Frameless, Brushless Motors are available in 14 sizes.

Press Release Summary:

Suited for 240 or 480 Vac operation, RoHS compliant KBM(TM) series motors come in standard frame sizes from 60-825 mm dia and deliver speeds from 105-18,600 rpm. Each frame size is available with up to 3 or 4 stack lengths. UL listed, CE marked units feature fully encapsulated stator windings and internal windings rated for continuous duty operation up to 155°C. Rare-earth neodymium iron boron magnets provide continuous torque from 1.07-2,540 lb-ft and peak torque from 3.62-9,450 lb-ft.

Original Press Release:

Kollmorgen KBM(TM) Series Frameless Brushless Motors Deliver High Performance for Tightly Integrated Motion Applications

Inherent features and resulting performance attributes, plus frameless design, deliver precise fit and performance in applications that demand a flexible, highly optimized motion solution

RADFORD, VA, - Kollmorgen introduces KBM(TM) Series Frameless Brushless Motors - a new family of frameless motors derived from the proven and extensive portfolio of Kollmorgen designs. Available in 14 sizes for low or high voltage operation, KBM frameless brushless motors deliver the torque, power and speed, within a cost-effective package and compact footprint, that give the system designer serious flexibility in specifying a motor that fits the specific performance and dimensional requirements of the application, without incurring expensive engineering or other capital fees.

"Kollmorgen engineers are adept at leveraging existing design successes to develop new motors with superior value, enabling our customers to gain a competitive advantage through faster time to market and minimized investment. KBM motors were born of those efforts," says Bryan Bird, Product Manager, Kollmorgen, North America. "OEMs tasked with designing a highly optimized and tightly integrated machine or device will find KBM motors to be an excellent choice due to their unique design which inherently improves mechanical compliance, reduces parts count, and improves performance through the use of powerful direct-coupled electro-magnetics with a light weight and compact form factor."

KBM frameless brushless motors are available in standard frame sizes ranging from 60mm to 825mm in diameter, and for 240 VAC or 480 VAC operation. Upon customer request, additional motor windings can be offered to allow optimized performance at lower voltages such as 12 or 24 VDC. Each frame size is available with up to 3 or 4 stack lengths. They feature fully encapsulated stator windings for superior thermal and environmental performance. Internal windings are rated for continuous duty operation up to 155°C (311°F), enabling highly reliable performance even under extreme duty and temperature conditions. Rare-earth neodymium Iron Boron magnets provide high continuous torque ranging from 1.45 N-m (1.07 lb-ft) up to 3445 N-m (2540 lb-ft), and peak torque ranging from 4.91 N-m (3.62 lb-ft) up to 12,812 N-m (9450 lb-ft), for maximum power ranging from 550 W (1.22 HP) up to 18.5 KW (24.8 HP) within the smallest motor package. They boast maximum available speeds at rated power from 105 RPM up to 18,600 RPM.

Additionally, rotor hub dimensions can be customized within certain constraints, enabling machine builders to tailor the KBM to their unique physical requirements. Rotor magnets are protected by metal retaining bands to enable fail-safe motor operation. Lastly, integral PTC thermistor (avalanche-type) overload protection meets UL / CE agency compliance guidelines.

KBM frameless brushless motors are RoHS compliant. While frameless part set motors cannot be labeled or agency approved as components, the KBM series has been designed to UL and CE guidelines in order to more easily facilitate certification in the customer's higher-level assembly.

KBM frameless brushless motors can be combined with Kollmorgen's AKD(TM) Servo Drives for a complete, fully optimized motion solution.

Their design and performance attributes make KBM frameless brushless motors an attractive option in any number of medical, metal processing and cutting, aerospace and defense, and oil and gas equipment applications that demand a highly optimized and tightly integrated motion solution. They are also well suited for use in semiconductor and electronic assembly, renewable energy and vehicle electrification applications.


Kollmorgen is a leading provider of motion systems and components for machine builders around the globe, with over 60 years of motion control design and application expertise.

Through world-class knowledge in motion, industry-leading quality and deep expertise in linking and integrating standard and custom products, Kollmorgen delivers breakthrough solutions unmatched in performance, reliability and ease-of-use, giving machine builders an irrefutable marketplace advantage.

For more information download the KBM Frameless Motor Selection Guide and KBM interactive 3D models, or visit, email or call 1-540-633-3545.

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