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This content was submitted directly to this Web site by the supplier.Article | May 2, 2013
Heidenhain Corp.: Encoders
HEIDENHAIN's product range of absolute rotary encoders of the 400 Series are now available with interface to Fanuc controls.
These encoders are particularly suitable for use on servo axes and spindles in machine tools, and feature integral bearings and stator or separate shaft couplings. Designed specifically for direct connection to Fanuc controls with α and αi interfaces, these new 400 Series encoders are already established with SSI or EnDat interfaces as other options. Of HEIDENHAIN's 400 series, the ECN/EQN 400 rotary encoders with stator couplings are available with a blind-hollow or hollow through-shaft. The stator coupling compensates radial runout and alignment errors without significantly reducing the accuracy. The encoder shaft is directly connected with the shaft to be measured. During angular acceleration of the shaft, the stator coupling must absorb only that torque caused by friction in the bearing. The ROC/ROQ 400F rotary encoders with separate shaft coupling are available with a synchro flange or clamping flange, and have integral bearings and a solid shaft. The shaft coupling compensates axial motion and misalignment (radial and angular offset) between the encoder shaft and measured shaft. This relieves the encoder bearing of additional external loads that would otherwise shorten its service life. Diaphragm and metal bellows couplings designed to connect the rotor of the ROC/ROQ 400F encoders are available.The singleturn encoder versions of the 400 Series have a revolution counter that saves the number of revolutions during operation. After power is switched off, the counter is reset to zero. The multiturn versions feature an integral gear box, which keeps track of revolutions and is not affected by power loss. That absolute position is available immediately upon switch-on. All HEIDENHAIN's 400 Series encoders are mounted with IP 67 protection on the housing and IP 64 at the shaft inlet.
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