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What Causes Low Power Generation in a Car?

1 Answers

DePreston

07/30/25 6:31am

No-load voltage being too high or too low, generator overload causing load current and voltage to exceed rated values, or too low load power factor can all have an impact. Please see below for detailed explanations: 1. No-load voltage too high: Automatic voltage regulator malfunction. No-load exciter field winding current too large. 2. No-load voltage too low: Exciter field winding open circuit. Main generator field winding severely short-circuited. Exciter field winding current too high. 3. Overheating: Generator overload causing load current and voltage to exceed rated values; load power factor too low; rotational speed too low; partial short-circuit in generator windings; ventilation duct blockage. 4. Excessive vibration: Poor alignment with prime mover. Poor rotor dynamic balance, occurring after rotor rewinding.

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