What is meant by "allignment" ?

@zaveri-5TD6Sk • Oct 26, 2024

Oct 26, 2024

1.1K

This term comes into usage whenever an electric motor or generator has to overhauled (dismantled and re-assembled).

now what exactly does this mean ?

i have heard that, the machine will fail to work after re-assembly, if this is not properly taken care of.

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zaveri

@zaveri-5TD6Sk • Dec 7, 2012

ANISH PETER
"alignment" is the positioning of the rotational centers of two or more shafts such that they are co-linear when the machines are under normal operating conditions.

thanks but somehow i am not convinced. can you elaborate, what you just said ?
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zaveri

@zaveri-5TD6Sk • Dec 9, 2012

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any ideas guys ?

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grsalvi

@grsalvi-7IhIh1 • Dec 10, 2012

Alignment simply means the relative position between two parts.
Now in context of Electrical motors (or alternators ), by alignment it means proper arrangement of rotor shaft with respect to stator.(Another issue is shaft misalignment which is already explained above by Anish Peter).

If alignment is not proper ,naturally the rotor will come in contact with stator and cause damage ,noise and other mechanical stresses.
Leave the condition of rotor & stator contact, even small improper alignment can cause a non - uniform air gap between stator and rotor (non-uniform air gap is there in a type of synchronous motor but its due to protruding rotor poles and is by design).
Width of air gap is very important design parameter as it decides flux and armature reaction.
Over all misalignment results into mal-functioning of machine.

Hope that helps .
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Annu1769

@annu1769-j7i367 • Jul 6, 2013

How both the shafts are aligned properly is checked ? What is the acceptance limit of misalignment.
Can anybody provide any literature about alignmnet
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