Angular Voltage Step Excitation Strategy in Induction Machines for Sensorless Position Estimation Using One Single Active Switching State

Montero, Eduardo Rodriguez; Vogelsberger, M. A.; Eberle, Julia; Wolbank, T.M.

doi:10.1109/ecce.2018.8557911

Cited by 2 publications

(7 citation statements)

References 12 publications

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“…This strategy excites the machine with the actual longest SVPWM active state [14]. As a result, the angle of the excitation voltage changes with the six sectors of the fundamental wave.…”

Section: B One Active Angular Voltage Step Excitationmentioning

confidence: 99%

“…For that, previously published strategies compensated excess voltage by the application of the antiparallel vectors [9]- [11], [13]- [15]. This article proposes an excitation path where current ripple is reduced compared to [14]. According to the reference voltage (v ref ) and the minimum active state duration t min , three scenarios can be defined.…”

Section: Low Ripple One-active-excitation Path and Sequencementioning

confidence: 99%

“…7. Feasible fundamental voltage regions using proposed excitation (green), excitation in [14] (magenta), and excitation in [11] (red).…”

Section: Low Ripple One-active-excitation Path and Sequencementioning

confidence: 99%

“…In Fig. 7, the feasible regions of [11] (red), [14] (magenta), and the proposed excitation (green) are shown. The feasible region is defined as the area that the fundamental voltage has to reach during each PWM period so that the current derivative calculations are accurate enough.…”

Section: Low Ripple One-active-excitation Path and Sequencementioning

confidence: 99%

“…As it can be seen, after forming the saliency-offset vector, the signal offset is compensated using the LUT_offset that requires the sector as well as the estimated torque for correct compensation. On a later step, phase shift correction occurs [14]. Afterward, noncontrol saliencies are compensated using the LUT_saliencies that require the electrical and mechanical angle, as well as the estimated torque.…”

Section: Block Diagrammentioning

confidence: 99%

See 4 more Smart Citations

Induction Machine Sensorless Control Based on Saliency Extraction That Uses One Single SVPWM Active State

Montero

Vogelsberger²,

Baumgartner

et al. 2022

IEEE Trans. on Ind. Applicat.

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Some induction motors present saliencies that periodically modify the air-gap flux following a sinusoidal shape. Consequently, these modulations are reflected in the transient leakage inductance. Therefore, transient leakage inductance can be expressed as a constant term or offset, which comes from the symmetrical machine, plus all motor saliency sinusoids, modulated by the mentioned saliencies. Since saliencies are linked to the rotor position or flux, calculation of transient leakage inductance enables encoderless vector control. A way to calculate transient leakage inductance is to excite the machine with voltage steps and estimate the resulting phase current slopes since they are inversely proportional to phase transient inductance. For creating a vector, only the three current slopes resulting from a single active state are sufficient. The vector sum of the three current slopes leads to the so-called saliency-offset vector, which is a vector composed of an offset, which is created due to the contribution of the transient inductance offset, plus several saliency phasors, superposed to the offset. To access saliencies, it is critical to accurately identify the offset of the saliency-offset vector, especially in induction motors since offset is much bigger than saliencies. This article presents an advanced signal processing scheme that identifies the offset in the saliency-offset vector, assuming offset amplitude differs depending on the voltage step applied. Using a feedforward scheme, the offset is eliminated, leading to a saliency vector where rotor slotting can be extracted from. A novel excitation is proposed to reduce additional current distortions coming from the one-active excitation.

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“…This strategy excites the machine with the actual longest SVPWM active state [14]. As a result, the angle of the excitation voltage changes with the six sectors of the fundamental wave.…”

Section: B One Active Angular Voltage Step Excitationmentioning

confidence: 99%