Active noise reduction device for motor of electric or hybrid electric vehicle

Abstract

The invention relates to the field of noise reduction and discloses an active noise reduction device for a motor of an electric or hybrid electric vehicle. The active noise reduction device comprises a noise reduction shell and a controller. A motor body is sleeved with the noise reduction shell, and a gap is arranged between the noise reduction shell and the motor body. A plurality of horns are evenly distributed on the inner wall of the noise reduction shell. The controller is connected with the horns and is used for driving the horns to generate sound waves in order to offset the noise, wherein the sound waves are opposite to the noise generated by the motor in phase and identical to the noise generated by the motor in amplitude. The horns are HI-FI horns. An opening of the noise reduction shell faces one end of the output shaft of the motor body, and the opening is shaped like an inwards contracted frustum. The active noise reduction device can be used for processing the high-speed noise of the motor of the electric or hybrid electric vehicle, and therefore good finished vehicle NVH performance can be achieved.

Description

technical field [0001] The invention relates to the technical field of noise reduction, in particular to an active noise reduction device for electric motors or hybrid electric vehicles. Background technique [0002] The high-speed motor is used in the system of a pure electric vehicle or a hybrid vehicle, and the noise value is low when the motor rotates at a low speed, but at a high speed, the motor will generate great vibration and high-frequency noise, which is harmful to the environment and the driver. It is harmful. At present, the vehicle technology does not deal with the high-frequency noise. Because the structure of the motor is different from that of the engine, the noise of the motor cannot be eliminated in the form of a muffler. Therefore, it is urgent to invent a device that has the same function as the engine muffler. The high-speed noise is processed to achieve better vehicle NVH performance and reduce noise pollution to the environment. NVH is the English abb...

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved in the present invention is how to process the high-speed noise of the electric motor of the electric or hybrid vehicle, so as to achieve better vehicle NVH performance

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