For a roadworthy vehicle, a starter is necessary, as an internal combustion engine cannot start by itself. Here we will talk something about starter motors.
1. What is a starter motor?
A starter, called a cranking motor, a self-starter, or a starter motor as well, is an electric motor which can crank an internal-combustion engine so that to start the vehicle under its own power. For very large engines, the starter can even be an internal-combustion engine. An internal combustion engine seems like a feedback system. Once it is started, it depends on the inertia from one cycle to start the next cycle. Besides, there are many kinds of starters, such as electric starters, pneumatic starters, or hydraulic starters.
In most cars, it is located near the engine and transmission. Normally a starter motor contains a powerful DC (Direct Current) electric motor and a starter solenoid. The solenoid gets power from the battery and then transfers it to the starter motor.
2. How does an electric starter work?
As mentioned-above, a starter solenoid is attached to the DC electric motor, which will push the starter gear forward, allowing the starter gear and the gear teeth of the flywheel of the engine to be meshed.
In order to let the engine start, it needs to be turned over at a speed which can make the fuel and air get into the cylinders and then compress them.
The powerful starter motor is the one who does the turning job. The starter motor is a heavy-duty electric motor powered by a 12-volt battery. It needs a high electric current to turn over the engine. Once the starter receives a huge electric current, it will draw through thick wires from the battery.
Normally, a starter motor lasts for 100,000-150,000 miles. However the starter motor may last for the lifetime of some vehicles, but in some cars, it can fail prematurely.
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