Understanding eDrive Spin Testing

Electric Motor

Ever since electric drives were introduced as a means of propulsion, engineers have worked tirelessly to improve this system’s performance and efficiency. Today, electric drives are used in numerous applications, from drones to electric vehicles. As the popularity of electric drives continues to rise, so too does the need for comprehensive eDrive spin testing.

Modern electric motors are classified as high-performance machines. They are capable of operating at much higher speeds than traditional units, thus placing engine parts under greater amounts of stress. eDrive testing ensures that rotors and other components possess the structural integrity, durability, and balance to tolerate these increased forces.

What is eDrive Testing?

eDrive testing is used to analyze inverter-driven electrical motors and machines. These testing systems provide a solution that enables the performance and efficiency of electric motors to be precisely and accurately measured.

Traditional methods of testing were usually complicated and required a significant amount of calculations. A power analyzer, which was used to collect measurements and data, would provide raw and uncalculated data that was often unnecessary and difficult to interpret.

eDrive systems collect many of the same parameters as power analyzers, such as such as speed, torque, current, and voltage.  However, unlike power analyzers, eDrive systems use the collected raw data to perform real-time analysis, allowing engineers and operators to gain better insights into the electric drive under consideration.

This method of analysis is often paired with spin testing and other expert consultation services to supplement the development of high-performance electric motors and rotors. These include:

  • Detailed rotor growth mapping
  • Burst test and high-speed video imaging
  • Fatigue, LCF test (with RT-CDS and growth mapping)
  • Heated spin tests
  • Imbalance budgeting

Importance of eDrive Spin Testing

The high-speed electric motor industry faces many of the same challenges as the jet engine industry. Components that spin at high speeds are subjected to significant centrifugal force. This force, which is directed away from the axis of rotation, can result in the buildup of stresses which can cause deformation of the rotor. This problem can be further compounded when the centrifugal force interacts with various features integrated into the rotor’s structure.

It is therefore essential that the loads and stresses imparted by the electric motor to the rotor be precisely analyzed to understand component behavior and predict performance. Engineers use the information obtained from eDrive spin testing to perform analyses, computer modeling, and calculations, allowing them to make important design adjustments during the early stages of product development.

Industries that Use eDrive Spin Testing

Regardless of their size, shape, or application, almost all electric motors can reap the benefits of eDrive spin testing. Industries that frequently utilize this testing method on their components include:

  • Construction
  • Manufacturing
  • Textile
  • Elevator
  • Automotive
  • Power generation
  • Electrical/electronic
  • Food and beverage


eDrive testing provides essential information that would otherwise be unobtainable by traditional testing methods. One of its main advantages is the ability to convert complex raw data into clear and concise calculated output. When used with spin testing, engineers can better understand the behavior of rotors in high-performance electric motor applications.




Image Credit: Evannovostro/Shutterstock.com

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