motor ?
- Thread starter Mike01
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- Placerville, CA, USA
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- Retired PV System Designer
To a first approximation, the greater the load on the motor the closer the PF is to 1.
cloudibew
Member
- Location
- orlando, florida, usa
I know enough to say that motors have a rating. And the closer it is to that rating the more efficient it is.
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gar
Senior Member
- Location
- Ann Arbor, Michigan
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- EE
150619-1956 EDT
A sample set of calculated curves for an induction motor are shown on p 213 in Fig. 13-12 of "Alternating-Current Machinery", by Bailey and Gault, 1951, McGraw-Hill.
Above 50% load power factor and efficiency are moderately flat and greater than 80%. These are calculations for a 35 HP rated motor of the 1951 time period. PF is about 0.27 at no load, and about 0.95 at 35 HP. At 50% load PF is about 0.87 .
.
A sample set of calculated curves for an induction motor are shown on p 213 in Fig. 13-12 of "Alternating-Current Machinery", by Bailey and Gault, 1951, McGraw-Hill.
Above 50% load power factor and efficiency are moderately flat and greater than 80%. These are calculations for a 35 HP rated motor of the 1951 time period. PF is about 0.27 at no load, and about 0.95 at 35 HP. At 50% load PF is about 0.87 .
.
gar
Senior Member
- Location
- Ann Arbor, Michigan
- Occupation
- EE
150620-0846 EDT
I tried Google Books to see if I could bring up the graph, but only a top portion of the graph showed. Now it appears that Google is providing only very small snippets of copywritten material. I believe Google previously showed larger snippets.
Close to me there are at least 10 librarys listed with this book. That is to be expected. But one listed took me to WorldCat and that is of no value.
You may be able to get a useful a set of motor-performance curves from a motor manufacturer for a particular motor.
.
I tried Google Books to see if I could bring up the graph, but only a top portion of the graph showed. Now it appears that Google is providing only very small snippets of copywritten material. I believe Google previously showed larger snippets.
Close to me there are at least 10 librarys listed with this book. That is to be expected. But one listed took me to WorldCat and that is of no value.
You may be able to get a useful a set of motor-performance curves from a motor manufacturer for a particular motor.
.
Don't know if this will work.....
Calculated Performance LRT PUT "2/4" "3/4" FLC
External Rotor Res (W) 0.000 0.000 0.000 0.000 0.000
Slip (pu) 1.000 0.064 0.002 0.003 0.005
Speed (rpm) 0 1405 1497 1495 1493.0
Stator Current (A) 2921 2738.9 366.0 500.1 647.6
Rotor Current (A) 1793 1680 185 279 375.9
Power Factor 0.062 0.335 0.7737 0.844 0.868
Actual motor data.
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