Description
Product Introduction
The Kollmorgen AKM42E-EKGNR-01 is an AKM-series brushless synchronous servo motor for medium-duty industrial motion axes. With an 84 x 84 mm flange, 1.14 kW rating, and 4000 rpm capability, it fits packaging machinery, robotics, material handling, and precision positioning equipment.
This configuration uses an E winding, 16-bit resolver feedback, an open-keyway shaft with shaft seal, and two M23 connectors. Its 640 VDC maximum bus rating distinguishes it from lower-voltage AKM variants, so amplifier voltage class and feedback compatibility must be checked before substitution.
Key Technical Specifications
| Parameter | Value |
|---|---|
| Manufacturer | Kollmorgen |
| Series | AKM Synchronous Servo Motors |
| Motor type | Brushless permanent-magnet synchronous servo motor |
| Frame / flange | 84 x 84 mm, accuracy class N |
| Winding | Type E |
| Feedback | 16-bit, 2-pole resolver with hollow-shaft construction |
| Maximum DC bus voltage | 640 VDC |
| Rated output | 1.14 kW / 1.53 hp |
| Stall torque | 3.42 Nm / 30.3 lb-in |
| Nominal torque | 2.72 Nm |
| Rated speed | 4000 rpm |
| Shaft | 31.75 mm height, open keyway, with shaft seal |
| Connectors | Two M23 straight connectors |
| Brake | Not indicated for this configuration; verify OEM drawing before assuming brake availability |
| Protection | IP67 |
| Insulation class | Class F |
| Cooling | Natural convection / air-cooled construction |
| Weight | Approximately 2.8 kg, per one supplier listing; verify against nameplate |
Application Scenarios & The “Trench” Experience
A packaging machine’s main transport axis starts hunting after a warm-up period. The drive logs a feedback alarm intermittently, but the motor still turns. Technicians replace the servo amplifier; the fault returns. On an AKM42E with resolver feedback, the more likely culprit is a heat-affected feedback connector, damaged resolver pigtail, or degraded motor winding insulation—not the drive.
- Packaging machinery – Product transport, indexing, and rotary-table axes – Required for its 1.14 kW output, 3.42 Nm stall torque, and 4000 rpm rating.
- Robotics and automated assembly – Joint, gantry, or pick-and-place motion – Required for resolver-based closed-loop control in a compact 84 mm flange package.
- Material handling – Conveyor, diverter, and lifting axes – Required for controlled acceleration and repeatable positioning under varying load.
- Semiconductor equipment – Precision positioning and handling stages – Required for high-resolution feedback and clean, sealed M23 connectivity.
- Legacy machine repair – Direct replacement of a failed AKM42E-EKGNR-01 – Required because winding, feedback, shaft, connector, and voltage class are all model-specific.
Field case study: A converting line experienced intermittent position faults on a 640 VDC servo axis. The amplifier was replaced first, but the fault came back within days. Inspection found a cracked resolver connector and insulation discoloration near the motor’s M23 fittings. A tested AKM42E-EKGNR-01 restored stable commutation and eliminated the alarm. The original amplifier was fine; the motor feedback path was not.
AKM42E-EKGNR-01
AKM42E-EKGNR-01
Transparency SOP: Quality Assurance & Testing
We don’t just ship boxes; we test them on compatible Kollmorgen servo hardware where available.
- Inbound inspection: Verify model marking, flange and shaft condition, connector threads, shaft seal, cable/connector damage, and evidence of water ingress or prior repair.
- Anti-counterfeit check: Compare nameplate format, housing construction, magnet behavior, and connector hardware against known Kollmorgen AKM examples.
- Live rig testing: Connect to a compatible Kollmorgen servo amplifier, verify resolver recognition, commutation, and stable closed-loop torque/speed operation.
- Electrical checks: Measure winding resistance, phase balance, and insulation resistance; inspect for shorted turns or degraded insulation.
- Feedback verification: Rotate the shaft through a full revolution and confirm stable resolver signal and correct commutation alignment.
- Mechanical checks: Check bearing noise, shaft runout, axial play, seal condition, and abnormal drag.
- Final QC and packaging: Record test results, protect the shaft and connectors, and ship in anti-static, impact-resistant packaging.
The Veteran’s Tech Trap Guide
- ⚠️ Do not assume all AKM42E motors are interchangeable. The suffix
EKGNR-01defines winding E, resolver feedback, keyway shaft, shaft seal, connector arrangement, and 640 VDC bus class. A different suffix can mean a different feedback device, shaft, or voltage rating. - ❗ Check the servo amplifier bus voltage first. This motor is specified for up to 640 VDC bus operation. Pairing it with a 320 VDC-class drive without verifying compatibility is a commissioning mistake, not a minor inconvenience.
- ⚠️ Inspect the resolver pigtail and M23 connectors. Feedback alarms are frequently caused by damaged shields, loose backshells, or heat-damaged connectors—not a failed motor.
- ❗ Do not connect it directly to mains. It requires electronic commutation from a compatible servo amplifier; direct line power will damage the motor and create a serious safety hazard.
- ⚠️ Confirm brake requirements separately. Public listings for this exact configuration do not consistently identify an integrated brake. If the axis is vertical or can coast under gravity, verify the OEM drawing and select a brake-equipped variant if required.
Frequently Asked Questions
Q: Is the AKM42E-EKGNR-01 hot-swappable?
A: No. Remove drive power, allow the servo-drive DC bus to discharge, lock out the machine, and verify zero voltage before disconnecting motor or feedback connectors.
Q: What feedback does it use?
A: A 16-bit, 2-pole resolver with hollow-shaft construction. It is not a HIPERFACE DSL or incremental-encoder motor, so feedback compatibility must be confirmed before substitution.
Q: Can I use it with a 320 VDC Kollmorgen drive?
A: Not automatically. The motor is listed with a 640 VDC maximum bus voltage; the drive must support the appropriate bus class, resolver feedback, and required continuous/peak current.
Q: Does it include a brake?
A: The available technical listings for this exact suffix do not clearly identify an integrated brake. Do not assume one is present; verify the OEM datasheet or motor drawing before using it on a vertical axis.
Q: Is it compatible with AKM42E-EKCN R or other AKM42 variants?
A: Not as a direct swap. Feedback type, connector style, shaft configuration, winding, and voltage class can differ between suffixes. Match the complete model number and machine documentation.
Q: Why is surplus stock cheaper than a new OEM motor?
A: Surplus suppliers source discontinued inventory, excess project stock, and decommissioned equipment. The price can be lower, but condition and test coverage vary—so require winding, insulation, resolver, and live commutation test evidence.
Q: What warranty is reasonable?
A: For a tested refurbished or surplus unit, 12 months is a fair baseline. Some suppliers advertise 365-day coverage; confirm whether it covers functional failure, repair, replacement, or only limited conditions.
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