This paper looks at a novel optimisation approach to the design of surface mounted permanent magnet (SMPM) machines with self-sensing capabilities. A methodology will be presented which will look at the use of genetic algorithms (GA) to contemporarily maximise the output torque and the self sensing properties of such machines. A GA optimisation environment has been grafted with a finite element analysis (FEA) environment to enable the designer to account for both geometrical and saturation saliencies for an effective determination of the machine's self sensing characteristics. Satisfactory results were obtained in terms of torque maximization and self sensing capability. In addition sensitivity of the major geometrical parameters of the machine will be discussed in terms torque density and the self-sensing.
Results of an experimental investigation dealing with the behavior of a split wound six-phase self-excited induction generator (SEIG) with capacitor excitation in conjunction to a stand-alone small hydro power scheme is presented. As predicted, the scheme is found offering high reliability, improved capability of voltage build-up and load withstanding along with acceptable efficiency. Results obtained show that the system has sufficient capability for practical use in stand-alone power generation with small hydro.
In this paper there are presented the experimental results for the average power three-phase synchronous generator, connected successively on a controlled bridge rectifier, also on a half-controlled one. There are taken into account the electrical quantities to the generator windings terminals, the damping winding bars currents and the field in different portions of the magnetic circuit. The results are close to the ones obtained by computation and they allow the proper dimensioning of the generator elements.
In this paper three voltage control, strategies for three-phase ac voltage regulator have been studied. These strategies depend on varying the stator ac voltage to control the speed of three-phase induction motor. These strategies are phase angle control (PAC), extinction angle control (EAC), and modified phase angle control (MPAC). The first control strategy is carried out using three back-to-back thyristors connected in series with motor terminals. The other two techniques are used with converter having six bidirectional switches. Performance evaluation of the motor under these switching techniques is shown. Simulation of the system is carried out by PSIM computer program. The simulation results show stable operation for wide range of speed control. The level of harmonics in the supply currents and power factor have been also evaluated for different control strategies.
This paper presents a high torque mass ratio electromagnetic actuator which works with two differents coupling of the air gap magnetic field. The first one is a polar coupling as for the conventional synchronous machines and the secondth is tooth coupling as for the Vernier machines.
