Procedure for the regulation of an asynchronous motor
First Claim
1. A method for regulating a stator flux and torque of an asynchronous motor by vector control in an imaginary space vector coordinate system, having a real and an imaginary axis, said method comprising the steps:
- a) selecting said imaginary space vector coordinate system to have a relative position such that a rotor flux vector (Ψ
r) is at least close to the real axis;
b) generating a simulated absolute value of a stator flux (|Ψ
s|)and torque (T) determined in said coordinate system and processing said simulate stator flux and said torque for obtaining a real (usr) and an imaginary (usi) part of a stator voltage and stator frequency (fs);
c) regulating the absolute value of the stator flux (|Ψ
s |) by means of the real part (usr) of the stator voltage vector and regulating the torque (T) by means of the stator frequency (fs); and
d) holding said coordinate system in said relative position by adjusting the imaginary part (usi) of the stator voltage vector.
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Abstract
Procedure for regulating the stator flux and torque of an asynchronous motor by vector control in an imaginary space vector coordinate system, in which procedure the absolute value (|Ψs |) of the stator flux and the torque (M) are determined in said coordinate system, and in which procedure the calculation coordinates are in such a position that the rotor flux (Ψr) is at least close to the real axis. In the procedure of the invention, the absolute value of the stator flux (|Ψs |) is regulated by means of the real part (usr) of the stator voltage and the torque (M) by means of the stator frequency (fs). The calculation coordinates are held in said position by adjusting the imaginary part (usi) of the stator voltage.
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Citations
10 Claims
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1. A method for regulating a stator flux and torque of an asynchronous motor by vector control in an imaginary space vector coordinate system, having a real and an imaginary axis, said method comprising the steps:
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a) selecting said imaginary space vector coordinate system to have a relative position such that a rotor flux vector (Ψ
r) is at least close to the real axis;b) generating a simulated absolute value of a stator flux (|Ψ
s|)and torque (T) determined in said coordinate system and processing said simulate stator flux and said torque for obtaining a real (usr) and an imaginary (usi) part of a stator voltage and stator frequency (fs);c) regulating the absolute value of the stator flux (|Ψ
s |) by means of the real part (usr) of the stator voltage vector and regulating the torque (T) by means of the stator frequency (fs); andd) holding said coordinate system in said relative position by adjusting the imaginary part (usi) of the stator voltage vector. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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Specification