This report presents a new compensation method for rotor position distortions, valid in the field weakening region, and suitable for several different distortion orders. The current drawn and the motor torque of electrical drives depend on the motor currents. Distortions in the rotor position cause distortions in the motor currents, and therefore in the current drawn and in the motor torque. These put additional load on the vehicle power supply and create acoustic noise. Hence, an effective compensation for the rotor position related distortions is desirable. The presented distortion analysis shows that the impact of rotor position distortions remains small for low speeds without field weakening and becomes significant in the field weakening region. This makes compensation necessary only in the field weakening. In the field weakening, the rotor position angle takes an almost linear form during one revolution due to the inertia of all revolving parts. Only superimposed distortions cause a non-linear behaviour at this operation point. This is used for developing a new compensation method, which is valid in the field weakening region. The method does not require additional hardware, can be implemented with few resources and is suitable for compensation of several distortion orders. Therefore, it makes an important contribution to reducing load on the vehicle power network and acoustic noise from electrical drives.
Analysis and compensation of rotor position distortions in electrical drives up to the field weakening
2012
15 Seiten, 10 Bilder, 1 Tabelle, 6 Quellen
Aufsatz (Konferenz)
Datenträger
Englisch
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