A Loss Analysis and Suppression Method of Magnetic Field Modulation Permanent Magnet Motor

Abstract

The invention discloses a loss analysis and suppression method of a magnetic field modulation permanent magnet motor. According to the stator, rotor, permanent magnet and winding structure of the magnetic field modulation permanent magnet motor, the magnetomotive force and permeability models are established, and the harmonic distribution of the armature winding and permanent magnet air gap magnetic field is derived; the harmonic order, frequency and Rotation characteristics, to determine whether each magnetic field harmonic can contribute to torque and loss; calculate the contribution value of each magnetic field harmonic to torque and loss, and find out the highly harmful magnetic field harmonics that generate loss but do not generate torque . Design the rotor flux barrier structure, analyze the adjustment effect of the flux barrier on the magnetic field harmonics, increase the reluctance on the flux path where the armature winding generates high-harm magnetic field harmonics, and reduce the high-harm magnetic field harmonics of the armature winding in a targeted manner component without affecting the harmonic components of the magnetic field that produce torque. The invention can directional suppress high harmful magnetic field harmonics, so as to achieve the loss suppression effect on the premise of ensuring high torque density of the motor.

Description

technical field [0001] The invention relates to a loss analysis and suppression method of a magnetic field modulation permanent magnet motor, belongs to the field of motors, and is particularly applicable to motor systems requiring high torque and high efficiency, such as electric vehicles, ship propulsion, and wind power generation. Background technique [0002] The direct-drive permanent magnet motor can save the intermediate transmission mechanism such as the gearbox, and has many advantages such as high reliability, high efficiency and low vibration and noise. At present, direct-drive permanent magnet motors have been used in various industries including electric vehicle hub motors, large wind turbines and ship propulsion systems. However, the rapid development of electric vehicles, marine propulsion and wind power generation requires higher and higher performance requirements of electric motor systems. For example, miniaturization and light weight are the development t...

AI Technical Summary

Problems solved by technology

But it is worth noting that the magnetic field modulation permanent magnet motor is rich in harmonic magnetic field and will lead to an increase in the electromagnetic loss of the motor

The high loss of the motor will cause the temperature of the motor to rise, which will reduce the performance of the motor and shorten the service life of the motor, and cause the failure of the motor winding and permanent magnet, and the motor cannot operate normally.

Field modulated permanent magnet motors are rich in field harmonics and their magnetic gear effects make accurate loss analysis very difficult

On the other hand, simply suppressing the harmonic content of the magnetic field will result in lower motor torque, losing the advantages of field modulated permanent magnet motors

Therefore, when reducing the loss of the magnetic field modulation permanent magnet motor, it is necessary to take into account the influence on the torque, which further increases the difficulty of suppressing the loss of the magnetic field modulation permanent magnet motor

However, there are few studies on the research loss of magnetic field modulation permanent magnet motors, and there is a lack of analysis and suppression methods for magnetic field modulation permanent magnet motor losses.

[0005] In summary, for a magnetic field modulated permanent magnet motor, rich magnetic field harmonics increase its torque density, but at the same time cause higher losses that affect the performance and operation of the motor

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