How Wiper Blades Work
The motor in the electric windshield wiper is driven by a worm gear on the armature shaft, which in turn rotates the output shaft. The output shaft then drives the output gear via an idler gear and an idler shaft. Finally, the output arm, connected to the windshield wiper linkage, is actuated by the output shaft. As the motor rotates, the output arm and linkage are driven to move back and forth.
The resistor located on the control switch is connected to the armature winding of the motor to regulate the motor’s speed. The driver can move the switch as needed to allow current to flow into the motor’s input circuit.
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