Kollmorgen

Kollmorgen contact details

Kollmorgen Corporation

203A West Rock Road
Radford, VA 24141
United States

Telephone +1 833 565 5667

Website kollmorgen.com

Kollmorgen Europe GmbH

Pempelfurtstraße 1
40880 Ratingen
Germany

Telephone +49 2102 9394 0

Web kollmorgen.com/en-us/company/worldwide-locations

Kollmorgen s.r.o.

Evropská 864
664 42 Modřice, Brno
Czech Republic

Telephone +420 533 314 111

Web kollmorgen.com/en-us/company/worldwide-locations

Kollmorgen srl

Via per Cinisello 95/97
20834 Nova Milanese (MB)
Italy

Telephone +39 0362 594260

Web kollmorgen.com/en-us/company/worldwide-locations

Show Kollmorgen headquarters on the map Open in Google Maps →

Contact details as published by Regal Rexnord Corporation, checked 2026-10-30. Specify Motion is not affiliated with Regal Rexnord Corporation.

Kollmorgen product lines

Who Kollmorgen is

Kollmorgen is a US manufacturer of motion control components: servo motors, frameless and direct-drive motors, linear motors, servo drives and machine controllers. Engineers know it best for the AKM servo motor and AKD servo drive families and for its frameless motor kits, which are built straight into robot joints, gimbals and other embedded axes. Kollmorgen is a brand of Regal Rexnord Corporation, and the product names used here are trademarks of their owner.

History and ownership

The company began with optics. Dr. Friedrich Kollmorgen patented a two-telescope design in 1911, and the company was incorporated in New York on 22 March 1916. Its own history describes it becoming the leading designer and maker of submarine periscopes for the US Navy.

The motor business came from Inland Motor, which Hugo Unruh started in 1948. Unruh designed frameless torquers for the gimbal drives of early inertial guidance systems, and these became Inland’s fastest-growing product. Inland merged with Kollmorgen Optical in 1960, which is the root of Kollmorgen’s long association with frameless and direct-drive motors.

Ownership has changed several times since. On 1 October 2018 Kollmorgen joined Altra Industrial Motion Corp., together with Thomson, Portescap and Jacobs Vehicle Systems, in a combination with four operating companies from Fortive’s Automation & Specialty platform. On 27 March 2023 Regal Rexnord Corporation, of Beloit, Wisconsin, completed its acquisition of Altra. Kollmorgen now operates as a Regal Rexnord brand, and Regal Rexnord is listed on the New York Stock Exchange as RRX.

Product portfolio

Servo motors

The AKM is the long-running brushless servo motor range, in eight frame sizes from 40 mm to 260 mm, with a wide choice of feedback devices and washdown and food-grade options. The AKM2G is the second generation, giving more torque per frame in six IEC flange sizes, with low-voltage windings and single-cable digital feedback.

Frameless and direct-drive motors

KBM and KBMS frameless kits supply a rotor and stator for building the motor directly into the machine, with large through-bores. The TBM2G range is a compact low-voltage frameless kit sized for collaborative robot joints, in seven diameters. The Cartridge DDR is a housed direct-drive rotary motor without its own bearings that mounts like a conventional motor. Linear axes are served by IC/ICD iron-core linear motors for high force and IL ironless linear motors for zero-cogging scanning. Our frameless torque motor hub and frameless motor sizing guide explain how to specify these.

Drives and controllers

The AKD single-axis servo drive covers 120/240 V and 240/480 V supplies with broad feedback compatibility and a choice of industrial Ethernet and CAN fieldbuses. The AKD2G adds dual-axis versions, on-board functional safety, a graphical display and SD-card backup. Machine control is handled by the PCMM2G EtherCAT controller, programmed through Kollmorgen Automation Suite, which succeeds the first-generation PCMM, now closed to new applications.

Discontinued products

Kollmorgen lists the EC Series electric cylinders and the N2 Series among its discontinued products, which matters for anyone maintaining machines built with them.

