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CN-121984262-A - Axial magnetic bridge radial magnetic flux permanent magnet synchronous motor

CN121984262ACN 121984262 ACN121984262 ACN 121984262ACN-121984262-A

Abstract

The invention provides an axial magnetic bridge radial magnetic flux permanent magnet synchronous motor, and belongs to the technical field of motor structures. The rotor comprises a plurality of first rotor sections and a plurality of second rotor sections, wherein the outer side edges of the first rotor sections and the second rotor sections are identical in shape and are alternately aligned in the axial direction, a plurality of radial permanent magnet groups are uniformly embedded in the first rotor sections along the circumferential direction, each radial permanent magnet group is symmetrically arranged along the d axis of the first rotor section, a plurality of magnetic barrier groups are uniformly arranged in the second rotor sections along the circumferential direction, and each magnetic barrier group is symmetrically arranged along the q axis of the second rotor section. The axial magnetic bridge structure can reduce magnetic leakage, increase torque density, improve flexibility of magnetic circuit design of the permanent magnet, effectively reduce stator and rotor loss, improve efficiency, reduce temperature rise of the permanent magnet, reduce demagnetizing risk and ensure high reliability and high efficiency operation of the motor.

Inventors

  • ZHAO XIAOKUN
  • WANG SHUAI
  • ZHANG WEI
  • WEI JIAN
  • WANG WEINAN

Assignees

  • 东北林业大学

Dates

Publication Date
20260505
Application Date
20251227

Claims (7)

  1. 1. The axial magnetic bridge radial flux permanent magnet synchronous motor comprises a stator, a composite rotor (3) and a rotating shaft, wherein the stator is sleeved outside the composite rotor (3) and is provided with an air gap between the two, the composite rotor (3) is fixedly sleeved outside the rotating shaft, the stator comprises a stator iron core (1) and a plurality of stator windings (2), a plurality of stator wire slots are uniformly formed in the inner wall of the stator iron core (1) along the circumferential direction, the stator windings (2) are embedded in each stator wire slot, the axial magnetic bridge radial flux permanent magnet synchronous motor is characterized in that the composite rotor (3) comprises a plurality of first rotor sections (5) and a plurality of second rotor sections (6), the outer edges of the plurality of first rotor sections (5) and the plurality of second rotor sections (6) are identical in shape and are alternately aligned along the axial direction, a plurality of radial permanent magnet groups are uniformly embedded in the first rotor sections (5) along the circumferential direction, each radial permanent magnet group is symmetrically arranged along the d axis of the first rotor sections (5), a plurality of second rotor sections (6) are uniformly provided with a plurality of second magnetic barriers along the circumferential direction, and each second rotor section (q) is symmetrically arranged along the axial direction.
  2. 2. The axial magnetic bridge radial flux permanent magnet synchronous motor according to claim 1, wherein Z stator slots are uniformly formed in the inner wall of the stator core (1) along the circumferential direction, and Z is an integer multiple of 3.
  3. 3. An axial magnetic bridge radial flux permanent magnet synchronous motor according to claim 1, characterized in that the stator windings (2) are of single or multiple sets of multiphase symmetrical winding structure.
  4. 4. An axial bridge radial flux permanent magnet synchronous machine according to claim 1, characterized in that each radial permanent magnet group comprises two permanent magnets (4), the two permanent magnets (4) being symmetrically arranged on both sides of the d-axis of the rotor segment one (5) and being arranged in a V-shape.
  5. 5. The axial bridge radial flux permanent magnet synchronous motor of claim 1, wherein each of the groups of magnetic barriers is a single layer arcuate slot, a multi-layer arcuate slot, a single layer irregularly shaped slot, or a multi-layer irregularly shaped slot.
  6. 6. The axial magnetic bridge radial flux permanent magnet synchronous motor of claim 1, wherein a misalignment angle between a d-axis of the plurality of first rotor segments (5) and a d-axis of the plurality of second rotor segments (6) is 0 ° to 45 °, and a misalignment angle between a q-axis of the plurality of first rotor segments (5) and a q-axis of the plurality of second rotor segments (6) is 0 ° to 45 °.
  7. 7. An axial magnetic bridge radial flux permanent magnet synchronous motor according to claim 1, characterized in that the sum of the number of rotor segments one (5) and two (6) is , And is also provided with Is an integer.

