voltage and rpm.. need some help.

[CM9000]

cant think today.. this is just for tripping relays. so mathematically I need a straight answer that for some reason I cant figure out.

so.. 3,750rpm = 10v.

375rpm = 1v

1,000rpm =2.667v (rounded up)

2,650rpm= 7.067v (rounded up)

300rpm= what freakin voltage I have no clue.

[svt923]

Originally Posted by CM9000

cant think today.. this is just for tripping relays. so mathematically I need a straight answer that for some reason I cant figure out.

so.. 3,750rpm = 10v.

375rpm = 1v

1,000rpm =2.667v (rounded up)

2,650rpm= 7.067v (rounded up)

300rpm= what freakin voltage I have no clue.

One of the few things I remember from taking chemistry for 2 semesters in undergrad.

375 rpm / 1V = 300 rpm / #V

#V = (300 rpm * 1V) / 375 rpm

#V = .8V

[CM9000]

thanks. helps heaps.

[wings_of_fire]

Originally Posted by svt923

One of the few things I remember from taking chemistry for 2 semesters in undergrad.

375 rpm / 1V = 300 rpm / #V

#V = (300 rpm * 1V) / 375 rpm

#V = .8V

Maths Lesson :- Ratio and Proportion

[BigSki]

Good gawd I had to think again... I struggled so hard with this simple math when I went back to college a few years ago. I finally got the answer but I had to lay out the equation line by line to get it.

375 rpm/1v = 300 rpm/ nV

Isolate the nV, so 1/300 ÷ 3.75/1 = 300/nV ÷ 1/300. The 300 cancels on the right side, so you have:

375/300= 1/v

1.25/1 = 1/v

Isolate v by reciprocating each side of the equation

1/1.25 = v

.8 =v

Please tell me that I'm halfway remembering this correctly !

[CM9000]

we got it figured out. setting the api was time consuming for the 2650 rpm relay. but now that I have it all written down, I shouldn't have this problem again! lol

[CM9000]

Had to come back to this one! yikes.. office got re-arranged and the new prints are missing.