In the darkroom for high-end optical inspection, in the dust-free workshop for semiconductor packaging, and at the high-precision testing station for photovoltaic research and development, even a deviation of 0.01 millimeters in displacement control could render a set of experimental data invalid and directly render a batch of precision components unusable. Many engineers and researchers specializing in precision have experienced such regrets: open-loop translation stages tend to lose steps when running fast, and ordinary semi-closed-loop products gradually lose accuracy over long-term operation. To achieve stable micrometer-level positioning, one often has to pay several times the cost of domestic equipment for imported procurement.
After 22 years of deep research in the field of precision optics, mechanics and electronics, Sevan Optoelectronics has presented its flagship product, the 7STA08B series of "God Cow" electric translation stages with full-closed-loop displacement control. Using the full-closed-loop scheme of direct measurement of position with a grating ruler, it integrates the "command immediately到位" accuracy throughout the process， completely breaking the industry's inertia that "high-precision displacement can only rely on imports"， and delivering a domestic answer that balances precision， heavy load and cost-effectiveness for rigorous scenarios in research and industry.
Full-closed-loop grating direct measurement， saying goodbye to step loss errors from the root
Traditional open-loop translation stages calculate positions based on motor steps. When encountering high-speed reciprocation or heavy-load impacts， they are prone to losing steps or losing synchronization， and the position deviation cannot be detected later. Ordinary semi-closed-loop schemes only add encoders at the motor end， unable to compensate for the backlash caused by wear of the screw and elastic deformation. After running for several thousand hours， the accuracy will gradually decline.
The 7STA08B series builds on the mature 7STA03B series platform， directly installing high-precision grating rulers on the tabletop， combined with Sevan's self-developed 7SC5 series motion controller， to construct a "real-time direct reading of the tabletop position - dynamic error compensation" full-closed-loop automatic control system. The positioning accuracy is stable at the micrometer level， with a repeat positioning accuracy of less than 0.005mm， and the resolution can reach up to 0.00125mm. Whether it is for uniform micro-stepping in spectral scanning or sub-micron alignment during fiber coupling， even after continuous operation for tens of thousands of hours， the grating ruler will directly feedback the real displacement of the tabletop， eliminating the potential problems of step loss and drift from traditional solutions， and truly achieving "where the command goes， the tabletop precisely stops there".
Hard-core structure as the foundation， smooth and seamless throughout 15kg heavy load
The stability of accuracy has always relied on a solid mechanical structure for support. The 7STA08B series uses imported precision ball screws， combined with a three-bearing installation structure and shaft end locking design， preventing screw loosening from the source. Even when running at high speed and reciprocating for a long time， there will be no problem of increasing transmission gap， and the overall service life of the equipment is significantly improved.
The guide rails use precision linear slider guide rails with pre-tightening anti-slip structure， ensuring smooth and seamless movement throughout the process， excellent linear performance， and a center load capacity of up to 15kg. It can stably carry heavy optical components such as optical lenses， integrating spheres， and spectrometer probes. It can independently complete high-precision displacement tasks with a single axis， or freely combine multiple axes to build a multi-dimensional displacement platform. The body is made of high-strength aluminum alloy， processed through aging treatment and precise grinding， with strong rigidity and good wear resistance. It does not deform during 7×24-hour continuous operation in the laboratory and can maintain stable accuracy during high-frequency operation on industrial production lines. The motor and screw are connected through imported elastic coupling， the transmission is completely synchronized， the operating noise is lower than 50dB， and it will not interfere with the environmental state of precise optical experiments， and can also be adapted to dust-free workshop scenarios with strict noise requirements.
Comprehensive consideration of details， dual integration of automation and operation convenience
Many engineers have had such an experience： After receiving a high-precision displacement stage， it takes a lot of time to debug interfaces， modify installation holes， and it takes a week to successfully connect to the existing system. The 7STA08B series was designed from the very beginning to balance both automation integration and operational convenience. It comes with a high-performance stepper motor and is equipped with a standard RS232 interface, which can seamlessly integrate with the Sefan 7SC5 series controller. It supports simultaneous operation of multiple devices, programming positioning, and the establishment of automated testing processes. Without the need for complex secondary development, it can quickly integrate into existing experiments and production lines.
Both ends are equipped with zero position and limit switches, supporting one-click rapid zero return. At the same time, it comes with over-travel protection, balancing positioning efficiency and equipment safety. Even novice operators won't worry about damaging the equipment due to collisions. The surface and base are evenly distributed with standard hole spacing installation holes, which can be directly fixed on the optical platform or flexibly combined with other displacement tables to quickly build multi-dimensional adjustment frames, meeting the requirements of complex optical paths and equipment integration. For scenarios with high-speed operation needs, the 7STA08B series can also be customized and upgraded with servo motors to further enhance operational efficiency.
The 7STA08B series with a full travel range of 50mm to 300mm covers almost all scenarios with strict requirements for positioning accuracy. As the flagship series of domestic precision displacement tables, its core components are all self-developed, with performance comparable to international high-end products. The overall cost performance has been improved by 40%, and it is also equipped with a 4-hour rapid response after-sales service and a 3-year core component warranty, significantly reducing the long-term usage costs for users.
Closed-loop control precision, heavy-load stable travel; craftsmanship builds quality, accuracy lays the foundation. The Sefan Optoelectronics 7STA08B series electric translational stage uses the core strength of full closed-loop grating feedback, breaking the import dependence of precision displacement, providing reliable displacement support for scientific research innovation and industrial precision manufacturing, helping users break through technical boundaries and truly achieve efficient and precise displacement freedom.
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