Skip to main content

POWERPAC® K and N Series Stepper Motors

POWERPAC® hybrid stepper motors deliver more power in a smaller package. These rugged NEMA 34 and 42 (90 and 110 mm) motors combine optimal magnetics in a housingless frame with a large diameter rotor and innovative rotor-stator design to produce more torque and smoother microstepping. The K Series incorporates flux-focusing SIGMAX® technology for higher acceleration with 25 percent more torque.

Product available worldwide


  • Wide range of standard options
  • Affordable co-engineered modifications with a short lead time to meet unique application requirements
  • N3 models, NEMA 34 (90 mm) motors are available in 4 stack lengths with torque ratings from 3.2 to 15.4 N-m (454 to 2,180 oz-in) nominal holding torque.
  • K3 models, NEMA 34 (90 mm) motors are available in 4 stack lengths with torque ratings from 4.08 to 19.7 N-m (578 to 2,790 oz-in) nominal holding torque.
  • N4 models, NEMA 42 (110 mm) motors are available in 3 stack lengths with torque ratings from 8.12 to 30.8 N-m (1,150 to 4,365 oz-in) nominal holding torque.
  • K4 models, NEMA 42 (110 mm) motors are available in 3 stack lengths with torque ratings from 10.4 to 40.3 N-m (1,470 to 5,700 oz-in) nominal holding torque.
  • Extensive selection of shaft configurations, terminations, windings and co-engineered modifications to suit your application needs, time frame and budget
  • Speeds up to 3,000 rpm meet the velocity demands of most high-torque applications
  • Improved torque linearity (above rated current) provides high peak torque to boost acceleration in intermittent-duty applications
  • High torque at moderate speeds to enable a cost-effective alternative to servo motors
  • Low detent torque harmonic provides smoother microstepping performance
  • K Series incorporates SIGMAX® technology for 25% more torque than N Series
  • Runs cooler than comparable steppers to provide longer, more reliable motor life
  • Special rotor design enables high acceleration
  • Rugged, “housingless” square frame means more torque in a smaller package
  • IP65 sealing for splashproof protection
  • Two-phase design is compatible with most drives and provides smoother microstepping and lower power input versus three-phase motors
  • Optional encoder mounting provisions

Media & Downloads

Title File Language Date Share URL
POWERPAC Installation bulletin en-EN English
Share URL /sites/default/files/public_downloads/POWERPAC_Installation_bulletin_en-EN_RevA.pdf
Nema 34 N3 K3 Stepper Systems TB English
Share URL /sites/default/files/public_downloads/Nema_34_N3_K3_Stepper_Systems_TB.pdf
Nema 42 N4 K4 Stepper Systems TB English
Share URL /sites/default/files/public_downloads/Nema_42_N4_K4_Stepper_Systems_TB.pdf
Title Language Date Share URL
Kollmorgen Catalogo Automazione e Motion Control IT Italian Share URLview
Kollmorgen Automation and Motion Control English Share URLview
Kollmorgen Optimized Solutions and Special Duty Motors English Share URLview
Kollmorgen otomasyon ve hareket kontrol çözümleri kataloğu TR Turkish Share URLview
Stepper and Synchronous Motors Catalog EN Rev C English Share URLview
科尔摩根运动控制及伺服系统解决方案 Chinese, Simplified Share URLview

These 3D models are intended to guide your design activities and may be used as reference information. Be sure to consult a Kollmorgen expert to ensure you have the most current and accurate information for critical aspects of design work.

Title File Language Date Share URL
3D/2D Models for PowerPAC English
Share URL
Title File Language Date Share URL
Blue Guide English, German
Share URL
CEL China Efficiency Labelling for Servo and Stepper Motors English
Share URL /sites/default/files/public_downloads/CEL%20Technical%20Notice%20on%20Efficiency%20for%20Servo%20and%20Stepper%20Motors.pdf
Kollmorgen CE Technical Notice - Servo and Stepper Motors Efficiency English
Share URL /sites/default/files/public_downloads/Kollmorgen%20CE%20Technical%20Notice%20-%20Servo%20and%20Stepper%20Motors%20Efficiency.pdf
Kollmorgen EU Declaration of Conformity PowerPac K-N-SN English
Share URL /sites/default/files/public_downloads/Kollmorgen%20EU%20Declaration%20of%20Conformity%20PowerPac%20K-N-SN.pdf


Trade Compliance
February 21, 2023
Ingress Protection of Servo Motors
April 18, 2019
Normen und Richtlinien
May 10, 2017

View all articles

Contact Us - Kollmorgen

Contact Us >

Follow the links here to find contact information for Global and North American support and sales information.
AGV Partner Portal

AGV Partner Portal >

From the AGV Partner Portal you will be able to access our NDC Services, such as Technical Support, Customer Service and Training. This is also where you download our latest NDC software.
Kollmorgen Channel Partners

Kollmorgen Channel Partner Site >

This secure site provides access to confidential material for the private use of approved partners only.

Engineer the Exceptional

Learn how to engineer exceptional machines, robots and vehicles with the highest-performing, most reliable motors, drives, automation solutions and more.

Learn More