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I think Fred is correct on this one. It's not the motor, it's the blower which is a form of centrifugal pump. Like a squirrel cage fan on your furnace. If you completely plug the supply (or exhaust) of air, the motor will completely unload. It can't do any work if it isn't moving air.

On the other hand, the more freely it can move the air, the more air it will move at a higher speed and therefore do more work loading the motor more. Of course motor characteristic are going to play a role. So it's also not going to be as simple as an unrestricted blower is certain to overload the motor.
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