Re: Can anyone help me with ideas for driving a med/large dc spindle drive motor, ple
Quote:
Originally Posted by
Voicecoil
on which subject does the Bridgeport have pulleys connecting the motor to the spindle? Obviously at lower voltages you will get lower motor RPM.
It has a belt drive which i believe is a 1.5-1 ratio. I very much doubt I would be trying to drive this at anywhere close to it's max output and I can easily overcome most of the downsides of this just by reducing my DOC and better calculating the speeds and feeds. Hell, if i can get 30% of the normal max power it would turn this from a beautiful giant doorstop into a machine again!!
Quote:
Originally Posted by
Voicecoil
Going back to my original suggestion, rectifying & smoothing the mains to give ~325V @ abou 5KW will need some biggish capacitors which will draw hellish charging current spikes from the mains - using smaller caps that don't charge all the way when under load might make Powergen rather happier, but will of course reduce your available power.
To be honest I am going to have to figure this out as i go along, it is deeply outside of my comfort zone. I work with big AC all the time but DC, of this kind, is a mystery to me (but getting clearer as i look into it more). Getting this running is first on the list so I will give this a go and put fuses into the line so i don't do any damage. I have a few different caps i can use and i can trial a few different configurations to see how it is effected. Then I will further look at the control side, when i can get this to work.
Quote:
Originally Posted by
Doddy
I genuinely don't know the answer to this: Would it not be worth trialling without caps at first - the inductance of the motor windings will provide a hefty current stabilisation without throwing energy into expensive high voltage, high capacitance, high ripple caps?
I will try this too and let you know how it goes, so long as i don't do any permanent damage I am up for trying anything!
First things first though, i will have a bit of time tomorrow to do some measuring and calculations then will see where I am!
Thank you for all your help.
Mort
