Speed Control for 3 Post DC Motor
Speed Control for 3 Post DC Motor
(OP)
I want to speed control a 24v DC, series wound, 3 post, reversible, Ramsey-Pierce winch motor. The solenoids for forward and reverse are wired per this diagram: htt p://www.wm s1.com/cgi -bin/categ ory.pl?cat egory=inf_ dwgs&p agenum=130 My motor is as depicted in the diagram, the case is connected to ground.
Problem is, apparently nearly all motor controllers are intended for 4 post motors! I contacted technical support at Alltrax, a popular brand of controllers used for electric vehicles, and even they weren't sure if a controller would work or not! I was advised to isolate the controller from the vehicle's frame and connect B+ to my +24vDC wire going to the solenoids and the M- wire to the motor's ground.
Has anyuone actually speed controlled a 3 post motor or is there any reason why it wouldn't work?
Problem is, apparently nearly all motor controllers are intended for 4 post motors! I contacted technical support at Alltrax, a popular brand of controllers used for electric vehicles, and even they weren't sure if a controller would work or not! I was advised to isolate the controller from the vehicle's frame and connect B+ to my +24vDC wire going to the solenoids and the M- wire to the motor's ground.
Has anyuone actually speed controlled a 3 post motor or is there any reason why it wouldn't work?





RE: Speed Control for 3 Post DC Motor
Bill
--------------------
"Why not the best?"
Jimmy Carter
RE: Speed Control for 3 Post DC Motor
RE: Speed Control for 3 Post DC Motor
Regards,
John
RE: Speed Control for 3 Post DC Motor
RE: Speed Control for 3 Post DC Motor
If you do not need to be able to reverse the motor hook the controller up as shown in the controller diagram except connect M- to the isolated casing, jumper the A terminal on the motor to one of the F terminals on the motor and connect B+ from the controller to the other F terminal on the motor. If the motor runs in the wrong direction swap the connections on the F terminals.
If you need the reversing control connect the motor to the solenoids as shown in the print from your first post. Except connect B+ from the controller to the solenoid instead of the battery + (leave the solenoid control wiring hooked to the battery) and hook M- from the controller to the isolated motor casing.