Variable frequency power converter for ac motor drive

Details Variable frequency power converter for ac motor drive Variable frequency power converter for ac motor drive

1974-04-19

1976-02-17

Shoop, William M.

Electricity: motive power systems

Motor-reversing

Armature or primary circuit control

321 4, 321 10, H02P 540

Patent

active

039393879

ABSTRACT:
In a variable frequency power converter of a current type for driving an AC motor including a rectifier, an inverter, and a smoothing reactor disposed on a DC transmission line between the rectifier and the inverter, there are provided a series circuit having a switching circuit and a smoothing capacitor on the DC input side of the inverter and a feedback circuit having controlled rectifier elements and commutation reactors for feeding back the reactive power of the AC motor. The power converter operates as a current type converter until the output frequency of the converter reaches a predetermined value under the condition that the switching circuit and the controlled rectifier elements are non-conductive, and operates as a voltage type converter when the output frequency has reached the predetermined value under the condition that the switching circuit and the controlled rectifier elements are conductive.

REFERENCES:
patent: 3600658 (1971-08-01), Kuniyoshi
patent: 3854078 (1974-12-01), Hubner

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