Vector Control of Three-Phase AC Machines: System Development in the Practice

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Are you sure you want to Yes No. No Downloads. Views Total views. Actions Shares. Embeds 0 No embeds. No notes for slide. Torque generated by the drive causes the induction motor to run at synchronous speed less the slip. If the load drives the motor faster than synchronous speed, the motor acts as a generator , converting mechanical power back to electrical power.

This power is returned to the drive's DC link element capacitor or reactor. A DC-link-connected electronic power switch or braking DC chopper controls dissipation of this power as heat in a set of resistors. Cooling fans may be used to prevent resistor overheating. Dynamic braking wastes braking energy by transforming it to heat. By contrast, regenerative drives recover braking energy by injecting this energy into the AC line.

The capital cost of regenerative drives is, however, relatively high. Regenerative AC drives have the capacity to recover the braking energy of a load moving faster than the designated motor speed an overhauling load and return it to the power system. Cycloconverter, Scherbius, matrix, CSI, and LCI drives inherently allow return of energy from the load to the line, while voltage-source inverters require an additional converter to return energy to the supply. Regeneration is useful in VFDs only where the value of the recovered energy is large compared to the extra cost of a regenerative system, [85] and if the system requires frequent braking and starting.

Regenerative VFDs are widely used where speed control of overhauling loads is required. Before solid-state devices became available, variable-frequency drives used rotary machines and the General Electric Company obtained several patents for these in the early 20th century. One example is U. Patent 0,, of which states: "Such a generator finds a useful application in supplying current to induction motors for driving cars, locomotives, or other mechanism which are to be driven at variable speeds". From Wikipedia, the free encyclopedia.

See also: Dqo transformation and Alpha—beta transformation. Table 1: Drives by machines. Table 3: Topology diagrams. Legend for Tables 1 to 3.

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Main article: Shaft voltage. See also: Dynamic braking and Regenerative braking. New York: Marcel Dekker, Inc.

Controlling Power Transmission Systems. Electrical Control Systems in Industry. Archived from the original on April 28, Retrieved March 27, Archived from the original PDF on Retrieved Amsterdam: Academic. Sep 1, Control Engineering. Reed Business Information. May 18, Jan Bibcode : ITPE Hardware-Part 2: slide 2 of 9. Archived from the original on April 19, Retrieved April 18, Bibcode : asad.

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Retrieved 18 April Doha, Qatar. Archived from the original PDF on May 2, Retrieved February 8, Retrieved 22 May Retrieved Apr 20, June Retrieved Jan 27, Feb Retrieved Apr 18, International Energy Agency. Retrieved Mar 22, Archived from the original PDF on 18 July Retrieved 7 September Retrieved Mar 16, Proceedings of the IEEE.

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  • Society of Petroleum Engineers. July 19, Retrieved Feb 3, Feb 1, European Conference on Power Electronics and Applications. Chapter 6—8, especially pp. May Archived from the original PDF on October 27, Retrieved January 29, Burlington, MA: Academic. Lappeenranta University of Technology. May 17, Retrieved Jul 29, Jan—Feb Retrieved Feb 14, Retrieved Feb 15, Itasca, IL: PtmanMedia: 1—2.

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    • Dec 1, Retrieved June 14, April 11, Archived from the original PDF on November 17, Retrieved July 29, Oak Ridge National Laboratory. Retrieved 26 September Fundamentals of Electrical Drives 2 ed. Pangbourne: Alpha Science Int. Retrieved 28 January Electric motors.

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      Vector Control of Three-Phase AC Machines

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      Vector Control of Three-Phase AC Machines (eBook)

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