Where to find motors in Australia? - Page 1
Forum section: electronics / general

author: rthorntn
author_rank: Frequent Contributor
timestamp: October 08, 2019, 05:18:03 am
content: Hi,Please help.I'm not having much luck on google, I need a brushless motor (that I can get here in Australia) that goes up to 3000rpm to drive an aluminium centrifugal fan blade (118mm diameter, 30mm height, 100g weight) the blade has an opening for a 6mm shaft.I want to control the speed with an MCU, the motor input voltage is not important, I can provide it any voltage.Budget is around $50.Thanks for looking.Richard

author: senso
author_rank: Frequent Contributor
timestamp: October 08, 2019, 09:58:14 am
content: Hobbyking?Grab a brushless motor and the respective ESC to power it, them its just a matter of sending PPM pulses with a micro-controller.

author: beanflying
author_rank: Super Contributor
timestamp: October 08, 2019, 11:24:50 am
content: Given the cantilevered weight of the fan you will want to go larger than smaller for mechanical reasons.If you finish up going for an outrunner make sure the rotor be adjusted to offset the fan (reversible shaft). So you finish up Fan, Mount then off the back is the Rotor. Rough idea look for something 500kV (RPM/Volt) and down so you can run voltages of at least 6-7V any higher and the speed regulation won't be as easy.I have some good quality new old stock here but Hobbyking will be cheaper.This will get you started on narrowing down the motorshttps://hobbyking.com/en_us/power-systems/electric-motors/brushless-motors.html#q=&idx=hbk_live_magento_en_us_products&dFR%5Bwarehouses%5D%5B0%5D=Global&dFR%5Bwarehouses%5D%5B1%5D=AUS&dFR%5Bwarehouses_stock_data%5D%5B0%5D=Global%7C1&dFR%5Bwarehouses_stock_data%5D%5B1%5D=Global%7C2&dFR%5Bwarehouses_stock_data%5D%5B2%5D=Global%7C3&dFR%5Bwarehouses_stock_data%5D%5B3%5D=AUS%7C1&dFR%5Bwarehouses_stock_data%5D%5B4%5D=AUS%7C2&dFR%5Bwarehouses_stock_data%5D%5B5%5D=AUS%7C3&hFR%5Bcategories.level0%5D%5B0%5D=Power%20Systems%20%2F%2F%2F%20Electric%20Motors%20%2F%2F%2F%20Brushless%20Motors&nR%5Bkv%5D%5B%3C%3D%5D%5B0%5D=517&is_v=1

author: rthorntn
author_rank: Frequent Contributor
timestamp: October 08, 2019, 11:36:16 am
content: Thanks all, I had come to this one:https://hobbyking.com/en_us/propdrive-v2-5060-270kv-brushless-outrunner-motor.htmlI'm not sure what "rotor be adjusted to offset the fan (reversible shaft)" means, does the above have a reversible shaft?What sort of ESC would I need?What AC/DC PSU would I use (Volts/Amps) to run this?

author: beanflying
author_rank: Super Contributor
timestamp: October 08, 2019, 11:42:03 am
content: That motor you linked to is set up as I described. The Mount goes on the front (looking at the pic) and then the prop adapter in front of that. The section closest in the pic is the Rotor. What this means is the Rotor is behind the bearing so your Fan will help balance it.The other option for example would see you with the Rotor and fan cantilevered off the bearing which is a bad idea.This one without checking the sheet for it most likely can be reversed by backing of the setscrews but as standard is cantilevered as above.https://hobbyking.com/en_us/turnigy-g46-brushless-outrunner-420kv-46-glow.html

author: beanflying
author_rank: Super Contributor
timestamp: October 08, 2019, 11:44:16 am
content: Re current how long is a piece of string as your fan is a complete unknown but at a guess if you go circa 500kV you will want 7-8V (3500-4000 No Load RPM) @ 2-4A but the current is a complete guess.If you go 300kV then 11-12V @ 1-2A ?? but same thing it is a guess on current.

author: rthorntn
author_rank: Frequent Contributor
timestamp: October 08, 2019, 12:02:15 pm
content: Thanks, I also linked that motor because it has a 26mm shaft length.I can experiment with the volts and amps, this is the blade:https://www.aliexpress.com/item/32338393093.htmlSo I should be fine with a brushless 4S ESC that handles say 20 amps?

author: beanflying
author_rank: Super Contributor
timestamp: October 08, 2019, 12:28:13 pm
content: Strange coincedence I actually have one of their 80W DC fans on watchI am looking at either swapping out the entire fan on one of my coffee roasters or doing just a motor change to the one I have already. Currently on 240V 50W single phase but I want 25-100% speed control over it instead of the current mechanical baffle with full speed fan. Three phase and inverter was the other option but OTT on price for fractional power.I did ask a few questions of them a while ago and got a sensible reply so I would ask them what unit that fan is from or what power for it at your 3000RPM. If you don't have to guess as much then all the better.My job below for no good reason because I took a snap a week ago