External Vent

Three-phase motors which are controlled by means of a frequency converter must be able to reach their maximum torque even in speed ranges below 50%.

Therefore the motor is supplied by the frequency converter with an increased motor current up to twice the rated motor current.

As an inevitable result the motor temperature rises quickly due to insufficient cooling. Thus burning out of the motor coil can only be avoided by external venting of the drive motor.

Special versions available
• extended fan shell (for operation with tachoalternator
or motor brake)
• alternative fixing hole positions
• different fan shell diameter
• other motor suppliers than listed in the
"Technical data" table