I/1/2 to 2 hp saw motor buzzes struggles to turn, Think probably the starter. Is this a quick fix?. And approximately at what cost? Would it be cheaper to buy another motor?. TIA.
kwaka5,
Jan 2, 5:45am
Single or three phase. if single phase. Sounds like start cap needs replacing. No biggie, just get the old one out and take it to wholesalers
reggienz,
Jan 2, 5:48am
Sorry forgot to mention, Single phase
budgel,
Jan 2, 6:09am
Not a sparkie, just an old chippie here. There are starting capacitors for sale here on trademe. Blow all the dust out of the switch assembly and check that the bearings are running free while you are at it.
kenw1,
Jan 2, 6:38am
starter cap, be a really good place to start, IF everything else is turning freely, that includes the motor. Make sure you TURN THE POWER OFF.
tmenz,
Jan 2, 8:36am
Is it a table saw? Does it have belt drive? Does it actually have a capacitor? If so, disconnect from power, remove belt, see if motor spins freely by itself. Try powering motor on its own - if it's still struggling then depower, spin motor by hand, remove hand from the vicinity and repower while it's spinning - if it then spins up OK, capacitor will almost definitely be faulty.
skin1235,
Jan 2, 9:09am
A question here
how long can those 'caps' store energy for, and what does it take to de-energise them
azeo,
Jan 2, 9:12am
What everyone else has said, plus check the condition of the wiring to the start cap and the connections to the start cap, these can fall off due to crimps losing tension on the tags, the crimp itself losing contact on the wire, the wire fatiging and breaking off, or being soldered with dry joints, or even just twisted on.
The terminal studs/crimp lugs/wire-tails on the motor if it has them can also come loose, old motors also have old wiring. Sometimes new motors have shonky wiring depending on the source.
If it has a centrifugal start switch, this could be checked for dust, poor contacts, stuck open operation etc
intrade,
Jan 2, 9:18am
single plase depend even more on the capacitor i dont know if its called the run capacitor on these. be carfull you can die when you dont know what your doing and you get hit by charged capacitor or mains power also i am no electrition i just know quite a bit and electric motors can be extreem difficult . i had my usa single phase motor wired by a secoundhand tool repair shop, because i could not understand the wierd diagramm. if you dont know what your doing you take it to somone whom does. Even i do that.
msigg,
Jan 2, 9:21am
Dis-connect with insulated pliers.short out the capacitor with you protected screw driver just in case still charged.
intrade,
Jan 2, 9:30am
i would have the cap charged and then see if it discharges , i did open up a laptop charger cause it had stoped working lucky i did not get zapped, as it banged when i went to remove a heat shield with plyers. so i then did think hmm that big mother cap in there i dont want to be zapped by that one . so i got a screwdiver and shorted it out. it went bang like somone shot whith a gun . I droped everything and then said geeze i am lucky i did not tuch that bastard id probably be dead now . i have it in my cup-board now
skin1235,
Jan 2, 10:18am
agree with that, I don't mind getting in among electrics, vehicles and household, even cowshed supplies and wiring
but the sight or knowledge that there are capacitors in the loop usually means I've extra cautious, those buggas bite, hard, and not always size related, the small ones can knock you around too
nzjay,
Jan 2, 10:52am
Single phase motors have a centrifugal start switch, and the contacts get dirty. Take it to a motor rewinder if you are not competent to open it up, it's easily damaged. Enquire if the rewinder can fit an electronic start switch that does away with the centrifugal one. They will also be able to properly test the start capacitor.
shakespeare6,
Jan 2, 5:55pm
Not all single phase motors are capacitor start. Most early units found on early power tools, concrete mixers etc are a split phase / resistance start. They have 2 sets of winding ,start and run the start winding is held in circuit with a centrifugal switch, this some times sticks which causes over heating and burns on the start winding as a result won't start- same symptoms as a cap start that's failed
shakespeare6,
Apr 3, 4:12am
Regginez certainly pay to have it looked at and repaired, once you start getting up around the 2 hp in single phase the motors start getting pricey .
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