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We can increase the torque of a reluctance synchronous motor if we __________

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We can increase the torque of a reluctance synchronous motor if we __________

(a) Increase reluctance of the magnetic circuit along the direct axis

(b) Decrease the reluctance of the magnetic circuit along the quadrature axis

(c) Increase the ratio of the quadrature axis reluctance to direct axis reluctance

(d) Decrease the ratio of quadrature axis reluctance to direct axis reluctance

I have been asked this question in unit test.

Question is from Synchronous Motor Phasor Diagram in chapter Synchronous Motors of Electrical Machines

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Correct choice is (c) Increase the ratio of the quadrature axis reluctance to direct axis reluctance

To explain I would say: Te = -1/2(φ^2)(Rlq-Rld) sin2δ.

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