Verification by impedance measurement and analysis of large capacity synchronous motor

Yusuke Kosugi
Design Section, Large Rotating Machinery Department 1, Rotating Machinery Systems Division, TOSHIBA MITSUBISHI-ELECTRIC INDUSTRIAL SYSTEMS CORPORATION


Starting time of large capacity synchronous motor extend over several tens of seconds, and it is important to take into account the starting characteristics which is starting torque, current, pole loss, etc. precisely. Although FEM analysis is valid to analysis starting characteristics, 3D FEM is not practical because it has a problem with time and convergence. On the other hand, 2D FEM is hard to calculate with high accuracy because the effects of coil ends and magnetic pole ends cannot be considered.
Then, in this paper, the comparison of subtransient impedance between measurement by Dalton – Cameron test and analysis by FEM was focused on. Comparing measured value of impedance and analytical value by FEM, the modification of 2D model including the effect of coil and pole ends was studied. As a result, the modified 2D FEM value was very close to with 3D FEM value and measured value.

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