Electric motor with spark suppression circuit

摘要

A brush direct current motor has a first connecting portion and a second connecting portion for respectively connecting the positive and negative electrode of a direct current power source, a stator having a number of coils corresponding to N phases, a rotor, a current converting device and a spark suppression circuit. The spark suppression circuit has N branches. Each branch comprises a first diode and a second diode, the cathode of the first diode and the anode of the second diode are respectively connected to the first connecting portion and the second connecting portion, the anode of the first diode and the cathode of the second diode are connected to a corresponding phase.

主权项

1. An electric motor, comprising:
a stator comprising a plurality of coils that correspond to N phases; a rotor comprising a shaft and P poles; a commutator comprising two conductive slip rings, P bars electrically connected to the slip rings, and an insulating body fixed to the shaft and supporting the slip rings and the bars, wherein the bars are equally spaced along the circumferential direction of the commutator; two first brushes respectively arranged to make sliding electrical contact with the first and second slip rings; N second brushes electrically connected to the N phases and arranged to make sliding electrical contact with the bars; and a spark suppression circuit comprising N branches, wherein each branch comprises a first diode and a second diode, the cathode of the first diode being directly connected to the first brush that is arranged to be connected to a positive terminal of a direct current power source, the anode of the second diode being directly connected to the first brush that is arranged to be connected to a negative terminal of the direct current power source, and the anode of the first diode and the cathode of the second diode being connected together and to a corresponding phase.