The step angle of a 3-\(\phi\) (A, B, C), 6 stator pole, 4 rotor teeth stepper motor if excited sequentially i.e, A, AB, B, BC, C, CA, and so on is:
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To quickly find the step angle for any non-standard or half-step sequence, use the formula $\beta = \frac{360^\circ}{N}$, where $N$ is the total number of unique electrical states per mechanical revolution. For half-stepping, $N = 2 \times m \times N_r = 2 \times 3 \times 4 = 24$ steps. Thus, $\beta = \frac{360^\circ}{24} = 15^\circ$.