Improved method for higher dynamics in sensorless position detection

Leidhold, Roberto; Mutschler, P.

doi:10.1109/iecon.2008.4758132

Cited by 36 publications

(17 citation statements)

References 7 publications

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“…However, because the real rotor position is not available, the injected voltage signal actually differs from the one injected at the real d-axis, (15). The injection voltage in the estimated rotor reference frame can be rewritten with consideration of the estimated rotor position error as…”

Section: B Pulsating Voltage Signal Injection In the Estimated Rotormentioning

confidence: 99%

PWM Switching Frequency Signal Injection Sensorless Method in IPMSM

Kim

Park

Sul

2012

IEEE Trans. on Ind. Applicat.

218

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The rotor position of an interior permanent-magnet synchronous machine (IPMSM) can be estimated without a position sensor by signal injection sensorless control at standstill and/or in very low speed rotating condition. In the signal injection sensorless control, however, the fundamental control performance is limited by the frequency of the injected signal, and no negligible acoustic noise is generated. If the frequency of the injected voltage signal would increase to pulsewidth modulation (PWM) switching frequency and if the switching frequency is near or above audible range, the dynamics of the sensorless control can be improved, and the acoustic noise can be remarkably reduced or totally eliminated. This paper describes how to extract the rotor position information of IPMSM using the voltage signal injection whose frequency is the same as the PWM switching frequency. Compared to the conventional heterodyning process, the proposed method is simple to implement and appropriate for PWM switching frequency signal injection. The high-frequency voltage signal can be injected in the stationary reference frame or in the estimated rotor reference frame. In this paper, the 5-and 16-kHz signal injections are proposed, implemented, and compared. The experimental results confirm the effectiveness of the proposed method.

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Section: B Pulsating Voltage Signal Injection In the Estimated Rotormentioning

confidence: 99%

PWM Switching Frequency Signal Injection Sensorless Method in IPMSM

Kim

Park

Sul

2012

IEEE Trans. on Ind. Applicat.

218

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“…The low-pass filtered feedback to the current controller limits the achievable bandwidth of the current control loop. Also the bandwidth of the position observer is limited by the group delay of the introduced band-pass filter [11]. Furthermore the band-pass filter cannot completely eliminate the fundamental wave current in the high frequency information during torque transients [16], [17].…”

Section: Introductionmentioning

confidence: 99%

High-resolution sensorless position estimation using delta-sigma-modulated current measurement

Hammel

Kennel

2011

2011 IEEE Energy Conversion Congress and Exposition

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Sensorless speed and position control of surface mounted permanent magnet synchronous machines (SMPMSMs) is of special interest in industrial automation due to their high efficiency and simple design. However these types of machines have no geometrical saliencies and the exploitable magnetic anisotropies result solely from magnetic saturation and are therefore very small. The measurable position dependent current components resulting from injected high frequency voltages are hence very small and a high resolution current measurement is needed.This paper proposes a novel technique for injecting an alternating carrier voltage. The high frequency current components are measured using delta-sigma-modulators. Suitable design of the low-pass filters and appropriate processing of the measured current values allows to achieve a very high signal to noise ratio. The proposed analytical approach to separate the high frequency current components from the fundamental wave current portion avoids any interference between the current controller and the high frequency voltage injection. Therefore the extracted position information will not be affected by the fundamental current components even during transient conditions. The separation scheme is free of any motor parameters and can cope with significant nonlinear inductances.

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“…Many sensorless techniques have been studied and these techniques can be classified into two categories: techniques based on back-EMF [3] and techniques based on saliency in spatial impedance of the motor [4]- [11].…”

Section: Introductionmentioning

confidence: 99%

“…These methods can be applied to general AC machines and they show reasonable torque control capability at zero and/or low frequency, even under heavily loaded condition. Recently, square-wave voltage injection methods in [10], [11] have been proposed. Due to the square-wave injection scheme, the position error signal of them can be calculated without any Low Pass Filters (LPF), and that means that it could obtained without time delay, which is crucial to extend the bandwidth of the sensorless control.…”

Section: Introductionmentioning

confidence: 99%

Sensorless control for induction machines using square-wave voltage injection

Yoon

Sul

2010

2010 IEEE Energy Conversion Congress and Exposition

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This paper presents a sensorless control for induction machines using a square-wave voltage injection. Multiple saliencies and a saliency orientation shift are considered in this paper. The multiple saliencies make the position error signal distorted and the estimation of the flux position difficult. And, due to the saliency orientation shift, the estimated rotor flux position drifts from the actual rotor flux position according to torque and speed. When the square-wave voltage is injected into the estimated synchronous reference d-q frame, the error signal has lower harmonics than that of the conventional sinusoidal injection method. In addition, by injecting the square-wave into q axis of the estimated synchronous reference frame, the flux can be estimated with less error compared to the injection into d axis. Because of the enhanced rotor flux estimation performance, the square wave injection into q axis reveals better torque controllability compared to the sine wave injection into d axis.

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Improved method for higher dynamics in sensorless position detection

Cited by 36 publications

References 7 publications

PWM Switching Frequency Signal Injection Sensorless Method in IPMSM

PWM Switching Frequency Signal Injection Sensorless Method in IPMSM

High-resolution sensorless position estimation using delta-sigma-modulated current measurement

Sensorless control for induction machines using square-wave voltage injection

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