The power of synchronous variable frequency motor is 1.27— 1.59 times that of ordinary motor. The powerful power greatly enhances the climbing ability of synchronous variable frequency motor, and there is no need to endure the trouble of climbing and crossing the bridge during riding. With the upgrading of power and the optimization of internal structure, the load capacity of synchronous variable frequency motor has also been greatly improved. The test data show that the load weight of synchronous variable frequency motor is1.33-1.76 times that of ordinary motor, which further improves the practical function of electric vehicle.