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A RESEARCH OF NEW SCHERBIUS SYSTEM WITH HIGH POWER FACTOR
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| Author(s) |
T. Jinxian |
| Abstract |
In this paper a theoretical analysis of commercial use of the Scherbius (cascade) system and a new idea to improve the power factor are given. It is shown that the speed-torque characteristics of the Scherbius system in various speed slip states can be represented by a simple formula. The maximum torque of that system is less than them maximum torque in proper operation, but it remains constant while the speed is regulated. The power factor of the common Scherbius system is very low (about 0.5 to 0.6). In order to increase it the author and co-workers have developed a new system which is based on the use of a forced commutation converter. The vector diagram and calculating formula are given. The power factor of this new system may reach 0.9 and even exceed it. Three industrial devices of this type have been operating in three factories. The largest device is a 245 KW motor which has a speed regulating domain of 40%. The experimental results are also shown in the paper. In one year an amount of 110 KWH electro-energy is saved by increasing the power factor. Compared to the use of the slip-difference machine, the use of the new system saves 440 KWH electro-energy in one year. The control of this new system is as simple as that of the common Scherbius system. |
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| Filename: | Unnamed file |
| Filesize: | 3.574 MB |
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| Type |
Members Only |
| Date |
Last modified 2021-03-10 by System |
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