Now I have retired I can carry on with a project that I pick up and down for a year.
I have a Parvalux PM3 LWS 24volt 8amp DC Motor, there is an arm on the output shaft that needs to go from horizontal to about 35 degrees anti clockwise stopping at various places in between.
I already have a 2x25 Sabertooth Motor Controller and I would like to use the SSC-32 with the Sequencer Software to control the arm position.
I have done 3 wiring diagrams are any of these feasible?.
Nothing to technical please as my electronics knowhow is very limited!!
If any one lives in the Waterside of Southampton and can give me hands on help in would be greatly appreciated.
Thanks in advance.
Bus Pass John.
flic.kr/p/ak5cLH
flic.kr/p/ak7ZnG
flic.kr/p/ak7ZTW
flic.kr/p/ak81t3
Hope these links work.
None of the wiring diagrams make any sense, sorry… The motor with a motor controller will be able to be rotated in either direction, and the speed can be adjusted, but there is no form of feedback. So there is no way to rotate the output shaft to a specific location. You will need some sort of feedback, and some form of intelligent controller to get what you want. Because you have not stated you need the motor to rotate more than 45 degrees or so, you can attach a pot directly to the output shaft. Then the microcontroller can and read the pot to know where the output shaft is positioned. What determines when the output shaft needs to move? Does it need to be automated?
Sorry about the wiring, I looked through various posts and came up with them by guessing what people posted.
I have other bits and pieces, a Bourns Rotary Optical Encoder, a Phidget High Speed Encoder which attaches to the Bourns, I have machined an adapter to go onto the motor shaft, also a Picaxe 18M2 Starter pack which goes with a pot, I can machine the output shaft to take the pot, the shaft does not have to go more than 45 degrees.
I hope to start the shaft movement say with a switch, maybe automated later.
As you can tell I have all these bits and not a clue what to do with them.
How fast is the output shaft? When powered up does it rotate fast or slow? If it is slow then it’s going to be much easier to control. The motor controller you have may work, not sure of the current draw of the motor. But you need something in between the pot on the output shaft and the inputs on the motor controller. A programmable microcontroller. You’ll need something with an analog input. That rules out any basic stamps. The Basic Atom would work well. We don’t have the arduino board ready yet or it would be another option. The microcontroller monitors the pot to know where the output shaft is. It also monitors whatever you use to tell the motors to go to the next position. When it determines it has to move the output shaft it sends the correct pulses to the motor controller and the motor starts to rotate. When the value read on the pot is correct the pulses change to stop the motor. Do you have any interest in learning how to write a simple program?
On the “box” it says motor RPM 2800 gearbox RPM 8 Ratio 12/24.
I powered up the motor on batteries and it gave me 11 RPM at shaft, I again powered up the motor using a transfomer (24 volt) reading 28.2 volt with a 10 amp fuse (this is what we used on our hoists) and it gave me a reading of 11.25 RPM at shaft.
When I stand on the plate that the arm attached to it draws about 5 amp (I’m 15.5 stone) plus the weight of the rig
The motor is either on/off.
Yes, I have a interest in learing a simple program.
The speed of this motor means you may be able to make a PID loop for control. If it were very slow, like less than 1 rpm then a PID loop may not be very useful. A PID routine would allow for acceleration and deceleration to be used. What you need is something between the motor controller and the potentiometer.
Bot Board II / Atom Pro microcontroller. Active Robotics has these items.
lynxmotion.com/p-252-bot-board-ii.aspx
lynxmotion.com/p-468-basic-a … 8-pin.aspx
If you solder one of these onto the pot, the other end will plug into the Bot Board II’s I/O header pins.
lynxmotion.com/p-84-servo-si … le-12.aspx
Two more of the same cables can be used to connect the motor controller to the Bot Board II’s I/O header pins.
The pot connects to an analog input on the Bot Board II. The pot is basically a voltage divider. As the pot is turned the value changes proportionally. The motor controller can connect to any available I/O pins for control. The simplest form of the program simply measures the value on the pot and compares it to a destination value. Think of these values as positions, as that is what they represent. If the current position (measured pot value) is different than the desired position (the one in the memory) the program instructs the motor to rotate the proper direction to move the output shaft / pot to lessen the difference. When the two values are the same the program stops sending the pulses and the motor stops. I can help you with the simplest version of this, but I am not able to code the PID equivalent.
Hope this helps…
