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Very fundamental procedure for design of electromagnet has been lucidly narrated.
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Road Map
Design of electromagnetic coil • Basic equations• Calculation of R of coil and size of conductor • MMF requirement • Total winding area• Temperature rise of coil• Space factor
Magnetic force expression Index number of electromagnet Lifting magnets
• Flat-faced armature type• Horse shoe type• Plunger type
Design of electromagnetic coil
Note: A standard diameter of the conductor or wire is selected from SWG table. The resistivity of copper conductor at working temperature is found out by following expression
Electromagnets (Ems):
Classification of Ems•Tractive type: solenoids, mechanical movement of armature to do work, operated either from AC or DC, applications in relays, telephone receivers, CB etc•Portative type: for holding purpose, operated on only DC, applications in lifting magnets, magnetic clutches & couplings etc Three types (lifting magnets):•Flat-faced armature type•Horse shoe pole type•Plunger type