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With the toroidal core winding technology an electric coil or winding is created by winding an electrical conductor (e.g. copper wire) through the circular ring and evenly distributing it over the circumference (Toroidal inductors and transformers, toroidal chokes).
Winding machines are classified based on the materials they are winding, [2] [3] some major types are Coil winding machine; Film winding machine; Rope winding machine [4] Paper winding machine; Foil winding machine; Roll slitting machines; spool winding machine; cop winding machine; On the basis of working the winders are classified as follows ...
The coil winding process and the process of joining the coil and core may be simpler. Since the coils are flat, rectangular copper strips can more easily be used, simplifying high-current windings. It is often possible to make the rotor significantly lighter. Potentially shorter magnetic path length.
The "auto" (Greek for "self") prefix refers to the single coil acting alone. In an autotransformer, portions of the same winding act as both the primary winding and secondary winding sides of the transformer. In contrast, an ordinary transformer has separate primary and secondary windings that are not connected by an electrically conductive ...
By August 1955, Japan Science and Industry Co., Ltd. was established [23] as a joint venture with a major toy manufacturer, and an automatic armature coil winding apparatus was developed, thereby expanding production capacity to 30,000 motors per day. [22]
The field winding can be excited by a brushless exciter. [31] Cylindrical, round rotors, (also known as non-salient pole rotor) are used for up to six poles. In some machines or when a large number of poles are needed, a salient pole rotor is used. [32] [33] Most synchronous motor construction uses a stationary armature and rotating field winding.
The complete circle represents the rotor. The solid bars represent the cores of the windings next to them. Power to the rotor is connected by slip rings and brushes, represented by the circles at the ends of the rotor winding. As shown, the rotor induces equal voltages in the 120° and 240° windings, and no voltage in the 0° winding.
Where ξ is the winding factor, a constant related to the construction of the windings. If the stator winding is connected to the primary phase, the total voltage seen from the neutral (N) will be the sum of the voltages at both windings rotor and stator. Translating this to electric phasors, both phasors are connected. There is an angular ...