Axial magnetic flux concentrated winding type hybrid excitation motor

Abstract

The invention diskloses an axial magnetic flux concentrated winding type hybrid excitation motor. The motor includes a stator disk and two rotor disks, wherein the stator disk includes a stator core,an armature winding, an exciting winding and a magnetic ring, the rotor disks respectively include a rotor back yoke, a magnetic pole block and a permanent magnet, left and right sides of the stator core of the stator disk are provided with stator slots, the armature winding is installed on a magnetic yoke of the stator core, two rotor disks are arranged on both sides of the stator disk, the number of rotor poles matches the number of the stator slots to form a concentrated winding motor structure, the permanent magnets and the magnetic pole blocks are alternately installed on the rotor disks,the two rotor disks are staggered and installed on both sides of the stator disk, the magnetic pole blocks extend outward in the radial direction and form an additional air gap of an excitation fieldin the axial direction with the magnetic ring on the stator core. The motor is advantaged in that the motor has high power density and wide magnetic field adjustment range, and has important application prospects in electric vehicle driving systems, hybrid power generation systems and aviation electric propulsion systems.

Description

technical field [0001] The invention relates to the technical field of axial flux permanent magnet motors, in particular to an axial flux concentrated winding type hybrid excitation motor. Background technique [0002] Hybrid excitation motor integrates the advantages of high efficiency, high power density of permanent magnet motor and convenient magnetic field adjustment of electromagnetic synchronous motor, and maximizes the advantages of both. Through the adjustment of excitation current, the ability of field-weakening speed expansion is greatly improved, and the efficiency of low-speed high-torque and high-speed field-weakening operation is significantly improved; at the same time, the adjustment of excitation current can ensure torque precision control under low torque loads, and further improve The short-term strong overload capability can well take into account the requirements of the hub motor in the following four aspects: ① The high-efficiency operating range of th...

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Problems solved by technology

For example, literature 1 (Comparative study of new axial field permanent magnet hybrid excitation machines, E G The axial magnetic field hybrid excitation motor described in IET Electric Power Applications, 2017) has higher torque density and better magnetic field adjustment characteristics. However, the rotor of this type of motor needs to be extended in the axial direction, which loses the special advantages of the thin and light structure of the axial motor , it is difficult to achieve integrated integration as a hub motor

Journal paper published by IEEE Trans.Ind.Electron. (Design, Analysis, and Control of a Hybrid Field-Controlled Axial-Flux Permanent-Magnet Motor, Metin Aydin, Surong Huang, Thomas A. Lipo, IEEE Transactions on Industrial Electronics, Volume: 57, Issue:1, Jan.2010), the axial magnetic field hybrid excitation motor adopts a pole-segmented structure, which introduces an excitation winding on the stator, and the field adjustment ability is greatly improved compared with the permanent magnet motor. Improvement, however, the magnetic flux leakage in the middle of the stator of the excitation winding of this structure is relatively large, and the power density needs to be further improved, and the installation space of the excitation winding is limited to a certain extent; The motor also belongs to this type of hybrid excitation motor structure topology

In addition, the rapid development of reluctance motors in recent years has also derived a series of hybrid excitation flux switching axial field motors, such as a double H-shaped stator core dual rotor hybrid excitation axial flux switching permanent magnet disclosed in patent CN201710086123. Magneto, a disc-type double-stator hybrid excitation motor disclosed in CN201610944356 all belong to the hybrid excitation flux switching type axial field motor. This type of motor has the advantages of convenient magnetic field adjustment and simple structure; however, the basic principle of this type of motor is given to the motor The improvement of the power density and structural strength of the main body has brought great challenges. It uses unipolar switching of the magnetic flux, and the utilization rate of the iron core is low, so it is difficult to reach the torque surface density level of the synchronous excitation motor.

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