The synchronous reluctance machine is considered as a balanced three phase circuit, it is sufficient to draw the phasor diagram for only one phase.

**PHASER DIAGRAM OF SYNCHRONOUS
RELUCTANCE MOTOR**

The
synchronous reluctance machine is considered as a balanced three phase circuit,
it is sufficient to draw the phasor diagram for only one phase. The basic
voltage equation neglecting the effect of resistance is

V = E – j
IsdXsd – j Isq…………(1.1)

Where

V is the
Supply Voltage

Is is the
stator current

E is the
excitation emf

Ȣ is the
load angle

ɸ is the
phase angle

Xsd and
Xsq are the synchronous reactance of direct and quadrature axis

Isd and
Isq are the direct and quadrature axis current

I = Isd +
Isq…………….(1.2)

Isd is in
phase quadrtur with E and Isq is in phase with E.

V = E – j
IsdXsd – j IsqXsq

Equation
(9) is the torque equation of synchronous reluctance motor.

Plotting
the equation (9) as shown in fig indicates that the stability limit is reached
at Ȣ =± ᴨ /4

And by
increasing g load angle torque also increases.

In
synchronous reluctance motor, the excitation emf(E) is zero.

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