(WarpAstron) released China's first equatorial instrument with servo motor direct drive - WARPSPEEDDriveWD-17S (with RA axis electromagnetic brake) in December 2022. WD-17S relies on servo direct drive technology to achieve an average The WD-17S achieves an average guiding accuracy of 0.3~05" RMS with only 3.8kg of full equatorial weight (supporting Losmandy wide and Vixen narrow orbits).
WD-17S adopts harmonics of type 17 and 14 as reducers for RA and DEC axes respectively. The cylindrical body structure achieves a compact arrangement of servo motor direct drive structure, while the wall thickness of up to 1cm ensures the high strength of the overall structure. With the high torque input from the servo motor, the WD-17S can run a load of 15kg (without counterweight) at a distance of 25cm from the right ascension axis.
WD-17S adopts servo motor direct drive method, which has higher transmission efficiency compared with harmonic equatorial instrument using synchronous belt or planetary wheel assisted reduction mechanism.
The high response speed advantage brought by the servo motor solves the difficulty that the harmonic equatorial instrument is plagued by the period error. Whether the harmonic reducer itself has a period error of 10 arc seconds or up to 30 arc seconds or more, the servo direct drive technology ensures the same excellent guiding accuracy.
Extension column: $100