Motor noise is also a source of noise, and its noise level is one of the important indicators to measure the quality of the motor. However, how to reduce the motor noise of the motor is also a kind of noise source, and its noise level is one of the important indicators to measure the quality of the motor. However, how to reduce the mechanical noise and electromagnetic noise of the motor is a key issue. For the common mechanical noise and electromagnetic noise of the motor, the Dalan oil pump motor is analyzed and corresponding measures are taken to reduce it to a certain level. The specific method is as follows:
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1. Method of reducing mechanical noise
1 bearing selection
The bearing is a precision part connecting the stator and the rotor in the motor. The excellent bearing that meets the application requirements should be selected, and the bearing cannot be the main vibration source when the motor is running. General motor-specific bearings have vibration levels of Z2 and above.
2 bearing proper lubrication
After filling the bearing with sufficient oil, ensure that there is a uniform oil film between the rolling elements, cage and raceway. Here, the uniform oil film between the rolling elements and the raceway is dominant, but the lubrication problem between the cage and the rolling bodies cannot be ignored. To this end, we have designed a special grease injection device for grease filling the bearings. For each set of bearing rolling elements, multiple points (6 to 15 points according to the size of the bearing) are simultaneously greased and greased. In the middle, the bearing is rotated (the relative rotation of the inner and outer rings) until the bearing space is filled with grease.
3 end cap structure
In the process of processing, due to the fear of scrapping parts, the size is biased to the maximum physical boundary, resulting in a larger shaft size matching the inner ring of the bearing. For example, the bearing block drawing size is Φ30 (+0.002~+0.011), the actual machining size is mostly Φ30.01, the end cover bearing chamber size is Φ62 (0~+0.019), and the actual machining size is mostly Φ62.0. This fit is detrimental to the fit of the bearing. The interference between the inner and outer rings of the bearing will be increased, resulting in a small gap between the rolling elements and the raceway, causing abnormal noise in the bearing. We have adjusted the above tolerances separately, the bearing gear size Φ30 (+0.002~+0.011) is changed to Φ30 (0~+0.009), and the end cover bearing chamber size Φ62 (0~+0.019) is changed to Φ62 (-0.004～+ 0.015). After passing the above adjustments, the test results show that the vibration and noise values ​​of the motor are all reduced.
2. Method of reducing electromagnetic noise
1 The corresponding process is adopted during processing to ensure the uniformity of the air gap after the motor is assembled.
Firstly, only the inner casing of the base is finished, and the rear stator is press-fitted with a hot sleeve to reduce the deformation of the base during the press-fit process. After the winding stator core is pressed in, after the wire package is protected, the inner core of the supporting iron core is used, and the end faces and the toroidal surfaces of the ends of the finishing base are ensured to ensure the ends of the base and the inner side of the base. Concentricity.
This kind of processing method is different from the normal processing of the cast iron base to the finished product. The stator core is directly pressed and the stator is fabricated. The process of stator production is also adjusted in the design scheme. By increasing the length of the iron and the number of turns of the coil. Reduce electromagnetic density to reduce electromagnetic noise. The air gap magnetic field force is close to the sinusoidal waveform by using a sinusoidal winding and selecting the appropriate groove pitch.
2 design and manufacture low noise motor
When designing and manufacturing, analyze the causes of noise and adjust it in the design and manufacturing process to effectively reduce noise.
----- Editor-in-Chief: Dalan Oil Pump Motor 02-Procurement Consultant
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