Motor Testing - Clark Testing

Motor Testing


Clark Testing offers motor testing services to our industrial customers with a full complement of capabilities. Our Motor Alternator (MA) test system is capable of static or dynamic testing of AC motors up to 625 VAC at 577 Amps (800 HP), from 0 to 60 Hz.

Motor Testing services per IEEE 112 include:


  • Load Testing
  • Locked Rotor Testing
  • Core Loss Testing
  • Temperature Testing
  • Voltage Imbalance
  • Current Imbalance
  • Efficiency Calculations

Clark’s Motor Testing Experience includes:



  • Traction
  • AC/DC Brushless
  • Linear
  • Direct Drive
  • DC Shunt Motor
  • Cumulative Compound Motor
  • Three phase Synchronous Motor
  • Squirrel Cage Induction Motor
  • Double Squirrel Cage Motor
  • Slip ring Induction Motor
  • Single phase Synchronous Motor
  • Separately excited DC motors

Dynamometer Motor Testing


In addition to our MA motor testing system we also feature dyno testing for large motors. The dyno test lab measures power, force or moment of force. The power of a motor, engine or other rotating prime mover is calculated by measuring rotational speed and torque at the same time.

The dyno can also indicate how much torque and power are necessary to operate pumps and other driven machines. In these cases, the appropriate tool is a “driving” dynamometer. Dynos that are not designed to be driven are called “absorption” or “passive” dynamometers. Some dynos can absorb or drive depending on testing needs. These are called “universal” or “active” dynamometers.

AC motor dynamometers and DC motor dynamometers are key to the development and testing of electric motors. The dyno allows for variable and full load testing necessary to ensure optimal function.

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Clark Testing has been providing product qualification testing and design verification for manufactures for over 20 years. We provide our clients with independent testing.

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Clark Testing continuously operates under stringent quality assurance guidelines ensure all policies, practices and procedures meet or exceed industry standards. Clark’s QA/QC programs follow the accreditation guidelines of ISO 17025-2017, 10CFR50 Appendix B, NQA-1 and AIHA.

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