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| Chester Conquest mill power feed |
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| John Rudd:
Ok, Things have moved on slightly on the speed control front... The 555 timer thing is pants...Try as I might I cant get it to control the motor speed at a decent rate...Changing some of the component values makes things worse.. A change of tactic is required... So, on to a redesign.... |
| Mike K:
Darren, I think John is referring to duty cycle. Mike |
| Darren:
Ah yes, that's would be it, Thanks Mike... John, do you think that maybe there could be a miss match here between the DC motor and the AC signal you are feeding it? |
| John Rudd:
Err....probably...My guess would be the inductance of the motor is having some sort of effect.... :coffee: |
| Darren:
Yes, that sounds plausible, Do you have a simple dual voltage secondary transformer? If so why not give it a go with just two voltage outputs and switch between them? I'm sure you know what I'm suggesting, but for others, mains-fuse-transformer voltage in 240V-transformer voltage out 6/12V-rectifier to DC, The outputs will be slightly higher due to being rectified but close enough. I really don't think the actual speed of the wiper motor is that critical from my exp, just so long as you have a fast and a slow speed for convenience. I must rig this up sometime and test it in real life as I promised to sort something out for Stew. But I think it will work fine and would be rock solid reliable (unlike fancy electronics) Just a suggestion. |
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