Field-oriented control of saturated induction machines

Vas, P.; Alaküla, Mats

doi:10.1109/60.50834

Cited by 59 publications

(18 citation statements)

References 6 publications

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“…This strategy leads to simpler equations than those obtained with the axis D aligned on the stator flux vector or with the magnetizing flux vector (Vas, P. & Alakula, M. 1990 …”

Section: Classical Foc Lawmentioning

confidence: 99%

“…This decrease can cause a coupling between the two-phase axes D and Q, so FOC does not work properly (Kasmieh, T. & Lefevre, Y. 1998 Many published papers have studied the effects of the variation of the saturation level on FOC law (Vas, P. & Alakula, M. 1990) (Vas, P. 1981), but few attempts have been made to develop a FOC law that takes into account this variation. In this paragraph the sensitivity of the classical FOC law to the variation of saturation level of an induction motor is studied.…”

Section: Field Oriented Control Law Improvement During the Flux Weakementioning

confidence: 99%

“…Therefore, the change of the magnetic state of the motor should be taken into account in the control law. Field Oriented Control (FOC) and Direct Torque Control (DTC) are based on a linear twophase model of the induction motor (Vas, P. & Alakula, M. 1990). This model considers that the magnetic state of the motor is fixed, and all control parameters are calculated according to this state.…”

Section: Fig 1 Motor Torque According To Speed Rangementioning

confidence: 99%

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Induction Machine Vector and Direct Torque Control Improvement during the Flux Weakening Phase

Kasmieh¹

2011

Torque Control

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“…This strategy leads to simpler equations than those obtained with the axis D aligned on the stator flux vector or with the magnetizing flux vector (Vas, P. & Alakula, M. 1990 …”

Section: Classical Foc Lawmentioning

confidence: 99%

Section: Field Oriented Control Law Improvement During the Flux Weakementioning

confidence: 99%

Section: Fig 1 Motor Torque According To Speed Rangementioning

confidence: 99%

See 1 more Smart Citation

Induction Machine Vector and Direct Torque Control Improvement during the Flux Weakening Phase

Kasmieh¹

2011

Torque Control

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“…Hence, in the stator flux reference frame, (29) is written as (7) Constraining in (6) yields an expression for the electrical frequency: (8) Using this information, we rewrite the state equations in the stator flux reference frame, considering only direct stator flux and quadrature stator current dynamics:…”

Section: Torque Controlmentioning

confidence: 99%

“…Publisher Item Identifier S 0093-9994(97)05460-1. performance [1]- [8], as well as generate errors in rotor flux estimation. Our earlier work [9] and that of others [5], [10]- [12], have shown that adequate performance can be achieved with rotor-flux-based control by incorporating knowledge of the magnetic saturation into the control law.…”

mentioning

confidence: 99%

Stator-flux-based vector control of induction machines in magnetic saturation

Hofmann¹,

Sanders²,

Sullivan³

IAS '95. Conference Record of the 1995 IEEE Industry Applications Conference Thirtieth IAS Annual Meeting

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Abstract-In many variable-torque applications of induction machines, it is desirable to operate the machine at high flux levels, thus allowing the machine to produce higher torques. This can lead to saturation of the main flux path, introducing crosscoupling effects which can severely disrupt the performance of controllers dependent on knowledge of the machine's magnetic parameters. Stator-flux-oriented torque-control schemes need not depend on the magnetic parameters of the machine and, hence, are potentially more robust and easier to implement in magnetic saturation than rotor-flux-oriented control. In this paper, we present and analyze a stator-flux-oriented torque-control scheme. This controller only requires knowledge of the stator voltage, stator current, and stator resistance. An analytical expression for the maximum achievable torque output of the machine using a linear magnetics model is compared with values calculated using a nonlinear magnetics model incorporating saturation of the main flux path and is shown to be a good approximation at high flux levels, when the main flux path is heavily saturated. Experiments carried out on a 3-hp 1800-r/min wound-rotor induction machine show smooth operation of the control scheme at torque levels up to at least four times rated torque.

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Magnetic saturation in rotor‐flux‐oriented induction motor drives: operating regimes, consequences and open‐loop compensation

Levi¹

1994

Int Trans Elec Energy Syst

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Parameter variation effects infield‐oriented induction machines can cause significant performance deterioration. Magnetic saturation of the main flux path is one of the sources of parameter variations, caused by non‐linear nature of the magnetizing curve. The paper at first discusses operating regimes of a rotor‐flux‐oriented machine which lead to operation with variable main flux in the machine. These are shown to be operation with variable stator d‐axis current command during forced excitation and in field‐weakening region, and operation with variable q‐axis current command during rapid speed changes when cross‐saturation effect causes variable main flux operation. Actual effects of variable saturation level on performance of the drive are assessed by simulation. Modified rotor flux estimation schemes are then derived, which enable instantaneous open‐loop adaptation to actual saturation degree in the machine. The proposed adaptive rotor‐flux estimators are verified by simulation and some experimental results are included as well. As the saturated induction machine representation is based on the current state‐space model, while the modified rotor‐flux estimator relies on the flux state‐space model, the performed simulation study shows that current state‐space model and flux state‐space model, although considerably different in their appearance, account for the main flux saturation in basically the same way.

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Field-oriented control of saturated induction machines

Cited by 59 publications

References 6 publications

Induction Machine Vector and Direct Torque Control Improvement during the Flux Weakening Phase

Induction Machine Vector and Direct Torque Control Improvement during the Flux Weakening Phase

Stator-flux-based vector control of induction machines in magnetic saturation

Magnetic saturation in rotor‐flux‐oriented induction motor drives: operating regimes, consequences and open‐loop compensation

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