In the field of Concentrated Solar Power (CSP), Parabolic Trough Collector (PTC) technology is one of the most widely used, and Dunkermotor's new ‘Bifurcated Wormetary’ gearmotors are designed to meet that application's requirements, while offering several unique benefits.
Both CSP and PTC power plants require highly accurate and reliable tracking systems. Low energy consumption and flexibility in operating speed are required to provide efficient and effective tracking.
Dunkermotor, now part of Ametek Precision Motion Control, has further refined its unique Wormetary gearing to provide dual high-torque outputs from a single, efficient gearmotor. The motor itself is a special long-life brush motor design with 60 volt input and rated for 28.5 N-cm (40.4 oz-in) continuous torque. It features IP65 environmental protection along with a unique condensation prevention membrane to further prolong life. For the CSP application, the Wormetary gearing is non-backdrivable, which is a benefit in the presence of wind loading. With planetary gearing in its output stages, the load is spread over many contact points around each gear, thus offering much greater protection from shock loading than helical gears used in other high efficiency right angle gearmotors.
Wormetary gearing offers the high-reduction ratios needed for Parabolic Trough Collectors' low-speed operation. Their dual output shaft configuration is ideally suited for this type of CSP application. It also lends itself well to certain Linear Fresnel Collector applications where it can replace special slew drives
The Bifurcated Wormetary gearing combines a right angle worm gear to turn the corner with a pair of efficient planetary gearboxes for a total reduction ratio of 529:1, without an undue sacrifice in efficiency. Overall reductions up to 50,000:1 can be achieved with the Wormetary configuration. The gearboxes share the load through beefy 25mm output shafts and each side is rated for a continuous output torque of 160 N-m (1,416 in-lbs) and peak outputs of 320 N-m (2,832 in-lbs). One benefit of the Wormetary configuration, compared to worm gearing alone, is that at an overall ratio of 80:1 the new configuration is 2.5 times more energy efficient.