Renishaw’s new REXM high accuracy angle encoder offers the ultimate angular metrology…
June 2007
![REXM high accuracy ring](/media/img/gen/295f6862b6484331839908f4b0fba372.jpg)
For applications that require the highest angular accuracy, the REXM angle encoder offers new levels of angular metrology - better than ±1 arc second total installed accuracy, zero coupling losses and exceptional repeatability.
Like the RESM, the REXM stainless steel ring has graduations marked directly onto the periphery. However, it features a thicker cross-section designed to minimise all installation errors except eccentricity.
The remaining eccentricity is easily corrected using the combined output of two readheads. Renishaw's new DSi (Dual SiGNUM™ Interface) blends the output of two readheads whilst providing a repeatable and customer programmable reference mark propoZ™ position. Once the DSi has eliminated eccentricity, the only other errors remaining are graduation and cyclic error (sub-divisional error - SDE) both of which are exceedingly small.
When REXM is used with the DSi, it is possible to achieve a total installed accuracy of better than ±1 arc second. Tests on a 183mm REXM ring have achieved an impressive total installed accuracy of ±0.22 arc seconds.
Furthermore, REXM maintains the dynamic performance advantages of SIGNUM™ encoders. As a non-contact system, REXM rings are directly locked to the rotor, eliminating coupling losses, oscillation, shaft torsion and other hysteresis errors that plague enclosed encoders.
The total installed accuracy of a typical REXM system is ±0.22 arc second, determined by analysis of sequentially rotated installations.
Full article
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新闻稿: 新闻文章 — DSi双SiGNUM™接口 — 实现优于±1秒的整体安装精度! [zh]
采用Renishaw的新型DSi接口,可在一个RESM圆环上安装两个SiGNUM™ SR读数头,输出一个具有高重复性的propoZ™参考位置的信号,完全不受轴承偏移或动力循环的影响。
[318kB]
Editor downloads
- REXM - all files [321kB]
- News release: REXM [26kB]
Images
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REXM高精度圆光栅 [gen] [96kB]
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SiGNUM™ REXM accuracy plot
SiGNUM™ REXM accuracy plot
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