Common automotive generator malfunctions: 1. Not charging, not charging In addition to the loose and slippery drive belt, it is usually necessary to check that the generator itself is not generating electricity or that the regulator is defective, as well. the charging circuit is short-circuited. 2. The charging current is too low, which is usually caused by insufficient voltage of the generator itself, poor technical condition of the regulator and increased resistance in the charging circuit.
3. The charging current is too large and the car's ammeter pointer deviates to the maximum charging current position; If you are driving at night and the engine speed is high, the instrument lights and indicators will be particularly bright. 4. The charging current is unstable. When the engine is running at a speed above idle speed, the ammeter pointer oscillatesleft and right, indicating intermittent charging (sometimes charging and sometimes not charging). Generally, the voltage across the generator is unstable. . 5. The generator is not producing electricity. The main reasons why the generator does not produce electricity are: short circuit or open circuit of the rectifier diode; field winding short circuit or three-phase stator winding phase short circuit or rotor slip; ring heavily oxidized and dirty, carbon The brush holder is damaged or the carbon brush is stuck in the brush holder. .
Automotive generators can be divided into DC generators and AC generators Since AC generators are superior to DC generators in many aspects, DC generators have been eliminated at the current time. alternators, so how do alternators work? Automotive generators also rely onon the principle of electromagnetic induction. When the external circuit feeds the excitation winding through the brush to generate a magnetic field, and when the rotor rotates, the magnetic flux alternately changes in the stator winding. According to the principle of electromagnetic induction, an alternating induced electromotive force is generated in all three. - stator phase winding. If the stator winding is connected to an electrical load, the motor will produce alternating current. The alternating current will be converted to direct current through the bridge rectifier inside the generator and output from the output terminal. This is how a car's alternator produces electricity.
(Photo/Text/Photo: Luo Ting1) @2019