Question 1: Your small electric fan is a miniature "pole synchronous motor". Synchronous motors have the characteristics of "main current", so they also have the function of a generator and can be used directly as a "generator". Many small wind turbines are now of this type. When its speed is slightly higher than the fan speed, the voltage generated can be close to 220V, but the current is very low (you calculated it correctly)! In order to increase the current, you must return the 220V to 12V (depending on the needs of the battery). You can use a small transformer with a power of 5 watts, 220V/18V, and connect a "bridge rectifier" to it. the low voltage side of the transformer. It is now 100 watts. The following rectifier bridges cost less than two yuan each. This way you can make an ultra-small wind turbine. However, as the power is very low, its useilization is of little importance. But it charges the battery! As for why a small 22V/18V transformer is used, the initial reason is that it is difficult to maintain 220V when generating electricity.
Questions 2 and 3 are both asynchronous motors. Asynchronous motors with good "capacity compensation" can make their "power factor greater than 1" and can be used as "generators", but what should be said there? There is too much content to explain it in detail, but you can search online for "asynchronous motor to generator", "asynchronous generator", etc.
There are over 100,000 of my articles on the Internet. , which include “power factor issues” that can be discussed about “asynchronous generators”, are shared for free. Since there is too much content, you can check the monthly directory first:
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will Once the 50W fan is converted to 12V I will get 4.167A per hour and the battery will take 4.07 hours to fully charge. Once the battery is fully charged, how many hours will it take for the. Is the battery under voltage? During this period, the motor continues to produce electricity. If the battery voltage is below 50%, it will be charged; if it is high, it will be directly supplied to the load. Explanation of the formula. Answer: When the power of your generator is greater than the power of the TV, it is correct. Direct power without the need for battery. If you only have a 5-watt generator, you can use a 12-watt. volt 200 Ah (ampere) Watching television for a long time. Notee: “During the process of charging - reversing - from the lead-acid battery to the 220 volt power supply, the total power loss reaches 50%. For example, after 10 kilowatt hours of electricity are generated, after charging - inversion After using the electricity, it can only beThe efficiency is 5 degrees, and the loss reaches 5 degrees!