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Flux-Weakening Control

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Practical Control of Electric Machines for EV/HEVs

Part of the book series: Lecture Notes in Electrical Engineering ((LNEE,volume 1064))

Abstract

Flux-weakening is essential for high speed electric machine control. Various flux-weakening approaches are analyzed and discussed in this chapter. Also, the I-limit, V-limit, Q-limit, \(\varPsi \)-limit, and T-limit are introduced. These limits play a critical part in the flux-weakening strategy design.

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Notes

  1. 1.

    \(I_d^{{\text{ lim }}}\) is the same as \(I_d^{{\text{ dmd }}}\) for fast torque control strategy.

  2. 2.

    \(\omega _1>\omega _b\). \(\omega _b\) is the base speed as defined in Sect. 3.9.

  3. 3.

    Q-limit in this case is not a limiting factor.

  4. 4.

    Nevertheless, the design of an intelligent and delicate integral term for limit control is still possible, but it is not within the scope of this book.

  5. 5.

    \(L_m^2 = L_{SS} L_{RR}\approx L_s L_r\).

  6. 6.

    Flux saturation will be explicitly controlled at Sect. 7.5.

  7. 7.

    Flux-weakening specified as in Sect. 7.2 (covering both Type1 and Type2) shall be used when \(I_{max}<I_{max}^{{\text{ iC }}}\), and Sect. 7.3 (Type1 only) when \(I_{max}>I_{max}^{{\text{ qC }}}\).

  8. 8.

    The flux weakening is along the MTPF line when \(I_{max}\ge I_{max}^{{\text{ pC }}}\). By contrast, the system shall operate along \(i_{sq}=\text {cnst}\) to perform flux-weakening firstly, and then along the MTPF line once \(\omega _s>\omega _c\).

References

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Author information

Authors and Affiliations

  1. Hozon New Energy Automobile Company Limited, Shanghai, China

    Shuiwen Shen

  2. GKN Aerospace Services Limited, Global Technology Centres, Bristol, UK

    Qiong-zhong Chen

Authors
  1. Shuiwen Shen
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  2. Qiong-zhong Chen
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Correspondence to Shuiwen Shen .

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Shen, S., Chen, Qz. (2024). Flux-Weakening Control. In: Practical Control of Electric Machines for EV/HEVs . Lecture Notes in Electrical Engineering, vol 1064. Springer, Cham. https://doi.org/10.1007/978-3-031-38161-4_7

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  • DOI: https://doi.org/10.1007/978-3-031-38161-4_7

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  • Publisher Name: Springer, Cham

  • Print ISBN: 978-3-031-38160-7

  • Online ISBN: 978-3-031-38161-4

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