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For 2-pole motor, the electrical angle is the same as the mechanical angle, both of them is 120 °. The power supply lead wires of each phase winding should be separated by an electrical angle of 120°. The coils of neighboring phase bands are wound in opposite directions, seeing figure 2. The same connecting way is to V-phase winding and W-phase winding. The winding directions are the same (the current direction is the same), and the winding directions under the opposite magnetic poles are opposite. Slot 1 and 8 consist a coil, slot 1 is a first end, slot 2 and 7 consist a coil, slot 2 is a first end, and the two coils are connected end to end to form U-phase winding, so that the effective sides of the same winding are under the same polarity. There are 3 phase bands U, V and W under the N and S poles, connect the slots in the same phase band under each N pole and the S pole into a coil. Figure 2 is a circular diagram of a 2-pole 12-slot three-phase motor with 2 poles and 12 slots, setting 1 to 6 slots as N poles, and 7 to 12 slots as S poles. The following describes a single-layer chain winding with 2 poles and 12 slots of three-phase motor.Ī simple calculation shows the pole pitch is 6 and phase band width is 2. 12 slots is applicable at least for three-phase motor. The core utilization of the 6-slot motor is too low and is just only used to explain the principle. See figure 1, the light blue coil is single U-phase winding, the green coil is single V-phase winding, and the red coil is single W-phase winding.įigure 1 - 2 pole 6-slot single-layer chain expand windingĢ poles and 12 slots single-layer chain three-phase winding
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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:
Electric motor winding data sheet full generator#
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.
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The basics of AC motor windings are introduced in the "AC Motor Winding" courseware, and the windings of single-phase motors are introduced.
Electric motor winding data sheet full series#
Three-phase AC motors winding | Generator Series Courseware | Pengky