Low-vibration and low-noise small-and-medium-sized asynchronous motor

Abstract

The invention relates to a low-vibration and low-noise small-and-medium-sized asynchronous motor. A composite damping sleeve is fixedly connected into an end cover in a shrinkage fit manner to form a composite damping end cover so as to be used for inhibiting vibration of a transfer path consisting of a rotor, a bearing, the end cover, a motor frame and a mounting motor leg, a support consists of an end ring and four ribs in the 45-degree direction on the end ring and adhered with damping boards, and a damping part, an end board, an iron core, an end board, a damping part and a pressure ring are sequentially stacked on the support and used for inhibiting vibration of a transfer path consisting of the stator iron core, the motor frame and the mounting motor leg. Vibration noise of the small-and-medium-sized motor can be reduced, and high-power density of the small-and-medium-sized motor can be improved. The vibration acceleration of the asynchronous motor is reduced by about 6dB in the low-frequency range as compared with an alternating-current asynchronous motor of the same specification and is reduced by about 9dB in the high-frequency range as compared with the alternating-current asynchronous motor of the same specification, the total vibration level is reduced by about 9dB, the air noise of the asynchronous motor is reduced by 16dB as compared with the alternating-current asynchronous motor of the same specification, and under the same power, the asynchronous motor with one motor frame number smaller than the alternating-current asynchronous motor of the same specification is lightened by about 5.5%.

Description

technical field [0001] The invention relates to a medium and small asynchronous motor, in particular to a medium and small asynchronous motor with low noise and low vibration. Background technique [0002] Through the vibration and noise test of small and medium-sized motors, it is found that the vibration acceleration and noise are generally relatively large, which not only seriously pollutes the environment and causes harm to the human body, but also affects the working quality and life of the production equipment it drives. The vibration noise of the three-phase AC asynchronous motor mainly has two sources. One is the radial force that changes with time and space and acts on the stator core due to the interaction of the fundamental magnetic field in the air gap and a series of harmonic magnetic fields. The iron core vibrates (electromagnetic vibration), and the second is the mechanical imbalance of the rotor and the mechanical vibration noise caused by the bearing. The tr...

AI Technical Summary

Problems solved by technology

At present, the vibration and noise reduction of asynchronous motors is mainly based on measures taken from the vibration source. Due to the constraints of the motor performance and volume weight, the reduction from the main vibration source that causes vibration and noise is very limited. Therefore, it is necessary to reduce electromagnetic vibration and noise. For the impact on the vibration of the whole machine, measures must be taken from the vibration transmission path. In the existing technology, vibration and noise suppression devices are added to the outer surface of the motor to achieve it. At the beginning of the design, vibration and noise reduction measures were not considered, which not only caused the motor Increased weight and size, lower power density

Moreover, the bolts directly pass through the damping pad to connect with the machine base, and the vibration isolation in the transmission path is not really realized, and the vibration damping effect is greatly reduced.

Images