 Simple electrical, question |
|
|
|
Porsche, and the Porsche crest are registered trademarks of Dr. Ing. h.c. F. Porsche AG.
This site is not affiliated with Porsche in any way. Its only purpose is to provide an online forum for car enthusiasts. All other trademarks are property of their respective owners. |
|
|
| Elliot Cannon |
 Jun 15 2011, 01:19 PM
Post
#1
|
|
914 Guru  Group: Retired Members Posts: 8,487 Joined: 29-December 06 From: Paso Robles Ca. (Central coast) Member No.: 7,407 Region Association: None 
 |
I have a small 12v electric accessory motor on the car that I want to limit the rpm's on. I don't need to control the rpm, just reduce it somewhat. What's the easiest option to do this.
Cheers, Elliot |
   |
 
|
  |
Replies(1 - 7)
| SirAndy |
Jun 15 2011, 01:28 PM
Post
#2
|
|
Resident German Group: Admin Posts: 41,640 Joined: 21-January 03 From: Oakland, Kalifornia Member No.: 179 Region Association: Northern California |
QUOTE(Elliot Cannon @ Jun 15 2011, 12:19 PM)  I have a small 12v electric accessory motor on the car that I want to limit the rpm's on. I don't need to control the rpm, just reduce it somewhat. What's the easiest option to do this. Add a inline resistor ... If you want to control the RPM, add a inline potentiometer (which is just a variable resistor). (IMG:style_emoticons/default/smash.gif) |
|
|
|
| nathansnathan |
Jun 15 2011, 01:41 PM
Post
#3
|
|
Senior Member Group: Members Posts: 1,052 Joined: 31-May 10 From: Laguna Beach, CA Member No.: 11,782 Region Association: None |
If you put a resistor inline on the power to a dc motor, it will slow it down.
I did it with computer fans, I had the link to a calculator, but it was for computer fans. There are calculators to tell you what resistance you need to take whatever voltage to whatever voltage that you can find. Make sure to get resistors that are rated at a high enough wattage. |
|
|
|
| SirAndy |
Jun 15 2011, 02:11 PM
Post
#4
|
|
Resident German Group: Admin Posts: 41,640 Joined: 21-January 03 From: Oakland, Kalifornia Member No.: 179 Region Association: Northern California |
QUOTE(nathansnathan @ Jun 15 2011, 12:41 PM) Make sure to get resistors that are rated at a high enough wattage. (IMG:style_emoticons/default/agree.gif) |
|
|
|
| Elliot Cannon |
Jun 15 2011, 02:27 PM
Post
#5
|
|
914 Guru Group: Retired Members Posts: 8,487 Joined: 29-December 06 From: Paso Robles Ca. (Central coast) Member No.: 7,407 Region Association: None
|
So, if I want to cut the rpm in half, do I step it down to 6v? Can I get a resistor at Radio Shack? FLAPS? Thanks for the help. (IMG:style_emoticons/default/smile.gif)
|
|
|
|
| SirAndy |
Jun 15 2011, 02:43 PM
Post
#6
|
|
Resident German Group: Admin Posts: 41,640 Joined: 21-January 03 From: Oakland, Kalifornia Member No.: 179 Region Association: Northern California |
This might help:
http://www.sw-em.com/Vintage_Volvo_6V_to12V_conversion.htm (IMG:style_emoticons/default/smile.gif) |
|
|
|
| Mike Bellis |
Jun 15 2011, 06:44 PM
Post
#7
|
|
Resident Electrician Group: Members Posts: 8,345 Joined: 22-June 09 From: Midlothian TX Member No.: 10,496 Region Association: None
|
The VW world has been making devices to run 6V equipment from 12V sources for years. I would try one of their suppliers.
|
|
|
|
| 70_914 |
Jun 15 2011, 06:51 PM
Post
#8
|
|
Member Group: Members Posts: 395 Joined: 4-December 09 From: Roy, WA Member No.: 11,096 Region Association: Pacific Northwest |
|
|
|
|
|
1 User(s) are reading this topic (1 Guests and 0 Anonymous Users)
0 Members:
|
Lo-Fi Version | Time is now: 17th May 2024 - 01:06 AM |
Invision Power Board
v9.1.4 © 2024 IPS, Inc.