ABSTRACT
of investigation - direct current electromagnet.of the work - to get skills of electromagnet calculation.of investigation - empirical formulas.calculation of dc-current electromagnet was made.course project consists of four parts. In the first part the so-called direct problem is solved and the magnetic-moving force is found. In the second part the winding is calculated and the pure MMF of the coil is found. The third part includes the so-called inverse problem, the magnetic flux is being determined. And the last, the fourth part includes defining of the actuation time of the electromagnet.ELECTROMAGNET, AIR-GAP, WINDING, ACTUATION TIME, MAGNETIC MOTIVE FORCE, INDUCTION. br/>
INTRODUCTION
course design is intended for getting skills on calculation of electromagnets. In this work next problems are solved:
- direct problem. Condition of the work of electromagnet: the armature is in open stage. Here such parameters are calculated: permeances of the air-gaps, magnetic fluxes, magnetic potential drops in metal and, as a result, magnetic motive force;
- calculation of winding. Here such parameters are calculated: diameter and cross-section of wire, resistance of wire, current, flowing in wire and precise value of magnetic motive force;
inverse problem. Conditions of the work: armature is in closed stage. Here such parameters are calculated: permeances of air-gaps, magnetic flux, inductance of metal and magnetic intensity;
calculation of dynamic characteristics of electromagnet. Here such characteristics are found: moving, pick up, actuation time and electromagnetic force for actuation of calculated electric apparatus.special computer programs are made for computing electromagnets and their characteristics. But the importance of this work is to understand and to learn the stages of finding one or another thing during calculation of contacting electric apparatus. br/>
1. MMF determination
1.1. Initial data
dc electromagnet with next parameters is given on Figure 1.1:
= 10 mm; d = 25 mm; d2 = 20 mm; l = 250 mm; h = 80 mm; dп = 10 mm; d2 = 0.25 mm; d к = 0.2 mm; induction at d = dп, B = 0.1 T; winding power voltage U = 36 V; magnet circuit material is steel of quality 50HXC.1.1. - Calculated electromagnet
tasks are:
- to determine MMF of electromagnet winding;
- to design electromagnet winding;
to define electromagnetic forces;
to...
