1. DC motor
The DC motor is the motive force
of the output torque, and most of its structures use a four-pole series-excited
motor. Such a motor has a large output torque at a low speed and a strong
overload capability.
2. Clutch
mechanism
The function of the clutch
mechanism is to transmit the torque of the armature to the flywheel ring gear
through the start gear, and the power of the motor is transmitted to the
crankshaft to start the diesel engine. After starting, the motor is automatically
separated from the diesel engine to protect the starter motor from damage. The
clutch mechanism mainly has two types of spring type and friction type. Most of
the starter clutch mechanisms of medium and small power diesel engines are
spring-loaded, and the starters of high-power diesel engines mostly use friction
plate clutch mechanisms.
3. Control
switch
The electric starting system
mainly has two kinds of electromagnetic and mechanical control switches,
wherein the electromagnetic switch uses the electromagnetic suction to drive
the fork to start.
Assembly and test method for
starting motor of diesel generator set
I Start
motor assembly
The assembly steps of the starter
motor are exactly the opposite of the disassembly steps. Note the following
when assembling:
1. Apply a small amount of grease
to the friction parts of each bushing armature journal, key-way, etc. Do not
miss out on the various gasket and assemble them in order.
2. When the outer casing is
combined with the front and rear covers, locate the positioning holes and then
assemble the two long bolts and tighten them.
3. When assembling the
electromagnetic switch, the armature must be assembled according to the technical
requirements. After the armature is assembled, it should be pulled by hand to
determine whether it is fixed. After the armature lever and the fork are
installed correctly, install the electromagnetic switch and tighten the two
fixing screws.
4. Brushes with insulating
sleeves shall be installed the insulated brush holder according to technical
requirement.
5. After the starter motor is
installed, when the drive gear is toggled with a screwdriver, it can be rotated
flexibly without jamming. If the axial clearance of the armature is too small
or too large, the thickness of the front and rear cover gasket of the shaft can
be changed to adjust.
6. After the starter motor is
assembled, check and adjust the clearance between the starter motor gear and
the lock nut. During the inspection. The armature is pushed to the bottom. At
this time, the gap between the drive gear and the lock nut should be in the
range of 1.5-2.5 mm. When the gap value is too large, the drive gear cannot be
completely combined with cover will be damaged. If the clearance value does not
meet the technical requirements, the adjustments screw on the starter motor can
be adjusted to meet the requirements. After adjustment, tighten the lock nut.
II starting
motor test
After the starter motor is
assembled, it should generally be tested on a diesel engine. When testing, it
is necessary to use a battery with sufficient power. The test start motor
should meet the following conditions:
1. When the diesel engine is
started, the power to start the motor is sufficient, and there is no abnormal
noise.
2. There should be no strong
sparks at the brushes and commutators.
3. At start-up, the drive gear is
not allowed to rotate at high speeds and the metal ringing of the gears hitting
the flywheel ring gear.
Precautions
for the use of diesel generator set starter motor
1. The continuous working time of
the diesel engine should not exceed 10s every time, and the interval between
the two starts should be more than 2min to prevent the armature coil from
overheating and burning out. If the three times can not be successfully
started, the cause should be found and then started.
2. When the drive gear is heard
to rotate at a high speed and cannot mesh with the ring gear, the start button
should be quickly released. After the starter stops working, the second start
is performed again to prevent the drive gear and the flywheel ring gear from
colliding with each other and being damaged.
3. When using diesel generator
sets for power supply in cold areas, use antifreeze oil. When starting, use a
one screwdriver to pull the flywheel inspection hole for a few weeks before
starting.
4. After the genset is started,
its start button should be quickly released to return the drive gear to its
original position.
5. During normal operation, it is
strictly forbidden to press the diesel engine start button again.
6. Grease should be added to the
front and rear cover bushings regularly to prevent dry friction from damaging
the shaft and bushing.
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