Method for determining the inductances of a permanent magnet synchronous machine
First Claim
1. A control method implemented in a variable speed drive for determining flux and torque inductances of a permanent magnet synchronous machine comprising three phases, each oriented in a direction, a stator and a rotor, said method comprising:
- applying, for a predetermined duration in the direction of each phase, a voltage vector in a positive direction, and a voltage vector in a negative direction;
measuring a current response in each phase after applying the voltage vectors in the two directions, the current response comprising, for each phase, a positive peak and a negative peak;
determining an angle for the position of the rotor in relation to the stator based on the asymmetries between the positive peaks and the negative peaks of the current responses measured in the phases; and
determining the flux and torque inductances of the machine as a function of the determined angle, whereinfor each phase, the voltage vector applied in the positive direction and the voltage vector applied in the negative direction have one and the same norm.
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Abstract
The invention relates to a control method implemented in a variable speed drive for determining the inductances (Ld, Lq) of a permanent magnet synchronous machine comprising three phases (a, b, c), each oriented along a direction, a stator, and a rotor. For each phase, one after the other, said method includes steps of: applying, along the direction of the phase (a, b, c), a voltage vector (V1, V3, V5) in the positive direction and a voltage vector (V2, V4, V6) in the negative direction for a predetermined duration; measuring the current obtained in the phase after applying the voltage vectors in both directions; determining an angle (θr) for the position of the rotor in relation to the stator based on the measured current; and determining the flow (Ld) and torque (Lq) inductances of the machine based on the predetermined angle (θr).
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Citations
8 Claims
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1. A control method implemented in a variable speed drive for determining flux and torque inductances of a permanent magnet synchronous machine comprising three phases, each oriented in a direction, a stator and a rotor, said method comprising:
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applying, for a predetermined duration in the direction of each phase, a voltage vector in a positive direction, and a voltage vector in a negative direction; measuring a current response in each phase after applying the voltage vectors in the two directions, the current response comprising, for each phase, a positive peak and a negative peak; determining an angle for the position of the rotor in relation to the stator based on the asymmetries between the positive peaks and the negative peaks of the current responses measured in the phases; and determining the flux and torque inductances of the machine as a function of the determined angle, wherein for each phase, the voltage vector applied in the positive direction and the voltage vector applied in the negative direction have one and the same norm. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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Specification