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PROGRAM ROZWOJOWY

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2-phase.    4-phase.

4 stator poles i 2 rotor poles    8 stator polos 16 rotor poles

Fig. 1.2. Yarious SRM geometries.

Generally, increasing the number of SRM phases reduces the torąue ripple, but at the expense of reąuiring morę electronics with which to operate the SRM. At least two phases are reąuired to guarantee starting, and at least three phases are reąuired to insure the starting direction. The number of rotor poles and stator poles must also differ to insure starting.

Most favored configurations - amongst many morę options - are the 6/4 three phase and the 8/6 four phase SRMs (Fig.l.2c,b and Fig.l.3a,b).

These two configurations correspond to q = 1 (one pair of stator poles (and coils) per phase) but q may be equal to 2, 3 when, for the three phase machinę, we obtain 12/8 or 18/12 topologies applied either for Iow speed high torque direct drives or for high speed stator -generator systems for aircraft. The stator and rotor pole angles J3_S and /?_r (Fig. 1.3) are in generał almost equal to each other to avoid zero torque zones.

Figurę 1.3. Representative SRM configurations.

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KAPITAŁ LUDZKI

NAROOOWA STRATEGIA SSÓJNOSO

UNIA EUROPEJSKA

EUROPEJSKI FUNDUSZ SPOŁECZNY

Materiały dydaktyczne dystrybuowane bezpłatnie.

Projekt współfinansowany ze środków Unii Europejskiej w ramach Europejskiego Funduszu Społecznego

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