How DC Starter Motor Works?
How DC Starter Motor Works? Delco-Remy 37-MT, 41-MT, and 42-MT Starter Motor
Please visit to My Youtube Channel: Blog Teknisi, illustrated as detailed below;
General Information
Rest Position
(1) Return Spring
(2) Solenoid
(3) Pull-In Winding
(4) Start "S" Terminal
(5) Hold-In Winding
(6) Battery "B" Terminal
(7) Key Start Switch
(8) Solenoid Contacts
(9) Motor "M" Terminal
(10) Shift Lever
(11) Field Winding
(12) Pinion Drive
(13) Pinion
(14) Armature
(15) Battery
A DC series wound motor is used as the starting motor. The starting motor has field winding (11) and
armature (14). The excitation and armature windings are connected in series. The pinion end of the armature shaft has splines for pinion drive (12).
The solenoid is an integral part of the starting motor. The solenoid pushes the pinion drive (12) with the pinion (13) forward through the shift lever (10) and the plunger. The end of the plunger is a spool which is connected to the shift lever. Return spring (1) helps return pinion drive (12) and shift lever (10) to the rest position after key start switch (7) is released and solenoid contacts (8) have been opened. A semi-solid link mechanism prevents welding of the solenoid contacts.
The starting motor has a two-stage mechanical pinion drive (12) that protects armature (14) from an
overspeed condition. The pinion drive also allows a smooth engagement of pinion (13) into the flywheel ring gear. The pinion drive is held on the splines of the armature shaft. The pinion drive is connected to the pinion (13) through the teeth of the integral overrunning clutch. Shift lever (10) moves the pinion drive (12) axially in the direction of the ring gear.
Partial Engagement
(1) Return Spring
(2) Solenoid
(3) Pull-In Winding
(4) Start (S) Terminal
(5) Hold-In Winding
(6) Battery (Bat) Terminal
(7) Key Start Switch
(8) Solenoid Contacts
(9) Motor (Mtr) Terminal
(10) Shift Lever
(11) Field Winding
(12) Pinion Drive
(13) Pinion
(14) Armature
(15) Battery
When the key start switch (7) is closed, the following components are energized: start (S)terminal (4), pull-in winding (3) and hold-in winding (5). The solenoid plunger pulls the shift lever (10) against the force of the spring (1). The shift lever pushes the pinion drive (12) toward the engine flywheel. The armature (14) has not yet turned. The solenoid contacts (8) have not closed. This sends starting motor current to the excitation windings and the armature windings. If the pinion (13) can immediately engage the flywheel ring gear, the pinion moves forward. When the pinion reaches the end of the drive pinion shaft and the solenoid contacts (8) close. The starting motor is now in partial engagement.
Block Engagement
(1) Return Spring
(2) Solenoid
(3) Pull-In Winding
(4) Start (S) Terminal
(5) Hold-In Winding
(6) Battery (Bat) Terminal
(7) Key Start Switch
(8) Solenoid Contacts
(9) Motor (Mtr) Terminal
(10) Shift Lever
(11) Field Winding
(12) Pinion Drive
(13) Pinion
(14) Armature
(15) Battery
If a pinion tooth meets a ring gear tooth, the pinion cannot immediately mesh with the ring gear. The solenoid contacts (8) close as the meshing spring is compressed through the shift lever (10). The starting motor is now turned on. The operation turns the pinion (13). The pinion initially meshes with the teeth of the ring gear. The pressure from the meshing spring causes the pinion (13) to fully mesh. The pressure from the meshing spring causes the ring gear to fully mesh.
Full Engagement
(1) Return Spring
(2) Solenoid
(3) Pull-In Winding
(4) Start (S) Terminal
(5) Hold-In Winding
(6) Battery (Bat) Terminal
(7) Key Start Switch
(8) Solenoid Contacts
(9) Motor (Mtr) Terminal
(10) Shift Lever
(11) Field Winding
(12) Pinion Drive
(13) Pinion
(14) Armature
(15) Battery
At the end of solenoid armature travel, solenoid contacts (8) close. This allows full battery voltage to be applied to battery (Bat) terminal (6) and motor (Mtr) terminal (9). The starting motor current energizes the field winding (11). The starting motor current powers the starting motor. Armature (14) now begins to rotate and the helical spline forces the pinion farther into the ring gear until the pinion contacts the stop ring of the armature shaft.
The pull-in winding (3) is turned off when the starting circuit is closed. Hold-in winding (5) remains
energized. The hold-in winding magnetic force is enough to hold the solenoid plunger in the pull-in position until the engine is started.
When the engine starts and the ring gear turns pinion (13) faster than the starting motor, the clutch section of the pinion drive (12) breaks the connection between the pinion and the armature shaft. This prevents damage to the armature from being rotated too fast. The pinion remains meshed with the ring gear while the shift lever (10) is held in the engaged position. The shift lever assembly and pinion drive are returned to the rest position by the return spring (1) only when the key start switch is released. The return spring also keeps the pinion in the rest position until the starting motor is again operated.
Read More:
How DC Alternator Works?
