The invention discloses a novel
flywheel energy storage device which is characterized in that a rotary shaft is arranged in the internal center of a vacuum container; a permanent magnetic radial bearing is embedded in the upper part of the rotary shaft; the middle and lower part of the rotary shaft are sleeved by a
flywheel, a single-winding outer rotor magnetic suspension switch
reluctance motor and radial and axial permanent
magnet biased magnetic bearings in sequence from top to bottom; the single-winding outer rotor magnetic suspension switch
reluctance motor is embedded in the inner side of the lower end of the
flywheel; each set of windings is independently controlled, and radial two-degree-of-freedom suspension force can be provided in addition to electrical / power generation functions. According to the novel
flywheel energy storage device, by utilizing the characteristic that the single-winding outer rotor magnetic suspension switch
reluctance motor can directly drive the flywheel, and a high-speed self-suspension function, and organically combining the characteristics of good unloading property and controllable suspension of the axial permanent
magnet bearing, the radial permanent
magnet bearing and a
hybrid magnetic bearing, the five-degree-of-freedom, low-loss and high-reliability suspension of the flywheel are realized, the running speed of the flywheel is increased, and the
power consumption and volume of a
system are reduced.