Speed Control of DC Series Motor By Chopper

• 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 V_dc. 
• 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.
• The average output voltage across load is

                         V_O = [ T_ON / ( T_ON + T_OFF ) ] V_dc

                              = ( T_ON / T )V_dc 

                        V_O = KV_dc

• The voltage across load can be adjusted to any value by switching chopper with suitable time interval.         

SPEED CONTROL OF DC SERIES MOTOR BY

 CHOPPER DRAWING.PDF

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