Series-parallel magnetic pole type hybrid permanent magnet memory motor

Abstract

The invention discloses a series-parallel magnetic pole type hybrid permanent magnet memory motor. The motor comprises a stator, an armature winding, a hybrid permanent magnet rotor and a rotating shaft. The armature winding is arranged on the stator; the hybrid permanent magnet rotor is arranged inside the stator; the rotating shaft is arranged inside the hybrid permanent magnet rotor; and a plurality of V-shaped magnetic poles with the same structural form are evenly distributed in a circumferential direction of the hybrid permanent magnet rotor, each V-shaped magnetic pole comprises a firstpermanent magnet and a second permanent magnet which are symmetrically distributed in a V-shaped radial direction, a coercive force of the first permanent magnet is smaller than that of the second permanent magnet, and the first permanent magnet and the second permanent magnet are magnetized in a tangential direction. In the invention, a design space of the rotor can be further expanded through the series-parallel magnetic pole structure so that a magnetic regulation range of the motor is improved, and the motor has high torque density and a strong magnetic stabilization capability.

Description

technical field [0001] The invention relates to a memory motor, in particular to a hybrid magnetic pole type hybrid permanent magnet memory motor. Background technique [0002] The development of permanent magnet synchronous machine (Permanent Magnet Synchronous Machine, PMSM) is closely related to the development of high-performance permanent magnet materials. Compared with traditional electrically excited synchronous motors, PMSMs are widely used in many high-end applications such as aerospace, ship propulsion, and electric vehicles due to their high efficiency, high power density / torque density, strong overload capability, and high reliability. equipment field. [0003] The traditional PMSM air gap magnetic field cannot be adjusted, and when it is operated as a motor, the speed adjustment range is greatly limited. In order to realize its wide speed regulation operation, most of them adopt the traditional method of d-axis magnetic field weakening current to offset the ma...

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Problems solved by technology

But this method of speed regulation has many disadvantages: 1) affected by the inverter voltage limit, the speed regulation range of the motor still cannot meet the requirements; 2) affected by the inverter current limit, the increase of the direct axis current will lead to The reduction of the quadrature axis current leads to a rapid drop of the electromagnetic torque during the field-weakening operation, making it difficult to maintain the constant power operation state; 3) The direct-axis field-weakening current will cause additional copper loss and reduce the operating efficiency of the motor in the high-speed area; 4 ) Direct axis demagnetization armature reaction may lead to irreversible demagnetization of low coercive force (Low Coercive Force, LCF) permanent magnet; The back electromotive force is large, which may cause damage to the power device of the inverter

The series magnetic circuit type VFMM has a high torque density and the permanent magnet operating point is stable, but it is difficult to adjust the magnetic flux and the adjustment range of the magnetic flux is limited; the parallel magnetic circuit type VFMM has a wide magnetic adjustment range, but there is a big accident in the LCF permanent magnet when the load is running. Demagnetization risk, people innovatively combined the advantages of series and parallel magnetic circuits, and proposed a new type of hybrid magnetic circuit VFMM, by combining the series magnetic circuit type load with strong anti-demagnetization ability and the parallel magnetic circuit type with a wide range of magnetic adjustment. Advantages, realizing complementary advantages, thus obtaining excellent characteristics such as high torque density and efficient operation in the whole range

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