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Three phase thyristor rectifier

My name is Sreenivasan. I am doing my Engineering 2nd year.
I have done a project on 3-phase rectifier using thyristors.
When I give its output to a resistive load I get the expected output.
But, when I give its output to a D.C Shunt Motor I am getting a
The problem is: An EMF is generated at output which is greater than
the applied voltage (i.e If I apply 220V from output of rectifier to
motor the voltage across armature is >300V)
How to arrest that??