Probably the same as liquid vs air-cooled ICE, if the motor is not liquid cooled (as apparently the Solectria induction motors were) then adequate amount of air needs to be available to cool the motor directly. In fact, liquid cooling is just "concentrated air cooling at a distance" since every liquid cooling takes its cooling effect from a radiator and air flow, so it is just expanding the surface area off-site from where the heat is created and (often) also allow a means to control the temperature of the cooled part (thermostat, fan switch). On a direct (air) cooled part, the surface needs to be large enough, the air flow big enough and the temp difference large enough to transfer the heat from the cooled part. If air flow is not sufficient or the incoming air too hot to allow sufficient cooling then it can help to increase the surface area (fins) on the cooled part, but loss of air flow can seriously cause the cooled part to overheat, even with fins (just like loss of coolant or pump can cause serious overheating)
Cor van de Water Chief Scientist Proxim Wireless office +1 408 383 7626 Skype: cor_van_de_water XoIP +31 87 784 1130 private: cvandewater.info http://www.proxim.com This email message (including any attachments) contains confidential and proprietary information of Proxim Wireless Corporation. If you received this message in error, please delete it and notify the sender. Any unauthorized use, disclosure, distribution, or copying of any part of this message is prohibited. -----Original Message----- From: EV [mailto:[email protected]] On Behalf Of EVDL Administrator via EV Sent: Thursday, January 14, 2016 10:19 AM To: Electric Vehicle Discussion List Subject: Re: [EVDL] Leaf donor car? Re: Books on converting a car to ev? On 14 Jan 2016 at 6:34, dovepa via EV wrote: > You left out the fact that series motors get too hot when operated at highway > speed for extended periods of time. Can you explain what would cause this? Not being an engineer, I don't understand why a series motor producing a given amount of power would produce more heat than a shunt, sepex, or induction motor. Is it that the efficiency is lower? The Prestolite and ADC series motors had/have built in fans, but a fair number of builders add more cooling. Typically it's a nice beefy bilge blower firing into a collar attached to the brush access ports. That's another source of noise. :-( Come to that, though, Solectria's 1990s-era induction motors had big fins on the outside, and they had to have a big axial fan forcing air over those fins. Without the fan, they'd overheat on the highway. Those were supposedly pretty efficient motors, too, and not really all that powerful. David Roden - Akron, Ohio, USA EVDL Administrator = = = = = = = = = = = = = = = = = = = = = = = = = = = = = EVDL Information: http://www.evdl.org/help/ = = = = = = = = = = = = = = = = = = = = = = = = = = = = = Note: mail sent to "evpost" and "etpost" addresses will not reach me. To send a private message, please obtain my email address from the webpage http://www.evdl.org/help/ . = = = = = = = = = = = = = = = = = = = = = = = = = = = = = _______________________________________________ UNSUBSCRIBE: http://www.evdl.org/help/index.html#usub http://lists.evdl.org/listinfo.cgi/ev-evdl.org Read EVAngel's EV News at http://evdl.org/evln/ Please discuss EV drag racing at NEDRA (http://groups.yahoo.com/group/NEDRA) _______________________________________________ UNSUBSCRIBE: http://www.evdl.org/help/index.html#usub http://lists.evdl.org/listinfo.cgi/ev-evdl.org Read EVAngel's EV News at http://evdl.org/evln/ Please discuss EV drag racing at NEDRA (http://groups.yahoo.com/group/NEDRA)
