Brushless servomotor eliminates the need for a separate encoder cable

Brushless servomotor eliminates the need for a separate encoder cable

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By eeNews Europe

An innovative embedded digital interface scheme allows the encoder power and position feedback data – together with diagnostic information and thermal data from the motor’s temperature sensor – to be carried on just two shielded wires contained within the motor’s power cable. NUM estimates that for a typical high-end CNC machine installation involving 20 metre cable lengths, the new technology can reduce total motor cabling costs by as much as 20 percent per axis. Available in 75, 95, 126 and 155 mm frame sizes and three different lengths, the new SHX and SPX brushless servomotors offer machine builders a wide choice of output power and speed ratings to match different machinery applications.

Both motor ranges feature high mass moments of rotor inertia, optimized for machine tool feed axes, and combine excellent dynamic performance with very smooth running, even at low speeds. The SHX range is intended mainly for cost-sensitive applications and includes models with continuous torque outputs from 1.2 to 20 Nm. For applications demanding motors with maximum power-to-volume ratios and a high degree of protection (IP67), such as high-end machine tools, grinding machines and robotics, the SPX range offers units with continuous torque ratings from 1.4 to 23 Nm.
All SHX and SPX brushless servomotors offer a choice of single- or multi-turn digital encoders with medium, 20-bit (1,048,576 positions per turn) resolution and plus/minus 60 arcseconds accuracy. Backed by the precision control capabilities of NUM’s new Flexium+ CNC kernel, this level of encoder performance facilitates very smooth interpolated move profiles and fine adjustment of speed. Both encoders are also available in safety versions, which return position and redundant position data to the servodrive using a secure certified protocol, and comply with the EN 61800-5-2 functional safety standard to SIL 2. NUM is also currently developing a range of high resolution 23-bit digital encoders featuring an accuracy of better than plus/minus 45 arcseconds, for applications demanding ultra precise positioning.

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