Electric motor

An electric motor comprising:

• a stator including a stator core with a winding wound around the stator core;
• a rotor facing the stator and including a rotating body and a shaft;
• a pair of bearings each including an inner ring and an outer ring and supporting the shaft with the inner ring;
• a pair of brackets, one of the pair of brackets fixing the outer ring of one of the pair of bearings and another of the pair of brackets fixing the outer ring of another of the pair of bearings;
• a conductor that electrically connects the outer ring of the one of the pair of bearings and the outer ring of the other of the pair of bearings or the stator core;
• a current detector that detects a discharge current flowing through the conductor accompanying discharge in the pair of bearings;
• and
• a counter that counts a number of times of detection of the discharge current based on a detection value of the current detector.

An electric motor comprising:

• a stator including a stator core with a winding wound around the stator core;
• a rotor facing the stator and including a rotating body and a shaft;
• a pair of bearings each including an inner ring and an outer ring and supporting the shaft with the inner ring;
• a pair of brackets, one of the pair of brackets fixing the outer ring of one of the pair of bearings and another of the pair of brackets fixing the outer ring of another of the pair of bearings;
• a conductor that electrically connects the outer ring of the one of the pair of bearings and the outer ring of the other of the pair of bearings or the stator core;
• a current detector that detects a discharge current flowing through the conductor accompanying discharge in the pair of bearings;
• and
• a counter that counts a number of times of detection of the discharge current based on a detection value of the current detector, the counter integrating a product of a coefficient having a magnitude proportional to a magnitude of the discharge current and a predetermined constant when counting the number of times of detection.