Audi A3

Since 1997 of release

Repair and car operation

Audi A3
+ The maintenance instruction
+ Current leaving and service
+ The engine
+ Systems of cooling, heating
+ The power supply system and release of the fulfilled gases
- Engine electric equipment
   + System of electronic control by ignition and injection
   - Charge and start systems
      The storage battery
      Removal and installation of the storage battery
      Check of the storage battery
      The generator - the general data and security measures
      Check of the established generator
      Removal and generator installation
      Check and replacement of brushes of the generator and pressure regulator
      Starter - the general data
      Check of system of start of the engine
      Removal and starter installation
      Check, removal and installation of the traction relay of a starter
+ Manual box of a gear change
+ Automatic transmission and models with a full drive
+ Coupling and power shafts
+ Brake system
+ Suspension bracket and steering
+ Body
+ Onboard electric equipment
+ Electroschemes

The generator - the general data and security measures


In the car the alternating current generator is established. At installation of the additional electric equipment check up, that capacities of the generator was enough for a food of this equipment.

The generator drive is carried out клиновым by a belt from a cranked shaft of the engine.

The generator represents the three-phase synchronous electric car with electromagnetic excitation. For transformation of an alternating current in constant the rectifier is built in the generator on diodes. Pressure is regulated by the built in microelectronic regulator of pressure.

At work of the generator the electric current proceeding on a winding of excitation, creates a magnetic stream round rotor poles. At rotor rotation under each tooth статора passes that southern northern pole of a rotor and the working magnetic stream passing through teeth статора, varies on size and pressure. This variable magnetic stream creates in a winding статора electromotive power. The klinoobraznaja form of polar tips of a rotor is picked up in such a manner that allows to receive the form of curve electromotive power close to the sinusoidal.

At high frequency of rotation of a rotor of the generator when pressure of the generator becomes more than 13.6 – 14.6 In, a regulator pressure is locked also a current through a winding of excitation does not pass. Pressure of the generator falls, the regulator opens and again passes a current through an excitation winding. The above frequency of rotation of a rotor of the generator, the is more time of a closed condition of a regulator, hence, that pressure on a generator exit more strongly decreases. Process of lock-out and regulator unlocking occurs to high frequency, therefore pressure fluctuations on a generator exit are not appreciable, and it is almost possible to consider to its constants supported at level of Century

Before to make any works on gymnastics system, it is necessary to familiarise with following security measures:

1. Never disconnect the battery or a pressure regulator when the engine and the generator work.
2. Never close the plug of excitation of the generator or the cable fixed on it on weight.
3. Never confuse wires of a regulator of pressure.
4. Never include a pressure regulator if it is connected to weight (instant damage).
5. Never remove the generator if the battery is not disconnected from a contour.
6. At battery installation watch, that the minus plug was connected to weight.
7. Never use the indicator of pressure which is connected directly in a household network (110 or 220). Use only the indicator for 12 Century
8. Do not check diodes giving of pressure more than 12 In or a megaohmmeter as it has too high pressure for diodes and they at check will be punched (there will be a short circuit). At check of isolation of electroconducting by a megaohmmeter it is necessary to disconnect all wires from the generator.
9. If the battery is charged in the established condition зарядным by the device, both cables of the battery should be disconnected. The positive plug зарядного devices to connect to the positive plug of the battery, and the negative plug зарядного devices with отрица
10. Disconnect all wires from the generator and from the accumulator at electric welding of any details of a body.
11. Check chains and knots of an electric equipment and eliminate malfunctions at the idle engine and the disconnected storage battery.
12. Wrong connection of wires leads to destruction of the rectifier and a pressure regulator.

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