Timeline for What are the differences between an AC and DC coil relay?
Current License: CC BY-SA 3.0
9 events
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| Sep 2 at 1:32 | comment | added | Spehro 'speff' Pefhany | Also some good information in Chapter 2 of "Electric Relays, Principles and Applications" by Thurston (2006). | |
| Sep 2 at 1:13 | comment | added | Spehro 'speff' Pefhany | @jp314 There's something of a subtle point there- because of the physical construction, the attraction forces add, not the magnetic fields, otherwise they would indeed cancel out as you say (compare (sin(x)+ sin(x_theta))^2 to sin(x)^2 + sin(x+theta)^2. For a graphic illustration of the chattering you get when the shading coil is broken in an industrial contactor so it does not conduct see this video. The shading coil does affect the closing, but that's another matter. | |
| Sep 2 at 0:56 | comment | added | jp314 | The shader ring is used to slow down the closing of the relay armature. The current induced in it opposes the increasing magnetic flux as the armature closes and causes a 'soft' closing. The current in the shader is indeed out of phase with the coil, but at some point in the cycle, the 2 currents will cancel | |
| Sep 21, 2016 at 9:31 | comment | added | Power | After putting shader ring still it is chattaring. there is special type of material in core in solonoid Ac coil | |
| Aug 14, 2015 at 13:42 | vote | accept | Stephen Collings | ||
| Jun 26, 2015 at 15:24 | comment | added | akohlsmith | +1 from me for the link. Never thought about driving an AC relay from DC or vice-versa. | |
| Jun 26, 2015 at 15:09 | history | edited | Spehro 'speff' Pefhany | CC BY-SA 3.0 |
added 19 characters in body
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| Jun 26, 2015 at 14:59 | history | edited | Spehro 'speff' Pefhany | CC BY-SA 3.0 |
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| Jun 26, 2015 at 14:52 | history | answered | Spehro 'speff' Pefhany | CC BY-SA 3.0 |