### Abstract

The paper presents an estimator for the inverse of the rotor time constant of the induction motor. Estimation is done using a sliding mode observer under the assumption that the stationary frame fluxes are known. With measured voltages, currents, and with known fluxes and speed, the paper develops an MRAS-type sliding mode observer. This works well under ideal conditions; however, if the speed is inaccurate or if the magnetising inductance saturates, the accuracy suffers. The paper develops a model for the saturated induction motor and attempts to also estimate the saturation level. In the second part, an observer with only a single set of feedback terms is developed. This is transformed into a sensorless observer by feeding it with a speed estimate (assumed inaccurate). The error in the estimated rotor time constant can be reduced by operating the motor drive with a low ratio of i_{d} to i_{q}.

Original language | English (US) |
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Pages (from-to) | 52-78 |

Number of pages | 27 |

Journal | International Journal of Power Electronics |

Volume | 9 |

Issue number | 1 |

State | Published - Jan 1 2018 |

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### All Science Journal Classification (ASJC) codes

- Electrical and Electronic Engineering

### Cite this

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**Design and implementation of a MRAS sliding mode observer for the inverse of the rotor time constant of the induction motor.** / Comanescu, Mihai.

Research output: Contribution to journal › Article

TY - JOUR

T1 - Design and implementation of a MRAS sliding mode observer for the inverse of the rotor time constant of the induction motor

AU - Comanescu, Mihai

PY - 2018/1/1

Y1 - 2018/1/1

N2 - The paper presents an estimator for the inverse of the rotor time constant of the induction motor. Estimation is done using a sliding mode observer under the assumption that the stationary frame fluxes are known. With measured voltages, currents, and with known fluxes and speed, the paper develops an MRAS-type sliding mode observer. This works well under ideal conditions; however, if the speed is inaccurate or if the magnetising inductance saturates, the accuracy suffers. The paper develops a model for the saturated induction motor and attempts to also estimate the saturation level. In the second part, an observer with only a single set of feedback terms is developed. This is transformed into a sensorless observer by feeding it with a speed estimate (assumed inaccurate). The error in the estimated rotor time constant can be reduced by operating the motor drive with a low ratio of id to iq.

AB - The paper presents an estimator for the inverse of the rotor time constant of the induction motor. Estimation is done using a sliding mode observer under the assumption that the stationary frame fluxes are known. With measured voltages, currents, and with known fluxes and speed, the paper develops an MRAS-type sliding mode observer. This works well under ideal conditions; however, if the speed is inaccurate or if the magnetising inductance saturates, the accuracy suffers. The paper develops a model for the saturated induction motor and attempts to also estimate the saturation level. In the second part, an observer with only a single set of feedback terms is developed. This is transformed into a sensorless observer by feeding it with a speed estimate (assumed inaccurate). The error in the estimated rotor time constant can be reduced by operating the motor drive with a low ratio of id to iq.

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UR - http://www.scopus.com/inward/citedby.url?scp=85037813893&partnerID=8YFLogxK

M3 - Article

AN - SCOPUS:85037813893

VL - 9

SP - 52

EP - 78

JO - International Journal of Power Electronics

JF - International Journal of Power Electronics

SN - 1756-638X

IS - 1

ER -