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AKM43E-EKCNR-01 Kollmorgen

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The Kollmorgen AKM43E-EKCNR-01 is part of the AKM Synchronous Servo Motors series and features an 84mm frame dimension. This motor has a resolver feedback system with single turn, inductive feedback and is equipped with 2 SpeedTec Ready connectors. It is designed without a brake and includes a shaft seal along with an open keyway on the shaft.

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Product Description:

The AKM43E-EKCNR-01 is part of the AKM Synchronous Servo Motors series manufactured by Kollmorgen. It is an AC servo unit intended for tightly regulated motion loops in assembly stations, pick-and-place heads, and similar industrial automation axes. The motor converts controlled drive current into precise rotary motion for positioning and speed-regulated tasks. Its compact frame helps it fit densely packed motion systems where axis spacing is limited. By pairing a compact electromagnetic stack with standardized AKM mounting features, it provides high dynamic torque without requiring a different mechanical layout across a multi-motor platform.

The housing profile measures 84 mm across the square frame, so it fits machinery that follows the AKM40-class bolt pattern. A rotor length index of 3 increases active iron volume, raising continuous torque while keeping the overall diameter unchanged. The shaft has an open keyway to reduce coupling slip under reversing loads, and a dedicated shaft seal helps keep coolant splash away from the front bearing. That combination supports reliable torque transfer during frequent starts and reversals. Kollmorgen uses winding code e for this motor, indicating phase resistance and inductance suited to mid-voltage bus supplies. This allows the controller to apply rated current without unnecessary derating.

Power and feedback are routed through 2 SpeedTec Ready connectors that use a twist-lock style to simplify cable attachment in tight cabinets. Inside the rear housing sits a resolver that uses 2 poles to establish rotor position during each electrical cycle. Its single-turn inductive design avoids optical disks and maintains signal integrity in oil-mist environments. This feedback arrangement supports stable commutation and consistent speed control during repetitive motion. It also works well in installations where light contamination can interfere with optical sensing methods.

Brake System
Without brake
Connector Arrangement
2 SpeedTec Ready connectors
Customization Feature
With shaft seal
Feedback Resolution
2 poles
Feedback System
Resolver
Feedback Turns
Single turn, inductive
Feedback Type
Size 10/15/21
Frame Dimension
84mm
Product Family
AKM Synchronous Servo Motor
Rotor Length Index
3
Shaft Detail
Open Keyway
Winding Designation
e
  • AKM-43E-EKCNR-01
  • AKM43E-EKCNR-O1
What you observe Probable cause First things to try
Drive trips F219 “Motor over-temperature” within minutes Stator PTC has reached ≈155 °C Reduce load, improve cabinet airflow, verify fan and ambient ≤ 40 °C, check sensor wiring to X9
F226 “DC-bus undervoltage” at accel/decel Mains dip or brake-resistor oversized Check mains fuses, lengthen decel ramp, test DC-link caps
F228 “Position/velocity deviation” after mechanical work Loose coupling/backlash or inertia mismatch Re-home axis, tighten hub, re-tune AKD servo-loop gains 
Sporadic F229 encoder quadrant error Resolver/EnDat feedback noise Inspect feedback cable for shield continuity, route away from motor power pair
Motor shaft hot to touch, no fault Radial shaft seal running dry or bearing wear Check for mis-alignment, replace seal, re-grease/replace bearings 
High vibration at nominal speed Rotor unbalance or keyed-hub loosened Verify key fit, re-balance per AKM manual spec (G = 6.3) 
Audible “cogging” at very low speed Incorrect commutation offset Run AKD “Hall/Resolver alignment” wizard, save parameters 
Brake will not release (unit has spring brake option) Undersized 24 V brake supply Measure brake-coil voltage while enabling, size PSU +20 % headroom 
Shaft seal leaks oil / IP65 lost Seal damaged by dry run or over-pressure Fit new IP65 seal, add vent/drain, avoid > 5 psi housing pressure 
Insulation test < 100 MΩ to ground Moisture ingress in stator Bake motor at 80 °C for 8 h, re-test; if ≤ 10 MΩ replace stator 
Code Meaning
F219 Motor over-temperature – PTC/NTC > 155 °C
F218 Drive heatsink over-temp – cabinet airflow blocked
F220 Bleeder-resistor overload during fast decel
F221 Motor-temperature sensor open/short
F226 DC-bus undervoltage (< 560 V dc)
F228 Excessive position/velocity deviation
F229 Encoder quadrant error – noisy resolver/Hiperface signals
F230 Encoder max-frequency exceeded – overspeed or noise
F234 E-Stop active / +24 V removed
F405 “Phase regression” – drive lost SERCOS / EtherCAT sync
Model Continuous/Stall Torque (Nm) Peak Torque (Nm) Max Speed (rpm) Max DC-bus (V) Weight (kg)
AKM43E-EKCNR-01 4.7 15.9 7 500 640 4.35
AKM42E-EKCNR-00 3.42 11.5 4 000  640 3.29 
AKM43E-GCC2R-00 4.7 15.9 6 000  640 4.35
AKM43G-EKCNR-01 1.54 6 000  640 (max)  4.15
AKM44E-EKMNR-00 5 3 000  8
AKM43E-ANCNR-00 4.70  6 000 

Frequently Asked Questions about AKM43E-EKCNR-01:

Q: Is the AKM43E-EKCNR-01 servo motor equipped with a brake system?

A: The AKM43E-EKCNR-01 servo motor does not include a brake system.

Q: What type of electrical connector arrangement does the AKM43E-EKCNR-01 have?

A: This model features 2 SpeedTec Ready connectors for electrical connections.

Q: What type of shaft detail is provided on the AKM43E-EKCNR-01 servo motor?

A: The AKM43E-EKCNR-01 includes an open keyway shaft design.

Q: What type of feedback system does the AKM43E-EKCNR-01 use?

A: It uses a resolver feedback system with single turn inductive feedback.

Q: What is the frame dimension of the AKM43E-EKCNR-01 model?

A: The frame dimension of this servo motor is 84 mm.


Internal Product Review

  • ‘‘AKM43E-EKCNR-01 is a Kollmorgen AKM synchronous servo motor engineered for precise motion control with a resolver feedback system and single-turn inductive feedback. An open keyway shaft and shaft seal support dependable mechanical integration in demanding equipment. Strong connection flexibility comes from 2 SpeedTec Ready connectors.’’

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