Testing method for determining synchronous reactance of permanent magnet generator through resistivity method

The invention relates to a testing method for determining the synchronous reactance of a permanent magnet generator through a resistivity method. Through the testing method, the aim of determining the direct-axis synchronous reactance Xd and the quadrature-axis synchronous reactance Xq of the permanent magnet generator is fulfilled. The method comprises the following steps of drawing a running vector diagram of the resistive load of the permanent magnet generator to deduce the calculation formulae of the synchronous reactance Xd and Xq; and performing a test of stator resistance Ra, a no-load test and resistive load running of the permanent magnet generator to finally determine the direct-axis synchronous reactance Xd and the quadrature-axis synchronous reactance Xq of a winding. When the permanent magnet generator is under a resistive load, the output current and voltage directions are the same, i.e., a vector included angle is 0 degree. When the permanent magnet generator is under a pure resistance load running state, the tested synchronous reactance has a contribution to the analysis and research of the running characteristic of such a working condition.