Abstract: In this paper, a sort of leakage flux controllable interior permanent magnet motor（LFC-IPM） with open winding structure was studied. Based on the principle of flux leakage control, this paper analyzed the basic conditions of this motor to realize flux leakage control, studied the operating principle of LFC-IPM motor, and constructed the magnetic circuit structure of permanent magnet motor with controllable flux leakage. The magnetic field control characteristics and electromagnetic performances of LFC-IPM motor were investigated by finite element simulation. Furthermore, the mathematical model of the motor with adjustable flux leakage was established. In order to improve the speed range and dynamic response performance of the motor, a PI+RC control strategy based on considering the zero-sequence current suppression of the motor was proposed, which effectively improved the stability of the motor when adjusting the magnetic field, and suppressed the change of zero-sequence current amplitude caused by the magnetic field change. Finally, a prototype was manufactured, an experimental test platform was built, and experimental research was carried out. The results verified the magnetic flux leakage control characteristics, the effectiveness of PI+RC strategy, and the wide speed regulation characteristics of the motor system.