The Shop > Electronics & IC Programing
X AXIS Driver
Bluechip:
--- Quote from: HS93 on September 11, 2012, 05:29:10 AM ---Ok thanks for that would this motor do ?
http://www.ebay.co.uk/itm/300511267976?ru=http%3A%2F%2Fwww.ebay.co.uk%2Fsch%2Fi.html%3F_from%3DR40%26_nkw%3D300511267976%26_rdc%3D1
they are a good powerfull motor the advert says they are 12 volt but when you look them up it says 24v we all runthem on 24v. I have fitte plenty in big boats and at 15 to 24 volt they are fine get a bit warm with a big prop after a few hours so short bursts you should even be able to take them up a bit
Peter
--- End quote ---
Can't really say, at a guess no. Why ??
The PCB traces are for a max current of 4A. That motor could take much more than that.
Going back to my antics ..
The motor I have is a motor / gearbox assembly. The reduction ratio is some 5:1, I suppose there is epicyclic in there but not certain. The belt reduction is about 3.5:1, can't be sure now. So I have a total reduction ratio of roughly 17.5:1 from motor to l/screw.
My WM16 has a l/screw of 10 TPI.
I wanted a max rate traverse rate of some 0.5" / sec on full volts, so that's 5 revs / sec. or 300 rpm.
Taking the belt drive reduction into account, I need about 1000 rpm on the output shaft.
So, fired up my variable PSU, I find 17VDC gives that rpm. No load current some 380mA.
There was an alloy tooth belt pulley on the motor, whipped it off and machined off the teeth. Now have a smooth disc on the shaft.
Wound it up at 17VDC and grabbed the disc ( :loco: ) to put some load on it. Now current is about 1A.
Never did a locked rotor measurement, but the resistance of the armature suggest a current of some 13A at 17VDC.
So now I have some idea of the motor characteristics.
The rest of the contraption is designed with this info. in mind.
If I started with the motor you posted, then it would be back to square 1 almost.
The circuit I have could be modified for a 12VDC motor by replacing the 78S15's with 78S12's and eliminating the 180R resistor. So the voltage would be correct but I doubt if it would have the capacity to deliver the current without potentially destroying the PCB traces. The 22VDC supply on mine has a 2A Quick Blow fuse inserted in the output. Hopefully, if ( when ) I lock the damn thing up, the fuse will rupture before the PCB .. One can but hope.
You would have to obtain the motor and find out what it really does electrically for the application you want it to do.
Not very helpful ... :(
Dave BC
HS93:
ok thanks for all that, ill stick to steppers.
peter
Bluechip:
--- Quote from: HS93 on September 11, 2012, 07:31:07 AM ---ok thanks for all that, ill stick to steppers.
peter
--- End quote ---
:) Don't blame you .... OK with a decent motor.
That was what I did first. I have some 4.5V 180 step/rev motors but they are not very frisky.
Could not get them to run on load at less than 4mS / step. ie some 1.4 rps on the l/screw ...
Took for ever to get from one end to the other ...X-axis is 720mm on mine IIRC ..
Dave BC
Rob.Wilson:
:clap: :clap: :clap: :clap: Clever old bugger :thumbup:
Looks like it works a dream Dave :zap:
Rob
Bluechip:
--- Quote from: RobWilson on September 14, 2012, 10:19:52 AM --- :clap: :clap: :clap: :clap: Clever old bugger :thumbup:
Looks like it works a dream Dave :zap:
Rob
--- End quote ---
Are you back in UK ???
Ah well. All good things must end I suppose... :lol:
Anyway, now you're back let's have some respect.
Less of the 'clever' if you don't mind .... :scratch: I have my reputation to think of.
Dave BC
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