Not a member yet?
Click here to register.

Forgotten your password?
Request a new one here.

Shoutbox

You must login to post a message.

renatoa

09/29/2023 2:05 AM

makonisroast, davidholusa82 and alannguyen,

renatoa

09/28/2023 2:19 AM

cenglish3, Jacky Wang and RiverRoastCoffee

renatoa

09/26/2023 1:19 PM

, Oana !

renatoa

09/25/2023 1:36 AM

Clintm87,

renatoa

09/24/2023 1:28 AM

, InspiredRoastR

Shoutbox Archive

Forum Threads

Newest Threads

Amplifying Sound of FC
Coffee Brew Ratio App
Observations during 1C
First Fluid bed test...
Bubblebed roaster ba...

Hottest Threads

Bubblebed roaster...	[26]
Thermocouple Woes	[18]
Apwollo 11 roaste...	[17]
Observations duri...	[16]
2 lb Fluidbed Build	[16]

In Memory Of Ginny

Donations

Latest Donations
dmccallum - 10.00
JackH - 25.00
snwcmpr - 10.00
Anonymous - 2.00
Anonymous - 5.00

Users Online

Guests Online: 10

Members Online: 0

Total Members: 7,952
Newest Member: makonisroast

Oh no! Where's the JavaScript?
Your Web browser does not have JavaScript enabled or does not support JavaScript. Please enable JavaScript on your Web browser to properly view this Web site,
or upgrade to a Web browser that does support JavaScript; Firefox, Safari, Opera, Chrome or a version of Internet Explorer newer then version 6.

View Thread

Homeroasters - Home Roasting Coffee Community » BUILDING A ROASTER » Drum Roasters

Who is here? 1 guest(s)

DC motor speed control and over current protection
Stew	#1 Posted on 01/18/2019 7:07 PM
Newbie Posts: 19 Joined: April 09, 2015	I have a 24v DC gear motor I purchased used and a speed control power supply that I just got. In the description for the power supply it said that it was for DC 24v, 36v and 90v motors with permanent magnets. Should work! When I unpacked the power supply I noticed that it had a 90v sticker on it. I looked again at the description and what I missed was that it was for "over current protected and short circuit protected" motors. So it is relying on the over current protection to work with less than 90v motors (in reality it is only giving 80v). My question is how do I determine if the motor is protected? It is a Baldor motor and I couldn't get any info off there site or from searching Baldor and any of the numbers on the plate.


oldgrumpus	#2 Posted on 01/18/2019 8:28 PM
1/4 Pounder Posts: 178 Joined: July 25, 2012	An over current condition doesn't normally happen unless the motor is overloaded by working too hard or if it can't rotate. If your motor is sized correctly for your situation or oversized which is even better, than there shouldn't be any reason for concern. You could also just add a fuse that would pop at the rated current. Just my 2 cents. Clever Coffee Dripper Grinder: Macap M4 Roaster: Completed drum roaster project photos shown here: Photos https://goo.gl/ph...Da6K4wfqw5 Videos https://www.youtu...Bd1NrdpSUH


Stew	#3 Posted on 01/18/2019 9:31 PM
Newbie Posts: 19 Joined: April 09, 2015	Motor is over size by quite a bit I think. It?s good for 110 ft/lbs of torque. My concern, at full speed would?nt I be sending 80v to a 24v motor. When I turn the knob on the power supply the voltage goes from 0v - 80v. So it seems it is controlling the speed by changing the voltage. I could see maybe using a voltage limiter but would the potentiometer only work from 0-3 where it seems to reach 24v. Would like as much fine control as I can get.


BobbyS	#4 Posted on 01/19/2019 12:37 AM
1/4 Pounder Posts: 179 Joined: July 02, 2011	Here is the speed controller I am using for drum control and cooler stir control. One for each. https://www.amazo...controller


Stew	#5 Posted on 01/19/2019 10:04 PM
Newbie Posts: 19 Joined: April 09, 2015	Thanks for that Bobby. I looked at speed controllers like that but I would also need a power supply and the one I got did /does both. Figured I had the cat by the tail ... or so I'm hoping. Here is a link to the one I got. https://www.amazo...&psc=1 Here is a picture of the motor I have that I was hoping the speed controller would work with. Stew attached the following images:

Jump to Forum:

Similar Threads

Thread	Forum	Replies	Last Post
Renatoa can you walk us through a roast based on Heat power control vs PID?	Roasting Coffee	32	08/21/2023 12:41 AM
Unable to get Artisan Scope's PID to control heating	Dataloggers/Controllers/Rate of Rise Meters	4	08/01/2023 9:11 AM
Current draw pulses using SSR	Fluidbed Roaster	9	06/22/2023 6:40 AM
Problem with electric control Quest M6 Coffee Roaster	Quest M3 Roaster	27	06/20/2023 3:39 AM
Is vacuum cleaner motor ok for fb roaster?	Fluidbed Roaster	35	04/17/2023 11:22 PM