MindMap Gallery Electrical Engineering-AC Motor Windings
This is a mind map about electromechanics-AC motor windings. There are three rigid requirements for the arrangement of AC windings: the electromotive force generated by the winding is close to a sine wave; the fundamental electromotive force of the three-phase winding must be symmetrical; a larger electromotive force can be generated when the number of conductors is certain. To meet the above requirements, we must first understand the basic concepts involved in motor winding distribution.
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AC motor windings
Basic requirements for AC winding
A sinusoidally distributed magnetic field produces a sinusoidal electromotive force in a conductor
Using slot potential star diagram distribution to ensure the induced electromotive force of three-phase windings symmetry
The largest possible fundamental electromotive force can be obtained by using a 60-degree phase band
Basic concepts of winding
polar distance
Expressed by length/expressed by number of slots
electrical angle
• When the number of motor pairs is p, the angle of the air gap circumference is p × 360° electrical angle
Three-phase AC winding
single layer winding
Only one component edge is placed in a slot
Number of slots per pole and phase: q=Z/2pm
Polar distance: Z/2p
Groove pitch angle a=360°/Z
Groove distance electrical angle a1=pa
Double layer winding
Place two component sides in one slot
Select coil pitch
Draw a star diagram of the slot electromotive force
Phase
Determine the parallel branch
Draw the winding expansion diagram
The electromotive force of the AC winding
Under sinusoidal distributed magnetic field
Conductor induced electromotive force Ec1
Short distance coefficient Ky1
Fundamental electromotive force Ey1
Distribution coefficient Kq1
Coil group electromotive force Eq
Single layer phase electromotive force
Double layer winding electromotive force
Total turns
Under non-sinusoidal distributed magnetic field
Effective value of harmonic electromotive force
Winding coefficient of vth harmonic
Phase potential effective value
How to eliminate harmonics
Use short pitch winding
Using distributed winding
Using symmetrical three-phase windings
Magnetomotive force of AC winding
pulsating magnetic potential
Three-phase fundamental wave magnetic potential synthesizes rotating magnetic potential
Three-phase symmetrical current
The magnetic potential generated by each of the three-phase symmetrical currents passing through the three-phase symmetrical winding
Fundamental magnetomotive force amplitude
Three-phase composite n-th harmonic magnetomotive force
The third harmonic magnetomotive force is 0
Fifth harmonic magnetomotive force
Seventh harmonic magnetomotive force