing the stator and rotor length to a nominal 150 mm to gain an increased torque density. The motor characteristics were also modified to maintain voltage, torque and other critical mechanical and winding constants that best matched QinetiQ's servo drive specification.

The large through-hole in the Megaflux design also helped the customer to maintain a compact design, accommodating electrical cabling and other services such as slip ring assemblies within the space restricted application.

The standard Megaflux range covers eight frame sizes and over forty models with diameter-to-length ratios from 150 mm x 30 mm to 760 mm x 123 mm, covering continuous stall torque from just 3 Nm to over 2000 Nm.

The Megaflux thin-ring motor range is available from Heason as a separate component or can be supplied as a part of a complete system with commutation and positioning encoders, servo drives and motion controls. The motor is also available in a fully housed version and, through Heason's motion systems design service, can also be assembled on customer supplied components or built into complete positioning actuator solutions.

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