A motor that suppresses high-frequency vibration and noise without an external filter inductor

Abstract

The invention relates to a motor with no external filtering inducer and capable of suppressing high-frequency vibrating noise. The motor comprises a stator iron core, stator main windings, a rotor permanent magnet, a rotor iron core and a rotary shaft, wherein stator grooves are arranged on the inner circle of the stator iron core; stator teeth are formed between two adjacent stator grooves; the stator main windings are arranged in the stator grooves; the rotor permanent magnet is arranged on the rotor iron core which is arranged on the rotary shaft; and the rotary shaft is arranged on a motor base through a bearing. The motor is characterized by also comprising stator filtering windings, wherein the stator filtering windings are coils wound and formed on all the stator teeth, and are independent mutually. The motor has the advantages that high-frequency vibration can be effectively reduced, and the noise can be reduced, so that the motor is applicable to the fields of electric transmission, ship propulsion, rail transportation and the like.

Description

Technical field [0001] The invention relates to a motor capable of suppressing vibration and noise, in particular to a motor capable of suppressing high-frequency vibration and noise without an external filter inductor. Background technique [0002] Voltage-type inverters are more and more widely used in high-performance power electronic devices, and PWM (Pulse Width Modulation) technology is widely used as the core technology of the system. The so-called PWM technology is a technology that uses the turn-on and turn-off of the semiconductor device to turn the DC voltage into a voltage pulse sequence of a certain width to achieve variable voltage and frequency conversion. In addition to the required fundamental wave component, the voltage pulse sequence also contains harmonic components near the switching frequency and its multiples. The harmonic components with larger amplitudes are mainly distributed at one and two times the PWM modulation frequency f s Nearby, therefore, electr...

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Problems solved by technology

[0003] In order to solve the above problems, the current main solutions are to increase the PWM switching frequency, adopt random PWM modulation and install an AC filter at the output end of the frequency converter, etc., but these methods will bring the following problems: 1) Increasing the switching frequency not only It is a test for the converter equipment, and it will also bring a large switching loss; 2) The frequency spectrum of the inverter output voltage in the random switching frequency PWM is a wide and uniform continuous frequency spectrum. This method has an impact on the total vibration level Not obvious; 3) Since the AC filter has a filter inductance, the inductance is large in size and heavy in weight, and its application will be limited to a certain extent

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