Method for controlling a synchronous electrical machine, corresponding system and motor vehicle comprising the system
AssigneeRENAULT s.a.s.
InventorsAbdelmalek Maloum, Ahmed Ketfi-Cherif
Life of this patent
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Abstract
A method for controlling a permanent magnet synchronous electrical machine powered by a battery delivering a supply voltage to terminals of the battery, the method including: calculating an initial direct voltage component Vdc and an initial quadratic voltage component in a rotating reference; checking a saturation condition; calculating an angle α of a formula; generating voltages to be applied to the electrical machine if α varies negatively and Vdc is positive or if α varies positively and V dc is negative. The method for example can be applied in a control of synchronous electrical machines.
Claims8
A method for controlling a synchronous electrical machine with a permanent magnet powered by a battery delivering a power supply voltage at its terminals, the method comprising:
- computing, via processing circuitry, an initial direct voltage component Vdc and an initial quadratic voltage component Vqc in a revolving reference frame having a plurality of axes;
- verifying, via the processing circuitry, a saturation condition by verifying, in an orthogonal reference frame having the direct voltage components for X-axis and the quadratic voltage components for Y-axis, that a point of coordinates Vdc and Vqc is outside of a range dependent on Vbat and delimited by a contour, Vbat denoting a power supply voltage at terminals of the battery;
- computing, when the saturation condition is verified and via the processing circuitry, an angle
- α
- =
- arctan
-
- (
- Vqc
- Vdc
- )
- ;
- generating, via the battery and when the saturation condition is verified and if α varies negatively and Vdc is positive or if α varies positively and Vdc is negative, a direct axis voltage and quadratic axis voltage by determining a point of intersection between the contour and a straight line passing through the origin of the orthogonal reference frame and the point of coordinates Vdc and Vqc, the direct axis voltage corresponding to the X-axis of the intersection and the quadratic axis voltage corresponding to the Y-axis of the intersection;
- and
- applying to the electrical machine, via the battery and based on the saturation condition, Vdc and α, one of Vdc and Vqc, direct axis voltage and quadratic axis voltage, and a preceding direct axis voltage and preceding quadratic axis voltage.
A system for controlling a synchronous electrical machine with permanent magnet, the system comprising:
- processing circuitry
- configured to compute, at an instant, an initial direct voltage component Vdc and an initial quadratic voltage component Vqc in a revolving reference frame having a plurality of axes,
- configured to verify a saturation condition by verifying, in an orthogonal reference frame having the direct voltage components for X-axis and the quadratic voltage components for Y-axis, that a point of coordinates Vdc and Vqc is outside of a range dependent on Vbat and delimited by a contour, Vbat denoting a power supply voltage at terminals of the battery configured to compute an angle
- α
- =
- arctan
-
- (
- Vqc
- Vdc
- )
- if the saturation condition is verified, and
- a battery configured to
- power the permanent magnet of the electrical machine and configured to generate, when the saturation condition is verified and if α varies negatively and Vdc is positive or if α varies positively and Vdc is negative, a direct axis voltage and quadratic axis voltage to be applied to the electrical machine by determining a point of intersection between the contour and a straight line passing through the origin of the orthogonal reference frame and the point of coordinates Vdc and Vqc, the direct axis voltage corresponding to the X-axis of the intersection and the quadratic axis voltage corresponding to the Y-axis of the intersection, and
- apply to the electrical machine, based on the saturation condition, Vdc and α, one of Vdc and Vqc, direct axis voltage and quadratic axis voltage, and a preceding direct axis voltage and preceding quadratic axis voltage.
Dependencies are inferred from the claim text.