#fan #winding #repair #tablefan The rotor and stator are both assembled from a stack of laminations stamped from sheets of electrical steel, typically 1 mm thick. The laminations are designed to minimize eddy currents, which would otherwise waste energy and create heat Windings consist of insulated conductors, which pass through slots cut along the axis of the stator. The spaces between the slots are called teeth. The shape of the slots and teeth depends upon the design of the electric machine. Slots may be rectangular, they may taper, they may be circular, etc. Pole means magnetic pole, and poles always come in pairs, usually referred to as "North" and "south." Poles may be physical objects in fixed places, or poles may be virtual objects moving as the machine operates. A pole may be a single piece of magnetic material, or a pole may be distributed over multiple teeth.
The wider part at the end of the tooth is called a tooth shoe.
Some authors use the term "groove" to mean the same thing as slot. In this article, the term groove refers to the indentations between parallel conductors in a layer of a winding. A rotor makes a complete rotation in 360 degrees. That amounts to 180 degrees to pass by each pole of a two pole machine. The current in conductors also goes through a complete cycle in 360 degrees.
For a four pole machine, each pole spans only 90 degrees. During the 90 degrees the current in a conductor goes through a half cycle, or 180 degrees. Because there are four poles, and 4 × 180 = 720, the conductors go through two complete cycles for each complete turn of the rotor.
To distinguish between the mechanical movement of the rotor, and electrical activity in conductors, the terms mechanical degrees and electrical degrees are used. mechanical degrees indicate the amount the rotor has turned about its shaft.
electrical degrees indicate the amount the currents in conductors has changed.
In general, electrical degrees equals mechanical degrees times 1/2 the number of poles.
No matter how many poles, each pole always spans exactly 180 electrical degrees, and it is called pole pitch.
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*****🙏Follow safety procedures at every repair🙏***
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8 ноя 2023
