Parker has enhanced the design of its popular high speed frameless servomotor series, SKW. Suitable for single- and multi-spindle machine tool applications up to 21 kW, the motor neatly deploys inside the spindle. Supplied in kit form, it simplifies mechanical design of the machine.
Among the many advantages over induction motors, the revised SKW range features the use of cold PMAC permanent magnet AC (PMAC) technology. This means reduced heating in the bearings – so low dilation effect. In addition, an increased internal diameter means greater rigidity and capacity for bar stock handling in automatic (sliding head) lathes.
Despite the increase in internal diameter, the overall dimensions remain extremely compact. Multi-spindle machine tools in particular need motors with a small external diameter and a large hollow shaft for the bar or the tools, thus delivering greater productivity. For this reason, the SKW series has been designed as a tubular motor, resulting in numerous advantages. Not only does it mean a dedicated speed for each spindle, but better surface finish, shorter cycle time and longer tool life. These synchronous motors are also oil proof and maintenance-free (direct drive), with low noise levels, and are compatible with third-party drives including Fanuc and Siemens.
SKW motors deliver high efficiency (90-95%) and are liquid cooled to optimise performance. Offering a speed range up to 12 000 rpm, the motors come in four sizes. Choices include constant power from 3 to 28 kW and low speed torque from 4 to 37 Nm, with specific speed/torque requirements available on request.
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