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| 230v dc motor |
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| shipto:
I have a 230v dc motor from a clarke mini lathe. I assume I can run it from the mains with a diode or rectifier in place (please correct me if I am wrong). Again assuming I can, is there a formula for working out what kind of speed I can expect. The motor is supposed to be capable of 4000rpm which I guess would be a constant smooth supply so a full rectifier will? give me about this maybe more as the voltage will be 240 but a diode would give me 50 hertz at 240 volts and this is the speed I would like to know. I appreciate any input. |
| John Rudd:
240 volt mains rectified with a full wave bridge (4 diodes) with a reservoir capacitor should realise circa 380v dc..... (240 * 1.414.....) The voltage at this level is too high for the motor which is why it is fed with a modified supply from a speed controller.... The voltage rating of these motors is generally around 180 v dc, this is obtained from the speedo which is either mosfet based or thyristor (scr ) based.... If you want to run the motor from the mains I suggest you use a variac and limit the voltage goign to the bridge rectifier ( suitably rated voltage and current wise......) |
| shipto:
Thanks John I guess i will leave it then as I only want it for a single job I wont bother with this motor and save it for a project where it will be worth buying the proper controller. Was a nice thought while it lasted though. |
| Auskart:
If you know what you are doing, you can use the speed controller from an old Treadmill. |
| Pete.:
You want THIS, or something like it. This one is only good for about 1hp: http://www.ebay.com/itm/221221730576?ssPageName=STRK:MESINDXX:IT&_trksid=p3984.m1436.l2649 |
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