Abstract
The paper deals with experimental study of the gap of a synchronous machine with using sinusoidal turns. The characteristics of a three-phase short circuit and the current dependence of the winding excitation are presented. Static modes of operation of synchronous machines in the stationary state of the rotor by supplying the stator and rotor windings with a direct current conducted by means of sinusoidal and cosine-shaped turns with respect to the transverse axis established in the air gap on the rotor surface along the longitudinal and transverse axes, respectively.
Highlights
Energy is converted from one type to another: in the generators, the mechanical energy communicated to the shaft of the electric machine is converted into electric energy, in the motors, the energy consumed from the power source is converted into mechanical shaft rotation energy
As it is seen from the experimental results, each sinusoidal coil had a half-wave length equal to the distance between the axes of two adjacent poles, corresponding to its location in the radial direction of the air gap
The value of 'Us is mainly determined by the scattering stream of the armature along the tooth crowns, which penetrates the sinusoidal coil the more, the closer it is to the surface of the stator bore
Summary
Energy is converted from one type to another: in the generators, the mechanical energy communicated to the shaft of the electric machine is converted into electric energy, in the motors, the energy consumed from the power source is converted into mechanical shaft rotation energy.Electric machines have the property of reversibility, that is, under certain conditions they can work both as electric power generators and as engines that drive various operating mechanisms, as well as in electromagnetic braking modes and some other special modes. Taking into account various phenomena that exist in the machine (saturation of the magnetic circuit, eddy currents in various massive metal parts, hysteresis, uneven air gap between the ferromagnetic cores of the stator and rotor, etc.) makes the task of analytical study of various operating modes of AC electric machines extremely difficult.
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