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Operation |
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Pull-in
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Turning the ignition switch to the START position allows current from the battery to flow to the hold-in coil and the pull-in coil. The current then flows from the pull-in coil to the armature coil via the field coil, causing the armature to rotate at low speed. The generated magnetomotive force in the hold-in coil and the pull-in coil magnetizes the pole core, and the magnetic switch plunger is pulled in to the pole core. By this pull-in operation, the pinion gear is pushed out and engages with the ring gear, and the contact plate turns the main contact on.
The figure on the left below summarizes the flow of current in the pull-in step
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SERVICE HINT:
In order to maintain the voltage required to actuate the magnetic switch, some models include a starter relay between the ignition switch and the magnetic switch
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