Motor transmission system without bearing for multiphase single sleeve winding

Abstract

The invention discloses a multi-phase single winding non-bearing motor driving system, which comprises a multi-phase alternating current motor, a multi-phase inverter, an inversion driving unit, a detection unit, a torque and rotary speed control unit, a suspended control unit and a comprehensive unit, wherein the multi-phase alternating current motor has a set of windings with phase number n>=5, a motor stator winding is formed by windings whose axial lines are separated in an angle of 2 pi / n, each phase winding simultaneously comprises odd spatial harmonics and even spatial harmonics, the torque and the suspended control of the multi-phase alternating current motor are respectively finished in different control freedom degrees, two groups of currents with different phase differences of adjacent phases are simultaneously electrified into the motor through the multi-phase inverter for respectively realizing the torque driving and the rotor suspension of the driving system. The motor driving system adopts a set of multi-phase motor windings and a set of multi-phase univertor, realizes the non-bearing operation of the driving system, and has the windings with simple structure, is much easier to embed wires than a traditional double-winding non-bearing motor, is easy to realize the large power driving, and has higher reliability.

Description

technical field [0001] The invention relates to a bearingless motor transmission system, and is especially suitable for a high-speed and high-power bearingless AC transmission system. Background technique [0002] Bearings are the bottleneck for high-speed and ultra-high-speed operation of transmission systems. In order to break through this bottleneck, the concept of a bearingless motor was proposed in the 1980s. The principle is to embed two sets of 3-phase windings in the stator core, one set is used to generate electromagnetic torque, which is called torque winding; the other set is used to generate radial suspension force, called suspension winding. If the number of pole pairs of the torque winding is p, then the number of pole pairs of the suspension winding is p+1 or p-1. The two sets of windings generate two rotating magnetic fields with a pole pair number difference of 1, and they interact to generate levitation force on the rotor. [0003] Current bearingless mo...

AI Technical Summary

Problems solved by technology

In the high-power transmission system, limited by the single-tube capacity level of power electronic devices, only inverters with power devices connected in series or in parallel can be used to meet the high-power requirements, and there are problems such as voltage and current sharing difficulties.

The three-phase transmission system using this type of frequency converter (such as multi-level frequency converter) has disadvantages such as high price and low reliability. As long as one phase fails, the system cannot work normally.

However, if bearingless operation is to be realized, two sets of such frequency converters must be used to supply power to the three-phase torque winding and the three-phase suspension winding respectively, and the system price is more expensive and the reliability is further reduced

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