Wafter design for totally enclosed electric machines

Satrústegui, Marco; Artetxe, Gurutz; Elósegui, Ibon; Martínez-Iturralde, M.; Ramos, Juan Carlos

doi:10.1016/j.applthermaleng.2017.10.011

Cited by 9 publications

(7 citation statements)

References 28 publications

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“…4. In this regard, wafters have been designed following design criteria from [55]. (iii) IC71W + fan: Water‐jacket plus a fan and an air circulation system in order to provide for additional cooling, as shown in Fig.…”

Section: Thermal Analysismentioning

confidence: 99%

Multidisciplinary analysis of a 750 kW PMSM for marine propulsion including shock loading response

Prieto

Satrústegui

Elósegui

et al. 2020

IET Electric Power Applications

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This study presents the electromagnetic, thermal and mechanical analysis of a 750 kW, 1200 rpm, 690 V surface permanent magnet motor aimed at marine propulsion (azimuth thruster). Based on a preliminary machine design, key electromagnetic design aspects including magnet demagnetisation and magnet loss reduction by tangential and axial segmentation are assessed. Then, three different cooling solutions are evaluated via computational fluid dynamics simulations combining the use of a water‐jacket surrounding the stator, wafters attached to the rotor structure and the addition of an inner fan. Subsequently, the dynamic design analysis method is applied in order to check the machine's response to shock loadings due to underwater explosions. Finally, a machine prototype is successfully manufactured and tested, showing the proper fulfilment of the design requirements.

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Section: Thermal Analysismentioning

confidence: 99%

Multidisciplinary analysis of a 750 kW PMSM for marine propulsion including shock loading response

Prieto

Satrústegui

Elósegui

et al. 2020

IET Electric Power Applications

Self Cite

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“…The wafter is installed on the rotor so that when the rotor rotates, the wafter also rotates, causing the forced airflow at the end region to increase, thus helping the electric motor cooling process. Satrustegui et al [28] apply a wafter to electric motors with internal rotor type and wafter installed on the rotor. However, the type of electric motor used is an induction motor.…”

Section: Introductionmentioning

confidence: 99%

Modification of the In-Wheel Motor Housing and Its Effect on Temperature Reduction

Albana,

Guntur,

Putra

2024

WEVJ

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This research proposes a novel cooling system to minimize the external rotor type of electric motor temperature by installing fan blades (wafters) on the inner housing of the electric motor. Fan blades (wafters) are made by printing using 3D printer technology and using polylactic acid (PLA) as the material. Wafters are then installed on an in-wheel motor with a power of 1500 W, having 48 poles and 52 slots. The study included thermal simulation and experimental techniques to ascertain how fan blades (wafters) affected the electric motor’s thermal properties. The motor rotated at 500 rpm during the experimental test with no load condition. The temperature of the electric motor is known using an infrared thermal imager. Using Ansys Motor-CAD 15.1 software, thermal modeling employs the lumped circuit model approach. Thermal simulation results show almost the same results as the experimental test results. Applying wafters on the in-wheel motor housing significantly reduces the winding temperature by 3.047 °C or experiences a temperature reduction of 4.34%. Using wafters in the in-wheel motor housing also speeds up the stable state temperature of the electric motor by 9 min compared to in-wheel motors without wafters.

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“…High performance electric motors may employ specific cooling methods for the end-windings [21], [22]. For the case of industrial induction machines, fins attached to the rotor short-circuit rings (usually known as wafters) have been traditionally employed in totally enclosed designs to boost the airflow within the end-space region [13], [14]. This reduces the risk of irreversible damage of the insulation of the copper, but this is at the expense of increasing the windage losses.…”

Section: Introductionmentioning

confidence: 99%

“…Several authors have addressed characterization of the heattransfer within the end-space region. Methods reported in [13]- [16] are based on numerical approaches being therefore beyond the scope of this paper. Earlier, Schubert [23] proposed an empirical correlation for the convection heat-transfer coefficient in totally enclosed motors as a function of the inner air velocity v (1), where k 1 accounts for the natural convection and radiation of the end-windings when the motor is at standstill, and k 2 and k 3 account for the impact airflow due to the rotation of the machine in the end-space region.…”

Section: Introductionmentioning

confidence: 99%

Modeling of End-Space Convection Heat-Transfer for Internal and External Rotor PMSMs With Fractional-Slot Concentrated Windings

Tovar-Barranco

López-de-Heredia

Villar

et al. 2021

IEEE Trans. Ind. Electron.

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Modeling of convection heat-transfer at the end-windings for thermal networks using lumpedparameters has been widely discussed in the literature. Unfortunately, the resulting coefficients are highly influenced by the end-winding shape, the area in the vicinity of the end-windings, the cooling method of this region (if any), as well by the size and power of the machine. This makes extremely difficult for the designer to choose a suitable coefficient for the thermal analysis during the design stage of an electric motor. A methodology to obtain the end-windings convection heat-transfer coefficients for fractional-slot concentrated winding permanent-magnet synchronous motors is proposed in this paper. Machine designs with both internal and external rotors will be considered. The experimental tests required for the model characterization are described in detail. General expressions of the convection heat-transfer coefficients between the end-windings and the housing end-caps are proposed for both internal and external rotor designs. Differences observed with results reported in the literature are also discussed.

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Wafter design for totally enclosed electric machines

Cited by 9 publications

References 28 publications

Multidisciplinary analysis of a 750 kW PMSM for marine propulsion including shock loading response

Multidisciplinary analysis of a 750 kW PMSM for marine propulsion including shock loading response

Modification of the In-Wheel Motor Housing and Its Effect on Temperature Reduction

Modeling of End-Space Convection Heat-Transfer for Internal and External Rotor PMSMs With Fractional-Slot Concentrated Windings

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