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allenb
09/21/2022 6:56 PM
Freded welcome to HRO! Welcome

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09/16/2022 12:45 AM
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09/10/2022 4:00 PM
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Help! Blower motor control
ACEMBL
In what now seems like a slightly hasty decision I purchased a hand dryer motor and controller for my roaster. It?s an Exel Xlerator, the type that make your hands look like they?re made of putty when drying them. Anyway, on paper it?s just what I need with regards to CFM and static pressure, the only thing is....

1. It stops every thirty seconds
2. There?s an IR sensor that needs to see movement otherwise it locks out the unit thinking there?s an obstruction.

The motor runs three phases (metering shows each to be DC and about 300V) and has some sort of speed sensor circuitry

The control unit does all of the rectifying via kbj2506 and has a dsPIC30F2010 programmable chip to control everything.

I know many of you are far smarter than I?ll ever be so I?m reaching out to see if any of you help me reprogram the chip or point me in the direction of a dummies guide to remove the 30 second timer and IR sensor?

Otherwise, is there a simpler solution for controlling the motor?

[img][/img]
Edited by ACEMBL on 03/19/2021 6:47 AM
 
renatoa
Do you want it just fixed, i.e. run at a fixed speed, or want also speed control ?

How is the three phases connection: star or delta ?
Basically, you should connect the windings as one of the scenarios in the attached picture.
...
...
renatoa attached the following image:
convert-3-phase-motor-to-single-phase.jpg
 
ACEMBL
Hi Renatoa, Thanks for the diagrams. I?ve been using a single phase side channel blower for a while but really wanted the variable speed so I can tune the throw of the beans for different varieties and as they warm up.

How would I identify how the phases are connected? There are three main wires going to the motor windings and five to the sensor on the top.
The usual UVW and they connect back to a chipset that controls the power and switching.

I?d add a picture but I don?t seem to have an option at the moment.
 
renatoa
For a variable speed three phase motor you could look at various VFD open source projects:

https://github.co...ki/OpenVFD
https://hackaday....63-openvfd

There are cheap variable speed boxes on ebay, like these:
https://www.ebay....2845991011
...but no idea if they match your motor and sensor
 
ACEMBL
Thank you for the info, I can instantly see now what on this board does what. I wasn?t far out in my guesstimation. I?ll persevere with the reprogramming route first and if that fails see if I can repurpose many of the components from the board and control it via Arduino.
 
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