steady-state analysis of hybrid synchronous machine with higher reluctance to excitation power ratio

The paper presents the steadystate analysis of a new hybrid synchronous machine with a higher reluctance to excitation power ratio. the machine comprises a round rotor and a salientpole machine elements that are mechanically coupled together and integrally wound. in each stator, there are two sets of identical polyphase windings identifiable as the primary and secondary windings which are electrically isolated but magnetically coupled. the primary windings are connected in series between the two sections of the hybrid machine while the secondary windings are connected in antiseries and terminated across a balanced capacitor bank. the hybrid machine exhibits a special feature that when running at the synchronous speed, its effective 𝑋d/𝑋q ratio can be amplified and hence its output by the tuning of the variable capacitance bank which capacitive reactance 𝑋𝐶 neutralizes only the quadrature axis reactance 𝑋𝑄 while the direct axis reactance 𝑋𝐷 remains unaffected. it is shown that at 𝑋𝐷/𝑋𝑄 = 3, the reluctance component of the output power is 2.5 times the excitation power. the calculated and the measured results from the machine are in good conformity.