Four measures to reduce noise of explosion proof motor of oil filter

Four measures to reduce noise of explosion proof motor of oil filter

Four measures to reduce noise of explosion proof motor of oil filter

Noise reduction measures for damping of explosion proof motor of oil filter

Improve the flexibility of stator core mechanical connection. Mainly used for large medium-sized motors, frame core adopt longitudinal steel structure. For example, damping materials such as aluminum epoxy resin between the core support. This is mainly for the external pressure of the core the loading before the damping material is applied to the core surface.

The contact resistance between the conductor the core is an important factor affecting the transverse leakage current distribution, the production process is the primary factor affecting the contact resistance between the bar the core. The contact resistivity of pressure casting aluminum guide bar is generally lower than that of centrifugal casting aluminum guide bar, the contact resistivity of welded rotor is generally higher than that of centrifugal casting aluminum guide bar. The contact resistivity between the inner surface of the rotor groove the guide bar can be improved to a certain extent by some conventional treatment processes such as phosphating oxidation. Even if the same production process is used, some random factors in the production process will cause the difference of contact resistivity. In addition, the contact resistivity of cast aluminum rotor will increase with the increase of rotor operating temperature.

There are five main reasons for bearing noise of explosion-proof motor

1. Noise generated by irregular vibration of mechanical parts shell caused by friction, impact unbalanced force between components during operation of explosion-proof motor of oil filter.

2. When the motor rotor vibrates, it will produce noise.

3. The bearing operation of explosion-proof motor will also produce noise.

4. The friction between the brush the commutator produces noise.

5. Noise caused by end cover vibration caused by bearing vibration.

Noise reduction measures for explosion proof motor bearing of oil filter

The surface roughness of the shaft does meet the requirements, the roundness of the bearing hole is out of tolerance (stator end cover), the material of bearing hole is poor, the extension end of armature mandrel is slightly scratched.

1. During the bearing processing factory inspection, it is necessary to strengthen the test inspection of the smoothness, roundness surface roughness of the bearing inner wall; confirm whether the oil hole material in the inner wall of the bearing meets the requirements whether the roundness of the bearing hole is out of tolerance; carefully check the shaft head to confirm whether the shaft head at the end cover side is qualified; whether the shaft extension end is scratched during the tandem riveting.

2. When assembling disassembling the motor bearing. Never use a hammer to knock on the motor bearing assembly disassembly directly to prevent the ring deforming; the oil circuit should be carefully cleaned. After the bearing assembly work is completed, the lubrication must be guaranteed, the end cover can be assembled in time, the inside of the bearing will enter into the dust, thus affecting the normal operation of the bearing. In the special case that the outer ring must be stressed, the outer ring should be rotated so that the raceway does produce indentation.

Noise reduction measures of cooling fan

In the design of fan, the streamline design like axial fan is selected

In 2p 4P motors, when the motor noise is very strong the temperature is allowed by the temperature rise of the motor, the outer diameter blade of the fan should be reduced, the inlet air volume should be reduced. When observing the design simulation, it is possible to effectively reduce the ventilation noise by this way.

Noise reduction design of inlet passage for explosion proof motor of oil filter

In order to avoid the sudden change sharp turn of airflow, streamline should be used as much as possible in the design of inlet duct. For example, in the design, 45 ° chamfering can be used at the air inlet end of the engine base, the chamfering can also be used at the inlet end of the fan blade.

Under certain conditions, muffler sound insulation cover can be installed, which can effectively reduce ventilation noise. In some imported high-efficiency motors, the common practical design assembly is the selection of low-noise fan hood. Some data show that the ventilation noise can be reduced to 3-5 dB (a).