All About Circuits Forum  

Go Back   All About Circuits Forum > Electronics Forums > General Electronics Chat

Notices

General Electronics Chat Discussion forum for general chat about anything electronics related, including asking questions about material in the All About Circuits E-book, Worksheets, and Videos.

Reply   Post New Thread
 
Thread Tools Display Modes
  #1  
Old 11-02-2011, 03:20 AM
gatorsby7 gatorsby7 is offline
New Member
 
Join Date: Nov 2011
Posts: 3
Default 24v DC reversible motor wiring

i have a mobility scooter (JP Cruiser - HCF305) that has a 24v motor with four wires. Two heavy gauge wires, one red, one black. and two light gauge one red, one black. the scooter has a forward, neutral, reverse (F-N-R)switch that i think is broke. the motor only runs one direction. the F-N-R switch routes thru an electric controller box. the 4 wires to the motor come out of the controller. my question is what do the motors 4 wires do? FYI, the F-R-N switch is 3 wires to the controller. the switch also has a hot wire from the key switch. what do the F-R-N 3 wires do? thanks for your help, i need to get my mobility back.
Reply With Quote
  #2  
Old 11-02-2011, 11:06 AM
jimkeith jimkeith is offline
Senior Member
 
Join Date: Oct 2011
Location: Pennsylvania
Posts: 538
Default

This motor is probably a shunt field DC motor--two light gauge field wires and two heavy armature wires--direction can be easily reversed by swapping either the field or armature wires. The controller probably PWMs the armature to produce variable voltage (speed).

On the FRN switch, it likely energizes one of two (2) pole relays that connect the field winding in either polarity. Field windings have high energy storage and cause relay contacts to arc and deteriorate. My best guess is that you have a bad relay--or as you said a bad switch.

Hope this is helpful.

From the voice of ignorance--never having worked on one of these.

I did a 5 minute google search on this, and did not turn up any useful info.

Check out these links--you may be able to pick someone's brain there, and they have a forum that may be useful. http://www.monsterscooterparts.com/mobility.html

http://www.home.earthlink.net/~hcf-305userforum/

Do not check out this link: http://off2dr.com/modules/cjaycontent/index.php?id=16

Last edited by jimkeith; 11-02-2011 at 12:08 PM. Reason: add info
Reply With Quote
  #3  
Old 11-02-2011, 12:13 PM
gatorsby7 gatorsby7 is offline
New Member
 
Join Date: Nov 2011
Posts: 3
Default

thanks for the reply jimkeith,

i too had searched the internet but not found the info i needed. but your reply got me thinking (that's dangerous).

i think the FRN switch is bad (as opposed to something in the controller)because somebody spun it around past its normal limit of travel. when i move the switch it doesn't look like the contacts on it line up with where i think they should be. i'm having difficulty getting it apart to see if i can "fix" it. i say fix that way because i don't really know how it works. after reading your response, i now think it is just a 12v polarity reversing switch. if i can't fix it, i see their are cheap ones on ebay that i could maybe try.

i have a multimeter, and confirmed that the hot wire from the key to the switch is indeed 12v. now if i can just learn how to determine polarity so i can test/fool with it.
Reply With Quote
  #4  
Old 11-02-2011, 04:05 PM
gatorsby7 gatorsby7 is offline
New Member
 
Join Date: Nov 2011
Posts: 3
Default

i have not had any success testing/fixing the FRN switch. I did learn more about the motor though. I tried reversing the two light gauge wires to change polarity in hopes of reversing motor...but it still ran same direction. I then reversed the heavy gauge wires and the motor reversed. i found the voltage to the heavy gauge wires varied with throttle, and the voltage at the light gauge remained constant (about -3.93v).

the FRN switch has the red hot wire to it, and 3 wires (black,blue,lt green) going to the controller. moving the switch makes no change in motor, and motor runs even with switch disconnectd. when rotating switch, the only reading i can get is 12v on black when switch is on Neutral. no readings on blue or green. i'm lost.....
Reply With Quote
  #5  
Old 11-03-2011, 03:16 AM
franlee franlee is offline
New Member
 
Join Date: Nov 2011
Posts: 1
Default 24v motor reversing wires

hello. if that is a shunt wound motor, which i believe there's no brushes, the thicker gauges wires are the main field wires and the thinner gauge wires are normally the reversing wires. your line will be 1 heavy gauge and 1 smaller gauge on each line. to reverse just switch the position of the smaller gauge wires. try a lower voltage like 12vdc just to be on the safe side not to burnt the windings and tap connect only not cap connect. also with dc voltage, reversing polarity would also reverse the rotation. hope it helps you.
Reply With Quote
Reply   Post New Thread

Tags
, , ,


Related Site Pages
Section Title
Worksheet Servo motor systems
Textbook Single-phase induction motors : Ac Motors
Textbook Tesla polyphase induction motors : Ac Motors
Textbook Stepper motors : Ac Motors
Textbook Synchronous Motors : Ac Motors
Worksheet DC motor control circuits
Worksheet DC motor theory
Worksheet DC generator theory
Textbook Induction motor, large : Ac Circuits
Textbook Automotive alternator : Ac Circuits


Similar Threads
Thread Thread Starter Forum Replies Last Post
24V DC relay circuit corrado33 General Electronics Chat 7 10-29-2009 02:53 PM
DC 24v Pulse Timer circuit BigfootBushy General Electronics Chat 6 10-12-2009 09:25 AM
24V DC Reg. PSU - Please help SIS_ICT The Projects Forum 7 09-30-2009 01:46 PM
24V AC to 18V DC Regulator Circuit markparaiso General Electronics Chat 7 03-09-2009 12:57 AM
24v dc to 72v dc siriggy The Projects Forum 11 05-16-2007 12:25 AM

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump


All times are GMT. The time now is 04:59 AM.


User-posted content, unless source quoted, is licensed under a Creative Commons Public Domain License.
Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2014, vBulletin Solutions, Inc.