How to detect when a 3-phase motor is running?

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i try come arduino programming.

i have 3 phase motor 220v, running in our farm. it's used pump water.

i add simple system track when motor has started run , when stopped.

but how detect it? have tried non-invasive sct-013 device think don't have enough skills , maybe not working because 3 phases. don't want open motor , things inside because cause problems warranty.

edit: continue non-invasive current sensors

two ways - current sensor on 1 of phases, or rotation sensor on shaft.
perhaps disk mounted on end of shaft, magnet on it. everytime magnet passes hall sensor
http://www.digikey.com/product-search/en/sensors-transducers/magnetic-sensors-hall-effect-digital-switch-linear-compass-ics/1967232?k=magnet%20sensor
a pulse created. no pulses, no rotation.


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