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1. (WO2018077718) METHOD AND APPARATUS FOR ADAPTING THE MAGNETIC CHARACTERISTICS OF A SYNCHRONOUS RELUCTANCE MOTOR
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CLAIMS

1. A method of automatically adapting the magnetic characteristics of a synchronous reluctance motor (2), of the type that comprises a stator (3) housing a rotor (4) therein and defining at least one pair of axes (D, Q) respectively of minimum and maximum magnetic reluctance, a control unit (5) for controlling the electrical feeding of the motor, wherein the motor has predetermined rated current (I) and rated voltage (V) values obtained on the bench and wherein the supply current has components (id, iq) along the axes of minimum and maximum reluctance, which method comprises the steps of applying a predetermined number (m, n) of voltage and current variations (dV, dl) to the stator of with a predetermined frequency (f), determining differential inductances
in response to said voltage and current variations, calculating the motor flux curves (λd, λq) by integrating said differential inductances (Lditf) and mapping of said curves in said control unit for automatically adapting the magnetic characteristics of the motor with substantially the same accuracy as that of a bench test, wherein said predetermined number (m, n) of voltage and current variations is relatively small as compared with the number of measurements experimentally taken on bench.

2. Method as claimed in claim 1 , characterized by providing a first step (a) of detecting the angular rotor position (a) relative to the minimum reluctance axis (D) for establishing a stationary position of alignment to said axis (D).

3. Method as claimed in claim 2, characterized in that said first step (a) is carried out by applying to the stator (3) a current impulse of predetermined value equal to about the nominal current (I) to promote rotation of the rotor by a predetermined angle (or) and obtain the alignment of the rotor (4) to the minimum reluctance axis (D).

4. Method as claimed in claim 2, characterized in that said step (a) is obtained by identification of the angular position (a) by voltage or current injection and use of such position (a) as reference for the further calculation along axes (D and Q) in absence of rotation of the rotor (4).

5. Method as claimed in claim 2, characterized in that once said rotor angular alignment step (a) a step (b) has taken place, an injection step is effected to inject in the stator a first (m) of current variations (Ald) of first values (tdmWm) along said minimum reluctance axis, said variations having a gradually increasing and stepped mean value with a first maximum value (Idmax) higher than the nominal current (I) to provide saturation of the stator along said minimum reluctance axis (D) while keeping the current component (iq) along the maximum reluctance axis (Q) equal to zero.

6. Method as claimed in claim 5, characterized in that said first maximum current value (Idmax) is equal to about 150% of the nominal current (I),

7. Method as claimed in claim 5 or 6, characterized by providing a measure step (c) for measuring the voltage (Vd) and current (Id) along the maximum reluctance axis responsive to said first current values increasing by steps to obtain first measured values (Vd, Id).

8. Method as claimed in claim 5, characterized by providing a second injection step (d) for injecting a second number (n) of current variations (lq) with second current values (lqmax/n) along said maximum reluctance axis, said variations having a gradually increasing and stepped mean value with a second predetermined maximum value (Idmax) lower than the nominal current (I) to keep the rotor in said stationary alignment

position, and the current component (id) along the minimum reluctance axis (D) equal to zero.

9. Method as claimed in claim 8, characterized in that said second maximum current value (Idmax) is equal to about 15% of nominal current (I).

10. Method as claimed in the preceding claims, characterized by providing a measuring step (e) of measuring voltage (Vq) and current (lq) along the minimum reluctance axis (Q) in response to said second increasing stepped variations injected in step (d) to obtain second measured values


11. Method as claimed in the preceding claims, characterized by comprising a calculation step (f) of computing said first (Vd, id) and said second measured values to determine appropriate motor

parameters


12. Method as claimed in claim 1 1 , characterized by comprising a determination step (g) of determining said differential values (LdHf) starting from said specific parameters according to

the functions [1], [2], [3] and [4] below:

13. Method as claimed in the preceding claims, characterized in that said steps a) to g) are controller by an algorithm that is initialized in said control unit to compute said differential inductances (λdl λq) and map said flux curves of the motor with an accuracy comparable with that can be obtained in test laboratory.

14. Method as claimed in claim 13, characterized in that the mapping of said flux curves (λd, λq) are applied in said algorithm to automatically adapt the magnetic characteristics of the motor in the best mode.

15. An apparatus (1) for automatically adapting the magnetic characteristics of a synchronous reluctance motor (2), comprising a stator (3) lodging a rotor (4) internally thereof and defining at least one pair of axes (D, Q) of minimum and maximum magnetic reluctance, means for electrical feeding the motor, wherein the nominal current (I) and the nominal voltage (V) are label data previously measured by bench test, characterized by comprising:

- an electric impulse applicator configured to provide rotation of the rotor by a predetermined angle and alignment thereof to the minimum reluctance axis (D);

- an electronic injector configured to apply to the stator a predetermined minimum number of voltage and current variations (dV, dl) with a predetermined frequency (f);

- a voltage and current measuring device for determining the stator differential inductances (Lditf) in response to said voltage and current variations (dV, dl) with a predetermined frequency (f);

- filtering means for determining differential inductances (Lditf) in response to said variations;

- a control unit (5) configured to compute the motor flux curves (λd, λq) by "integration of said differential inductances (Ldiff) and map said curve to automatically adapt the magnetic characteristics of the motor with an accuracy substantially equal to that obtainable by bench testing.