Quote:
Originally Posted by ravichauhan
If I understand it correctly, you only need enough torque out of the motor to turn the impeller.
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When air is flowing (ie when the motor is energized and a held tube is not blocking the airflow), the impeller will impose a substantial load on the motor because it is accelerating a lot of air through the system.
Take a shop vac. Turn it on. Listen to the sound of the motor. Now cover the intake with your hand. Hear the pitch of the motor increase noticeably? The motor
speeds up when you cover the intake and block the airflow. That's because there's less load on the motor with the airflow blocked.