The generator is the powerhouse of your car. When the engine is running, it provides all electrical units with current and charges the battery
In the car, depending on the engine model and equipment, an alternator works.
Accessories determine whether the alternator is driven by a V-belt or V-belt.
Since the battery must be charged with DC current, the semiconductor diodes take care of rectifying the AC current.
These diodes are very sensitive to high voltage. The faster the generator rotor rotates, the higher the voltage rises.
The current consumers in the car will not withstand such ups and downs for long. Therefore, there is a voltage regulator that limits the voltage and at the same time prevents the battery from being overcharged.
Let's consider the defects that may occur during the operation of the generator:
When the engine is running at medium speed, the voltage indicator shows below 12 V:
- Faulty voltage regulator
Replace voltage regulator
- The drive belt is loose
Tighten the belt
- Broken wires from <+> or <W>
- Missing or unreliable contact between brushes and slip rings
Clean the brush holder from dirt, check the force of the brush springs, clean or grind slip rings
- Open excitation circuit
Repair the open circuit, especially carefully check the soldering points of the excitation coil leads to the slip rings and the serviceability of the coil leads
- Interturn short circuit or open circuit in one of the phases of the stator winding of the generator
Disassemble the generator, check the stator winding for open and short circuits
Replace a stator with a defective winding
- Failure of one of the diodes of the rectifier unit
Check the diodes with instruments or a test lamp
Replace the block with faulty diodes
Quick wear of brushes and slip rings:
- Increased slip ring runout
Turn and grind slip rings
- Oil getting on slip rings
Wipe slip rings and brushes with a cloth soaked in gasoline
- Increased or reduced brush spring pressure
Check brush spring pressure
Increased generator noise:
- Insufficient amount of grease in the bearings
- Rotor touching the starter poles
Replace generator cover
- Bearing wear
- Bearing seizing
- Development of a bearing seat
Replace generator cover
- The tightening screws of the generator covers have loosened
Tighten the clamping screws with a torque of 0.5 kgf.m
Breakage of the bracket and paws for fastening the generator. Frequent loosening of the generator:
- Incorrect installation of the generator on the brackets
- Increased pulley or rotor imbalance
Check dynamic balance of pulley and rotor.
If the unbalance exceeds 10 gsm, balance the parts
- Increased motor imbalance
Check engine dynamic balancing