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Topic: could someone help me integrate a shunt (Read 4 times) previous topic - next topic

dc42

#10
Feb 21, 2012, 07:16 pm Last Edit: Feb 21, 2012, 07:24 pm by dc42 Reason: 1
I'm sure Mike will reply in due course; but I use Farnell, RS, Rapid Online and Proto-Pic. I generally find that Farnell has the widest range and is easiest to search, but occasionally I find that RS has better prices or can supply something that Farnell cannot. Rapid has a very limited range, but their prices for small quantities are often better than Farnell. Proto-Pic holds stock of some useful SparkFun components such as SMD breakout boards.

Just occasionally I want something that I can't find in the UK, and then I usually use Digikey.
Formal verification of safety-critical software, software development, and electronic design and prototyping. See http://www.eschertech.com. Please do not ask for unpaid help via PM, use the forum.

overclock

just found an alright deal from ebay, its a bit more expensive but alot easier than dealing with the guys at the warehouse,

http://www.ebay.co.uk/itm/150653948018?ssPageName=STRK:MEWNX:IT&_trksid=p3984.m1497.l2649#ht_725wt_1163

Not quite as high rating as i wanted, but hey 200A was 100 over what i needed lol. I will eventually buy another three of the 100A units to monitor 3 phases of my bldc motor.

overclock

Hi I've just received the sensor but the only access to the net is my phone, does anyone know what I shoud map the input values to get a 1A resolution, lol I need an ammeter.
Its the 150A version, just building the wiring harness if anyone can give me an idea what input voltage per A I should get would be awesome.
cheers, neo

retrolefty

Quote
I will eventually buy another three of the 100A units to monitor 3 phases of my bldc motor.


You do realize that making a current measurements from a BLDC motor winding is different then making a simple DC current reading as the motor windings are being driven with high current PWM pulses, so somewhere in either hardware after the hall effect sensor or in software you will have to 'filter' the measurement value over time to get a average current value for a averaged period of time.


dc42

With Vcc = 5v the output at pin 3 has a sensitivity of 13.3 mV per amp. At zero current the offset of the output from the ideal value of 0.5 Vcc may be up to +/- 5mv at 25C.
Formal verification of safety-critical software, software development, and electronic design and prototyping. See http://www.eschertech.com. Please do not ask for unpaid help via PM, use the forum.

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