How to determin no of poles on Motor?

[wazzer]

Hi guys

Is it possible to count the number of magnetic poles in a motor with out taking it apart?

When you turn a motor by hand you can feel the pull of the magnets as a sort of "notch" by counting how many "notches" per revolution is it possible to determine the no of poles?

Many thanks for any help with this

Ben

[fly_boy99]

It's all relative to how much air gap there is between the magnets and your stator head width.

The easiest way is to open her up and find out.

;)

[Ron van Sommeren]

Number of notches is not a good indicator.

[wazzer]

Ok so if i open them up

is the number of magnets equal to the number of poles?

[BeavrdamElectric]

Ok so if i open them up

is the number of magnets equal to the number of poles?Not always. Sometimes 2 or 3 (or more) magnets are used as one pole. They should be grouped together if there are any gaps (not 100% coverage).

You may be able to tell on outrunners without disassembling the motor by running a magnet around the outside of the flux ring and seeing where it attracts and repels.

Good Luck!

[Ron H]

You can also use a very strong magnet on the outside of the can. It will pull constantly to the can and one pole, but be repelled as it passes the opposite pole. /2 for pole count.