Starter motor warning

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Starter motor warning [Copy link]

Warning of the starter motor
The car starts by rotating the starter motor, dragging the flywheel to ignite the engine. Once the engine is on fire, the starter motor must be separated from the engine immediately. There is an electromagnetic clutch in the middle, which is usually the same as the starter motor. It is only closed and linked to the engine when the switch is turned off and the motor rotates. When the switch is separated, the motor does not rotate and it is also separated, and it is not linked to the engine.
Therefore, there are two extremes of electromagnetic clutch failure:
1. Not connected, it is not linked to the engine, and it cannot start and ignite. At this time, you can only hear the rotation of the starting electrode and the sound of the bridge gear.
2. Not separated, the engine can start. But after starting, there is still the sound of the bridge gear. (Sometimes there is a sound of the bridge gear during driving). Consequences: The starter motor is burned at the least, and the car is burned at the worst.
Therefore, once this abnormal sound occurs, the engine must be turned off immediately, and it can only be driven when there is no such abnormal sound, but it must be checked and repaired immediately.
At the same time, let’s talk about the ignition switch: there are also two kinds of failures of not connected and not separated. Not connected is a small matter, and at most it cannot be started. However, once it is not separated at start, the consequences are the same as the electromagnetic clutch not separated. If the engine still cannot be turned off, do not panic. You can unplug the fuse and remove the battery wires. The fastest way is to unplug two or more cylinder wires to force the engine to turn off in order to prevent fire.
The working principle of the starter motor has been described above. Now, in combination with the figure (on mychery.net), the working principle of the electromagnetic clutch is supplemented. Let's compare the appearance with the real object (open the engine cover, at the right front of the engine where it connects with the flywheel).
The electromagnetic clutch switch (4 in the figure) has two coils, one called the "pulling coil" and the other called the "holding coil". After power is turned on, the iron core moves due to the electromagnetic effect. The driving lever connects the bridge gear (12) with the flywheel ring gear of the engine to start the engine. After starting, release the ignition switch, the holding coil is de-energized, and the electromagnetic effect disappears. Therefore, due to the rebound force of the spring, the iron core of the electromagnetic clutch switch and the one-way clutch (11) and the bridge gear (12) are pushed back to their original positions - separated from the engine - the starter motor stops.
If it cannot be separated from the engine after starting, the engine will drag the starter motor instead, and the starter motor will become a generator, and the external circuit, which was originally a power supply circuit, will become a short circuit circuit in reverse. Therefore, the field winding (8) will heat up quickly and burn out.