A calculation method of electromagnetic vibration noise of electric machine

Abstract

The invention discloses a method for calculating the electromagnetic vibration noise of a motor, which comprises the following steps: calculating the distribution of the electromagnetic force densityof the motor according to the operation condition of the motor, and calculating the static deformation and the natural frequency of the motor respectively; according to the distribution of the electromagnetic force density, the electromagnetic resultant force on the stator teeth of the motor is calculated, and the time-space harmonic of the electromagnetic resultant force is calculated. The frequency response function of the motor structure corresponding to each vibration mode is calculated according to the natural frequencies of each vibration mode corresponding to each spatial order of the electromagnetic force, and the transfer function of the motor mechanical structure is calculated according to the static deformation function and the frequency response function. The vibration displacement of the motor surface is calculated according to the time-space harmonics and the transfer function. The modal acoustic radiation efficiency of the motor housing is obtained, and the electromagnetic vibration noise of the motor is calculated according to the modal acoustic radiation efficiency and vibration displacement. In the process of analyzing the vibration and noise of the motor, the invention ensures that the calculation accuracy meets the precision requirement, and reduces the calculation amount to avoid consuming a large amount of calculation resources.

Description

technical field [0001] The invention belongs to the field of motors, and more specifically relates to a calculation method for electromagnetic vibration noise of a motor. Background technique [0002] Motors are widely used in all aspects of social production and life, such as power generation, transportation, industrial and agricultural production, and household appliances. There are many types of motors, including induction motors, electric excitation synchronous motors, permanent magnet motors, reluctance motors, etc. Although these motors have different structures, they all work based on the principle of electromagnetic induction. When the motor is running, an alternating magnetic field is generated inside, and these alternating magnetic fields generate alternating electromagnetic force, which causes the motor to generate vibration and noise. The vibration and noise of the motor will cause many hazards, such as loosening of the motor winding and iron core, wear of insul...

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Problems solved by technology

Although the finite element method has high calculation accuracy, it requires multi-physics calculations, consumes a large amount of computing resources, and has low efficiency. occasions of change

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