Harmonic function type magnetic field modulation motor

Abstract

The invention provides a harmonic function type magnetic field modulation motor, which comprises a modulation ring, wherein the modulation ring applied between a stator and a rotor is composed of a plurality of modulation blocks subjected to harmonic function pole cutting. Different from a traditional rectangular modulation block, a harmonic function modulation pole can be in a trapezoidal function type, a sine function type, an arc edge trapezoidal function type and other special geometrical shapes. A harmonic function is established according to the harmonic distribution characteristics of a modulation magnetic field, enhances working harmonics and weakens useless harmonics. The harmonic function modulation pole integrates an air-gap magnetic field regulation and control strategy into a motor body structure, so that harmonic distribution distortion in an air-gap magnetic field is effectively suppressed, the torque characteristic is improved, and the operation characteristic of the motor is expanded. The harmonic function type magnetic field modulation motor has the advantages of high working harmonic amplitude, small harmonic distribution distortion, high electromechanical energy conversion efficiency, simple motor structure, simple motor control system, easiness in manufacturing and assembling, wide industrial application and the like, and can realize high-efficiency and stable operation of high output torque and low torque pulsation in a full operation range of the motor.

Description

technical field [0001] The invention relates to the field of permanent magnetic field modulation motors, in particular to a harmonic function type magnetic field modulation motor. Background technique [0002] With the improvement of China's economic strength and people's living standards, my country has entered the era of green economy of energy conservation, emission reduction and sustainable energy development from the era of rapid economic growth. As the most important electromechanical energy conversion device, motor can produce clean renewable energy or provide driving force, and is widely used in production and life. Therefore, strengthening high-efficiency motor design technology and structural innovation is of great significance to promote green development. [0003] With the improvement of the performance of permanent magnet materials and the expansion of its industrial application prospects, permanent magnet motors have replaced traditional electric excitation mot...

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Problems solved by technology

[0004] The fundamental wave in the air-gap magnetic field of the magnetic field modulation motor can be modulated into several working harmonics to generate output torque and realize electromechanical energy conversion. However, the number and amplitude of useless harmonics will also increase accordingly, resulting in the air-gap magnetic field The distortion of the harmonic distribution becomes larger, which inevitably causes problems such as low utilization of the magnetic field in the motor and low quality of the output torque, which limits the industrial application prospects of the magnetic field modulation motor

[0005] Based on the published literature, at present, domestic and foreign motor researchers improve the topology of the magnetic field modulation motor from the aspects of excitation structure, winding, auxiliary tooth structure and motor structure combination to improve the output torque. The following problems are common: 1) Motor topology Complicated, resulting in difficulty in motor assembly and low mechanical strength; 2) causing more serious harmonic distribution distortion, resulting in increased cogging torque and torque ripple of the motor, reducing the stability of motor operation; 3) using permanent magnets in the stator The output torque capability of the excited motor is poor, and it is easy to cause irreversible demagnetization of the permanent magnet due to temperature rise, reducing the reliability of the motor

[0006] In order to solve the problem of large distortion of harmonic distribution, enhance working harmonics and weaken useless harmonics, improve output torque quality, and break through the bottleneck restricting the development of magnetic field modulation motors, this project proposes a new type of harmonic function type magnetic field modulation motor to suppress modulation Harmonic distribution distortion in the magnetic field

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