Electricity: motive power systems – Induction motor systems – Primary circuit control
Patent
1987-09-29
1988-10-11
Smith, Jr., David
Electricity: motive power systems
Induction motor systems
Primary circuit control
318800, H02P 540
Patent
active
047774231
ABSTRACT:
A method for reducing the instantaneous voltage ripple of an electrical drive which is fed by a current intermediary circuit frequency converter with phase sequence quenching. During pulsed operation of asynchronous rotating machinery, driven by a current intermediary circuit frequency converter with phase sequence quenching, an interfering instantaneous voltage ripple occurs due to the inverter minimum time required for the completion of a complete commutation. The operating capacity of the inverter is not imparied, even if the switch-on time of individual thyristors falls below the minimum time. Depending on the degree of incomplete commutation occurring in the process, a difference is made beween one of a "first kind" and one of the "second kind" and, in the case of the second kind, the duration of the actual switch-on pulses for maintaining a linear relationship between the current time area and the nominal pulse duration is advantageously adapted through a correction function.
REFERENCES:
patent: 3824437 (1974-07-01), Blaschke
patent: 4028600 (1977-06-01), Blaschke et al.
patent: 4707777 (1987-11-01), Cho
Siemens Aktiengesellschaft
Smith Jr. David
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