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Frameless brushless servo motors

23 January 2012

Inmoco has extended its precision servo motor range with the introduction of the Kollmorgen KBM Series of frameless brushless servo motors. The frameless design provides a cost-effective, compact method of achieving positional accuracy in a smaller, more reliable motor package. It gives system designers the flexibility to specify a motor that fits the specific performance and dimensional requirements of the application, without incurring expensive engineering costs.

Derived from the proven and extensive portfolio of Kollmorgen servo motor designs, the KBM brushless series delivers optimised torque, power and speed within a cost-effective package and compact footprint. A wide range encompasses 14 frame sizes, from 60mm to 825mm in diameter, for 240Vac or 480Vac operation. In addition, to meet specific customer requirements, additional motor windings can be provided to allow optimised performance at lower voltages, typically 12Vdc or 24Vdc.

Each frame size of the KBM series is available with up to 3 or 4 stack lengths, and the motors feature fully encapsulated stator windings for superior thermal and environmental performance. Internal windings are rated for continuous duty operation up to 155 degrees C, enabling highly reliable performance even under extreme duty and temperature conditions.

Key to the excellent torque performance of the KBM motors are rare-earth high-performance magnets. These provide high continuous torque ranging from 1.45 N-m to 3445 N-m, peak torque from 4.91 N-m to 12,812 N-m, across the power range from 550W to 18.5KW and speed range from 105rpm up to 18,600rpm.

The flexibility of the KBM series for OEM use is extended by a feature enabling the rotor hub dimensions of the motors to be customised within certain constraints, enabling machine builders to tailor the KBM to their specific physical requirements. In these and the standard motors, the rotor magnets are protected by metal retaining bands to enable fail-safe motor operation.

Further operational safeguarding is provided by integral PTC thermistor (avalanche-type) overload protection, which meets UL/CE agency compliance guidelines.

The KBM frameless brushless motors provide an ideal combination with Kollmorgen’s AKDTM Servo Drives. RoHS compliant, they have also been designed to UL and CE guidelines.

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