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{
    "url": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/M2NAUOXC4Q7KWZPYLI3OX37HWAFLLAYX/",
    "mailinglist": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/",
    "message_id": "0F467A7D2DFB4E9DA751C6564D6A8A75@MAL",
    "message_id_hash": "M2NAUOXC4Q7KWZPYLI3OX37HWAFLLAYX",
    "thread": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/thread/I3SPJQZ2NAQC7QWDU7ECPFSYPEBSYIW5/",
    "sender": {
        "address": "wa6fwf (a) sbcglobal.net",
        "mailman_id": null,
        "emails": null
    },
    "sender_name": "wa6fwf",
    "subject": "[amsat-bb] Re: G-5500 stuck problem",
    "date": "2009-01-02T16:44:38Z",
    "parent": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/ACQV56VPWY73LZS5WV33GCOLP4XW2VYK/",
    "children": [],
    "votes": {
        "likes": 0,
        "dislikes": 0,
        "status": "neutral"
    },
    "content": "Hi Greg,\n   Yes these will burn up on their own, page 2 of the manual states that the maximum continuous run time is 5 mins, but when \nnormally tracking a sat were talking little movements of a couple of seconds.\n    I was measuring current  with a standard VOM set for AC current and I had no way of measuring the PF so what you say could be \ncorrect and I wasn't seeing the real current, and I'm not a motor guru but from what I understand  the capacitor and the winding \n90deg out of phase are only needed to get the motor spinning and turning in the direction that you want, that once the motor is up \nto speed you could disconnect the capacitor and 90 deg winding and the motor would keep running, also the capacitor value needed to \nstart vs. the most efficient to run at  \"if you were going to leave the circuit engaged\" are two completely different values, and \nthe current rise at run speed are caused by the mis-match.\n   So when you lock the rotor you are in start mode at x current and when your up to speed your seeing the mismatch/inefficiency and \nthe increased current flow.\n\nMaybe there is someone on here that could do a better job of explaining why this motor works like this.\n\nI don't remember the original sites I went to but a couple links that you might want to check out...\n\nhttp://www.lmphotonics.com/single_phase_m.htm\n\nhttp://www.allaboutcircuits.com/vol_2/chpt_13/9.html\n\n73 Kevin\nWA6FWF\n\n\n----- Original Message ----- \nFrom: \"Greg D.\" <[email protected]>\nTo: <[email protected]>; <[email protected]>\nSent: Thursday, January 01, 2009 11:08 PM\nSubject: RE: [amsat-bb] Re: G-5500 stuck problem\n\n\n\nHi Kevin,\n\nSo, my take-away here is that it's not the stall itself that is the problem; the motor is practically designed to self-destruct. \nSimply running the rotor back and forth enough times will do the same thing.  In fact, probably worse, given the higher draw.\n\nOne thing just occurred to me...  AC current measurements assume a specific phase relationship between voltage and current - power \nfactor, I think they call it.  This is a highly inductive load, and the phase-shift capacitor throws another unknown into the \npuzzle.  I wonder if the two measurements you took are real?  It could be that you think that the running current is higher, when it \nmay just be a measurement error.  How were they measured?\n\nGreg  KO6TH\n\n\n",
    "attachments": []
}