Three-phase permanent magnet synchronous motor assembling method

The invention discloses a three-phase permanent magnet synchronous motor assembling method. The method is characterized in that a special tool is adopted for assembling, and the special tool comprises a main body steel plate, stainless steel bolts, and bolt positioning steel plates; during assembly, the three-phase permanent magnet synchronous motor needing to be assembled is placed on an overhaul platform prepared in advance, bearings at the two ends of the motor are sleeved with motor end covers, the tool is erected on shells at the two ends of a stator of the permanent magnet synchronous motor through manpower, one set of bolts abut against the periphery of the motor end covers, and the other set of bolts abut against the periphery of the stator of the motor; a wrench is used for adjusting the bolts, so that the motor end covers and the motor stator coincide in concentricity; and twisting the bolts of the motor end covers by using the wrench until the end covers are completely sleeved on the shells of the