Electrical Induction Machines

The polyphase stator winding connected to a polyphase source establishes a magnetic field distribution which rotates relative to this winding with synchronous speed ωs which will depend on the frequency f1 of the polyphase source and the number of pairs of poles p from that same winding.

The electric frequency of the induced voltages and the electric currents established in the rotor is determined by the relative velocity between the velocities ωs of the synchronous field and ωr of the rotor. https://www.mrosupply.com/popular_products/3-hp-182TC-motors/ Because it depends on the induction of voltages in the rotor winding, the induction machine will not operate at the synchronous speed. Unlike DC machines, the induction machines do not have a field-specific winding and their stator is cylindrical in shape with equally spaced grooves which adjust the coils of the phase windings for a three-phase single-layer winding.

This magnetic field distribution, which is generated by the fmm wave of the stator, shifts the winding of the rotor, which induces polyphase voltages that establish polyphase currents, these rotor currents, in turn, produce fmm and therefore put a distribution of magnetic flux interacting with the stator flux and, consequently, torques are developed.

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