GM Window Motor
Virtually all modern General Motors automobiles have electrically-controlled windows. By simply pushing a button, the corresponding window can be opened or closed or simply adjusted to the desired level of opening. Consequently, less effort is necessary to operate the window. This feature is powered by the GM window motor. A window motor is an electrical motor located inside the door panel. It is connected to the window via the pantograph-like window arm. This window arm converts the rotational motion of the window motor into linear motion. The window arm is able to push the window up or pull it down by expanding or contracting. The direction is dependent on the rotation of the GM window motor.
When electricity is allowed to flow through the window motor in certain direction, the window motor responds accordingly. On the other hand, if the electrical current is reversed, the GM window motor will also reverse its rotation. The polarity of the electrical current also determines the polarity of the electromagnetic rotor of the GM window motor. Inside the window motor is rotor with multi-layered, cross-shaped iron core that is bounded by four sets of wire coils. These wire coils are connected to the electrical power source via the motor brushes. As the rotor spins, the magnetic polarity reverses. A set of permanent magnets are located on the internal wall of the window motor. The magnetic fields of the permanent magnets are counteracted by the alternating magnetic field of the wire coils. This causes the rotor to rotate.
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GM Window Motor - GM Window Motors