10.4.5 Interrupter-distributor
Distributor and contact-breaker unit (in common terms - "trembler") is designed for interrupting and distributing: interrupt - current flowing through the primary winding of the ignition coil, distribute - current from the secondary ignition coil between the spark plugs in the sequence, which is provided by the engine. A high-voltage wire from the secondary winding of the ignition coil is connected to the center of the distributor cover. Terminals that are connected to the spark plugs via high-voltage wires are located around the perimeter of the cover.
The circuit breaker can be contact and non-contact. In the contact breaker, the circuit of the primary winding of the ignition coil is due to the contacts, which is very unreliable.
Note
The reason for the unreliability of the contacts is that the disappearing magnetic field crosses the threads of not only the secondary but also the primary winding. This results in a self-induction current and a voltage of about 250-300 V. This causes the contacts to spark and burn out, and the current interruption in the primary winding is slowed down. This reduces the voltage in the secondary winding. Of course, this is solved by installing a condenser (usually with a capacity of 0.25 μf). However, there is such a thing as erosion. This is a gradual destruction of the contact surface, as a result of which they are loose and the voltage arising in the secondary winding of the ignition coil is reduced.
A special device called a Hall sensor was installed instead of contacts in order to eliminate the mechanical component of the breaker. There are no contacts - only control pulses that control the operation of the ignition coil.
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