34
MicroController Control System Systems Operation
When the drive MOSFET TD is ON, battery current
flows through the armature windings of the drive motor
and a magnetic field is created around the windings.
When the TD is turned OFF battery current through the
windings stops and the magnetic field collapses. This
collapsing magnetic field induces current which is
used to power the drive motor while the TD is OFF
(during pulsing). Induced current flows from the
Armature windings through the direction contactor tip,
the Shunt, Field, DF, the regen contactor tip and the
direction contactor tip back to the Armature windings.
Because of this, the average drive motor armature
current will be greater than the average battery
current. Refer to following Average Current Flow
chart.
Flyback Circuit
Flyback Circuit
To Next Page
