Method for detecting a failure in a three-phase alternator, device for detecting failures and associated computer programme

A device for detecting a failure of a three-phase alternator, said detection device comprising:

• a three-phase rectifier bridge connected to a first phase, second phase, and third phase of said three-phase alternator;
• a summation and subtraction unit adapted for adding a rectified voltage sampled from the first phase to a voltage sampled from the second phase in order to obtain a voltage sum;
• said summation and subtraction unit being adapted for subtracting, from said voltage sum, twice a voltage sampled from said third phase, in order to obtain a voltage difference;
• a window comparator adapted for comparing said voltage difference to a high threshold and to a low threshold;
• and
• a monitoring unit adapted for transmitting a failure signal when said voltage difference is less than the low threshold or when said voltage difference is greater than the high threshold.