Nonlinear observer for electromagnetic position estimation using active current control

In the paper the principle and performances of the pulsating current injection based sensorless control of permanent magnet synchronous motor (PMSM) are analyzed theoretically and investigated by simulations. In the analyses, the effects of the speed EMF terms and the deviation between the actual d-axis high-frequency current and the command, which results from the limited gain and bandwidth of the current control loop, are all taken into account. It is shown that the pulsating current injection method can achieve stable position estimation in a wide speed range. But appreciable position errors will result at high speeds due to the cross-coupling effects of the speed EMFs and the tracking error between the actual and command carrier current. In order to improve the performance, a modified scheme is proposed. Its validity is confirmed by simulations.

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Linear Position Estimation on Smart Actuators Using a Nonlinear Observer

2019 American Control Conference (ACC) ◽

10.23919/acc.2019.8814729 ◽

2019 ◽

Author(s):

Hamidreza Movahedi ◽

Ali Zemouche ◽

Rajesh Rajamani

Keyword(s):

Position Estimation ◽

Nonlinear Observer ◽

Smart Actuators

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Landmark based nonlinear observer for rigid body attitude and position estimation

2007 46th IEEE Conference on Decision and Control ◽

10.1109/cdc.2007.4434417 ◽

2007 ◽

Cited By ~ 22

Author(s):

J.F. Vasconcelos ◽

R. Cunha ◽

C. Silvestre ◽

P. Oliveira

Keyword(s):

Rigid Body ◽

Position Estimation ◽

Nonlinear Observer ◽

Body Attitude

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Acoustic Noise Reduction of BLDC Motor Drive Using One-Cycle Current Control Strategy

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.704.385 ◽

2014 ◽

Vol 704 ◽

pp. 385-389

Author(s):

Hassan Moghbelli ◽

Abolfazl Halvaei Niasar ◽

Ehsan Boloor Kashani

Keyword(s):

Control Strategy ◽

Acoustic Noise ◽

Torque Ripple ◽

Position Estimation ◽

Current Control ◽

Motor Drive ◽

Bldc Motor ◽

Constant Frequency ◽

Noise And Vibration ◽

Brushless Dc

Torque ripple and resulted acoustic noise and vibration are the main disadvantages of brushless DC (BLDC) motor drives. In this study, One-Cycle Control (OCC) is developed for current regulation of brushless DC (BLDC) motor drive as a unified constant-frequency integration control strategy. Employing one-cycle control strategy reduces high frequency torque ripple of conventional hysteresis current controllers leading to lower acoustic noise and vibration in the drive. To enhance reliability and reducing drive cost, an improved rotor position estimation technique is implemented. OCC strategy and sensorless method are realized using a low-cost general-purpose AVR microcontroller (Atmega8). It is shown that torque ripple, acoustic noise and vibration are reduced via OCC method comparing to conventional hysteresis control strategy. Computer simulations and experimental results with a 375W, 16 poles BLDC motor, demonstrate improved behavior of developed sensorless BLDC drive operation.

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