By Juha Pyrhonen
In a single whole quantity, this crucial reference offers an in-depth assessment of the theoretical rules and methods of electric computing device layout. This e-book lets you layout rotating electric machines with its targeted step by step method of computer layout and thorough remedy of all current and rising applied sciences during this field.
Senior electric engineering scholars and postgraduates, in addition to computing device designers, will locate this publication helpful. extensive, it offers the subsequent: computer kind definitions; diversified synchronous, asynchronous, DC, and doubly salient reluctance machines. An research of sorts of building; exterior pole, inner pole, and radial flux machines. The houses of rotating electric machines, together with the insulation and warmth removing options.
Responding to the necessity for an updated reference on electric laptop layout, this publication comprises routines with tools for tackling, and strategies to, actual layout difficulties. A supplementary site hosts computer layout examples created with MATHCAD: rotor floor magnet everlasting magnet computer and squirrel cage induction computer calculations. school room verified fabric and diverse graphs are positive aspects that additional make this booklet an exceptional guide and connection with the subject.
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Extra resources for Design of rotating electrical machines
Example text
11 Drawing an orthogonal field diagram in an air gap of a DC machine in the edge zone of a pole shoe. Here, a differential equation for the magnetic scalar potential is solved by drawing. Dirichlet’s boundary conditions for magnetic scalar potentials created on the surfaces of the pole shoe and the rotor and on the symmetry plane between the pole shoes. The centre line of the pole shoe is set at the origin of the coordinate system. At the origin, the element is dimensioned as δ 0 , b0 . The δ and b in different parts of the diagram have different sizes, but the Φ remains the same in all flux tubes.
In an electrical machine with windings, the ‘artificial surface current’, that is the local value of the linear current density A, may for instance be calculated as a current sum flowing in a slot divided by the slot pitch. Equivalent linear current density can be employed in approximation, because the currents flowing in the windings of electrical machines are usually situated close to the air gap, and the current linkages created by the currents excite mainly the air gaps. Thus, we can set µ = µ0 in the observed area of equivalent linear current density.
Furthermore, some tests, which are not even feasible in laboratory circumstances, can be virtually performed. The most widely used numerical method is the finite element method (FEM), which can be used in the analysis of two- or three-dimensional electromagnetic field problems. The solution can be obtained for static, time-harmonic or transient problems. In the latter two cases, the electric circuit describing the power supply of the machine is coupled with the actual field solution. When applying FEM in the electromagnetic analysis of an electrical machine, special attention has to be paid to the relevance of the electromagnetic material data of the structural parts of the machine as well as to the construction of the finite element mesh.