Drives smooth harmonics and regenerate loads: use of multiple, modular inverter drives offers a lower cost way of improving EMC and achieving four-quadrant regenerative operation

Article Abstract:

Modular inverter drives able to work in either direction, can be used to configure systems producing virtually no mains harmonics, without the need for special builds. The EMC needs of of several inverters can been served by one inverter in reverse. Modules have been designed to be used in either direction, forming the basis of inverter drives ranging between four and 90, in the normal forward directions. Applications for harmonic suppression include pumping stations.

Innovations

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The future of inverter drives

Article Abstract:

Inverter drives are already highly sophisticated and further developments could lead to smoother, more stable and reliable operation. There is intense competition between manufacturers of AC inverters and software has helped improve autotuning. Hitachi has developed drives that adapt to changed circumstances using fuzzy logic. Drive responsiveness has improved to achieve full torgque in 30ms.

Motors

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Chip-on-chip makes smallest inverter

Article Abstract:

Applications for Mitsubishi's new AC inverter drive on a chip could include brown and white goods, along with pumps, fans and automation systems. It is made up of logic circuitry sitting on top of power circuitry, and features very small and inexpensive motor speed control. It is relatively expensive to produce, but reduces costs by cutting down on the overall number of components required.

Power, Distribution, and Specialty Transformer Manufacturing, Power Inverters, Electrical Industrial Apparatus, Mitsubishi Corp., Power converters

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