On considering magnetic saturation with maximum torque to current control in interior permanent magnet synchronous motor drives

Mademlis, Christos; Agelidis, V.G.

doi:10.1109/pesw.2002.985209

Cited by 5 publications

(7 citation statements)

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“…First, we describe the measurement of the transient inductances L dd ,t and L qq,t . In (9), the inductive voltage is represented as the product of the steady-state flux and the angular velocity. If ω = 0, from (9),…”

Section: Measurement Of Flux Characteristicsmentioning

confidence: 99%

“…Several works focusing on the magnetic flux characteristics can be found in the literature. For example, the maximal torque per ampere (MTPA) control in general vector control contributes to effective reduction of copper loss by taking into consideration magnetic saturation characteristics . As for the magnetic flux, both transient and steady‐state magnet characteristics have been investigated for interior permanent magnet synchronous motors (IPMSM) , and quantitative evaluations have been reported for motor parameters obtained from finite element method analysis and measurements .…”

Section: Introductionmentioning

confidence: 99%

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Improved PMSM model considering flux characteristics for model predictive‐based current control

Imura

Takahashi

Fujitsuna

et al. 2014

IEEJ Transactions Elec Engng

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Model predictive-based current control, which was proposed in our previous study, offers better current response performance by employing mathematical models of an inverter and a permanent magnet synchronous motor (PMSM). The performance of this kind of approach depends on the predictive model. From a more practical point of view, current behavior in the steady state should be improved. In our previous model predictive-based current control, the inverter model was refined by taking the dead-time into consideration. The use of the refined inverter model reduces the current offset in the control. However, the PMSM model was not investigated. This paper proposes a more appropriate PMSM model for model predictive-based current control in order to improve the current prediction in the steady state. For the purpose, we incorporate more detailed magnetic flux characteristics instead of average characteristics into the improved PMSM model. Specifically, in the improved PMSM model, the inductance of the PMSM is divided into transient and steady-state parts on the basis of magnetic saturation. The effectiveness of the improved model in the model predictive-based current control is demonstrated through simulations and experiments.

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Section: Measurement Of Flux Characteristicsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Improved PMSM model considering flux characteristics for model predictive‐based current control

Imura

Takahashi

Fujitsuna

et al. 2014

IEEJ Transactions Elec Engng

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“…The MTPA strategy must be modified in order to consider magnetic saturation. The relations between i q and i d which satisfy MTPA by ignoring and considering saturation are given by equations (11) and (12), respectively, (Morimoto et al , 1994; Mademlis and Agelidis, 2001): Equation 11 Equation 12 Considering equation (6), L ′ q can be written as: Equation 13 Figure 3(a) shows the MTPA trajectories by considering and ignoring saturation in the i q − i d plane. Figure 3(b)‐(c) show both the conventional and modified MTPA trajectories mapped into the T −| ψ s | plane with ignoring and considering saturation while mapping, respectively.…”

Section: Dtc Principle By Accounting For Magnetic Saturationmentioning

confidence: 99%

Modified direct torque control for saturated interior permanent magnet synchronous motors

Majidi

Milimonfared

Malekian

2010

COMPEL - The International Journal for Computation and Mathematics in Electrical and Electronic Engineering

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PurposeTo optimize the performance of direct torque‐controlled interior permanent magnet synchronous motor drives, the purpose of this paper is to modify the constraints and strategies of such a control while accounting for magnetic saturation.Design/methodology/approachThe machine model used to investigate the proposed method is the conventional two‐axis machine model, which is modified to include magnetic saturation in the quadrature axis. With the consideration of magnetic saturation, all optimal strategies, which correspond to the maximum torque per ampere and field weakening strategies, and motor‐inverter limitations are derived in T−|ψs| plane to apply in the direct torque control (DTC) method. Such strategies which take magnetic saturation into account and determine the optimal torque and flux commands are derived and implemented in DTC method.FindingsUsing the modified strategies ensures that the machine capacity is applied as much as possible. Simulation results emphasize the applicability and effectiveness of the proposed control process.Research limitations/implicationsIn order to use the proposed method, it is necessary to define quadrature‐axis inductance as a function of quadrature‐axis current. Since, in this method, a simplified function is applied, it is not required to know exact magnetic behavior of motor and this simplified function can be easily obtained using finite element softwares.Practical implicationsUsing the proposed method in practice results in better dynamic operation as well as maximal usage of the motor capacity.Originality/valueThis paper deals with consideration of magnetic saturation in DTC method which is not done in pervious works.

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“…In [18,19], an interesting, though simplified analytical approach is shown to compute the MTPA curve by mapping L d , L q and λ pm by FEA. In [20,21], the MTPA curve is analytically computed with respect to q-axis current. In [22][23][24], FEA is used to computed flux linkages on dand q-axis as a function of current.…”

Section: Introductionmentioning

confidence: 99%

Effects of the Magnetic Model of Interior Permanent Magnet Machine on MTPA, Flux Weakening and MTPV Evaluation

Bianchini

Bisceglie

Torreggiani³

et al. 2023

Machines

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Interior permanent-magnet synchronous machines are widely spreading in automotive and vehicle traction applications, because of their high efficiency over a wide speed range. This capability can be achieved by appropriated control strategies: Maximum Torque per Ampere (MTPA), Flux Weakening (FW) and Maximum Torque per Volt (MTPV). However, these control trajectories are often based on an simplified magnetic model of the electrical machine. In order to improve the evaluation of machine output capabilities, nonlinear magnetic behavior must be modeled. This is not only related to the final application with a given drive and control structure, but also during the design process of the electric machine. In the design process, the output torque Vs. speed characteristic must be calculated following MTPA, MTPV and FW in the most accurate way to avoid significant error. This paper proposes a set of algorithms to compute MTPA, FW and MTPV curves for interior permanent-magnet synchronous machines taking into account the machines’ nonlinearities caused by iron saturation and compares differed approaches to highlight the torque–speed capabilities for the same machine following different methods. The algorithms are based on the maps of the equivalent inductances of a reference interior permanent-magnet synchronous machine and inductances maps were obtained via 2-D Finite Element Analysis over the machine’s operating points in id−iq reference plane. The effects of different 2-D finite element methods are also computed by both standard nonlinear magnetostatic simulations and Frozen Permeability simulations. Results show that the nonlinear model computed via frozen permeability is more accurate than the conventional linear and nonlinear models computed via standard magnetostatic simulations; for this reason, during the electrical machine design, it is important to check the expected performance employing a complete inductance map and frozen permeability.

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On considering magnetic saturation with maximum torque to current control in interior permanent magnet synchronous motor drives

Cited by 5 publications

References 0 publications

Improved PMSM model considering flux characteristics for model predictive‐based current control

Improved PMSM model considering flux characteristics for model predictive‐based current control

Modified direct torque control for saturated interior permanent magnet synchronous motors

Effects of the Magnetic Model of Interior Permanent Magnet Machine on MTPA, Flux Weakening and MTPV Evaluation

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