4.1.4. Excitation sequence for a variable reluctance motor

In variable reluctance motors the current direction does not affect the displacement of the rotor, the excitation sequences are simpler, since it only covers if a phase is active or not. Table 4.4 shows the sequence of excitation of an active phase for a variable reluctance motor of three phases (Figure (a)) and an engine of four phases (Figure (b)).

Table 4.4. Sequence of excitation of an active phase for a three phase motor and four phases.

The sequence of development for excitation of an active phase excitation is achieved by switching from phase to phase (phase A -> B phase -> Phase C -> A. .. phase).
To reverse the direction of rotation, is to reverse the sequence of excitation (phase A -> Phase C -> Phase B -> A. .. phase).

Table 4.5. Sequence of excitation of two active phases for a three phase motor and four phases.

Table 4.5 shows the sequence of excitation of two active phases, variable reluctance motor of three and four phases. This sequence is achieved by activating two phases simultaneously and combining them sequentially to get the advance or retreat.

Finally, the half-step sequence for the three phase motor shown in Table 4.6. This is the result of combining the sequences of an active phase and the two active phases.