The invention relates to a structure-changeable motor system. The structure-changeable motor system comprises a main controller, a structure-changeable type driver and an independent winding motor; the main controller receives a control instruction and feedback information of the permanent magnet independent winding motor and generates power drive and drive topologic structure change instructions; the structure-changeable type driver changes a drive topologic structure based on the drive topologic structure change instruction; the structure-changeable type driver changes the winding drive mode of the independent winding motor into N star-shaped structures or independent H-bridge structures; when the independent H-bridge structures are adopted, multiple windings of the motor are connected in series; and the structure-changeable type driver drives the independent winding motor based on the power drive instruction. The structure-changeable motor system can satisfy different working condition demands; and compared with a structure comprising multiple motors and a clutch, the structure-changeable motor system can reduce weight and volume of a motor drive system efficiently, can increase power density efficiently and can remove mechanical noise.