Modern
train traction systems use high-speed switching CM300DY-24H in main circuits.
High-speed switching reduces electromagnetic noise generated by the main motor
and improves the efficiency of energy conversion. For the inverter control
system, vector control is employed to control the torque current component and
the exciting current component separately, which are output to the induction
motor. Since vector control ensures high-speed torque control, it is also
applied to slip-slide control to improve adhesion force. The maintenance work
for contacts and pneumatic parts can be eliminated by replacing mechanical
contacts in each unit with electronic contacts and by changing the pneumatic
operation system to an electromagnetic one.
Dynamic
braking requires two components: the factory installed brake chopper and the
external brake resistor. The brake chopper consists of an IGBT assembly and
logic function that is factory mounted internally to the adjustable frequency
drive (AFD). CM300DY-24H is a very suitable insulated gate biopolar transistor
for using in the dynamic braking choppers. The chopper controls the DC link
voltage by connecting the brake resistor across the link when the voltage
reaches a predetermined level, dissipating the excessive energy in the brake
resistor. The brake chopper size is fixed by the drive rating. The brake
resistor is selected on the basis of the AFD rating, the magnitude of the
energy to be dissipated, and the braking duty cycle.
You
can buy CM300DY-24H from here.
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