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Hi:

 

 

  I have a problem about a motor back emf noise, it's been confusing for
weeks. Hope someone could help me.

  Attached is a part of schematics related. Refer to the relay picture,when
it's energized, BB+ receive power from AC line, when it's released, the
surge voltage should be absorbed by RV4. This action is related to motor
turn-on and off.

  If go to motor side picture, BB+ supplies power to the motor, either plus
or minus direction, then go through these drive FETs in the bottom to
circuit ground (differential ground). when drive relays are released, the
motor power is fed back to BB+. The bottom FETs are driven by PWM generated.

 

  The problem is: if we run some big dc motor and press "stop", it simply
slows down to almost 0 speed, the relay "clicks" and goes back turning again
in the same direction, which is not allowed. However, this problem never
happens if we run some smaller motor.Any suggestion on what could have
happened? Thanks.




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