A disc bearingless asynchronous motor

Abstract

The invention discloses a disk-type bearingless asynchronous motor, which includes a stator and a double-disk rotor, the stator includes an axial stator core, a permanent magnet ring, and a radial stator core connected in sequence; the two axial stator cores The inner side of the radial stator core and the inner side of the radial stator core are respectively provided with an axial stator core slot and a radial stator core slot. The axial suspension winding and the axial torque winding are arranged in the axial stator core slot. The radial stator core The slots are provided with radial torque windings and radial suspension windings; the double disc rotor consists of an axial rotor core that runs through the stator, and a disc rotor that is coaxially connected to both ends of the axial rotor core, and is connected to the axial rotor The core is composed of a radial rotor core in the middle of the core. The axial rotor core is coaxially connected with a rotating shaft extending from the outer end of the disc rotor. The inner end of the disc rotor is provided with an axial rotor slot. An axial rotor guide bar is provided, and a radial rotor guide bar is provided on the radial rotor core.

Description

technical field [0001] The invention relates to the technical field of motor manufacturing, in particular to a disc-type bearingless asynchronous motor capable of realizing stable suspension of a rotor with three degrees of freedom and generating rotational torque in both the axial and radial directions. Background technique [0002] Bearingless asynchronous motors have no friction, no wear, no lubrication and no seals, and are easy to achieve higher speed and higher power operation. They have broad applications in aerospace, turbomolecular pumps, flywheel energy storage, sealed pumps, high-speed electric spindles, etc. prospect. [0003] At present, the bearingless asynchronous motor is by superimposing an additional set of suspension windings on the torque winding of the stator slot of the traditional asynchronous motor, and the two sets of windings are respectively powered by a three-phase AC power supply with the same frequency to generate the rotating suspension winding...

AI Technical Summary

Problems solved by technology

On the one hand, the magnetic field of the torque winding interacts with the magnetic field of the levitation winding to generate radial levitation force; on the other hand, the magnetic field of the torque winding interacts with the rotating magnetic field of the rotor to generate torque. Therefore, the relationship between torque control and displacement control There is strong coupling, the control is complicated, it is difficult to establish an accurate mathematical model, and the control accuracy is low

In addition, in addition to the fact that the magnetic field of the torque winding will induce the rotor rotating magnetic field with the same number of pole pairs as the magnetic field of the torque winding in the rotor bar, the magnetic field of the suspension winding will also induce the same number of pole pairs of the magnetic field of the suspension winding in the rotor bar. The same rotor rotating magnetic field, the rotating magnetic field has a weakening effect on the levitation force, and will increase the complexity of torque control and displacement control, especially when it is running with load, and it will cause system instability in severe cases. suspension failure

Some scholars have proposed a bearingless asynchronous motor structure with a phase-separated rotor bar structure, but the number of pole pairs between the suspension winding and the torque winding of the motor still needs to satisfy P B = P M The relationship between ±1, the torque winding magnetic field must not only generate torque with the rotor magnetic field, but also generate levitation force with the levitation winding magnetic field. Promotion of its industrial application

[0004] To realize the stable suspension of the rotor with five degrees of freedom, it is necessary to have an axial magnetic bearing + a radial two-degree-of-freedom magnetic bearing + a two-degree-of-freedom bearingless asynchronous motor, or an axial magnetic bearing + two two-degree-of-freedom bearingless asynchronous motors Motor, or a two-degree-of-freedom bearingless asynchronous motor + a three-degree-of-freedom magnetic bearing to form a five-degree-of-freedom suspension drive system. In these three structures, an axial suspension control unit is inevitably required, resulting in a five-degree-of-freedom bearingless Asynchronous motor system has long axial length and high critical speed, it is difficult to achieve higher power and higher speed rotation, and it is bulky and expensive

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