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Title: Methods, systems and apparatus for adjusting duty cycle of pulse width modulated (PWM) waveforms

Patent ·
OSTI ID:1083973
; ; ;

Embodiments of the present invention relate to methods, systems and apparatus for controlling operation of a multi-phase machine in a vector controlled motor drive system when the multi-phase machine operates in an overmodulation region. The disclosed embodiments provide a mechanism for adjusting a duty cycle of PWM waveforms so that the correct phase voltage command signals are applied at the angle transitions. This can reduce variations/errors in the phase voltage command signals applied to the multi-phase machine so that phase current may be properly regulated thus reducing current/torque oscillation, which can in turn improve machine efficiency and performance, as well as utilization of the DC voltage source.

Research Organization:
National Energy Technology Laboratory (NETL), Pittsburgh, PA, Morgantown, WV (United States)
Sponsoring Organization:
USDOE
DOE Contract Number:
FC26-07NT43123
Assignee:
GM Global Technology Operations LLC (Detroit, MI)
Patent Number(s):
8,446,117
Application Number:
12/983,669
OSTI ID:
1083973
Country of Publication:
United States
Language:
English

References (8)

Five level high power motor drive converter and control system patent May 2000
Disturbance-free operation of a multiphase current-regulated motor drive with an opened phase journal January 1994
Motor drive control with a single current sensor using space vector technique patent November 2009
Analysis of Multiphase Space Vector Pulse-Width Modulation Based on Multiple<tex>$d$</tex>–<tex>$q$</tex>Spaces Concept journal November 2005
A novel direct torque control (DTC) method for five-phase induction machines
  • Toliyat, H. A.
  • APEC 2000 - Applied Power Electronics Conference, APEC 2000. Fifteenth Annual IEEE Applied Power Electronics Conference and Exposition (Cat. No.00CH37058) https://doi.org/10.1109/APEC.2000.826100
conference January 2000
Frequency converter overvoltage protection patent November 2007
Modeling and control of a multi-phase induction machine with structural unbalance journal January 1996
On continuous control of PWM inverters in the overmodulation range including the six-step mode journal October 1993

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