### Abstract

Direct Field Orientation (DFO) is a well-established method for field-oriented control of induction motor (IM) or permanent magnet synchronous motor (PMSM) drives. In DFO, the rotor position angle is computed using the tan^{1} function of the stationary reference frame fluxes or EMFs. It is typical to estimate these quantities using an observer based on the respective motor model. The paper discusses the problem of integrating the equations of this observer: generally, pure integration cannot be implemented because of the offsets in the measured signals; integration is replaced with low pass filtering. This produces estimation errors that are significant when the drive operates at low speed; the errors propagate in the rotor position. The paper discusses an interesting property of Sliding Mode Observers: under the same offset conditions, because of the discontinuous feedback used, SM Observers allow ideal integration of the observer equations. Thus, low pass filtering is avoided, the estimates have no phase errors and the resulting rotor position is more accurate than in observers with continuous feedback. The paper analyzes the general case and studies the PMSM as an example. The theoretical claims are validated with simulations and experimental tests.

Original language | English (US) |
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Title of host publication | 2011 IEEE International Electric Machines and Drives Conference, IEMDC 2011 |

Pages | 1082-1087 |

Number of pages | 6 |

DOIs | |

State | Published - Sep 14 2011 |

Event | 2011 IEEE International Electric Machines and Drives Conference, IEMDC 2011 - Niagara Falls, ON, Canada Duration: May 15 2011 → May 18 2011 |

### Publication series

Name | 2011 IEEE International Electric Machines and Drives Conference, IEMDC 2011 |
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### Other

Other | 2011 IEEE International Electric Machines and Drives Conference, IEMDC 2011 |
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Country | Canada |

City | Niagara Falls, ON |

Period | 5/15/11 → 5/18/11 |

### Fingerprint

### All Science Journal Classification (ASJC) codes

- Electrical and Electronic Engineering

### Cite this

*2011 IEEE International Electric Machines and Drives Conference, IEMDC 2011*(pp. 1082-1087). [5994752] (2011 IEEE International Electric Machines and Drives Conference, IEMDC 2011). https://doi.org/10.1109/IEMDC.2011.5994752

}

*2011 IEEE International Electric Machines and Drives Conference, IEMDC 2011.*, 5994752, 2011 IEEE International Electric Machines and Drives Conference, IEMDC 2011, pp. 1082-1087, 2011 IEEE International Electric Machines and Drives Conference, IEMDC 2011, Niagara Falls, ON, Canada, 5/15/11. https://doi.org/10.1109/IEMDC.2011.5994752

**Ideal integration of observers with sinusoidal states by Sliding Mode - Application to Direct Field Orientation of motor drives.** / Comanescu, Mihai.

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution

TY - GEN

T1 - Ideal integration of observers with sinusoidal states by Sliding Mode - Application to Direct Field Orientation of motor drives

AU - Comanescu, Mihai

PY - 2011/9/14

Y1 - 2011/9/14

N2 - Direct Field Orientation (DFO) is a well-established method for field-oriented control of induction motor (IM) or permanent magnet synchronous motor (PMSM) drives. In DFO, the rotor position angle is computed using the tan1 function of the stationary reference frame fluxes or EMFs. It is typical to estimate these quantities using an observer based on the respective motor model. The paper discusses the problem of integrating the equations of this observer: generally, pure integration cannot be implemented because of the offsets in the measured signals; integration is replaced with low pass filtering. This produces estimation errors that are significant when the drive operates at low speed; the errors propagate in the rotor position. The paper discusses an interesting property of Sliding Mode Observers: under the same offset conditions, because of the discontinuous feedback used, SM Observers allow ideal integration of the observer equations. Thus, low pass filtering is avoided, the estimates have no phase errors and the resulting rotor position is more accurate than in observers with continuous feedback. The paper analyzes the general case and studies the PMSM as an example. The theoretical claims are validated with simulations and experimental tests.

AB - Direct Field Orientation (DFO) is a well-established method for field-oriented control of induction motor (IM) or permanent magnet synchronous motor (PMSM) drives. In DFO, the rotor position angle is computed using the tan1 function of the stationary reference frame fluxes or EMFs. It is typical to estimate these quantities using an observer based on the respective motor model. The paper discusses the problem of integrating the equations of this observer: generally, pure integration cannot be implemented because of the offsets in the measured signals; integration is replaced with low pass filtering. This produces estimation errors that are significant when the drive operates at low speed; the errors propagate in the rotor position. The paper discusses an interesting property of Sliding Mode Observers: under the same offset conditions, because of the discontinuous feedback used, SM Observers allow ideal integration of the observer equations. Thus, low pass filtering is avoided, the estimates have no phase errors and the resulting rotor position is more accurate than in observers with continuous feedback. The paper analyzes the general case and studies the PMSM as an example. The theoretical claims are validated with simulations and experimental tests.

UR - http://www.scopus.com/inward/record.url?scp=80052585802&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=80052585802&partnerID=8YFLogxK

U2 - 10.1109/IEMDC.2011.5994752

DO - 10.1109/IEMDC.2011.5994752

M3 - Conference contribution

AN - SCOPUS:80052585802

SN - 9781457700613

T3 - 2011 IEEE International Electric Machines and Drives Conference, IEMDC 2011

SP - 1082

EP - 1087

BT - 2011 IEEE International Electric Machines and Drives Conference, IEMDC 2011

ER -