I would puncuate a bit differently if I were writing it: ". . . with Kia's Gamma 1.6-litre gasoline engine, mated to a 15 kW, 105 Nm, AC-synchronized electric motor, a CVT transmission, and the new ISG (Idle Stop & Go) system." The "AC" goes with "synchronized." Remember a journalist wrote it (actually it is a straight lift from the company's press release, but they use journalists too). To control the electric motor in a hybrid, almost all companies design a variable frequncy ac power converter to drive a permanent magnet motor. The 105 Nm is a torque. 105 N·m would be better usage. NIST SP330 and SP811 require the use of a space or half-high dot (dot on the line is NOT permitted). However, NIST SP811 (section 6.1.5)points out that ISO 31-0 permits the space or half dot to be omitted if it does not cause confusion. It is VERY commonly omitted in torque (Nm) and electrical energy (kWh). I can't think of too many other examples where it isn't confusing (could be mistaken for something else). Given the kph figures, and the 19 inch wheels, the company is not overly concerned with perfect SI usage. (I have never found the article with table; a link would be helpful. The article I did find would seem to indicate some confusion between attributes of the concept vehicle and another vehicle which is being offered as a limited volume prototype fleet.)
--- On Sat, 3/7/09, Bill Hooper <hooperb...@bellsouth.net> wrote: From: Bill Hooper <hooperb...@bellsouth.net> Subject: [USMA:43448] Re: SI in Auto reports To: "U.S. Metric Association" <usma@colostate.edu> Date: Saturday, March 7, 2009, 3:08 PM I am still confused and befuddled! On Mar 6 , at 2:22 PM, John M. Steele wrote: I'm not sure it is the same article (no table in it) but the same newspaper, and concept car: http://www.washingtontimes.com/news/2009/mar/06/new-kia-no-3-concept-car-stars-at-geneva-show/ The 15 kW 105 Nm rating is the supplemental electrical motor as explained in the article. The output of the gasoline engine is not revealed. The article referenced above states: "The cee'd Hybrid being shown in Geneva uses an upgraded powertrain with Kia's Gamma 1.6-litre gasoline engine, mated to a 15 kW, 105 Nm AC synchronized electric motor, a CVT transmission and the new ISG (Idle Stop & Go) system." I still am interested in learning what the meaning is of the term "105 Nm AC". I am sure that the "15 kW" is the power of the electric engine but the "105 Nm AC" does not seem to make sense. The symbol "Nm" is not the proper symbol for ANYTHING in SI metric. The best one can infer (assuming it is intended to be an SI unit at all) is that it was intended to mean "newton-metres", the proper symbol for which is written either as " N m" or "N.m" or (preferably) "N·m". However, that unit (newton-metres) can be used as a unit of torque or a unit of energy (or work). Which is it? If it is a torque, it makes sense as the torque applied by the electric motor to turn the drive shaft and/or wheels of the vehicle. But then, what does AC mean? Air conditioning? Alternating Current? How would torque be relevant to air conditioning or alternating current? If the newton-metres are supposed to be energy, then it makes little sense at all. (The energy produced by an engine can be anything at all, depending on how long one lets the engine run.) Furthermore, the seemingly inapplicable terms "air conditioning" and "alternating current" are just as confusing for energy as they are for torque. Can anyone clarify this for me? Regards, Bill Hooper Fernandina Beach, Florida, USA ========================== SImplification Begins With SI. ==========================
