Motor drive control with a single current sensor using space...

Details Motor drive control with a single current sensor using space... Motor drive control with a single current sensor using space...

2007-11-07

2009-11-03

Benson, Walter (Department: 2837)

Electricity: motive power systems

Induction motor systems

Secondary circuit control

C318S400010

Reexamination Certificate

active

07612522

ABSTRACT:
A drive system for a three phase brushless AC motor is arranged to optimize the transistor switching pattern to improve power output whilst allowing current measurement in all of the phases using a single sensor. This is achieved by defining voltage demand vectors x where more than two states are required to meet a minimum state time requirement determined by the single sensor method, and calculating three or more state vectors which produce the demanded vector x whilst still allowing single current sensing. Various methods of optimising the PWM pattern so as to give maximum output whilst using single current sensing are also disclosed.

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Blaabjerg, F. et al: “Single Current Sensor Technique In The DC Link Of Three-Phase PWM- VS Inverters: A Review And A Novel Solution”, IEEE Transaction on Industry Applications, IEEE Service Center, Piscataway, NJ, US, vol. 33, No. 5, Sep. 1997, pp. 1241-1253, XP000739841 ISSN: 0093-9994 — paragraph [OIIA]; figure 3.
Haras, A. Ed—EPE Association: “Space Vector Modulation In Orthogonal And Natural Frames Including The Overmodulation Range”, EPE '97. 7th. European Conference On Power Electronics And Applications. Trondheim, Sept. 8-10, 1997, EPE . European Conference On Power Electronics And Applications, Brussels, EPE Association B, vol. 2 Conf. 7, Sep. 8, 1997, pp. 2237-2342, XP000792303 ISBN: 90-75815-02-6; p. 2.341, left-hand column; figure 12.

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