Discrete-time observer design for sensorless synchronous motor drives

Hafiz Asad Ali Awan; Toni Tuovinen; Seppo E. Saarakkala; Marko Hinkkanen

doi:10.1109/TIA.2016.2572105

Discrete-time observer design for sensorless synchronous motor drives

Hafiz Asad Ali Awan, Toni Tuovinen, Seppo E. Saarakkala, Marko Hinkkanen

ABB Oy Drives

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Abstract

This paper deals with the speed and position estimation of interior permanent-magnet synchronous motor (IPM) and synchronous reluctance motor (SyRM) drives. A speed-adaptive full-order observer is designed and analyzed in the discrete-time domain. The observer design is based on the exact discrete-time motor model, which inherently takes the delays in the control system into account. The proposed observer is experimentally evaluated using a 6.7-kW SyRM drive. The analysis and experimental results indicate that major performance improvements can be obtained with the direct discrete-time design, especially if the sampling frequency is relatively low compared to the fundamental frequency. The ratio below 10 between the sampling and fundamental frequencies is achieved in experiments with the proposed discrete-time design.

Original language	English
Pages (from-to)	3968-3979
Journal	IEEE Transactions on Industry Applications
Volume	52
Issue number	5
DOIs	https://doi.org/10.1109/TIA.2016.2572105
Publication status	Published - 24 May 2016
MoE publication type	A1 Journal article-refereed

Keywords

modeling errors
observer
speed sensorless
stability conditions

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10.1109/TIA.2016.2572105

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title = "Discrete-time observer design for sensorless synchronous motor drives",

abstract = "This paper deals with the speed and position estimation of interior permanent-magnet synchronous motor (IPM) and synchronous reluctance motor (SyRM) drives. A speed-adaptive full-order observer is designed and analyzed in the discrete-time domain. The observer design is based on the exact discrete-time motor model, which inherently takes the delays in the control system into account. The proposed observer is experimentally evaluated using a 6.7-kW SyRM drive. The analysis and experimental results indicate that major performance improvements can be obtained with the direct discrete-time design, especially if the sampling frequency is relatively low compared to the fundamental frequency. The ratio below 10 between the sampling and fundamental frequencies is achieved in experiments with the proposed discrete-time design.",

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AU - Saarakkala, Seppo E.

AU - Hinkkanen, Marko

PY - 2016/5/24

Y1 - 2016/5/24

N2 - This paper deals with the speed and position estimation of interior permanent-magnet synchronous motor (IPM) and synchronous reluctance motor (SyRM) drives. A speed-adaptive full-order observer is designed and analyzed in the discrete-time domain. The observer design is based on the exact discrete-time motor model, which inherently takes the delays in the control system into account. The proposed observer is experimentally evaluated using a 6.7-kW SyRM drive. The analysis and experimental results indicate that major performance improvements can be obtained with the direct discrete-time design, especially if the sampling frequency is relatively low compared to the fundamental frequency. The ratio below 10 between the sampling and fundamental frequencies is achieved in experiments with the proposed discrete-time design.

AB - This paper deals with the speed and position estimation of interior permanent-magnet synchronous motor (IPM) and synchronous reluctance motor (SyRM) drives. A speed-adaptive full-order observer is designed and analyzed in the discrete-time domain. The observer design is based on the exact discrete-time motor model, which inherently takes the delays in the control system into account. The proposed observer is experimentally evaluated using a 6.7-kW SyRM drive. The analysis and experimental results indicate that major performance improvements can be obtained with the direct discrete-time design, especially if the sampling frequency is relatively low compared to the fundamental frequency. The ratio below 10 between the sampling and fundamental frequencies is achieved in experiments with the proposed discrete-time design.

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JO - IEEE Transactions on Industry Applications

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Discrete-time observer design for sensorless synchronous motor drives

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Keywords

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