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Many of the PowrUps
regens actually position the motor in the center of a full wave center
tapped transformer bridge (not a DC H-bridge) so that as the motor
loads vary, the motor's back EMF is easily and efficiently returned
to the AC line and not left trapped in expensive DC switching elements
or a DC power supply. This architecture thermally extends the life
of the drive significantly, and permits instant motor reversal at
any speed or load without the risk of damage to the drive's switching
components. Where H-bridge switching elements must be verified off
before reversing motor direction, thyristor elements self-protect
and self commutate in an on-on state, making both instantaneous reverse
and regenerative braking not only viable, but highly reliable. |
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