Can a Car Run Normally with a Faulty Alternator?
1 Answers
Can a Car Run Normally with a Faulty Alternator? A car can run normally with a faulty alternator. Below is an analysis of the causes of alternator failure: 1. Loss or Weakness of Alternator Core Residual Magnetism: Newly installed units may experience loss or weakening of residual magnetism in the alternator core due to long-distance transportation vibrations or prolonged storage, resulting in the disappearance of residual magnetism voltage or values lower than normal (residual line voltage less than 10V, residual phase voltage less than 6V). Since the stators and rotors of synchronous alternators and the stators and rotors of AC exciters are usually made of 1~1.5mm thick silicon steel sheets stacked together, residual magnetism can easily disappear or weaken after excitation due to vibrations. 2. Incorrect Wiring of the Excitation Circuit: During alternator maintenance, careless reversal of the polarity of the excitation winding can cause the magnetic field generated by the excitation current to oppose and cancel out the residual magnetism, leading to its disappearance. Additionally, during maintenance, failure to pay attention to polarity when measuring the DC resistance of the excitation winding or testing the automatic voltage regulator (AVR) with DC current applied to the excitation winding can also result in the loss of core residual magnetism. 3. Open Circuit in the Excitation Circuit: Poor electrical contact in the alternator's excitation circuit, loose connections of electrical components, or broken wires can interrupt the circuit, leaving the AC alternator's excitation winding without excitation current.
