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phase conducts), and maximum torąue is achieved by maximizing the dwell angle to take advantage of all potential torąue output from a given phase.

idealized

inductance

ideał

current currerrt

aera of

possible PWM current control

voltage

Fig. 1.8. Basic Operation of a Current-Controlled SRM - Motoring at Low Speed.

Ideally a phase is tumed-on when rotor poles, along the direction of motion, lay between neighbouring stator poles ćfo = 0 (Fig. 1.9), for the motoring operation modę of the respective phase. Only one voltage pulse is applied for a conduction (dwell) angle #_w = 9_C - 9_on (0_on -turn-on angle, 6_C - turn-off angle) in Fig. 1.9.

Fig. 1.9. Phase inductance, voltage, flux linkage and current.

During this period, neglecting the resistive voltage drop, the maximum phase flux linkage (/z_max, for constant rotor speed co and conseąuently rotor speed co, are:

a

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EUROPEJSKI FUNDUSZ SPOŁECZNY

u

Materiały dydaktyczne dystrybuowane bezpłatnie.

Projekt współfinansowany ze środków Unii Europejskiej w ramach Europejskiego Funduszu Społecznego