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THREE PHASE AC CHOPPER FOR SWITCHING INDUCTION MOTOR WITHOUT TRANSIENTS
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| Author(s) |
W. Deleroi |
| Abstract |
The well known three-phase thyristor chopper is investigated for switching processes of induction machines applications. The basic principle of such chopper is the delayed firing of its six thyristors to control the behaviour of the machine. The simulation of this chopper machine system shows three modes of operation, the three-phase mode, the single-phase mode and the non-connected mode. All these modes can be calculated analytically by solving the differential equations. For all firing angles the steady state operation points can be found and also all dynamic situations can be calculated. In this way the switching in by the three-phase chopper is investigated using a phase modulation of firing angle to avoid all transients. During this operation all torque pulsations disappear and a smooth shape is found. That is possible when the rate of building up the main flux is decreased. Also the soft start of an induction machine can be realized without transients and a nearly constant torque up to rated speed. |
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| Filename: | Unnamed file |
| Filesize: | 3.4 MB |
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| Type |
Members Only |
| Date |
Last modified 2021-02-04 by System |
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