Bearingless motor

A bearingless motor of a two-axis control type comprising:

• a rotor;
• a stator for applying support force and torque to the rotor;
• a first displacement sensor and a second displacement sensor to detect a radial position of the rotor;
• a computing circuitry to compute a displacement of the rotor in a tilt direction based on detection results obtained by the first displacement sensor and by the second displacement sensor;
• and
• a tilt-directional position controller to receive the displacement in the tilt direction obtained by the computing circuitry, to remove at least part of a band not including a natural angular frequency of tilting of the rotor, and to output a current command, wherein
• the stator includes
• a motor winding to generate a magnetic flux having p poles to produce the torque, and
• a support winding to generate a magnetic flux having p+2 poles or two poles to produce the support force,
• at least part of a magnetic circuit having the magnetic flux having p poles for producing the torque and at least part of a magnetic circuit having the magnetic flux having p±2 poles or two poles for producing the support force are common to each other,
• the support force is produced by superimposition of the magnetic flux having p±2 poles or two poles on the magnetic flux having p poles,
• p representing a natural number, and
• the first displacement sensor and the second displacement sensor are disposed at positions axially different from each other.