home *** CD-ROM | disk | FTP | other *** search
- Xref: sparky sci.electronics:21066 sci.energy:6233 rec.autos.tech:16861
- Path: sparky!uunet!zaphod.mps.ohio-state.edu!usc!hela.iti.org!cs.widener.edu!dsinc!netnews.upenn.edu!eniac.seas.upenn.edu!jhaines
- From: jhaines@eniac.seas.upenn.edu (Jason Haines)
- Newsgroups: sci.electronics,sci.energy,rec.autos.tech
- Subject: Re: Flywheel batteries as EV power source
- Message-ID: <102559@netnews.upenn.edu>
- Date: 18 Dec 92 03:20:37 GMT
- References: <1992Dec16.192456.6261@news.cs.brandeis.edu> <1992Dec17.011649.987@cmkrnl.com> <1992Dec18.012654.26238@ra.oc.com>
- Sender: news@netnews.upenn.edu
- Followup-To: sci.electronics
- Organization: University of Pennsylvania
- Lines: 37
- Nntp-Posting-Host: eniac.seas.upenn.edu
-
- In article <1992Dec18.012654.26238@ra.oc.com> rodder@ccwf.cc.utexas.edu (Jon D. Rodder) writes:
- >In article <1992Dec17.011649.987@cmkrnl.com> jeh@cmkrnl.com writes:
- >>
- >>Then we come to electric motors to drive the wheels. Electric motors have
- >>wonderful torque/speed characteristics for vehicles (they generate maximum
- >>torque just before stall speed, which may make transmissions and clutches
- >>unnecessary) but lousy power density -- look at the size of a 1-hp. electric
- >>motor sometime and tell me how big a motor would have to be to accelerate a
- >>car fast enough to keep up with gasoline-powered ones.
- >>
- >>Internet: jeh@cmkrnl.com, hanrahan@eisner.decus.org, or jeh@crash.cts.com
- >
- >Well, lets see.. the 20hp permanent magnet motor in our solar powered car
- >is about 6 inches in diameter and 6 inches long. It weighs under 20lbs.
- >See the GM Impact for a production style example of a compact high power
- >motor.
- I was waiting for someone to reply to this comment (I lost the
- original message). The 20hp DC brushless motor in our solar
- car is also about 6" in diameter and less than 6" (not counting the cooling
- fan and wiring set-up attached to the side) long. I haven't weighed the
- motor recently so this is from memory but I thinkj it weighs about
- 30 lbs. Sounds pretty compact to me - plus it delivers virtually all
- of its torque at 0 rpm and continues to have virtually constant
- torque charactericts for a much broader range than any IC engine.
-
- >-=< Jon Lusky ----- rodder@ccwf.cc.utexas.edu >=--
-
-
- ------------------------------------------------------------------------
- Jason R. Haines University of Pennsylvania (SEAS & Wharton)
- ------------------------------------------------------------------------
- Red '90 Mustang LX 5.0 / Blue '71 Rotary Powered Datsun 510
- (Recycle your toner cartridges) (^^^^^FOR SALE^^^^^)
- ------------------------------------------------------------------------
-
-
-
-