Systems and methods for speed regulation of induction motors
AssigneeKing Fahd University of Petroleum and Minerals
InventorSalim Ibrir
Life of this patent
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Abstract
A system for speed regulation of an induction motor including an induction motor configured to be driven by a 3-phase alternating voltage (AC) signal. The system further includes an encoder configured to measure a shaft speed of the induction motor. Further, the system includes a variable frequency drive (VFD) device configured to generate the 3-phase AC signal to drive the induction motor. The system also includes a controller configured to generate a control voltage signal based on the measured shaft speed of the induction motor and a reference speed, the control voltage signal being input to the VFD device to control a frequency of the 3-phase AC signal.
Claims18
A system, comprising:
- an induction motor configured to be driven by a 3-phase alternating voltage (AC) signal;
- an encoder configured to measure a shaft speed of the induction motor;
- a variable frequency drive (VFD) device configured to generate the 3-phase AC signal to drive the induction motor;
- and
- a controller configured to generate a control voltage signal based on the measured shaft speed of the induction motor and a reference speed, the control voltage signal being input to the VFD device to control a frequency of the 3-phase AC signal;
- wherein the control voltage signal is set as uk=−α|ωk−ωkref|βsign(ωk−ωkref), wherein ωk is the measured shaft speed of the induction motor, ωkref ref is the reference speed and α and β are positive real numbers.
A system, comprising:
- an induction motor configured to be driven by a 3-phase alternating voltage (AC) signal;
- an encoder configured to measure a shaft speed of the induction motor;
- a variable frequency drive (VFD) device configured to generate the 3-phase AC signal to drive the induction motor;
- and
- a controller configured to generate a control voltage signal based on the measured shaft speed of the induction motor and a reference speed, the control voltage signal being input to the VFD device to control a frequency of the 3-phase AC signal;
- wherein the control voltage signal is set as uk=−α|ω(t)−ωref(t)|β sign (ω(t)−ωref(t))−γ∫0t|ω(s)−ωref(s)|βsign(ω(s)−ωref(s)ds, wherein ω(t) is the measured shaft speed of the induction motor, ωref(t) is the reference speed, and α, β, and γ are positive real numbers.
A method for a speed regulation of an induction motor of a system, the method comprising:
- measuring, by an encoder of the system, a shaft speed of the induction motor;
- generating, by a controller of the system, a control voltage signal based on the measured shaft speed of the induction motor and a reference speed;
- and
- generating, by a variable frequency drive (VFD) device of the system, a 3-phase alternating voltage (AC) signal to drive the induction motor, a frequency of the 3-phase AC signal being regulated based on the control voltage signal being input to the VFD device;
- wherein the control voltage signal is set as uk=−α|ωk−ωkref|βsign(ωk−ωkref), wherein ωk is the measured shaft speed of the induction motor, ωkref is the reference speed, and α and β are positive real numbers.
A method for a speed regulation of an induction motor of a system, the method comprising:
- measuring, by an encoder of the system, a shaft speed of the induction motor;
- generating, by a controller of the system, a control voltage signal based on the measured shaft speed of the induction motor and a reference speed;
- and
- generating, by a variable frequency drive (VFD) device of the system, a 3-phase alternating voltage (AC) signal to drive the induction motor, a frequency of the 3-phase AC signal being regulated based on the control voltage signal being input to the VFD device;
- wherein the control voltage signal is set as uk=−α|ω(t)−ωref(t)|βsign (ω(t)−ωref(t))−γ∫0t|ω(s)−ωref(s)|βsign(ω(s)−ωref(s))ds, wherein ω(t) is the measured shaft speed of the induction motor, ωref(t) is the reference speed, and α, β, and γ are positive real numbers.
Dependencies are inferred from the claim text.