Westerbeke Universal M-50 - Page 84

1. PC :Pull-in Coil
2. HC :Holding Coil
3. S :Switch
4. Drive Lever clutch
5. Screw Spline
6. Armature
7. Pole Core
8. Commutator
9. Contact Plate
When Start Button is Pushed:
Starter circuit
(3)
(1) (2)
When the start button is pushed on, a current flows from the battery through the pull-in coil in the
magnet switch section to the holding coil, energizing the plunger to pull it in. At this time, the
pinion moves by the drive lever to engage with the ring gear.
When start button is pushed
1. Battery
2. Starter Switch
3. Ground
4. Return Spring
5. Spline Tube
6. Pinion
7. Ring Gear
8. Operated By Lever
When contact plate is closed:
When the contact plate is closed, a large current flows through the motor section to generate a
large mechanical power which turns the engine crankshaft.
At this time, the pinion is moved forward by the screw spline for more contact.
Since the pull-in coil ends are short-circuited by the contact plate, the plunger is held only by the
force of the holding coil.
When contact plate il clo'"
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