System and method for clamp current regulation of induction machines
First Claim
1. A device to regular current produced by an induction machine comprising:
- an induction motor responsive to a plurality of phase current signals, said motor producing torque for application on a shaft;
a processing and drive circuit responsive to a direct current command signal and a quadrature current command signal, said processing and drive circuit for producing a plurality of phase current signals for input into said induction motor;
a command circuit responsive to said plurality of phase current signals, to an angular position of said shaft, and to a current input command signal for producing a direct current error signal and a quadrature current error signal;
a control circuit responsive to the direct and quadrature current error signals for producing direct and quadrature voltage signals; and
a limiter for limiting the direct and quadrature voltage signals to a selected level.
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Accused Products
Abstract
A device to regulate current produced by an induction machine responsive to a plurality of phase current signals. The motor produces torque for application on a shaft. A processing and drive circuit responsive to a direct current command signal and a quadrature current command signal produces phase current signals for input to the motor. A command circuit responsive to the phase current signals, an angular position of said shaft, and a voltage input command signal to produce a direct current error signal and a quadrature current error signal. A control circuit responsive to the direct and quadrature current error signals produces the direct voltage signal command and the quadrature signal command. The control circuit has a direct and quadrature proportional gain, integrator and clamp circuits. An algorithm produces limited or clamped voltage modulation index signals to obtain maximum efficiency and maximum torque per ampere in the speed range.
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Citations
26 Claims
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1. A device to regular current produced by an induction machine comprising:
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an induction motor responsive to a plurality of phase current signals, said motor producing torque for application on a shaft;
a processing and drive circuit responsive to a direct current command signal and a quadrature current command signal, said processing and drive circuit for producing a plurality of phase current signals for input into said induction motor;
a command circuit responsive to said plurality of phase current signals, to an angular position of said shaft, and to a current input command signal for producing a direct current error signal and a quadrature current error signal;
a control circuit responsive to the direct and quadrature current error signals for producing direct and quadrature voltage signals; and
a limiter for limiting the direct and quadrature voltage signals to a selected level. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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- 13. A method to regulate current produced by an induction machine comprising limiting each of the respective direct and quadrature voltages Vds and Vqs to selected value range which together represent the magnitude and direction of a resulting voltage vector.
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20. A method to regulate current produced by an induction machine comprising the steps of:
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inputting a direct current command signal and a direct current feedback signal into a first circuit;
subtracting said direct current feedback signal from said direct current command signal to produce a first direct current error;
inputting said direct current error signal into a first proportional controller to produce a first direct voltage signal command;
inputting said direct current error signal into a first integrator to produce a second direct voltage signal command;
inputting said second direct voltage signal command into a first limiter to produce a third direct voltage signal command;
adding said third direct voltage signal command with said first direct voltage signal command to produce an unclamped direct voltage signal command;
inputting said unclamped direct voltage signal command into a second limiter to produce a direct synchronous voltage signal command;
inputting a quadrature current feedback signal and a quadrature current command signal into a second circuit;
subtracting said quadrature current feedback signal to said quadrature current command signal to produce a quadrature current error signal;
inputting said quadrature current error signal into a second proportional controller to produce a first quadrature voltage signal command;
inputting said quadrature current error signal into a second integrator to produce a second quadrature voltage signal command;
inputting said second quadrature voltage signal command into a third limiter to produce a third quadrature voltage signal command;
adding said third quadrature voltage signal command with said first quadrature voltage signal command to produce an unclamped quadrature voltage signal command; and
inputting said unclamped quadrature voltage signal command into a fourth limiter to produce a quadrature synchronous voltage signal command. - View Dependent Claims (21, 22, 23, 24)
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25. A device to regulate current produced by an induction machine comprising:
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an induction motor responsive to a plurality of phase current signals, said motor producing torque for application on a shaft;
a processing and drive circuit responsive to a direct current command signal and a quadrature current command signal, said processing and drive circuit for producing a plurality of phase current signals for input into said induction motor;
a command circuit responsive to said plurality of phase current signals, to an angular position of said shaft, and to a current input command signal for producing a direct current error signal and a quadrature current error signal; and
a control circuit responsive to said direct and quadrature current error signals, said control circuit having a first portion and a second portion, wherein said first portion includes a first proportional integrator and a first clamp means connected thereto, for producing the direct voltage signal command, said second portion includes a second proportional integrator and second clamp means connected thereto for producing the quadrature direct voltage signal command.
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26. A method for regulating current produced by an induction machine driven by direct and quadrature signals comprising the steps of:
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subtracting a direct current signal from a direct current signal command to produce a first direct error signal;
proportionally integrating the direct error signal to produce the proportionally integrated direct signal command;
limiting the proportionally integrated first direct signal command to produce the direct signal command;
subtracting a quadrature current signal from a quadrature current signal command to produce a quadrature direct error signal command;
proportionally integrating the quadrature signal command to produce a proportionally integrated quadrature signal command;
limiting the proportionally integrated quadrature signal to produce a quadrature signal command.
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Specification