PERFORMANCE OF A HYBRID SYNCHRONOUS RELUCTANCE MACHINE CAPABLE OF ULTRA – HIGH OUTPUT POWER

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ABSTRACT

A hybrid synchronous reluctance machine with an ultra-high Xd/Xq ratio and output power has been investigated. The hybrid synchronous reluctance machine’s d-q model (voltage and flux linkage) has been idealized and developed. The impedance and current locations from the synchronous reluctance machine’s steady state analysis were also obtained. In the auxiliary windings, the effect of capacitor loading was explored. The hybrid synchronous reluctance machine’s power factor and torque were compared to those of a traditional synchronous reluctance machine. The major restrictions of conventional synchronous reluctance machines were improved by this hybridized synchronous reluctance machine:

Due to a low ratio of direct to quadrature axis reactance (Xd/Xq), the output power and power factor are low. Two elemental synchronous reluctance devices were devised to do this. In the stator, both were integrally wound with two identical windings. One synchronous reluctance machine component features a round rotor, whereas the other has a salient pole. Both parts of the machine were mechanically connected. Both machines’ windings were connected in series and fed from the ac mains, while the other set was similarly connected in series (but transposed between the two sections of the machine) and fed from a balanced three-phase variable capacitance load. For the hybrid, the voltage and flux linkage equations were written in the abc reference frame. Classical methods were used to create the hybrid machine’s steady state and dynamic equivalent circuits. Matlab m-files were used to create the impedance and current loci for the developed model for various load angles and capacitance values. The hybrid machine’s power factor and torque were compared to those of a traditional synchronous reluctance machine. The capacitance loading of the auxiliary windings is shown to cause the total Xd/Xq ratio of the hybrid machine to be a variable with theoretical values ranging from zero to infinity. This corresponds to a very high power output with a power factor of one. It is also demonstrated that the hybrid synchronous reluctance machine has power factor control, which is an impossible feat.

CHAPTER ONE
INTRODUCTION
A synchronous machine is an alternating current rotating machine whose speed is related to the frequency of the current in its armature under steady state conditions. The magnetic field formed by the armature currents rotates at the same rate as the magnetic field created by the field current on the rotor, which rotates at synchronous speed, resulting in a constant torque. Almost all of the world’s electric power is generated by synchronous machines powered by water, steam turbines, or combustion engines. The synchronous machine is the primary means of converting energy from mechanical to electrical, just as the induction machine is the workhorse when it comes to turning energy from electrical to mechanical. The essential difference between a synchronous and an induction machine is that the induction machine’s rotor currents are induced, whilst the synchronous machine’s are not. A field winding and one or two damper windings are installed on the synchronous machine’s rotor. The properties of the rotor windings varied [1].
A synchronous machine, like most rotating machines, may function as both a generator and a motor. Synchronous motors are used for pumps in generating stations in big quantities (thousands of kilowatts), and in tiny sizes (fractional horsepower) in electric clocks, timers, turntables, and other applications where a consistent speed is required. The majority of industrial drives are variable speed.

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