Hello all,
At work we have large 277kW brushed DC motors for traction purpose (four per vehicle).
Under powering and braking (regenerative braking is used) the tone of the motor ascends and descends respectively but is largely silent during coasting. I assumed that the noise came from brush/commutator interaction but I would still expect mechanical interaction, at least, during coasting.
Can anyone suggest where the noise is coming from?
Kind regards,
Aidan.
At work we have large 277kW brushed DC motors for traction purpose (four per vehicle).
Under powering and braking (regenerative braking is used) the tone of the motor ascends and descends respectively but is largely silent during coasting. I assumed that the noise came from brush/commutator interaction but I would still expect mechanical interaction, at least, during coasting.
Can anyone suggest where the noise is coming from?
Kind regards,
Aidan.