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A new concept of a variable impedance (Z) induction motor (VZIM) is introduced in order to combine high starting torque and high efficiency at the nominal operating point. In this type of induction motors a sectionalized cage rotor with different bar shapes for each sub-cage section is used. At standstill, sub-cages with high resistances are placed inside the stator bore to increase the starting torque...
Earlier studies have shown that it is possible to reduce the disturbing effects of space harmonics by making changes to the winding arrangement and stator core design. This paper presents the calculation of these space harmonic effects, including the induced harmonic voltages, currents and conduction losses in the rotor by using a linear equivalent circuit. The calculations were performed for two...
This paper complements others by the same authors [1], [2], where the general concepts, design calculations and constructional differences of an induction motor with a novel winding arrangement were presented, together with a magnetic analysis. In the present paper, the equivalent circuit for the space harmonics of the mmf is described and the slips and equivalent circuit parameters for each space...
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