Danaher Motion SuperDrive ACS24 Series, User Manual

Page: 16 / 99

Overview
26.04.2005
pwm (u)
pwm (v)
pwm (w)
pwm (u)
pwm (v)
pwm (w)
+
B-
U
V W
i sens (u)
i sens (v)
heat sink
temp sens
UPPER
LOWER
G0028.CDR
Figure 5. Power Conversion Section.
Figure 6. Pulse Width Modulation.
During braking, the rotor runs at higher speed than the speed of the synchronous flux vector and
the motor functions as a generator, supplying power to the battery. The change from motor to
generator is smooth and instant when rotor speed exceeds synchronous speed. The AC
SuperDrive supplies a magnetizing current at the proper frequency for optimum regeneration
performance. The generated power is dependent on the slip (which the AC SuperDrive controls).
The transistors functions as a 6-pulse rectifier (see
Figure 7 ), converting the 3-phase AC current
to DC-current that charges the battery.
Item No.
89Y05120A
User's Guide 1.0
16