| 摘要 |
FIELD: electricity.SUBSTANCE: working windings connected in parallel to a load form a closed circuit between each other, which may be supplied from a source of supply. At the same time a part of windings with its group of poles operates in a mode of generation, compensating with its current a decreasing magnetic flow, the other part - in a motor mode, twisting the generator and pulling a counter-electromotive force to the first group. Within a cycle of rotation the sum of electromotive force generation and counter-electromotive forces are equal, but due to active resistance the circuit needs some makeup from a source of supply: an inverter, a microgenerator, an accumulator, or from oscillations of a magnetic flow in stator poles, which is taken by additional windings and after rectification is supplied into an excitation circuit. Besides, the magnetic flow forcedly arises in front of closing poles, if some turns of the winding placed on them are closed at the same time to one of the generator leads. For this purpose a collector may be used, a switchboard operating from a curtain collector or from sensors of rotation or speed of a shaft. At the same time availability of current windings that transfer excitation to poles that are about to generate provides for excitation without a source of supply and a switchboard when reaching a rated mode after receipt of the first current pulse from an accumulator or residual magnetisation. The generator with current excitation may be used for welding, besides, the winding will be phase to any side, both adding and reducing the magnetic flow depending on the welding mode.EFFECT: simplifying switching and control with simultaneous reduction of a number of switching elements and expansion of generator application area.4 cl, 4 dwg |
