A Position Estimation Method for Single-Phase Electrical Machines Without Injecting Extra Test Pulses

Koenig, Niklas; Grasso, Emanuele; Merl, Daniel; Nienhaus, Matthias

doi:10.1109/sled.2018.8485843

Cited by 3 publications

(6 citation statements)

References 13 publications

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“…This is especially suitable for end-position detection for switching actuators, where the position is determined after the switching in a quasi-static manner. The following derivation resembles the work [25].…”

Section: Simplified Idim Approachmentioning

confidence: 93%

“…In the simplified approach, the effect of the resistance R Σ is considered small compared to the inductive component [25]. Under this consideration, the ratio between R Σ and L d can be considered small and therefore Equation (9) can be linearized by applying the Taylor expression and truncating it at the first term:…”

Section: Simplified Idim Approachmentioning

confidence: 99%

“…Therefore, it can be written that the current ripple has negligible influence on the mean value of the current: i s (t + s ) ≈ i s,m . Furthermore, by limiting the current dynamic under the assumption of a linear relationship between mean current i s,m and mean voltage u m [25]:…”

Section: Simplified Idim Approachmentioning

confidence: 99%

“…The current ripple with its first order approximation shown in Equation 27resembles a triangle, whose integral value at the time t − e can be calculated as [25]: Finally, the inductance can be estimated by:…”

Section: Simplified Idim Approachmentioning

confidence: 99%

“…The above-mentioned techniques show that the use of a pre-processing hardware increases the SNR while minimizing the computational effort. This inspired the works [25][26][27] introducing the so-called Integrator-Based Direct Inductance Measurement (IDIM) technique, which makes use of an analog integrator for inductance estimation: due to the concept of analog integration, the current ripple can be amplified while the noise is rejected during integration. While [25,26] presented the basic concept of the IDIM approach with several restrictions on the current dynamics, Ref.…”

Section: Introductionmentioning

confidence: 99%

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Analysis of Current Ripples in Electromagnetic Actuators with Application to Inductance Estimation Techniques for Sensorless Monitoring

König¹,

Nienhaus²,

Grasso³

2020

Actuators

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Techniques for estimating the plunger position have successfully proven to support operation and monitoring of electromagnetic actuators without the necessity of additional sensors. Sophisticated techniques in this field make use of an oversampled measurement of the rippled driving current in order to reconstruct the position. However, oversampling algorithms place high demands on AD converters and require significant computational effort which are not desirable in low-cost actuation systems. Moreover, such low-cost actuators are affected by eddy currents and parasitic capacitances, which influence the current ripple significantly. Therefore, in this work, those current ripples are modeled and analyzed extensively taking into account those effects. The Integrator-Based Direct Inductance Measurement (IDIM) technique, used for processing the current ripples, is presented and compared experimentally to an oversampling technique in terms of noise robustness and implementation effort. A practical use case scenario in terms of a sensorless end-position detection for a switching solenoid is discussed and evaluated. The obtained results prove that the IDIM technique outperforms oversampling algorithms under certain conditions in terms of noise robustness, thereby requiring less sampling and calculation effort. The IDIM technique is shown to provide a robust position estimation in low-cost applications as in the presented example involving a end-position detection.

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Section: Simplified Idim Approachmentioning

confidence: 93%

Section: Simplified Idim Approachmentioning

confidence: 99%

Section: Simplified Idim Approachmentioning

confidence: 99%

Section: Simplified Idim Approachmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Analysis of Current Ripples in Electromagnetic Actuators with Application to Inductance Estimation Techniques for Sensorless Monitoring

König¹,

Nienhaus²,

Grasso³

2020

Actuators

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An Improved IDIM Technique for Sensorless Control of Single-Phase Electromagnetic Drives

Koenig

Anzelmi

Naso

et al. 2019

2019 IEEE 10th International Symposium on Sensorless Control for Electrical Drives (SLED)

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A Solution to Ambiguities in Position Estimation for Solenoid Actuators by Exploiting Eddy Current Variations

König

Nienhaus

2020

Sensors

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Position estimation techniques for solenoid actuators are successfully used in a wide field of applications requiring monitoring functionality without the need for additional sensors. Most techniques, which also include standstill condition, are based on the identification of the differential inductance, a parameter that exhibits high sensitivity towards position variations. The differential inductance of some actuators shows a non-monotonic dependency over the position. This leads to ambiguities in position estimation. Nevertheless, a unique position estimation in standstill condition without prior knowledge of the actuator state is highly desired. In this work, the eddy current losses inside the actuator are identified in terms of a parallel resistor and are exploited in order to solve the ambiguities in position estimation. Compared to other state-of-the-art techniques, the differential inductance and the parallel resistance are estimated online by approaches requiring low implementation and computation effort. Furthermore, a data fusion algorithm for position estimation based on a neural network is proposed. Experimental results involving a use case scenario of an end-position detection for a switching solenoid actuator prove the uniqueness, the precision and the high signal-to-noise ratio of the obtained position estimate. The proposed approach therefore allows the unique estimation of the actuator position including standstill condition suitable for low-cost applications demanding low implementation effort.

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A Position Estimation Method for Single-Phase Electrical Machines Without Injecting Extra Test Pulses

Cited by 3 publications

References 13 publications

Analysis of Current Ripples in Electromagnetic Actuators with Application to Inductance Estimation Techniques for Sensorless Monitoring

Analysis of Current Ripples in Electromagnetic Actuators with Application to Inductance Estimation Techniques for Sensorless Monitoring

An Improved IDIM Technique for Sensorless Control of Single-Phase Electromagnetic Drives

A Solution to Ambiguities in Position Estimation for Solenoid Actuators by Exploiting Eddy Current Variations

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