Hollow shaft encoder

[vikash23]

Hi,

I am looking for a hollow encoder .

Please see the attached image.



It'a a pump and I am trying to place the pump back to back so one is driver and other is a generator.

I need to measure the speed of the shaft always and I am looking for a speed measurement device like encoder or similar.

I have found the following hollow encoder but our shaft size is 10mm and the shaft size of this is only 6mm.

https://ecatalog.dynapar.com/downloads/F10_DS_702453_2_.pdf

Can any one please recommend me a cheap hollow encoder to measure the speed. ?

Or even if you can recommend a motor with encoder attached to the other side which can give a rpm min of 6000 is also ok.

The motor that comes with the encoder should be capable to 400W and must be less than £50

 

[KlausST]

Hi,

there are a lot of encoders. Hollow shaft and not hollow.
One manufacturer with many different types is: https://www.kuebler.com/usa/index.html
--> With an internet search you will find many other manufacturers.

And you will find any mechanical adaperts to adjust for different shaft diameters.
--> The encoder manufacturers will help you with this.

But you say "shaft speed measurement"...
(you didn´t give any specifcations about RPM range, resolution, precision, measurement interval...thus we need to guess)
I´d say there is no need for a true encoder.
Maybe a simple reflective sensor and some (painted) markings on your coupling device will do the job.

Klaus

 

[vikash23]

Hi,

I also had the idea initially but the reason I am looking for an encoder is because it's rugged and I dont want to break it any time as it's going to customers hands.

I searched for some reflective sensor and found the following

https://uk.rs-online.com/web/p/reflective-optical-sensors/8203181/

https://uk.rs-online.com/web/p/reflective-optical-sensors/1700731/

But how will I know what rpm it will measure ?

Our requirement is 6000rpm max . Resolution can be 10%. Not sure about the precision and measurement interval.

Or can i use some thing like this

**broken link removed**

https://uk.farnell.com/broadcom-lim...r-8mm/dp/1161087?MER=bn_search_1TP_SearchNB_1

 

[KlausST]

Hi,

I recommend to use one with timing specification in the datasheet.

You may also have a look at these: https://uk.rs-online.com/web/c/disp...s-photointerrupters/slotted-optical-switches/

Our requirement is 6000rpm max . Resolution can be 10%. Not sure about the precision and measurement interval.

10% resolution, this is 600RPM ... you are not interested in better resolution, then precision shouldn't be a problem either.

measurement interval:
I recommend to decide a range of value.
It surely depends on how you want to process the RPM value.
I designed applications with a processing rate of 1.6ms up to 15 minutes.

Just to be displayed: I recommend 300ms ... 1000ms

Klaus