Research on synchronous type and induction type levitated rotating motor

A general solution of levitation control applicable to PM synchronous and induction type rotating motor is presented. It is intended for a single rotor to have both magnetic bearing and rotating motor. The rotational control is achieved with the traditional P pole magnetic flux, while the radial force is controlled with either P + 2 or P - 2 pole magnetic flux in the stator. In the previous work, the proposed general theory of levitated motor is successfully confirmed with no load experiments. In this paper, the load capability of the levitated motor is tested using a horizontal-type experimental setup. The stator has eight concentrated wound electromagnets, each of which is controlled individually by a DSP and power amplifier. The radial load is the gravity of the rotor, while the produced rotating torque is measured with a variable torque load system. The results obtained are discussed in detail.