Use different size wire in electro clutch?
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From: DaveC on 16 Dec 2009 20:53 The coil in an industrial electromagnetic clutch (connecting the flywheel to the drive mechanism) has gone open-circuit. So it is being rewound by a motor rewind shop. I was just informed that the original wire was about 12 ga. (maybe slightly larger; original was metric) but it was rewound using 10 ga. Should I be worried about this change in wire size? Will this change the magnet's strength significantly? The current draw? Here's the original schematic: <http://i47.tinypic.com/2lkpt94.jpg> "F" is the clutch coil. The machine isn't currently wired to mains so the clutch's exact operating voltage isn't known. The transformer voltage that supplies the rectifier bridge seems to be 32 v (per label on the schematic). Here's photos of the clutch. (The coil is imbedded in a groove in the metal cylinder.) :: <http://i48.tinypic.com/2hnyqll.jpg> <http://i46.tinypic.com/2nlg5de.jpg> <http://i49.tinypic.com/24pjaqu.jpg> <http://i45.tinypic.com/29bdduw.jpg> <http://i47.tinypic.com/291c7cw.jpg> Will this change in wire size cause me troubles? Thanks, Dave
From: Eeyore on 16 Dec 2009 21:27 DaveC wrote: > The coil in an industrial electromagnetic clutch (connecting the flywheel to > the drive mechanism) has gone open-circuit. So it is being rewound by a motor > rewind shop. > > I was just informed that the original wire was about 12 ga. (maybe slightly > larger; original was metric) but it was rewound using 10 ga. Why do Americans persist in using stupid AWG that no-one else in the world uses except to entertain you ? Have you never heard of mm^2 ? Graham
From: Martin Riddle on 16 Dec 2009 22:01 "Eeyore" <rabbitsfriendsandrelations(a)removethishotmail.com> wrote in message news:016dce67$0$14148$c3e8da3(a)news.astraweb.com... > DaveC wrote: >> The coil in an industrial electromagnetic clutch (connecting the >> flywheel to the drive mechanism) has gone open-circuit. So it is >> being rewound by a motor rewind shop. >> >> I was just informed that the original wire was about 12 ga. (maybe >> slightly larger; original was metric) but it was rewound using 10 ga. > > Why do Americans persist in using stupid AWG that no-one else in the > world uses except to entertain you ? > > Have you never heard of mm^2 ? > > Graham Forget how to convert Graham? <http://www.engineeringtoolbox.com/awg-wire-gauge-d_731.html> I don't think 10 awg will be a problem, as long as the # of turns is the same. Measure the current to be sure. Cheers
From: Mark on 16 Dec 2009 22:14 On Dec 16, 10:01 pm, "Martin Riddle" <martin_...(a)verizon.net> wrote: > "Eeyore" <rabbitsfriendsandrelati...(a)removethishotmail.com> wrote in > messagenews:016dce67$0$14148$c3e8da3(a)news.astraweb.com... > > > DaveC wrote: > >> The coil in an industrial electromagnetic clutch (connecting the > >> flywheel to the drive mechanism) has gone open-circuit. So it is > >> being rewound by a motor rewind shop. > > >> I was just informed that the original wire was about 12 ga. (maybe > >> slightly larger; original was metric) but it was rewound using 10 ga. > > > Why do Americans persist in using stupid AWG that no-one else in the > > world uses except to entertain you ? > > > Have you never heard of mm^2 ? > > > Graham > > Forget how to convert Graham? > > <http://www.engineeringtoolbox.com/awg-wire-gauge-d_731.html> > > I don't think 10 awg will be a problem, as long as the # of turns is the > same. Measure the current to be sure. > > Cheers if the wire is a little thicker, the current might be a little higher and the magnetic strength would be a little higher. looks like you could change the xformer tap to the 30v location if needed. or add a small resistor in series. Mark
From: Paul Hovnanian P.E. on 16 Dec 2009 21:36
DaveC wrote: > > The coil in an industrial electromagnetic clutch (connecting the flywheel to > the drive mechanism) has gone open-circuit. So it is being rewound by a motor > rewind shop. > > I was just informed that the original wire was about 12 ga. (maybe slightly > larger; original was metric) but it was rewound using 10 ga. > > Should I be worried about this change in wire size? Will this change the > magnet's strength significantly? It'll be roughly the same if the volume of conductor in the winding is the same. > The current draw? Probably higher. Larger gauge wire (lower resistance), fewer turns (if the winding volume is a limiting factor). Its the ampere turns that affect the strength. > Here's the original schematic: > > <http://i47.tinypic.com/2lkpt94.jpg> I see taps on the trnsformer secondary. It might be possible to compensate for the winding change by selecting a lower voltage tap. If that doesn't interfere with the other relay(?) sharing the tap. -- Paul Hovnanian mailto:Paul(a)Hovnanian.com ------------------------------------------------------------------ What color is a chameleon looking in a mirror? |