Speed control of DC Series motor
The speed control of DC series motor by using chopper is shown in the figure A. This speed control is achieved through constant frequency control or variable frequency control.
When chopper CH is switched on, the DC
motor gets input supply voltage Vdc. The DC
motor does not get any voltage when chopper CH is switched off. The
load current completes its path through freewheeling
diode or we can say that stored energy of inductor dissipates in the
freewheeling diode during chopper turn off time.
Output voltage across DC series motor
The average output voltage across
load is
VO = [ TON / ( TON + TOFF )
] Vdc
=
( TON / T )Vdc
VO = KVdc
Where K = Duty Cycle
The
voltage across load can be adjusted to any value by switching chopper with
suitable time interval.
Speed control of DC Series motor by DC Chopper circuit diagram
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