Gyroscope prototype with active magnetic levitation and switched reluctance propulsion

A gyroscope system with a shaftless annular flywheel design supported by means of active magnetic bearings is presented. Elimination of contact friction, as well as a homopolar electromagnet arrangement aims to reduce drag forces that become significant at high speeds. The system is intended for applications where low maintenance is required, and where power consumption is important. Indeed, the gyroscope can be exploited in applications where resultant torque is desired on a perpendicular axis. Functional tests consisting of rotor lift-off, external disturbance imposition, and switched reluctance motor actuation are executed. Results demonstrate the viability of installing active magnetic suspension in gyroscopes. Motor performance improvement is achieved by including a lead activation, and lag deactivation of current phases. Limitations due to magnetic drag are evidenced in the rotor speed profile. Results also indicate operational considerations, such as rotordynamic contributions due to flywheel surface irregularities.