Method and system for judging clockwise and counterclockwise wind of fan
A headwind and wind turbine technology, which is applied in the field of judging the wind and wind of wind turbines, to achieve the effect of ensuring smooth start, accurate judgment, and optimized sampling time selection
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[0021] Embodiments of the present invention will be disclosed in the following diagrams. For the sake of clarity, many practical details will be described together in the following description. It should be understood, however, that these practical details should not be used to limit the invention. That is, in some embodiments of the invention, these practical details are not necessary. In addition, for the sake of simplifying the drawings, some well-known and commonly used structures and components will be shown in a simple schematic manner in the drawings.
[0022] The invention provides a method for judging whether the fan is in the wind or against the wind. When the fan rotates under the influence of natural wind and the motor is in the power generation state, the flow chart is as follows figure 1 shown, including the following steps:
[0023] Step 1: turn on the power switches of the three-phase lower bridge in turn, obtain the voltage difference of the three phases by ...
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