Technologies and standards

Kollmorgen’s motors are designed to work across many feedback types, and the AKD family is known for accepting a wide range of encoders and resolvers. Its controllers use EtherCAT as the motion network and support IEC 61131-3 programming with PLCopen motion blocks. Frameless motors are a particular strength: designing the motor into the axis removes the coupling and housing, saving length and weight, but the machine builder then takes on bearing, feedback and thermal design.

Industries served

The history explains the brand’s footing in defence and aerospace, from periscopes to gimbal torquers. Today its frameless kits target robot joints and other embedded axes, and its servo motors and drives are used across general machine building, including food-grade applications that need washdown motors.

Global and UK presence

Kollmorgen’s worldwide locations page lists Kollmorgen Corporation in Radford, Virginia, and European companies in Ratingen (Germany), Brno (Czech Republic) and Nova Milanese (Italy), together with Kollmorgen Automation AB in Mölndal, Sweden, for AGV controls. It lists sites in China, Japan, South Korea, India and Brazil. No UK office is listed, so UK engineers normally deal with the European office in Ratingen.

What to have ready for a Kollmorgen enquiry

Quote the full model number from the motor or drive label, since AKM and AKM2G part numbers encode frame, stack, winding, feedback, brake and connector options. For frameless kits, give the kit part number and the housing, bearing and encoder arrangement it sits in. For drives, note the supply voltage, fieldbus, feedback type and any safety wiring. On discontinued EC or N2 cylinders, add stroke, lead, motor mount and the load being moved.

Sourcing Kollmorgen parts through Specify Motion

Specify Motion is independent of Kollmorgen and Regal Rexnord and is not affiliated with either. We can help source Kollmorgen parts, including discontinued series, or propose motors, frameless kits and drives from our supply network that meet the same published figures. See the Kollmorgen alternatives page or send a part number through find a replacement.

Kollmorgen history: key dates

1. 1911Dr. Friedrich Kollmorgen patents a two-telescope design
2. 1916Company incorporated in New York on 22 March
3. 1948Hugo Unruh's Inland Motor begins operations
4. 1960Inland Motor merges with Kollmorgen Optical
5. 2018Kollmorgen joins Altra Industrial Motion on 1 October with Thomson, Portescap and Jacobs Vehicle Systems, from Fortive's Automation & Specialty platform
6. 2023Regal Rexnord completes its acquisition of Altra Industrial Motion on 27 March
7. 2023AKD2G servo drive range expanded
8. 2024PCMM2G next-generation controller announced

Kollmorgen servo motors

AC servo motor

AKM

Kollmorgen's long-running brushless AC servo motor range, spanning eight frame sizes from tiny 40 mm units to 260 mm high-torque motors, with a wide menu of feedback devices and washdown/food-grade options.

AC servo motor

AKM2G

Second-generation AKM servo motor offering more torque per frame than the original AKM, in six IEC flange sizes, with standard and low-voltage windings and single-cable digital feedback options.

Kollmorgen direct-drive and torque motors

Frameless torque motor

KBM / KBMS

Frameless brushless rotor-and-stator kits for building the motor directly into a machine axis, with large through-bores and optional factory-fitted Hall sensors (KBMS).

Frameless torque motor

TBM2G

Compact low-voltage frameless motor kits sized for collaborative robot joints and other embedded axes, in seven diameters with three stack lengths each.

Housed direct-drive motor

Cartridge DDR

Direct-drive rotary motor supplied in a housing but without its own bearings: it uses the machine's bearings and mounts on a pilot and bolt circle like a conventional motor, coupling to the load with a compression coupling.

Kollmorgen servo drives

AC servo drive

AKD

Single-axis servo drive family covering 120/240 V and 240/480 V supplies, with broad feedback compatibility and a choice of industrial Ethernet and CAN fieldbuses.

Multi-axis servo drive

AKD2G

Second-generation AKD offered in single- and dual-axis versions, adding on-board functional safety, a graphical display and SD-card backup, aimed at single-cable motor connection with AKM2G.

