Kollmorgen frameless motors give machine builders a compact way to add direct-drive motion inside equipment where a traditional housed servo motor may be too large, too heavy, or too mechanically restrictive. Instead of arriving as a complete framed motor with bearings, housing, feedback, and shaft already built in, a frameless motor is supplied as a rotor and stator set that installs directly into the machine. This allows the motor to become part of the mechanical assembly itself, helping transmit torque directly through the driven system.

For applications where space, weight, and responsiveness matter, this design can provide a major advantage. Robotics, UAV systems, gimbals, machine tools, medical devices, inspection systems, and other precision motion equipment often need high torque density without adding unnecessary mechanical bulk. Kollmorgen frameless motors are built for that type of environment, giving engineers more freedom to design around the machine instead of designing around a standard motor package.

To receive a comprehensive, industry competitive quote now, call Wake Industrial at 1-919-443-0207. Wake Industrial has the experience and inventory to support your business and keep your production line going. You can also contact Wake Industrial by filling out the quote form on the page or by sending an email to sales@wakeindustrial.com. You will receive a response within 15 minutes during business hours.

What Is a Frameless Motor?

A frameless motor is a motor kit made primarily from two main components: the stator and the rotor. The stator is fixed inside the machine housing, while the rotor mounts to the rotating shaft or driven assembly. Once installed, the machine’s own bearings, housing, feedback device, and mechanical structure become part of the complete motor system.

This is different from a traditional framed servo motor, which includes the motor housing, shaft, bearings, and other mechanical components in one finished package. A framed motor is often easier to mount as a standalone replacement, but it also adds size, weight, and mechanical interfaces between the motor and load. A frameless motor removes much of that structure and places torque generation closer to the driven axis.

Kollmorgen’s frameless motor designs are commonly used where compact direct-drive motion is more important than the simplicity of a standard bolt-on motor. Wake Industrial carries Kollmorgen motor products, including the Kollmorgen TBM Frameless Motors series.

Why Frameless Motors Are Used in Automation

The main benefit of a frameless motor is mechanical integration. Because the rotor and stator are built directly into the machine, the motor can drive the load with fewer intermediate parts. This can reduce backlash, lower compliance, improve response, and simplify the mechanical path between torque generation and the final moving element.

In many systems, removing couplings, gearboxes, belts, or added motor housings can improve system stiffness and reduce potential wear points. Fewer mechanical parts can also mean fewer failure points, which is especially valuable in equipment that runs continuously or operates in tight spaces where maintenance access is limited.

Frameless motors can also help reduce weight and save space. By eliminating the frame and using the machine structure as part of the motor assembly, designers can build lighter, more compact motion systems. That is why these motors are often found in robotic joints, compact rotary axes, defense systems, aerospace assemblies, and other applications where every inch and every pound matters.

If your equipment is already built around a Kollmorgen frameless motor and the original unit is obsolete, damaged, or difficult to identify, Wake Industrial can help with replacement and repair options. Call 1-919-443-0207 to speak with an industry professional regarding lead time, pricing, and condition.

Frameless Motors vs. Traditional Servo Motors

Traditional servo motors are still the best choice for many industrial machines because they are easier to mount, replace, and wire. A framed motor can often be swapped more quickly because the housing, shaft, bearings, and feedback are already packaged together. That makes them practical for packaging machines, conveyors, general automation axes, and many standard motion control systems.

Frameless motors are better suited for machines where the motor must disappear into the mechanical assembly. They are chosen when space is limited, weight matters, or the driven axis needs direct torque without added transmission components. The tradeoff is that the machine design must handle more of the mechanical and thermal responsibilities that a standard motor frame would normally provide.

Wake Industrial supports both categories. Customers looking for traditional Kollmorgen servo motor options can review the AKM Synchronous Servo Motors series, while customers sourcing compact direct-drive options can review the TBM Frameless Motors series.

TBM vs AKM Motors

When to Repair or Replace a Kollmorgen Motor

A Kollmorgen motor may need repair or replacement if it shows signs of winding failure, overheating, damaged leads, feedback issues, insulation breakdown, rotor damage, bearing-related problems in the surrounding machine assembly, or repeated drive faults tied to the motor. In frameless motor applications, symptoms may also appear as poor torque output, unstable motion, excessive heat, vibration, position error, or a machine axis that will not complete its normal movement.

If your Kollmorgen motor is down, do not let one failed component hold up the entire machine. Wake Industrial can help with Kollmorgen motor repair, replacement, refurbishment, and surplus sourcing for hard-to-find automation parts. Call 1-919-443-0207 today, send your part number to sales@wakeindustrial.com, or submit a quote request through the form on the page. Include the full Kollmorgen part number, photos of the unit or label, and any known fault symptoms so our team can help you move quickly toward the right repair or replacement option.