Car Alternator Circuit
Figure 1 below is a block diagram or a functional diagram of an alternator and its connections to the remainder of the automobile electrical system. I run the fiesta alternator from the flywheel of a 1942 lister dk and the more modern laguna unit from the pulley of a 1945 wolseley wd2.
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Once the vehicle is running pulleys on the running engine rotate a belt connected to the alternator which then causes the internal.
Car alternator circuit. Two of the wedge shaped field poles alternating n and s are visible in the centre and the stationary armature winding is visible at the top and bottom of the opening. This is the most basic way to connect an alternator to make a charging set or to run an inverter from a stationary engine. There is another circuit in the alternator to control the charging system warning lamp that is on the dash. How a car alternator works easy to understand. Or to the ammeter if you car has one.
A cars battery only provides enough power to operate the vehicles starter when starting. A dc motor has a commutator to connect the rotor coils differently as it rotates whereas an alternator has simple slip rings to connect to the rotor coil but offers no switching action. Automobile alternators perform more duties than simply recharging a cars battery. Feel free to surgically remove it just make sure you leave access to the brush terminals so that you can power the field coil with the alternator fully assembled. This circuit if present in the alternator you choose for the experiment is unnecessary and will only impede your study if left in place.
Cut away of an alternator showing the claw pole construction. This wire will be either brown or brown with a colored stripe in a triumph. Charging system wiring diagram amazon printed books https. An alternator could use a permanent magnet rotor but car alternators use a coil to generate the magnetic field. Below schematic illustrates the 1994 honda magna vf750c alternator and charging system circuit and wiring diagram.
Provided the circuit on the wire harness side is normal and there are no loose connections at the connectors inspect the regulatorrectifier unit by measuring the resistance between terminals. A short course on charging systems by charles ofria. The belt and pulley at the right hand end drives the alternator. How to test an alternator testing the voltage regulator diode rectifier and stator duration. This wire connects to the battery either directly or via some connection in the main battery supply circuit.
Both units need the field coils exiting by connecting to a battery first. If the charging system stopped working the batterys charge would soon be depleted leaving the car with a dead battery. Following the figure is a description of the various components that make up an alternator and a description of how each operates to keep the battery charged in your car.
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