tag:blogger.com,1999:blog-20340207.post1908833833575563564..comments2024-03-28T13:56:50.590+00:00Comments on Phil's Workbench: Mystery MotorUnknownnoreply@blogger.comBlogger9125tag:blogger.com,1999:blog-20340207.post-11029338300145394042014-09-08T08:44:38.680+00:002014-09-08T08:44:38.680+00:00I agree, looks like separate field and armature wi...I agree, looks like separate field and armature windings, which mean it has no permanent magnets in it.<br /><br />If you wanted to test, the field windings and armature windings will have quite different resistances. The armature should be low, the field windings should be high resistance.Michael Adamshttp://www.utrainia.com/noreply@blogger.comtag:blogger.com,1999:blog-20340207.post-40033738662371794952014-09-08T06:51:44.363+00:002014-09-08T06:51:44.363+00:00If it runs with all four wires connected, then try...If it runs with all four wires connected, then try swapping the polarity of one of the pairs - if it changes direction then I'd suggest one pair are for the field winding, the other pair are for the armature.<br /><br />If you swap the polarity on both pairs of wires at the same time then the direction will remain unchanged.<br /><br />Having seperate connections to the windings gives ultimate control of the motor, as they can both be manipulated seperately to acheive different things, alternatively they could be connected together in either "series", "shunt" (or "compound") configurations. Ones to Google for the differences to save me writing pages here!<br /><br />ps. I'm guessing so far you've had it connected in "shunt" mode if they <i>are</i> connections for the two windings.Ian Coopernoreply@blogger.comtag:blogger.com,1999:blog-20340207.post-58654418742845361272014-09-08T05:37:59.504+00:002014-09-08T05:37:59.504+00:00Ah, is iot a capacitor fan motor?Ah, is iot a capacitor fan motor?James Finisterhttps://www.blogger.com/profile/16351798531269786632noreply@blogger.comtag:blogger.com,1999:blog-20340207.post-12104325008987135522014-09-07T21:38:50.705+00:002014-09-07T21:38:50.705+00:00It crossed my mind it might be a dual voltage moto...It crossed my mind it might be a dual voltage motor, but then wouldn't it have six wires?James Finisterhttps://www.blogger.com/profile/16351798531269786632noreply@blogger.comtag:blogger.com,1999:blog-20340207.post-79475943469924689442014-09-07T09:25:27.166+00:002014-09-07T09:25:27.166+00:00I haven't tried it witl just 2 conencted. At t...I haven't tried it witl just 2 conencted. At the moment the pairs are twisted together. <br /><br />Will have a play and post results. Phil Parkerhttps://www.blogger.com/profile/15673614093646938053noreply@blogger.comtag:blogger.com,1999:blog-20340207.post-29889719977992718302014-09-06T20:45:20.039+00:002014-09-06T20:45:20.039+00:00One set isn't for the field whilst the other s...One set isn't for the field whilst the other set are for the armature?<br /><br />If you've had it running at 12V then clearly you've had it connected up Ok, did you need all four wires connected for it to run or not?Ian Coopernoreply@blogger.comtag:blogger.com,1999:blog-20340207.post-80098183703694723432014-09-06T13:32:20.898+00:002014-09-06T13:32:20.898+00:00servos tend only to have three wires, but a steppe...servos tend only to have three wires, but a stepper motor often has four. Mind you I would have thought pairing up the wires would not work well with a stepper motor, but then again I've never tried that.Markhttps://www.blogger.com/profile/02418527698793489162noreply@blogger.comtag:blogger.com,1999:blog-20340207.post-27546857132124659232014-09-06T11:51:23.494+00:002014-09-06T11:51:23.494+00:00I wonder if the second set of wires could be used ...I wonder if the second set of wires could be used for sensing how fast the motor is actually turning, i.e. to measure the back EMF.Markhttps://www.blogger.com/profile/02418527698793489162noreply@blogger.comtag:blogger.com,1999:blog-20340207.post-11758003434786518742014-09-06T10:01:45.829+00:002014-09-06T10:01:45.829+00:00Not sure about this one.
The numbers and letters ...Not sure about this one.<br /><br />The numbers and letters marked on the motor don't tell me anything, either.<br /><br />All I can think is that the 4 wires might suggest something like a servo, or stepper, motor.Anonymousnoreply@blogger.com