Kollmorgen linear motors

Iron-core linear motor

IC / ICD Ironcore DDL

Iron-core direct-drive linear motors with natural or water cooling, built from coil assemblies and modular magnet ways for long-stroke, high-force axes.

Ironless linear motor

IL Ironless DDL

Ironless (coreless) U-channel linear motors with zero cogging and no attraction force, for smooth, precise scanning and positioning.

Kollmorgen linear actuators

Rod actuator · discontinued

EC Series electric cylinders (EC1-EC5)

Rod-style ball/lead-screw electric cylinders in five sizes that Kollmorgen now lists among its discontinued products.

Rod actuator · discontinued

N2 Series electric cylinders

Compact rod-type electric cylinder line that Kollmorgen lists as discontinued.

Kollmorgen controllers, plcs and hmis

Motion controller

PCMM2G

Quad-core EtherCAT motion and machine controller programmed through Kollmorgen Automation Suite, with an 8-axis 'Essentials' version for simpler machines.

Motion controller · legacy

PCMM

First-generation EtherCAT multi-axis master controller supporting all five IEC 61131-3 languages plus PLCopen motion, now closed to new applications.

Frequently asked questions

What is the Kollmorgen website?

The official website is kollmorgen.com. It carries the product catalogue (servo motors, direct-drive and frameless motors, servo drives and controllers), a list of discontinued products, the company history and a worldwide locations page with addresses and telephone numbers for each regional office.

What is the Kollmorgen phone number?

Kollmorgen Corporation in Radford, Virginia, lists 1-833-565-5667 (+1 833 565 5667). For Europe, Kollmorgen Europe GmbH in Ratingen, Germany, lists +49 2102 9394 0, and the Czech office in Brno lists +420 533 314 111. The locations page publishes no general email addresses.

Who owns Kollmorgen?

Kollmorgen is a brand of Regal Rexnord Corporation, the NYSE-listed group (RRX) based in Beloit, Wisconsin. Kollmorgen joined Altra Industrial Motion in October 2018, coming from Fortive's Automation & Specialty platform, and Regal Rexnord completed its acquisition of Altra on 27 March 2023.

Where is Kollmorgen's headquarters?

Kollmorgen's worldwide locations page lists Kollmorgen Corporation at 203A West Rock Road, Radford, VA 24141, USA, as its North American site. Its parent, Regal Rexnord, is headquartered in Beloit, Wisconsin. In Europe, the main company is Kollmorgen Europe GmbH in Ratingen, Germany.

Does Kollmorgen have a UK office?

Kollmorgen's worldwide locations page lists no UK office. Its nearest European companies are in Ratingen (Germany), Brno (Czech Republic) and Nova Milanese (Italy). UK engineers can contact the European office in Ratingen for quotes and technical support.

What does Kollmorgen make?

Kollmorgen makes AKM and AKM2G servo motors, KBM and TBM2G frameless motors, Cartridge DDR and other direct-drive rotary motors, IC and IL direct-drive linear motors, AKD and AKD2G servo drives, and PCMM and PCMM2G EtherCAT machine controllers. EC and N2 electric cylinders are listed as discontinued.

Sources

1. Kollmorgen: Worldwide locations
2. Kollmorgen: History
3. Altra Industrial Motion: Completion of combination with Fortive's A&S platform (SEC 8-K exhibit)
4. Regal Rexnord: Completion of acquisition of Altra Industrial Motion (SEC 8-K exhibit)
5. Kollmorgen: AKM2G servo motor
6. Kollmorgen: AKD2G servo drive
7. Kollmorgen: AKD2G expansion press release (2023)
8. Kollmorgen: PCMM2G controller press release (2024)
9. Kollmorgen: TBM2G frameless motors
10. Kollmorgen: Direct drive linear motor selection guide

Figures are summarised from the sources above and from manufacturers' published data on the date shown. Always confirm against the current datasheet for your exact part.