![]() Furthermore, good thermal performance drives the need for high slot fill and end winding thermal management. Careful design is therefore needed to avoid an unnecessary waste of expensive copper. The remainder will be in the end windings which do not contribute to motor torque production. The Figure below shows a full-pitch winding for a typical 4 pole motor.Ī 4-pole motor stator with a 3-phase distributed windingĪ part of the winding will be in the slot where it contributes to motor torque production. A full-pitch winding will have coils whose average span corresponds to a number of slots equal to the pole-pitch or 360°/p whereas a short-pitch winding will span fewer slots. The number of coils will depend on the number of stator slots, the number of phases (in our case 3) and the number of motor poles, p.Įach coil will span several slots. The number of turns will depend on specific design requirements.Ī distributed winding consists of several coils inserted into the slots of the motor stator as shown below. Several strands of wire can be connected in parallel to form a single conductor which is then wound into a coil which will have several turns. Windings are made up of several coils wound from insulated copper or in some cases aluminium wire. It is the MMF, combined with the motor magnetic circuit design, which gives rise to a travelling wave of flux in the airgap to produce the required motor torque. This MMF is produced when a balanced set of 3 phase AC currents flow in the phase windings. The objective of the distributed winding is to produce a sinusoidal Magneto-Motive Force (MMF) distribution in the motor airgap. The discussion which follows is equally applicable to the use of this type of winding in induction motors or in permanent magnet synchronous motors. ![]() However 3-phase distributed windings are the most commonly used in AC motors for industrial applications, which will be the focus of this article. ![]() Motor windings can take many shapes or forms. ![]()
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