incoming phase-leads
- Thread starter friny
- Start date
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Αυτός ο έλεγχος διεξάγεται αλλάζοντας την προπορεία δύο εισερχόμενων φάσεων.
At any suspected ball bearing damages in the oil pump, check first that the direction of the rotation is correct. When running backwards, the pump emits a sound, which in some cases may be confused with the jarring sound from damaged ball bearings. This control is made by switching two incoming phase-leads.
http://www.luvata.com/Documents/Hea...pumps_Installation and maintenance 1-1081.pdf
The Rotating Magnetic Field
We have seen how voltage peaks in a three phase circuit and how the stator poles are aligned to match those peaks, but why does the rotational magnetic field occur automatically? Figure 4 puts the linear flow of voltage peaks shown in Figure 2 and the pole locations shown in Figure 3 into a rotational perspective. The stator images show the three sets of poles and their polarity from Points 1 through 7. The graph image shows the phase voltage peaks for the same points. At Point 1, phase 1 is at its positive peak and a maximum magnetic field is generated in poles 1 and 1A. At Point 2, phase 3 is at its negative peak and the maximum magnetic field is generated in poles 3 and 3A. At Point 3, the maximum field has moved to poles 2 and 2A. If you study the other points you will see that this trend continues in a clockwise direction. Thus the three phases create an automatic rotating field in the stator. If any two of the incoming phase leads are switched, the magnetic field will rotate in a counterclockwise direction.
http://www.pumped101.com/AC Motors part 2.pdf
Αυτός ο έλεγχος διεξάγεται αλλάζοντας την προπορεία δύο εισερχόμενων φάσεων.
At any suspected ball bearing damages in the oil pump, check first that the direction of the rotation is correct. When running backwards, the pump emits a sound, which in some cases may be confused with the jarring sound from damaged ball bearings. This control is made by switching two incoming phase-leads.
http://www.luvata.com/Documents/Hea...pumps_Installation and maintenance 1-1081.pdf
The Rotating Magnetic Field
We have seen how voltage peaks in a three phase circuit and how the stator poles are aligned to match those peaks, but why does the rotational magnetic field occur automatically? Figure 4 puts the linear flow of voltage peaks shown in Figure 2 and the pole locations shown in Figure 3 into a rotational perspective. The stator images show the three sets of poles and their polarity from Points 1 through 7. The graph image shows the phase voltage peaks for the same points. At Point 1, phase 1 is at its positive peak and a maximum magnetic field is generated in poles 1 and 1A. At Point 2, phase 3 is at its negative peak and the maximum magnetic field is generated in poles 3 and 3A. At Point 3, the maximum field has moved to poles 2 and 2A. If you study the other points you will see that this trend continues in a clockwise direction. Thus the three phases create an automatic rotating field in the stator. If any two of the incoming phase leads are switched, the magnetic field will rotate in a counterclockwise direction.
http://www.pumped101.com/AC Motors part 2.pdf