AID - Franklin Electric Europa

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Franklin Application/Installation Data Europe No. 2/2009Upon numerous requests we would like to shed light on following topics in this edition:1. – Cooling of submersible motors2. – Repair instructions for PE2/PA motors3. – Seminar overview1. When operating, just like any other electrical motor, a submersible motor produces heat.Accumulated heat generally leads to increased thermal ageing of the motor’s insulating system,mechanical wear and ultimately to thermal destruction of the motor. This is why generated heat mustbe permanently dissipated into its environment.Due to space limitations such as typically encountered in narrow boreholes and the absence ofcooling fins or aerators, submersible motors are already designed to generate as little heat aspossible.Nevertheless, most submersible motors need a defined cooling flow of water around their shell tosafely transfer the produced heat to the surroundings. Franklin Electric standard motors are designedfor a maximum water temperature of 30°C, with the required cooling flow being specified on the motornameplate as well as in the manual.To determine whether cooling requirements are met, the following parameters need attention:-motor diameter-well casing diameter-pump flow rate-pump mounting (above or below screened portion of well casing)In the majority of cases, installing the pump and motor above the well casing inlet screen alreadytakes care of the motor cooling. For more difficult cases, you may find below sketches and formulashelpful:
Cooling flow =Quantity dischargeRing spaceV =Q · 353,68(D 2 W - D 2 M )D W =Q · 353,68V+ D M2PUMPV [m/s] = cooling flow3Q [m /h] = volumetric delivery of pump at operating pointD W [mm] = inner diameter of well pipe/cooling sleeve= outer diameter of motorD M [mm]V=Example:- Flow: 50 m 3 /h- Motor: 6“ Encapsulated (D M = 0,137m)- Well diameter: 0,3m- Is the minimum cooling flow of 16 cm/sguaranted?50 m 3 /h · 353,68(300mm 2 – 137mm 2 )MOTORD MThe flow is 0,248 m/s or 24,8 cm/sThe minimum cooling flow of 16 cm/s is guaranted;in fact it’s even higher than needed!D W
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