Car Alternator: Components, Function, and Types
What is an Alternator?
An alternator is an electric power generator that converts mechanical energy it receives from its shaft into electrical energy. In addition to charging the battery, it provides power to different components of the car. It provides current, but establishing the alternating magnetic core is the bridge rectifier with diodes rectifiers is responsible for transforming it into continuous current.
Alternator Parts
- Pulley: Receives the rotation of the engine through the belt.
- Fan: Cools
Precision Measurement Tools and Techniques in Engineering
N.P.L. Flatness Interferometer
The National Physical Laboratory (N.P.L.) Flatness Interferometer is an optical instrument used to measure the flatness of surfaces with high precision.
Principle
It uses the principle of light wave interference. When monochromatic light is directed on a flat reference surface and the surface to be tested, the light waves interfere, creating a pattern. Flat surfaces produce straight fringes, while deviations create curved fringes.
Construction and Working
- Consists of a
Aircraft Electrical Systems: Maintenance and Troubleshooting
1. Resistance Measurement
A resistance measurement of 0.005 ohms from a ground point of a battery to the ground terminal or ground point of a generator of an electrical device is considered satisfactory.
2. Ammeter Overload
An ammeter can be “redlined” at 100% of the alternator rating and is referred to as overload.
3. Electrical Connector Pin Side
The negative (-) connection is the pin side of an AN or MS electrical connector.
4. Bonding Terminals to Terminal Block (No Bus Bar)
When using a stud/nut combination
Read MoreElectrical Machines: Transformers, Circuits, and Magnetic Fields
Electrical Machines
An electrical machine is a device that converts electrical energy into other forms of energy, or changes the power but with a different presentation. This energy goes through a period of storage in a magnetic field. They are divided into generators, motors, and transformers.
Induction
Induction is the phenomenon that causes the production of an electromotive force (EMF) in a medium or body exposed to a variable magnetic field, or in a movable medium relative to a static magnetic
Read MoreMetal and Non-Metal Materials: Properties and Treatments
Metal and Non-Metal Materials
Metals
Corrosion, especially in metals like iron exposed to seawater, is a significant challenge. Different types of corrosion include:
- Intergranular corrosion: Occurs at the grain boundaries of the metal, leading to a loss of cohesion and internal destruction.
Ceramics
Crystalline Ceramics
Derived from fused silica, these ceramics possess high mechanical strength and temperature resistance. They are used in motors, infrared radiators, and bearings.
Non-Crystalline Ceramics
Amorphous
Read MoreAlternator Component Inspection: Rotor, Stator, Diodes & Brushes
Alternator Component Inspection
Essential checks before testing: Ensure all components are free from clay, dust, and grease. Conduct visual, mechanical, and electrical inspections.
Rotor Inspection
Visual and Mechanical: Verify the rotor, shaft, and collector rings are in good condition, without signs of damage, wear, or excessive play. The rings should have a smooth surface, free from scratches or cracks. If any anomalies are found, machine the rotor to a maximum eccentricity of 0.05mm, adhering to
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