Calculation of numbers of consecutive starts 1

[Schwatzernov]

Hi,

I would like to know how to calculate the numbers of consecutive starts of motor. Is there any publication telling about this ?

As I know, numbers of consecutive starts depends on mechanical drive moment of inertia. The more mechanical drive moment of inertia, the less numbers of consecutive starts of the motor.

Thank your,

 

[rhatcher]

The most reliable source for this information is the motor manufacturer or the manufacturer of the equipment that the motor is connected to.

 

[electricpete]

There is some info here:
faq237-1285
For NEMA frame (small / medium) motors, the 1st linke provides a useful table.

For large motors, OEM info is essential as Ray said. The 2nd link provides only general discussion.

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(2B)+(2B)' ?

 

[edison123]

Nice links, pete.

Muthu

http://www.edison.co.in

 

[starkopete]

This one is for larger motors:

 

[starkopete]

and this one is for NEMA frame:

 

[starkopete]

I'll try that last one again:

 

[dpc]

numbers of consecutive starts depends on mechanical drive moment of inertia

That may be a factor, but the limiting factor is the temperature inside the motor. Even with nothing connected to the motor, the number of starts is still limited.

David Castor

http://www.cvoes.com