Static Characteristics:

1. Torque Current Characteristics:

The torque current characteristics are shown below for both permanent magnet and for variable reluctance as :

The holding torque will be increased with increase in the excitation current means both are directionally proportional to each other.

2. Toque displacement characteristics:

This is the relation between the displacement angle θ from the steady state position and the torque developed by the motor which is shown below: