golf cart - Page 1
Forum section: electronics / projects

author: House91320
author_rank: Regular Contributor
timestamp: April 15, 2011, 04:36:32 pm
content: Dose any one know what type of motor a golf cart uses.

author: sacherjj
author_rank: Frequent Contributor
timestamp: April 15, 2011, 04:49:58 pm
content: 36-48V 2-8HP electric motors. Some need controllers up to 400A. Maybe can provide more info if you ask what you are trying to know.Not to be too snarky, but you can alsotry this link.

author: House91320
author_rank: Regular Contributor
timestamp: April 15, 2011, 05:01:12 pm
content: i have searched googel but it didn't answer my question. What do the 4 leads on the motor do

author: DaveW
author_rank: Frequent Contributor
timestamp: April 15, 2011, 05:36:27 pm
content: If they've got 4 leads, then it's probably 2 leads for the field windings and 2 wires for the armature. The field windings take the place of the magnet normally used in DC motors. You can run these in parallel or series, but for lower power motors, they're normally shunt wired,HTH

author: Zero999
author_rank: Super Contributor
timestamp: April 15, 2011, 06:13:41 pm
content: It's becoming more common for electric vehicles to use an AC motor driven with an inverter rather than a DC motor for increased efficiency and reliability but this applies more to cars than small vehicles like golf buggies.

author: tecman
author_rank: Frequent Contributor
timestamp: April 15, 2011, 06:28:04 pm
content: Brushed DC motors are still the norm on carts.the reason for bringing all 4 leads out (field and armature) is to be able to reverse the motor.paul

author: sacherjj
author_rank: Frequent Contributor
timestamp: April 15, 2011, 06:55:45 pm
content: You also may have leads for an integrated tach sensor. Though these will be much smaller gauge.

author: firewalker
author_rank: Super Contributor
timestamp: April 15, 2011, 07:42:23 pm
content: Once I came across a dc motor of a small electric cart with 4 leads. 2 for powering the motor and 2 for an electro-mechanical brake inside the motor.

author: Zero999
author_rank: Super Contributor
timestamp: April 15, 2011, 07:50:56 pm
content: Quote from: firewalker on April 15, 2011, 07:42:23 pmAre you sure the extra leads were for the break? They're more likely to be for the field winding.

author: sacherjj
author_rank: Frequent Contributor
timestamp: April 15, 2011, 07:54:52 pm
content: Quote from: Hero999 on April 15, 2011, 07:50:56 pmI agree. These can be used as a regen brake with the right controller, but they are still just the normal windings.

author: DaveW
author_rank: Frequent Contributor
timestamp: April 15, 2011, 08:38:35 pm
content: Quote from: Hero999 on April 15, 2011, 07:50:56 pmThey are for an electromagnetic brake-this is for smaller motors though, almost all motors used for applications such as mobility scooters have them

author: Zero999
author_rank: Super Contributor
timestamp: April 15, 2011, 10:42:57 pm
content: Care to post a link to such a motor.

author: DaveW
author_rank: Frequent Contributor
timestamp: April 16, 2011, 12:35:57 am
content: Quote from: Hero999 on April 15, 2011, 10:42:57 pmHave too much stuff on my pile to get a picture of mine, but this is an examplehttp://www.societyofrobots.com/robotforum/index.php?topic=5553.0There are two plates which are clamped down onto a flange on the motor shaft. When power is applied (typically 24V) the two plates are separated and the motor can spin freely. This means that in the event of a low battery or when a wheelchair/mobility scooter is parked, it won't start rolling down a hillhttp://www.brookcrompton.com/pdf-files/2010e_brakes_v1.pdfPage 7

author: House91320
author_rank: Regular Contributor
timestamp: April 16, 2011, 12:58:55 am
content: the golf cart is an old version with relays for the control, it doesn't seem to be a brake any one have an idea.

author: DaveW
author_rank: Frequent Contributor
timestamp: April 16, 2011, 01:02:54 am
content: Quote from: House91320 on April 16, 2011, 12:58:55 amAre you sure they aren't separate armature and field windings?

author: House91320
author_rank: Regular Contributor
timestamp: April 16, 2011, 02:58:20 am
content: tats what i think it is but i don't know what pin dose what.

author: DaveW
author_rank: Frequent Contributor
timestamp: April 16, 2011, 11:32:30 am
content: Are all the wires the same gauge? And the best step would be to measure the resistance between all the wires

author: Zero999
author_rank: Super Contributor
timestamp: April 16, 2011, 11:49:28 am
content: I would expect the break to have a higher resistance and the same is probably true for the field winding.

author: House91320
author_rank: Regular Contributor
timestamp: April 16, 2011, 02:49:35 pm
content: schematic

author: House91320
author_rank: Regular Contributor
timestamp: April 16, 2011, 02:53:31 pm
content: https://www.eevblog.com/forum/index.php?action=gallery;sa=view&id=29

author: firewalker
author_rank: Super Contributor
timestamp: April 17, 2011, 07:07:18 am
content: Quote from: Hero999 on April 15, 2011, 07:50:56 pmYes, I took apart the motor. The system looked alike like the one found on large ac asynchronous motors.Like the one above. The thing is that this one was inside the motor, you couldn't tell right away that it had a brake. E.g this type of brake, on a.c. motors usually, is like an extra part on the motor (see picture bellow).

author: buffalo960
author_rank: Contributor
timestamp: April 17, 2011, 09:21:26 pm
content: House,Can you take a picture of the motor and post it here?

author: House91320
author_rank: Regular Contributor
timestamp: April 18, 2011, 10:07:27 pm
content: I figured it, out it is power for the rotor and power for the stator.