- Joined Apr 2, 2007
i need to know why exactly does torque remains constant (or is proportional)
to V/Hz ratio?
to V/Hz ratio?
Power dissipated is directly releated by the loading. If there is more load, the motor will turn slower and the back EMF will be reduced and therefore the applied voltage doesn't have as much reverse voltage holding it back. This will cause a current increase on the input until the system stabilizes back near the original frequency but at a higher power dissipation. It also depends on whether you are talking about a synchronous motor or and inductance motor which is torque regulated through it's slip speed.thanks for the reply,
i m consfused
for more voltage the current shud decrease for same voltage (ac motors are like transformers)
isnt this why undervoltages are said to be dangerous since current draw increases IIRC.
but may be the load isnt constant in my case only torque is constant.
and what about frequency?
i was thinking along the lines that
speed prop to frequency
power prop to voltage?????????????
but my books tell me
power prop to sq (V)
and torque pro to sq(V) / speed.
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