High-speed motors have low inductance to allow sufficient current at their operating frequency. Unlike standard motors, they lack the filtering effect that reshapes the PWM (Pulse Width Modulation) output of the drive into a sine wave. As a result, PWM switching noise passes through the motor windings unfiltered, causing excessive heat buildup. This overheating can eventually damage or burn the motor windings.

Countermeasures:

• A sine filter placed between the drive and motor is the standard solution to mitigate this issue. Our standard sine filters support output frequencies up to 100 Hz, but higher frequencies will require custom filters.
• In some cases, less expensive AC output reactors may be sufficient. However, it is essential to confirm this with the motor manufacturer to ensure proper protection and performance.

By implementing the appropriate solution, you can prevent damage and extend the lifespan of your high-speed motors.

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