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Frameless brushless motors offer advantages for machine automation

Frameless brushless motors offer advantages for machine automation

For many OEM and specialised motion control applications, integrating frameless servo motors directly into the machine design can provide numerous advantages. Kollmorgen’s KBM series frameless brushless motors – available with full support from its UK certified partner Heason Technology - comprise of separate rotor and stator components offering a direct-drive servo system that has a minimum installed footprint, superior mechanical stiffness with zero backlash and maximum torque density.

With the potential to use the machine’s own bearings to support the rotor and reducing the need for a motor housing and shaft assembly, the compact direct-drive solution reduces the machine’s overall size and weight, operational noise and required maintenance through the elimination of gearboxes, belts or pulleys. For the KBM series, the combination of low compliance mechanics, extremely smooth rotation with minimal cogging and a very wide operating speed range with rapid acceleration provides a more responsive system performance that perfectly suits high precision motion.

Kollmorgen’s highly developed KBM series is based on powerful direct-coupled rare-earth neodymium iron boron rotor magnets protected with fail-safe bands and fully encapsulated stator windings. A continuous 155°C internal winding temperature capability and the motor’s dynamic start-stop performance achieves high precision positioning whilst maximising machine throughput. The KBM series covers 14 frame sizes for 240V AC or 480V AC operation, ranging from 60 to 825mm stator diameter with each frame size available with up to three or four stack lengths. Commutation is taken care of through standard or optional latching digital Hall Effect sensors and an integral PTC thermistor provides therm-al overload protection.

Maximum continuous torque ranges from 1.45 to 3445Nm, while maximum power output ranges from 550W to 18.5kW with rated speeds of 105 rpm to 18,600 rpm.

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