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We have developed and tested a new shape of permanent magnet synchronous generator (PMG) rotor for a large scale wind turbine generator system. The new rotor structure has ventilation flues between poles that provide two advantages: (1) effective cooling of the permanent magnets, and (2) reduced eddy current loss.

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This paper reports on the experimental validation characteristics of a salient pole synchronous motor with the starting field circuit in contact. The starting characteristics were experimentally evaluated at voltages of 100%, 75%, and 50% using a 1.5 kVA salient pole synchronous motor. The signal for pulling into step was applied to the field circuit by using the control module for all test conditions. The results confirmed the proper pulling into step at 100% of voltage, and the results of the tests at 50% and 75% of voltage revealed that the pulling into step under these conditions becomes stable at the suitable slip condition. K E Y W O R D Sfield circuit, pulling into step, salient pole synchronous motor, starting characteristic 2 TEST MOTOR AND FIELD CIRCUIT Test motorParameters of the test motor are listed in Table 1; and appearance of the motor and its rotor is shown in Figure 1. As Electr Eng Jpn. 2019;208:43-52.