D04FR Excavator Engine Starter Motor Assy Sk130 - 8 32g66 - 10101

Specification

Description

What is the starter motor?

The starter motor is an electric motor that turns over the engine to start. To turn the engine you need an electric motor that can provide lots of torque for a brief period of time, on demand, over and over again. But the engine needs to be started in the first place, that is exactly what the starter motor is, plus a mechanism to allow it to engage and disengage mechanically in an instant.

Function:

The primary function of a motor starter is to start and stop the motor to which it is connected. These are specially designed electromechanical switches similar to relays. The main difference between a relay and a starter is that a starter contains overload protection for the motor. So the purpose of the starter is two to switch the power automatically or manually to a motor and at the same time protect the motor from overload or faults.

How a Motor Starter Operates?

Basically, a starter is a switching device that consists of electrical contacts (both incoming and outgoing). Based on the operation, starters are primarily divided into hand operated and electrically operated devices. Hand operated starter consists of a lever on the side of it that can be turned on or off. Usually these are used for smaller motors as they are incapable of operating remotely. This type of motor starters causes the motors to restart immediately after a power interruption. This instant operation of the motor after power failure may leads to flow of dangerous currents into the motor and hence the motor will be damaged. This is the reason why most of the starters are equipped with electrical switches.

How does the starter motor start the engine?

The starter solenoid powers the starter motor. At the same time, the starter solenoid pushes the starter gear forward to mesh it with the engine flywheel (flexplate in an automatic transmission). The flywheel is attached to the engine crankshaft. The starter motor spins, turning over the engine crankshaft allowing the engine to start. In cars with a push button start, the system disengages the starter as soon as the engine starts running.