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EKM Series Brushless AC Servo Motors

These enhanced, high performance motors are MilSpec 810E rated and IP67 sealed. They are supplied standard with a stainless steel shaft and chemical agent-resistant paint for reliable duty in harsh environmental conditions.

Product available worldwide
Kollmorgen EKM Servo Motor Series


  • 0.43 to 53 Nm continuous stall torque (3.8 to 467 lbin)
  • Speeds up to 8000 RPM meet high speed requirements
  • 480 VAC High Voltage Insulation.
  • Custom windings, shaft variations, and failsafe brakes available
  • Rugged resolver feedback for extreme environment Operating temperature range of -51°C to 54° C
  • Shock and vibration tested per MILSTD810E, Methods 516.4 & 514.4, Procedure 1
  • International standard mount available
  • Low-cog, low harmonic distortion magnetic designs.
  • Connectivity: High performance nickel-plated MIL-C-38999 connectors with total environmental sealing, quick mating, triple lead threaded, self-locking coupling, as well as EMI and RFI shielding. In addition, both front-facing and rear-facing options are available.
  • Stainless steel shaft and fasteners prevent external corrosion while a chemical agent resistant paint allows resistance to harsh outdoor environments and chemicals.
  • Sealing: IP67 rated for ingress prevention and brief submergence as well as 100-psi wash down. In addition, a viton shaft seal comes standard.


Frame Size Stack Length Windings Max BUS (VDC) Max Stall Tc Nm (lb-in) Max Tp Nm (lb-in) Max Rated N Max Rated Power @ Max BUS kW (Hp)
EKM2 1,2,3,4 C,D,E,F,G 640 1.37 (12.2) 4.77 (42.2) 8000 0.89 (1.19)
EKM3 1,2,3 C,D,E,H 640 2.83 (25.1) 10.2 (90.3) 8000 1.16 (1.56)
EKM4 1,2,3,4 C,E,G,H,J,K 640 5.93 (52.5) 20.3 (180) 6000 1.68 (2.26)
EKM5 1,2,3,4 E,G,K,L,M,N,P 640 14.3
38.3 (339) 6000 3.82 (5.12)
EKM6 2,3,4,5 G,K,L,M,N,P 640 24.8 (219) 65.0
6000 6.05 (8.11)
EKM7 2,3,4 K,L,M,P 640 52.8 (467) 143 (1269) 6000 7.64 (10.24)

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Title Language(s) Date Size
EKM Series Servo Motors Selection Guide English 22 Apr 2021 3.67 MB Copy URL
Kollmorgen Automation and Motion Control English 14 Jun 2021 15.53 MB Copy URL
Resolving Servo Feedback Choices This PowerPoint presentation explains the differences between different types of servo motor feedback devices, including: The differences between absolute and incremental devices. The...
Ingress Protection of Servo Motors [toc] Sealing is an important design tool used to prolong the life of motors against harsh environments containing dust or liquid contaminants. There are arguably an unlimited number of...
Normen und Richtlinien [toc] Allgemeines Struktur des Normenwesens am Beispiel der EN ISO 12100 Europäische Richtlinien New Legislative Framework Blue Guide: Leitfaden für die Umsetzung der...
Hall Sensor Alignment Process Hall Effect Sensors are used to establish proper motor commutation on Brushless Servo motors.  To be effective, the Hall Effect Sensors must be properly aligned with the servo motors phases....
EKM Motor Connectors and Corresponding Mating Connectors Kollmorgen does not offer power or feedback cables for the EKM series servomotors. Typically customer's will build their own cables for applications using the EKM motors. The EKM motor connector...


Title Language(s) Date Size
Blue Guide German 15 Jul 2015 Copy URL