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Size: 683
Comment:
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Size: 888
Comment:
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| Deletions are marked like this. | Additions are marked like this. |
| Line 19: | Line 19: |
Reactive power supplies resistive drops in the rotor. Run capacitors on big induction motors supply less than a percent of total power to maintain 90 degrees out-of-phase currents in rotor windings. |
Motor Track
Notes
- Tektronix 7000 series oscilloscopes (designed in the 1970s) used 25 KHz switching power supplies
Aluminum resistivity from Physics Hypertextbook ValPolyakov.txt 2004 (missing linefeeds)
Temp |
Resis |
Skin |
60 Hz |
10 KHz |
100 KHz |
K |
ohm m |
mm-√Hz |
mm |
mm |
mm |
200 |
1.6e-8 |
201 |
26 |
2.0 |
0.64 |
300 |
2.7e-8 |
262 |
34 |
2.6 |
0.83 |
400 |
3.9e-8 |
314 |
41 |
3.1 |
0.99 |
600 |
6.1e-8 |
393 |
51 |
3.9 |
1.24 |
800 |
8.7e-8 |
469 |
61 |
4.6 |
1.48 |
Reactive power supplies resistive drops in the rotor. Run capacitors on big induction motors supply less than a percent of total power to maintain 90 degrees out-of-phase currents in rotor windings.