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Thermal–hydraulic performance optimization of the spiral cooling channel in surface type permanent magnet synchronous motor

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Abstract

As the operation temperature of surface type permanent magnet synchronous motor (STPMSM) is very high, it is crucial to design a reasonable and efficient motor cooling system. In this work, a grooved spiral round channel (GSRC) is designed based on the ordinary spiral round channel (OSRC) and applied to the cooling system of the STPMSM. The heat transfer coefficients and pressure losses of the OSRC and the GSRC under different conditions are compared and analyzed. It is found that compared with the OSRC, the pressure loss and heat transfer coefficient of the GSRC are reduced and increased, respectively. Furthermore, performance evaluation criterion (PEC) is used to evaluate the thermal–hydraulic performance of the two spiral cooling channels. The results demonstrate that the thermal–hydraulic performance of the GSRC is significantly superior to the OSRC. The thermal–hydraulic performance of the GSRC is better with the increase of the groove width. When the coolant, mass flow rate, spiral pitch and groove width are water, 10 g/s, 40 mm and 3 mm, respectively, the pressure loss and heat transfer coefficient of the GSRC are decreased and increased by 58.13% and 39.12%, respectively. The PEC reaches 1.27 compared to the OSRC. This work indicates that the GSRC is more appropriate for applying in the cooling system of the surface type permanent magnet synchronous motor.

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Abbreviations

A :

Wall area of spiral cooling channel (m2)

Ainlet :

Area of inlet at the spiral cooling channel (m2)

Cinlet :

Perimeter of inlet at the spiral cooling channel (m)

C p :

Specific heat capacity of coolant (J kg−1 K−1)

D c :

Equivalent diameter of spiral cooling channel inlet (m)

h w :

Heat transfer coefficient of spiral cooling channel (W m−2 k−1)

k :

Effective thermal conductivity (W m−1 k−1)

k f :

Thermal conductivity of coolant (W m−1 k−1)

L :

Total length of spiral cooling channel (m)

Δp :

Pressure loss of coolant (Pa)

p inlet :

Pressure of coolant at the inlet (Pa)

p outlet :

Pressure of coolant at the outlet (Pa)

q w :

Heat flux density at the interface between the stator and the motor casing (W m−2)

Q m :

Mass flow rate of coolant (g s−1)

T m :

Volume average temperature of coolant in spiral cooling channel (K)

T w :

Area average temperature of the spiral cooling channel wall (K)

Uinlet :

Inlet velocity of coolant (m s−1)

V :

Volume of coolant in the cooling channel (m3)

λ eq :

Equivalent thermal conductivity of the air gap (W m−1 k−1)

θ :

Temperature on the area minimum control unit(K)

μ 1 :

Dynamic viscosity of coolant (Pa s)

ρ :

Density of coolant (kg m−3)

φ :

Temperature on the volume minimum control unit (K)

f :

Friction factor

Nu :

Nusselt number

Re :

Reynolds number of coolant

Rea :

Reynolds number of the air gap

ГΦ :

Diffusion coefficient

η :

Ratio of the rotor outer diameter to the stator inner diameter

φ :

Diffusion equation

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Acknowledgements

Dr. Wei Zuo gratefully acknowledges the financial support provided by Wuhan University of Science and Technology (No. 1010010) and Wuhan Yellow Crane Talents Program. Dr. Qianju Cheng gratefully acknowledges the financial support provided by Natural Science Foundation of Hubei Province (No. 2022CFB967).

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Authors and Affiliations

  1. The State Key Laboratory of Refractories and Metallurgy, Wuhan University of Science and Technology, Wuhan, 430081, China

    Hongshuo Zhao, Wei Zuo, Qingqing Li, Ni Pan & Kun Zhou

  2. School of Mechanical and Electrical Engineering, Huanggang Normal University, Huanggang, 438000, China

    Qianju Cheng

  3. National-Provincial Joint Engineering Research Center of High Temperature Materials and Lining Technology, Wuhan University of Science and Technology, Wuhan, 430081, China

    Wei Zuo, Qingqing Li, Ni Pan & Kun Zhou

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  1. Hongshuo Zhao
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Zhao, H., Zuo, W., Li, Q. et al. Thermal–hydraulic performance optimization of the spiral cooling channel in surface type permanent magnet synchronous motor. J Therm Anal Calorim 148, 10345–10355 (2023). https://doi.org/10.1007/s10973-023-12390-z

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