# How to determine with DMM which one is the start winding & which one is run winding

1. ## How to determine with DMM which one is the start winding & which one is run winding

How to determine with DMM which one is the start winding & which one is run winding in a single phase AC motor ?

Where to connect the capacitor ?

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2. ## Re: How to determine with DMM which one is the start winding & which one is run windi

As far as i know ..... run windings have relatively least resistance as compared to start windings ....

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3. ## Re: How to determine with DMM which one is the start winding & which one is run windi

The start winding has a high resistance compared to the run winding
Its best to measure the ohms with a analog multimeter
The capacitor will be connected in series with the start winding

4. ## Re: How to determine with DMM which one is the start winding & which one is run windi

What is centrifugal switch ? why its used here ?
Where to connect / apply phase & where to neutral ?

5. ## Re: How to determine with DMM which one is the start winding & which one is run windi

a centrifugal switch is operated by rotational force.
it will be in closed position at start of rotation and until a set speed is reached.
beyond which , it will open.
the centrifugal switch is connected to aux wndg circuit.
So that , aux wndg will be connected at satart. when motor is reaching the full speed it will be cut from supply by centrifugal switch.
you can refer the diagram , attached in the earlier message.

6. ## Re: How to determine with DMM which one is the start winding & which one is run windi

if we don't use the centrifugal switch then what might happen ?
where must be the neutral & phase connected ?

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7. ## Re: How to determine with DMM which one is the start winding & which one is run windi

Originally Posted by munzir
if we don't use the centrifugal switch then what might happen ?
then it will be classified as 'capacitor run' motor type.

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8. ## Re: How to determine with DMM which one is the start winding & which one is run windi

& with centrifugal switch what type of motor it would be ?

9. ## Re: How to determine with DMM which one is the start winding & which one is run windi

Originally Posted by munzir
& with centrifugal switch what type of motor it would be ?
capacitor -start motor type.

10. ## Re: How to determine with DMM which one is the start winding & which one is run windi

difference between capacitor start motor & capacitor run motor ?

which one is used in fans ?

11. ## Re: How to determine with DMM which one is the start winding & which one is run windi

capacitor run.

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12. ## Re: How to determine with DMM which one is the start winding & which one is run windi

what's the difference between these two ?

can we interchange capacitor run motor with capacitor start motor ?

13. ## Re: How to determine with DMM which one is the start winding & which one is run windi

if those two satisfies the starting torque , then yes.

14. ## Re: How to determine with DMM which one is the start winding & which one is run windi

how can we compare or can check whether they're satisfying the starting torque ?

15. ## Re: How to determine with DMM which one is the start winding & which one is run windi

first the HPs and rpms should satisfy. from the specification of the two motors , starting torque is to be satisfied.

16. ## Re: How to determine with DMM which one is the start winding & which one is run windi

how to satisfy the starting torque ?

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