Description

Axial magnetic bridge radial magnetic flux permanent magnet synchronous motor Technical Field The invention relates to an axial magnetic bridge radial magnetic flux permanent magnet synchronous motor, and belongs to the technical field of motor structures. Background The permanent magnet synchronous motor has the advantages of small volume, light weight, high efficiency and the like, and is widely applied to the fields of electric automobiles, flywheel energy storage, distributed power generation and the like. However, the traditional permanent magnet synchronous motor has smaller direct-axis inductance and limited weak magnetic energy capacity, and is difficult to meet the constant-power speed regulation requirement of a wide-speed domain. Under the condition of high rotating speed, the weak magnetic current is large, so that loss is increased, and the permanent magnet demagnetizing can be possibly caused, thereby influencing the energy efficiency and the operation reliability of the system. To widen the constant power speed regulation range, conventional radial flux permanent magnet motors typically increase the direct axis inductance by designing radial magnetic bridges in the rotor. However, the radial magnetic bridge increases magnetic leakage and reduces torque density, and is limited by the internal structural space of the rotor, which is designed to reduce the arrangement space of the permanent magnets and limit the improvement of the performance. Therefore, it is needed to provide an axial magnetic bridge radial flux permanent magnet synchronous motor, which solves the technical problems of small direct axis inductance and limited weak magnetic energy of the traditional permanent magnet synchronous motor. Disclosure of Invention Aiming at the problems that the direct-axis inductance of the traditional permanent magnet synchronous motor is smaller, the weak magnetic energy capacity is limited, and the wide constant-power speed regulation range is difficult to realize, the invention provides the axial magnetic bridge radial magnetic flux permanent magnet synchronous motor. The invention aims at realizing the following technical scheme: The axial magnetic bridge radial magnetic flux permanent magnet synchronous motor comprises a stator, a composite rotor and a rotating shaft, wherein the stator is sleeved on the outer side of the composite rotor, an air gap is arranged between the composite rotor and the rotating shaft, the composite rotor is fixedly sleeved on the outer side of the rotating shaft, the stator comprises a stator iron core and a plurality of stator windings, a plurality of stator wire slots are uniformly formed in the inner wall of the stator iron core along the circumferential direction, the stator windings are embedded in each stator wire slot, the composite rotor comprises a plurality of first rotor sections and a plurality of second rotor sections, the outer side edges of the first rotor sections and the second rotor sections are identical in shape and are alternately aligned along the axial direction, a plurality of radial permanent magnet groups are uniformly embedded in the first rotor sections along the circumferential direction, each radial permanent magnet group is symmetrically arranged along the d axis of the first rotor sections, a plurality of magnetic barrier groups are uniformly arranged in the second rotor sections along the circumferential direction, and each magnetic barrier group is symmetrically arranged along the q axis of the second rotor sections. Preferably, the inner wall of the stator core is uniformly provided with Z stator wire slots along the circumferential direction, and Z is an integer multiple of 3. Preferably, the stator winding is of a single-set or multi-set multiphase symmetrical winding structure. Preferably, each radial permanent magnet group comprises two permanent magnets, and the two permanent magnets are symmetrically arranged on two sides of the d axis of the first rotor section and are arranged in a V shape. Preferably, each magnetic barrier group is a single-layer arc-shaped groove, a multi-layer arc-shaped groove, a single-layer irregularly-shaped groove or a multi-layer irregularly-shaped groove. Preferably, the offset angle between the d-axis of the first rotor segment and the d-axis of the second rotor segment is 0 ° to 45 °, and the offset angle between the q-axis of the first rotor segment and the q-axis of the second rotor segment is 0 ° to 45 °. Preferably, the sum of the number of the first rotor section and the number of the second rotor section is,And is also provided withIs an integer. Compared with the prior art, the invention has the following beneficial effects: (1) The d n shaft and the q n shaft of the first rotor sections and the d m shaft and the q m shaft of the second rotor sections can be overlapped or staggered by a certain circumferential angle to form an axial magnetic bridge, and the d-axis magnetic resistance of t