Set the 1, 2, and 3 slots is N poles, and set the 4, 5, and 6 slots is S poles (the poles here are not the north and south poles of the specific magnetic field), and there are 3 phase bands under each pole, slots under each phase band connect as one coil, wand the winding directions of each neighboring phase bands are reversed. Its pole pitch is 3 and the phase band width is 1. The simplest is the three-phase winding with 2 poles and 6 slots, which is the most basic winding mode in the "three-phase AC motor principle model" courseware. The following is an example for analyzing two three-phase motors by the phase band division way.Ģ-pole 6-slot single-layer three-phase winding Calculate the number of slots in each pole and phaseįor, some other methods is needed for other complicated windings. Draw a circle diagram with all the slotsģ.
First determine the number of phases of the motor, the number of poles of the motor, and the form of the windingĢ.
The application of phase-band division to design windings is a basic method which is simple and easy. The width of each phase under each pole (measuring through the number of slots),įor example, for a three-phase motor with a total number of slots of 24 and two magnetic pole pairs, the pole pitch is 6 and the phase band is 2. Τ=Z/2p Z is the total number of slots of the stator, The width of each pole (measuring through the number of slots), For example, one magnetic pole pair motors produces a rotating magnetic field in 3000 rpm with three-phase AC of 50 Hz, and two magnetic pole pairs motors produces a rotating magnetic field in 1500 rpm. The specific windings in a three-phase AC motor are mainly based on the following data:įor the motor with P pairs of magnetic poles, the number of magnetic poles is 2p. Its Insulation should be reliable, there is need for high mechanical strength, dissipate sink heat, and simple manufacture. The copper loss of the winding is small, and the same to the amount of copper. The potential or magnetic field generated by the three-phase windings must be symmetrical, and the resistance and reactance of each winding should be balanced. The potential waveform generated by the three-phase AC motor and the magnetic field of the three-phase AC motor must be close to a sine wave and achieve the required amplitude. The basic requirement for three-phase AC motor windings is:
It is well known that both electromotive force induced in the three-phase AC motor produces and rotating magnetic field generated on the three-phase AC generator are from an important part of the motor or generator, that is, the windings. Three-phase AC motor winding basic structure The windings of three-phase AC motors are introduced in this courseware. The basics of AC motor windings are introduced in the "AC Motor Winding" courseware, and the windings of single-phase motors are introduced.
Three-phase AC motors winding | Generator Series Courseware | Pengky