When running, this voltage is maintained nearly constant by the voltage regulator, regardless of engine speed.Īs current is consumed, the voltage drops in conformity with the output. The generated voltage increases with engine speed and as soon as the rated level (approximately 12 volts) has been reached, the cutout switch closes and charging of the battery begins.
The generator output is limited by the voltage regulator, which controls the generator field strength. When the generator is driven by the engine, the stator shunt field coils are excited and the current generated in the armature is utilized for the ignition system and charging the battery. When the contacts of either switch (1 or 3) are open, the current flow to the ignition coil (5) is interrupted to stop the engine. When the engine stops, the outward movement of the transmission drive cup cover pushes on the finger of micro-switch (7) closing the switch contacts.
The engine can be stopped by turning the key switch to “OFF” position or by allowing accelerator pedal to come to its full outward position, opening microswitch (3), which opens the ignition circuit. This interrupts the current flow through the starter relay winding causing the relay switch contacts to open, stopping current flow to the starter motor which ceases to operate. This switch is normally closed, however, as the engine starts and operates at driving speed, the drive cup cover moves away from the switch allowing its contacts to open. Micro-switch (7) is mounted in a position so that the operating finger roller touches the transmission drive cup cover. Starter motor now functions to crank the engine. Battery current flows to the starter motor. 50 on the control box, energizing the solenoid coil of the starter switch closing switch contacts. Battery current also flows through micro-switch (7) to terminal No. When the pedal is depressed contact button on microswitch (3), is released, contacts close, turning on ignition circuit. With key switch (1) turned to “ON”, battery current is available at the microswitch (3), which is open until the accelerator pedal is pushed.
These three control switches (1, 3 and 7) are series connected with the battery and solenoid coil of the main starter switch. This circuit is controlled by the key switch (1) and two micro-switches (3 and 7), which operate a solenoid starter switch in the control box (9), which controls the main starter current. When starting the engine, the 6 stator field coils are connected in series with the armature to operate as a series motor.
Mounted on the stator housing are four spring-loaded carbon brushes which contact the armature commutator.Ĭomponents of the control system are the switch box assembly (containing voltage regulator, cutout relay and starter solenoid), two micro-switches (3,7) and a keyswitch (1). Six alternate field pole shoes of the stator are series-wound with heavy gauge wire for starting the other six carry lighter gauge shunt field windings for generating power. Main components of the starter-generator unit are the field stator with 12 radial field coils, and the bell-shaped armature rotor with the commutator formed on its inner vertical face The armature is mounted directly on the engine crankshaft end taper (right side) and rotates at engine speed. Ignition spark is produced by a 12-volt coil through a cam operated circuit breaker with built-in automatic advance mechanism. The Harley Davidson gasoline cart has a 12-volt electrical system utilizing a combination starter motor/generator unit built into the engine crankcase, in conjunction with a control switch-box-regulator unit and a storage battery using a negative grounded system. Wiring for 1963-66 Model D and 1963-68 Model DC