The China 3v dc motor manufacturers teaches you the mechanical noise analysis of DC motors
Noise is one of the three major environmental hazards in modern society. In our country, the noise of various kinds of electrical appliances has also been limited. DC motors are one of the sources of noise. DC motors are widely used in household appliances, automobiles, office appliances, workers and peasants, and other industries. DC motors have many advantages and are closely related to people's lives. Therefore, it is the responsibility of every designer and producer to minimize the noise of DC motors, optimize the braking conditions of DC motors, produce low-noise DC motors, and create a comfortable and quiet living environment for people.
There are many reasons for the vibration and noise of DC motors, which can be roughly attributed to mechanical noise and electromagnetic noise. The main point here is mechanical noise and the causes of mechanical noise.
1. Bearing noise. Due to the improper size of the bearing and the bearing room, noise is generated when the rotor of the DC motor rotates together. The non-circular or internal mixed debris of the ball causes them to collide with each other to generate vibration and noise. The improper pre-pressure of the bearing results in a slight vibration of the Raceway surface and noise.
2. Noise due to rotor imbalance.
3. Noise caused by assembly eccentricity.
The following methods should be used to reduce the mechanical noise of DC motors:
1. Sealed bearings should generally be used to prevent debris from entering.
2. When the bearings are assembled, they should be demagnetized, cleaned, cleaned with iron chips. The cleaned bearings generally reduce the noise of the bearings before cleaning. Grease must be clean, can not contain dust, impurities.
3. The cooperation between the outer ring of the bearing and the bearing room, and the cooperation between the inner ring and the shaft, should not be too tight. The radial clearance of the outer ring of the bearing and the bearing room should be within a certain range.
4. In order to eliminate the axial clearance of the rotor, proper pressure must be applied to the bearing. Waveform spring gaskets or three-point elastic gaskets are generally used, and it is appropriate to place them on the shaft extension end.
5. Use the deweighting or aggravating method to correct the rotor imbalance.
6. The filling buffer material between the magnetic steel and the output shaft can absorb the tiny vibration generated by the rotor during the phase change process, while avoiding the rigid connection of the output shaft to the external load, and transmitting the external vibration to the magnetic steel, affecting the torque generated by excitation. mutation. Prevent air noise caused by resonance between rotation frequency and load.
