Looking for a solution to get read of noise caused by 3phase motor/gene​rator working as part of my rig

i wrote a code to measure temp, pressure and RPM of my experiment. the RPM signal input to labview is a puls (open collector) 
as soon as i start my motor (3phase) with a motor drive all my reading start reading rabbish!
i have tried to change the power supply of every thing, covering some cables with aluminum foils, faradey cage, ... but steel no useful measurement.
i a certain speed motor will change over to a generatore and i dont know what will happen to my readings them!
any help will be appriciated!
also if any of you have a proper code reading open collector puls as RPM please post it for me!

When you find the electrical / instrumentation engineer, one of the first things he / she should do is trace all the currents in the system.  Each current source should have its own wire path back to its sink.  That path has to use wire appropriately sized to the current.  Once the paths are identified, separated, and wires sized correctly, you can determine which signals might benefit from isolation.  This is also the time to figure out where to connect shielding.  Foil and Faraday cages will not help you if your problem is poorly configured current paths.
Look at how (physically) close the signal and power wires are to each other.  Shields are more effective if the wires aren't close to each other.  Remember that most shielded wire protects from capacitively coupled noise but does nothing for magnetically coupled noise.  Motors / Generators are magnetic devices and you should expect that kind of noise.
Here are some resources from NI's website.  This is only a start.  Noise isolation and signal integrity is not an exact science.
http://www.ni.com/white-paper/3546/en
http://www.ni.com/white-paper/3035/en
http://digital.ni.com/public.nsf/allkb/4A441BC4E49​541F4862573A000789203
http://www.ni.com/white-paper/5362/en

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