Axial non-uniform air gap hybrid excitation synchronous machine

Abstract

The invention discloses an axial non-uniform air gap hybrid excitation synchronous machine which comprises a housing, a stator and a rotor which are arranged in the housing, an annular magnetism conducting bridge and a rotating shaft which are fixed on an end cover, wherein the stator comprises a stator iron core and an armature winding embedded in a stator groove; and the rotor is fixed on the rotating shaft and comprises a rotor N pole shoe, a rotor S pole shoe and a tangential magnetization permanent magnet. The axial length of the permanent magnet is less than that of the stator iron core. A rotor N pole and an S pole hole respectively are a permanent magnet side adjacent to the permanent magnet and an electric excitation side which is not adjacent to the permanent magnet, and the lengths of two sections of main gas gaps formed between the rotor permanent magnet side and the stator iron core and between the electric excitation side and the stator iron core are different. The motor is wide in regulating range of the magnetic fields of the air gaps, can realize field weakening control in a wide rotating speed range under a speed regulation state, voltage regulation under a power generation state, and complete field suppression protection under a failure state, and has an important application value in a new energy automobile and an independent source system.

Description

technical field [0001] The invention relates to a hybrid excitation synchronous motor, in particular to an axial non-uniform air gap hybrid excitation synchronous motor. Background technique [0002] The hybrid excitation motor integrates the wide-range adjustable air gap magnetic field of the electric excitation motor and the advantages of high power density and high efficiency of the permanent magnet motor, and has broad application prospects. [0003] The magnetic shunt hybrid excitation synchronous motor can use the extension of the rotor pole piece to provide a bypass path for the permanent magnet flux, so that the motor is in a field-weakening state under normal conditions, and the bypass flux is controlled by the electric excitation magnetic potential in the bypass. Adjustment is carried out to realize the effective adjustment of the air gap magnetic flux. Reasonable design of the stator and rotor structure parameters can obtain a wide range of magnetic field adjustme...

AI Technical Summary

Problems solved by technology

The excitation current of the electric excitation part of the parallel hybrid excitation synchronous motor is usually introduced by the rotor, mostly with a brush structure, and the reliability is poor; there is a large mechanical air gap between the electric excitation part and the permanent magnet part, which is an "ineffective" space, which increases the The axial length of the motor reduces the power density of the motor, but also increases the length of the armature winding and its copper loss

[0005] Based on the above analysis, the present invention proposes a new structural form of hybrid excitation synchronous motor to overcome the shortcomings of the existing magnetic shunt hybrid excitation motor with limited field weakening capability and parallel hybrid excitation synchronous motor with low brush and power density , the case arises from

Images