What is a solenoid

What is a solenoid?

Your vehicle’s starter motor has the essential job of starting the engine. But something additionally has to start the starter. And that something is the solenoid. In most automotive purposes today, the solenoid is attached to the starter, with the two of them getting removed as a unit when necessary.


How a solenoid works

When walking properly, and as long as it has a furnish of fuel, the inside combustion engine continues to run by means of itself in an ongoing technique from the inertia of the engine’s shifting parts. But starting the engine is a separate procedure to get that inertia moving in the first place.

This is the job of the starting system, whose major factors encompass the:

  • Battery

  • Starter motor

  • Solenoid

  • Starter switch


Starting an engine: The first action

The manner includes not one, but two separate electric powered currents – a more advantageous one and a weaker one. When activated, normally with the aid of turning a key in the ignition switch, the weaker modern passes through the switch and to the solenoid. At that point, the modern forces two massive contracts to come together in the solenoid, which permits the more desirable electric powered present day to omit thru the solenoid’s contacts. These contacts lift a cutting-edge that requires heavy wiring cables without delay from the battery. This modern is heavy sufficient that it would be unwise to send it thru a hand-operated switching mechanism. Hence, the need for the

weaker contemporary through the ignition switch.

The more advantageous present day passes to the starter motor where it initiates two separate actions. The starter motor is designed so that the electric modern activates a lever, forcing small tools outward on a spring shaft. When extended, this year, referred to as a pinion, comes in contact with toothed tools on the outer rim of a giant flywheel on the give up of the engine’s force shaft. This giant tool is known as the starter ring gear.

Starting an engine: The second action

The second motion in a direct cutting-edge electric motor is the rotation of its central shaft, prompted via the large present-day passing via the motor. A motor transforms electric powered power into the mechanical strength of the central shaft’s rotation. It does this because the electric powered current interacts with the magnetic area in the starter motor and effects in the rotor on the shaft opening to turn. By the time this turning action reaches the motor’s designed pinnacle speed, the pinion at the give up of this shaft has already engaged the ring tools on the flywheel. The engine then begins going for walks on its own and the starter’s protection points automatically disengage the pinion from the ring gear. The spring brings the pinion safely back to its resting role and the job of the beginning mechanism is done.


When starting, if you maintain the ignition key in the “start” role a little too long, you will come across a problem. Here, too, is a spring that brings the change lower back to the “on” function from “start” as quickly as you release the key. If you fail to do so, you will hear the proof of your mistake especially quickly. The precise information is that your mistake is not as horrific as it sounds. The safety mechanism in the starter has already launched the opinion from the ring gear. The bad information is if you do this frequently or for any prolonged period, you might also extensively shorten the existence of the starter motor.

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