Sensorless position detection of a linear actuator using the resonance frequency

Maridor, Joël; Katic, Nikola; Perriard, Yves; Ladas, Dimitrios

doi:10.1109/icems.2009.5382641

Cited by 16 publications

(13 citation statements)

References 7 publications

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“…By measuring current and voltage signals, the actual plunger position can be determined without any external sensor [1], [6], [9]. From Fig.…”

Section: Methods For Sensorless Plunger Position Estimationmentioning

confidence: 99%

“…The inductance is actually the slope of the magnetizing (B/H) curve. From (9), parasitic effects (eddy current) were omitted. Since the denominator contains the current change during the period of interest, this method might be susceptible to noise and a considerable current ripple is essential.…”

Section: A Estimation By Measuring the Flux Linkagementioning

confidence: 99%

“…However, by choosing a relatively low switching frequency, thus higher current ripple, and taking averages of L* the signal to noise ratio can be enhanced. Equation (9) was tested to study the inductance characteristics under different PWM switching frequencies, terminal voltages and external load conditions. Such analyses were not discussed in the mentioned literature.…”

Section: A Estimation By Measuring the Flux Linkagementioning

confidence: 99%

“…As an alternate solution, sensorless position prediction [1], [6] might provide a much more cost efficient yet still robust choice since external or built in sensors become unnecessary. Nowadays, there is much research done on sensorless principle, a few, different solutions published in [1], [5], [8], [9]. Nevertheless, sensorless technique also makes it possible to use switching solenoids in applications where linear control is required [2], [3], thus further reducing the costs.…”

Section: Introductionmentioning

confidence: 99%

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Modelling of a linear proportional electromagnetic actuator and possibilities of sensorless plunger position estimation

Dülk

Kovácsházy

2011

2011 12th International Carpathian Control Conference (ICCC)

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In flow control and in hydraulic systems used in automotive industry, e.g. brakes or automatic transmission units, one of the basic controlling problems is the precise adjustment of oil (fluid) pressure. As an electromechanical actuator, switching and linear variable solenoids are widely used in such applications. In this paper, a magnetic valve is analyzed in details. The main features of the system are highlighted and a proper solenoid model is intended to be established as well. Reliability and cost-efficiency are key requirements for actuators in the field of automotive engineering. For this purpose, sensorless position estimation for linear translational valve actuators is also proposed in this paper. According to this principle, the plunger position could be predicted from the magnetic valve's electrical impedance by using its transducer characteristics during excitation. As a great advantage, an external position or pressure transducer becomes unnecessary thus saving additional costs and further improving system robustness. This paper also presents and studies two different methods for sensorless position prediction which can be implemented under pulse width modulated drive conditions.

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“…By measuring current and voltage signals, the actual plunger position can be determined without any external sensor [1], [6], [9]. From Fig.…”

Section: Methods For Sensorless Plunger Position Estimationmentioning

confidence: 99%

Section: A Estimation By Measuring the Flux Linkagementioning

confidence: 99%

Section: A Estimation By Measuring the Flux Linkagementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Modelling of a linear proportional electromagnetic actuator and possibilities of sensorless plunger position estimation

Dülk

Kovácsházy

2011

2011 12th International Carpathian Control Conference (ICCC)

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“…Additionally, inductance measurement is performed by injecting the sine wave voltage into the winding of the motor. The inductance is measured with phase shift [8] or amplitude [9,10] of the generated current. In the mentioned researches, there is no significant study about position estimation either on load estimation or load effect.…”

Section: Introductionmentioning

confidence: 99%

Sensorless load and position estimation in linear reluctance actuator

Hassani

Shoulaie

2014

IEICE Electron. Express

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Sensorless load and position estimation of linear reluctance actuator is investigated in this paper. Due to wide application of these actuators in several industrial automation systems, sensorless techniques are significant to decrease the cost of the system and increase the reliability in the closed-loop control systems. In this paper, based on dynamic model of the actuator and the characteristics of its subsystems, the possibility of sensorless estimation of mechanical parameters is explored. Considering nonlinear behavior of magnetic subsystem, the position of the plunger could be estimated based on the winding inductance and the excitation current value. Then, the amount of load force could be determined based on current value and estimated position. Laboratory measurements of the actuator's characteristics assist in increasing the accuracy of estimation besides dynamic modeling.

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