The Watson brand electric fan at home was bought in the 1979. It was bought when I was in the second grade of elementary school. It has been used for 40 years and is still in use. It was a fine product among domestic products back then. The seat is cast iron, the wind blade is aluminum leather , and the speed control button is broken, I changed it myself. The noise is a bit loud now, and the sliding bearings are in front and back of the motor are large gaps. As long as the oil is lubricated every year, it can be used for 20 years. The scraps are collected and processed at the door at a high price. I really feel reluctant to leave the old items! It is stable in the living room and it seems that it can last more than ten years.
00s and 1980s electric fan motors were wound with copper core enameled wire, iron core is made of regular silicon steel sheet , with sufficient output power and good bearing quality. Nowadays, those electric fan motor coils that cost about 30 to 80 yuan are wound with aluminum core enameled wire, and the iron core is not necessarily stacked with silicon steel sheets, which produces large eddy currents, high heat generation, poor bearing quality, and does not have steel balls, so after eight or nine months of use, frequent failures, small speeds or even unable to rotate, and the coil has severe local short circuit due to heat, and is scrapped after one year! floor-standing fan for a few hundred yuan is of better quality.
ball bearings are rolling, and the oil-containing shaft sleeve is friction, with small rolling resistance and large friction resistance. The fan motors on the air conditioner use ball bearings, and it has not been seen that they need to be removed and refueled for maintenance in two or three years. Moreover, many people who need to use bearings, basically cannot directly install ball bearings because the circle of the ball bearing is a whole. For example, crankshaft cannot use ball bearings. The two ends of the crankshaft are ball bearings, not the load size, the key is the attitude towards quality. Motors as small as video recorder movements use ball bearings the size of corn kernels, and DC brushless motor cooling fans. Ball bearings are all ball bearings, and ordinary ones are shaft sleeve . Ball bearings are obviously durable than shaft sleeves!
In the early years, the shells and fan blades used by Watson's fans are all metal, just like Russian things, stupid, silly, sturdy but durable. Now, in order to save costs, they are replaced with plastic, but they are reluctant to use the material, and they age in a few years. In fact, the electric fan has a very low technical content, just a small motor. You should know that the current motor technology can achieve 7x24x52
used to focus on durability, but now it focuses on updating and replacing
used to create famous brands to protect famous brands, creating things for you to use for a lifetime or several lifetimes. First of all, the current manufacturing concept is completely different. The oil-containing bearings are all pressed by copper powder . There are many capillaries. Add sewing machine oil , or watch oil for lubrication. Add butter to help, block the capillaries. The early production also included felt pads with oil storage, which had small oil injection holes, which could be used for a long time. The current products are aluminum wires, iron bearings, and no felt pads. The aluminum wire heats up, dry bearing oil, jams and burns the coils, and the good ones are scrapped in the summer with two or three years. How many things can further reduce costs now! Instead of thinking about how long it lasts? Then there are aluminum wires instead of copper wires in the motor, iron sleeves instead of bearings and copper sleeves instead of , etc., so some products broke down after just one year of warranty! Do you practice or not? You can buy a new one if you have the money to practice! There are many reasons why the fan motor is durable or not. The first is the power margin and the fan motor is sufficient. The second is good heat dissipation, and the old fan motors are all made of aluminum shells. The third is that the copper wire is thick and the number of threads is large. Fourth, the friction coefficient of the front and rear bearings of the motor is low. Old fan motors generally have fuel ports, and there are wool felts with large oil absorption outside the sliding bearings. Most old fan motors are brass. The fifth is that the magnetic permeability coefficient of the Xi steel sheet is high. Now there are relatively durable fan motors. For example, Emmet fan motors are made of aluminum shells, and some fan motors use ball bearings with particularly low friction coefficient.
To 10,000 is the problem of material use. In the past, the fan core was thick, the iron core was silicon, the magnetic flux was good, and the eddy current was low. pure copper enameled wire, the coil turns were sufficient, so the motor did not heat up. Some speed adjustment switches used were thick-walled metal mechanical elastics, and the fan blades were thick-walled metal, so it would be fine for a hundred years to use. I don’t need to mention the production of today. It would be good if it could be used for one or two years. In fact, the main reason for the durability of the old fans was that the manufacturers in the past were willing to use materials. I had dismantled many old fans from the 1980s, and all used die-cast motor shells, thick pure copper wire motors, ball bearings, die-cast fan blades, and casting frames. It's hard to be bad! ! !
