Glossary of Motor Terms

Flyback diode

In a three-phase inverter, a bridge circuit is configured by six rectifying diodes. This is a 3-phase full-wave rectification circuit and it causes the current due to the back-emf of the motor winding to fly back to the DC side. In fig. (a), the resistor R is placed on the DC side, and this is used as a feedback path. Figure (b) illustrates the appearance of pulsating DC voltage across the resistor R, through the two diodes in the path with the highest back emf (eAeB), (eBeC), (eCeA) .


Three-phase rectifier circuit constructed in an inverter. Two of six diodes are conducting a current. The highest back-emf of (eAeB), (eBeC), (eCeA) supplies current to R via two of the six diodes.

Term List (F)

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