What can burn out a 3 phase motor ? Can turning it on and off be effective?

Thread Starter

dashhossein

Joined Jul 30, 2020
41
Hello everyone ...
For a project, I want to make an escalator smart with a number of PIR sensors
So that the escalator turns off after one minute of not using it
And for example, turn on 20 seconds later
If this cycle continues, can it damage the engine?
The specifications of this motor are 9 kW and 20 amps
The starting current is 22 amps and after stabilization is 8 amps.
In general, what can cause damage to the engine?
 

MaxHeadRoom

Joined Jul 18, 2013
21,984
Continuous stop starting of a 3ph motor can cause (over)heating especially with a permanent load.
You would need to monitor this closely.
A clutch system may be one answer?
Max.
 

andrewmm

Joined Feb 25, 2011
894
Many escalators and moving walkways I see at airports have a similar system, when I come back late at night everything is off till you approach,

So yes it can be done,

I'd suggest a bit of circuit monitoring is need,

Question is , if were worried about heat, does the motor cool down when its on ?
I assume it must do, otherwise you have a motor that can only run for a limited time anyway.

If so , then don't stop the motor if its to hot,
 

Thread Starter

dashhossein

Joined Jul 30, 2020
41
Many escalators and moving walkways I see at airports have a similar system, when I come back late at night everything is off till you approach,

So yes it can be done,

I'd suggest a bit of circuit monitoring is need,

Question is , if were worried about heat, does the motor cool down when its on ?
I assume it must do, otherwise you have a motor that can only run for a limited time anyway.

If so , then don't stop the motor if its to hot,
the motor are always on
yes i need a real monitor for that
 
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