Device comprising a multiphase load, a static converter and indu

Details Device comprising a multiphase load, a static converter and indu Device comprising a multiphase load, a static converter and indu

1993-11-27

1995-04-18

Shoop, Jr., William M.

Electricity: motive power systems

Field or secondary circuit control

Plural, diverse or diversely connected or controlled field...

318529, 363 39, 323356, H02P 528

Patent

active

054081653

ABSTRACT:
The device comprises inductance coils (6) which are each allocated to one phase and which are wound around a common magnetic core in the same direction and with the same number of windings. One each of the inductance coils (6) is connected to one each of the phase leads (3,5) for supplying the multiphase load (4), the connection being made in series between the converter (1) and the load (4). The load can particularly be a multiphase asynchronous motor.
The inductance coils (6) and the magnetic core can be dimensioned equivalent to a power supply transformer adjusted to the frequency and rating of the converter (1), so that deficiencies in the electromagnetic symmetry of the load (4) are balanced, or, on the other hand, they can be dimensioned equivalent to a mains filter adjusted to the frequency and rating of the spikes of converter (1), in order to remove such spikes from the respective phase (3) of the power supply. In such case the inductance coil (6) comprises a central terminal (7) which is connected, via a capacitor (11), with a reference terminal (12) leading to a reference pole of the internal DC power supply of the converter (1), in order to transform the spikes within a ratio of -1:1 and to apply the transformed spikes to the reference terminal (12). Preferably, however, a further capacitor (13) is connected in parallel with each of the inductance coils (6), in order to adjust the resonant frequency of the inductance coil.
An additional coil can be placed on the magnetic core, which may be used as the secondary of a power supply transformer.

REFERENCES:
patent: 3440516 (1969-04-01), Kaiser
patent: 4214196 (1980-07-01), Boyce
patent: 4544877 (1985-10-01), Powell
patent: 4677401 (1987-06-01), Nonaka et al.

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