Hi! I am a chemist tasked in setting up a microdiaphragm pump for our experiments. Unfortunately the supplier does not provide installation support. Wondering if you have any idea on what are the required materials we need to purchase to set it up.

Ou setup includes a Brushless DC motor (12-26V) diaphragm pump (4-wire ???) that must be connected to an AC supply with a timer switch. What do I need in setting up the correct electrical connection? Thank you!

 

Welcome to AAC.
Going out on a limb here, but your AC supply; is that the source of the 12-26V DC? You can control your power supply (AC in, DC out) from a simple timer. There's plenty of them on Amazon.

 

It would help if you can give the model number of the brushless motor.

You will require an ac to dc rectifier/regulator and a brushless motor controller.

 

Certainly the amazon customer support group will be able to provide you with MUCH LESS information than Tony did in post #2. If you acquired a complete package that includes the motor and pump assembly as well as the drive package then there is hope that they can work with each other without needing engineering assistance and support.
If this is a university lab project there might even be actual support staff available. If the pieces came with any documentation, we should be able to provide whatever assistance information from whatever information you have.

 

Hello, thanks for the comments. Here's the specifications of the pump and what it looks like.


I've seen some setup where they used cigarette lighter sockets like this:

If I use this, would I still need the ac to dc rectifier/regulator?

This is a personal project that I do in my home lab, but since I am still affiliated to a uni, I could seek some help from our support staff. But the request could take some weeks so I am taking my chance here. Thanks!!!

 

I vaguely recall someone asking maybe a similar question, here in AAC, a long time ago.

 

Using a cigarette-lighter adapter as shown will provide DC for you, as it incorporates necessary rectification and regulation, but you will still need a brushless motor controller. OR change your pump unit for a DC model.

 

OK, this is not a university lab operation. I see FOUR WIRES from the motor on the pump. That tells me that it is not a simple brushed-type motor. It may might be a two-coil stepper motor, in which case it will need a driver circuit, NOT just a DC power supply.
In addition, no matter what type of motor it is, if you want speed control it does not seem like a wall-wart supply would provide that without some in-between control device.
Examining the data sheet image, I see "Integrated brushless DC, 4Wire". That seems to imply that the driver is not included. The Bad News is that BB is totally correct.
IF you are able to exchange it for a two wire version, that may include a driver circuit.

 

've seen some setup where they used cigarette lighter sockets like this:

If I use this, would I still need the ac to dc rectifier/regulator?

Something to consider: The above wall wart may not be powerful enough. Without seeing the characteristics of the source it might be good to 500mA (0.5A). If those are heat sink fins or vents then it might be good to 1A. Here's the important part: How many amps does your current motor require? If you don't have a motor then what ever motor you are considering - you need to take into account the amperage of that motor. If the motor draws 5 amps then you want a power supply that can deliver a minimum of 7.5 amps. 10 amps is better. More than that is overkill and not necessary. But I haven't seen anything showing the amperage requirements of the motor.

 

This is close to what you have:
https://www.manualslib.com/manual/2945230/Knf-Nmp830kpdc-Hp.html?controller=view&page=7#manual
View attachment 357270
You may be able to find more specific information on YOUR motor. This one seems to draw 850mA at 12VDC or 450mA at 24VDC.

Your motor claims to operate on 10 to 26.4VDC. So this manual might not even cover YOUR motor.

 

Found this:
View attachment 357271
Source:
https://www.enapart.com/storage/product_docs/knf/17698/DB_NMP830_EN_28072023.pdf

 

Awe geez! Just noticed you already had that information. Sorry for not having seen that before.

Your power requirements are (obviously) 12 to 24 volts DC and at 500mA (12VDC) or 250mA (24VDC). Just how to wire it - that I can't help with. But to answer your question: "Our setup includes a Brushless DC motor (12-26V) diaphragm pump (4-wire ???) that must be connected to an AC supply with a timer switch. What do I need in setting up the correct electrical connection?" No. The motor must be supplied with Direct Current. If you have a power supply that can deliver 12 or 24 volts DC AND sufficient amperage then that's the way to go. As for timers - there are plenty on Amazon.

 

WHY would a brushless DC motor with an integrated drive have four wires ?
IS there any information attached to the actual motor, such as voltage or current or even polarity?? Or wire identifications??
Next question: Is the TS able to measure the resistance between the wires?? What level of electrical knowledge does the TS posses?? Does the TS have access to an ohmmeter??
Have they tried a web-search based on that series number, or the type number on the motor tag??
Where is the seller listing of the assembly on the internet?? that site might have some useful information accidentally showing.

 

If you look at the TS's motor you see it has four wires. I don't know why or what the extra wires are for. I'm just a basics kind of guy with a little digital experience. But looking at the motor you see largely a plastic body that houses the motor and pump. There is what appears to be an aluminum end cap with the four wires. Perhaps there's some electronics housed in the pump. The pump itself says it's rated for 10 to 26.4 volts. Possibly the extra wires have something to do with what might be an electronics package. If this IS a brushless DC motor then there's certainly some electronics packaged inside either the (what I think is a) heat sink or inside the motor. Regardless of how its truly wired any electronics might surely require some heat management.

 

That end cap is the end of the motor housing, because motors need an exterior magnetic path. And inside a pump is a very poor location for any electronics. So it would normally that the four wires would be one common and three windings for a brushless motor. So an external driver is required. NOT JUST A DC SUPPLY. Probably the online sales sheet did not make that clear. If the seller was amazon I have nothing good to say about it. And many other on-line sellers are no better, as far as honest clear advertizing.

 

PM AC & BLDC motors are principally 3-wire. Is it possible (confirm by testing) that the green wire is GND?

 

Did find one electrical table for a NMP830. White wire may be speed control (0-24VDC). Green is speed output:

EDIT: Found a more accurate table for that model:



https://knf.com/fileadmin/Global_fi...manuals/BA317001-316999_NMP830_HP-EN_0325.pdf

 

PM AC & BLDC motors are principally 3-wire. Is it possible (confirm by testing) that the green wire is GND?

Would a standard VFD have a 3-wire interface? Perhaps that is what is needed. Would red, white for phases, plus black common be standard?

 

A VFD is typically used for AC 3ph induction motors, they do not play well with PM motors, (I have tried it!)
3ph red,blk,white is often used.
The OP states a BLDC and 12v-24v

 

sagor nailed it...