Temperature effects on torque production and efficiency of PM motors using NdFeB magnets

Sebastian, Tomy

doi:10.1109/28.370284

Cited by 211 publications

(72 citation statements)

References 4 publications

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“…For example, in the linear part of the B-H curve, for temperature below about 100 °C, the remanence Br and coercive force Hc of magnets vary linearly versus temperature, which can be expressed as [30,31]:…”

Section: Influence Of Temperature On Magnetsmentioning

confidence: 99%

Steady-State Characteristics Analysis of Hybrid-Excited Flux-Switching Machines with Identical Iron Laminations

2015

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Abstract:Since the air-gap field of flux-switching permanent magnet (FSPM) machines is difficult to regulate as it is produced by the stator-magnets alone, a type of hybrid-excited flux-switching (HEFS) machine is obtained by reducing the magnet length of an original FSPM machine and introducing a set of field windings into the saved space. In this paper, the steady-state characteristics, especially for the loaded performances of four prototyped HEFS machines, namely, PM-top, PM-middle-1, PM-middle-2, and PM-bottom, are comprehensively compared and evaluated based on both 2D and 3D finite element analysis. Also, the influences of PM materials including ferrite and NdFeB, respectively, on the characteristics of HEFS machines are covered. Particularly, the impacts of magnet movement in the corresponding slot on flux-regulating performances are studied in depth. The best overall performances employing NdFeB can be obtained when magnets are located near the air-gap. The FEA predictions are validated by experimental measurements on corresponding machine prototypes.

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Section: Influence Of Temperature On Magnetsmentioning

confidence: 99%

Steady-State Characteristics Analysis of Hybrid-Excited Flux-Switching Machines with Identical Iron Laminations

2015

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“…Therefore, to design an EV/HEV-used motor, it is crucial to determine the temperature distributions and hot spot locations inside the motor, and consequently present a rational design for the cooling system in order to reduce the temperature rising and keep it in the permitted range [21]. For example, in the linear part of the B-H curve, for temperature below about 100°C, the remanence B r and coercive force H c of magnets vary linearly with temperature, which can be expressed as [22], [23]:…”

Section: Temperature-based Real Time Control Systemmentioning

confidence: 99%

Design and manufacturing considerations of flux-switching permanent magnet motors for mass productions used in EVs and HEVs

Zhang

Wang

Tong

et al. 2015

2015 18th International Conference on Electrical Machines and Systems (ICEMS)

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Published researches on flux-switching permanent magnet (FSPM) motors are focused on the analysis methods of electromagnetic performance, optimization design of lamination dimensions, combinations of stator slots and rotor poles, different kinds of field-excitations, and mechanical stability, etc. However, the manufacturing considerations for mass productions and their influences on the electromagnetic performances of FSPM motors, especially for the applications of electric vehicles (EVs) and hybrid electric vehicles (HEVs), have not been covered in previous works, which instead, are the main contributions of this paper. The complex stator structure of FSPM motors give challenges not only on mass production, but also on the cooling systems, since the permanent magnets (PMs) are surrounded by concentrated armature coils which contain the main heat source. Hence, the modular manufacturing methods are proposed and investigated. Then, a water-cooling system and the idea of an improved real time control scheme taking into account temperature variations are proposed and implemented. Moreover, inaccurate concentricity problems and unbalanced radial forces on rotor are also introduced considering the EVs/HEVs applications.

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“…In practical motor model, magnetic saturation at large stator current will cause the inductance to vary non-linearly whereas change in temperature will vary the flux linkage and resistance [17][18] [19]. For the analysis of an IPM constant parameter model without considering magnetic saturation and temperature effects will be used for simplicity but those affects will be considered through novel error compensation algorithm.…”

Section: Ipm Motor Model For Mtpa Operationmentioning

confidence: 99%

Maximum torque per ampere control for interior permanent magnet motors using DC link power measurement

Ahmed

Sözer

Hamdan³

2014

2014 IEEE Applied Power Electronics Conference and Exposition - APEC 2014

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Maximum torque per ampere (MTPA) control scheme for internal permanent magnet (IPM) machine is presented in this paper. Proposed control scheme was developed based on measurement of only DC link quantities eliminating the necessity of 3-phase current feedback. The scheme employs an online search algorithm with initial condition computed from a-priory system information. Hybridization of search based algorithm with pre-computed control coefficients ensures robustness against parameter variations while maintaining good dynamic performance.

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Temperature effects on torque production and efficiency of PM motors using NdFeB magnets

Cited by 211 publications

References 4 publications

Steady-State Characteristics Analysis of Hybrid-Excited Flux-Switching Machines with Identical Iron Laminations

Steady-State Characteristics Analysis of Hybrid-Excited Flux-Switching Machines with Identical Iron Laminations

Design and manufacturing considerations of flux-switching permanent magnet motors for mass productions used in EVs and HEVs

Maximum torque per ampere control for interior permanent magnet motors using DC link power measurement

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