DESIGN FACTORS INFLUENCING RELIABILITY OF HKLAY.S 



997 



Fig. 12 — Magnetic circuit of a relay having embossed pole faces. 



Another instance where the effects of mechanical variations upon 

 its performance have been largely nullified by design, is in the design of 

 slow release copper sleeve relays. To make most effective use of the 

 copper sleeve, which causes the delayed action, it is desirable to provide 

 as low a reluctance as possible of the magnetic circuit when the relay 

 is in the operated position. Instead of providing small non-magnetic 

 separators in the air-gap between armature and the core as is usually 



0.5 1.0 1.5> 2.0 



DEVIATION IN DEGREES BETWEEN CORE AND 

 ARMATURE POLE SURFACES 



Fig. 13 — Comparison of flat and embossed pole surfaces and their magnetic 

 closed circuit reluctance with misalignment. 



