Complete designation
Photograph the full model, serial and any build or option suffix. A shared U-series base name does not establish the same winding or shaft.
U-series ServoDisc
Kollmorgen / PMI U9M4 & U12M4 Replacement Review
Start a replacement assessment from the full U-series nameplate and the machine interface. U9M4, U12M4 and their suffix variants are identification references; the final motor and drive scope is determined by review.
Send Nameplate Details for Review ↗
Suffixes, shaft extensions and analogue feedback
Information that determines the U-series ServoDisc review
Flange and shaft
Capture the pilot, bolt circle, fastener thread, shaft diameter and extension. Preserve the original inch dimensions where applicable rather than rounding a catalogue metric equivalent.
Existing amplifier
Provide terminal voltage, current limit and amplifier model. A replacement using a different commutation method requires a compatible drive and wiring plan.
Feedback and brake
Identify tachometer voltage and polarity, encoder interface and any holding brake. Include their connector pin-outs and packaging length.
Machine duty
Describe starts, stops, reversals and load inertia. The required operating curve matters more than a single headline power rating.
Start with the complete code
Find a legacy motor reference.
Search the model, a family abbreviation or manufacturer. A result identifies equipment for review; every replacement proposal still needs mechanical, electrical and duty validation.
7 identification references. Status: engineering review required. Supply and current OEM availability are unconfirmed.
| Legacy nameplate reference | Manufacturer / family | Reference source | Next step |
|---|---|---|---|
| U6M4 U-series ServoDisc | PMI / Kollmorgen | Kollmorgen ServoDisc catalogue ↗ | Review U6M4 → |
| U9M4 U-series ServoDisc | PMI / Kollmorgen | Kollmorgen ServoDisc catalogue ↗ | Review U9M4 → |
| U9M4LR U-series ServoDisc | PMI / Kollmorgen | Kollmorgen ServoDisc catalogue ↗ | Review U9M4LR → |
| U9M4H U-series ServoDisc | PMI / Kollmorgen | Kollmorgen ServoDisc catalogue ↗ | Review U9M4H → |
| U12M4 U-series ServoDisc | PMI / Kollmorgen | Kollmorgen ServoDisc catalogue ↗ | Review U12M4 → |
| U12M4H U-series ServoDisc | PMI / Kollmorgen | Kollmorgen ServoDisc catalogue ↗ | Review U12M4H → |
| U16M4 U-series ServoDisc | PMI / Kollmorgen | Kollmorgen ServoDisc catalogue ↗ | Review U16M4 → |
Have a different suffix or unreadable plate?
Send the exact code or a controlled photo link. The absence of a search result does not prevent an industrial identification request.
Send nameplate details for review ↗Manufacturer names identify existing equipment. PancakeMotors is an independent engineering enquiry platform. Referenced catalogues and third-party conversion tables do not establish our affiliation, stock, authorisation or replacement compatibility.
Questions about this identification route
Can I request a U9M4 review without a CAD model?
Yes. Begin with the full nameplate code and clear photos of the flange, shaft and connectors. Missing dimensions can be collected during review.
Does a search result confirm a drop-in replacement?
No. It identifies the legacy family. Mechanical, electrical, feedback and operating-duty checks remain open until a proposed configuration is reviewed.
Check the source and the installed motor together.
Source documents identify legacy products. Actual option packages, application suitability, lifecycle status and replacement compatibility require confirmation for the complete nameplate code.
Review another legacy motor family
Kollmorgen / PMI JR16, JR24 & JR25 Retrofit Review ↗Ruggedized assembly, brake and support loadsYaskawa PMEE / Print Motor Replacement Assessment ↗Full model prefix, amplifier pairing and feedback polarityParvex Axem MC19 / MC24 Disk-Rotor Replacement Review ↗Exact MC suffix, tachometer package and brake length