DC Starter Motor Components
Blog.Teknisi
Please visit to My Youtube Channel: Blog Teknisi, illustrated as detailed below;
General Information
Rest Position
(1) Return Spring
(2) Solenoid
(3) Pull-In Winding
(4) Start "S" Terminal
(5) Hold-In Winding
(6) Battery "B" Terminal
(7) Key Start Switch
(8) Solenoid Contacts
(9) Motor "M" Terminal
(10) Shift Lever
(11) Field Winding
(12) Pinion Drive
(13) Pinion
(14) Armature
(15) Battery
A DC series wound motor is used as the starting motor. The starting motor has field winding (11) and
armature (14). The excitation and armature windings are connected in series. The pinion end of the armature shaft has splines for pinion drive (12).
The solenoid is an integral part of the starting motor. The solenoid pushes the pinion drive (12) with the pinion (13) forward through the shift lever (10) and the plunger. The end of the plunger is a spool which is connected to the shift lever. Return spring (1) helps return pinion drive (12) and shift lever (10) to the rest position after key start switch (7) is released and solenoid contacts (8) have been opened. A semi-solid link mechanism prevents welding of the solenoid contacts.
The starting motor has a two-stage mechanical pinion drive (12) that protects armature (14) from an
overspeed condition. The pinion drive also allows a smooth engagement of pinion (13) into the flywheel ring gear. The pinion drive is held on the splines of the armature shaft. The pinion drive is connected to the pinion (13) through the teeth of the integral overrunning clutch. Shift lever (10) moves the pinion drive (12) axially in the direction of the ring gear.
Partial Engagement
(1) Return Spring
(2) Solenoid
(3) Pull-In Winding
(4) Start (S) Terminal
(5) Hold-In Winding
(6) Battery (Bat) Terminal
(7) Key Start Switch
(8) Solenoid Contacts
(9) Motor (Mtr) Terminal
(10) Shift Lever
(11) Field Winding
(12) Pinion Drive
(13) Pinion
(14) Armature
(15) Battery
When the key start switch (7) is closed, the following components are energized: start (S)terminal (4), pull-in winding (3) and hold-in winding (5). The solenoid plunger pulls the shift lever (10) against the force of the spring (1). The shift lever pushes the pinion drive (12) toward the engine flywheel. The armature (14) has not yet turned. The solenoid contacts (8) have not closed. This sends starting motor current to the excitation windings and the armature windings. If the pinion (13) can immediately engage the flywheel ring gear, the pinion moves forward. When the pinion reaches the end of the drive pinion shaft and the solenoid contacts (8) close. The starting motor is now in partial engagement.
Block Engagement
(1) Return Spring
(2) Solenoid
(3) Pull-In Winding
(4) Start (S) Terminal
(5) Hold-In Winding
(6) Battery (Bat) Terminal
(7) Key Start Switch
(8) Solenoid Contacts
(9) Motor (Mtr) Terminal
(10) Shift Lever
(11) Field Winding
(12) Pinion Drive
(13) Pinion
(14) Armature
(15) Battery
If a pinion tooth meets a ring gear tooth, the pinion cannot immediately mesh with the ring gear. The solenoid contacts (8) close as the meshing spring is compressed through the shift lever (10). The starting motor is now turned on. The operation turns the pinion (13). The pinion initially meshes with the teeth of the ring gear. The pressure from the meshing spring causes the pinion (13) to fully mesh. The pressure from the meshing spring causes the ring gear to fully mesh.
Full Engagement
(1) Return Spring
(2) Solenoid
(3) Pull-In Winding
(4) Start (S) Terminal
(5) Hold-In Winding
(6) Battery (Bat) Terminal
(7) Key Start Switch
(8) Solenoid Contacts
(9) Motor (Mtr) Terminal
(10) Shift Lever
(11) Field Winding
(12) Pinion Drive
(13) Pinion
(14) Armature
(15) Battery
At the end of solenoid armature travel, solenoid contacts (8) close. This allows full battery voltage to be applied to battery (Bat) terminal (6) and motor (Mtr) terminal (9). The starting motor current energizes the field winding (11). The starting motor current powers the starting motor. Armature (14) now begins to rotate and the helical spline forces the pinion farther into the ring gear until the pinion contacts the stop ring of the armature shaft.
The pull-in winding (3) is turned off when the starting circuit is closed. Hold-in winding (5) remains
energized. The hold-in winding magnetic force is enough to hold the solenoid plunger in the pull-in position until the engine is started.
When the engine starts and the ring gear turns pinion (13) faster than the starting motor, the clutch section of the pinion drive (12) breaks the connection between the pinion and the armature shaft. This prevents damage to the armature from being rotated too fast. The pinion remains meshed with the ring gear while the shift lever (10) is held in the engaged position. The shift lever assembly and pinion drive are returned to the rest position by the return spring (1) only when the key start switch is released. The return spring also keeps the pinion in the rest position until the starting motor is again operated.
Read More:
How DC Alternator Works?
DC Starter Motor Components
Blog.Teknisi
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