XPost: sci.space.policy, sci.physics, sci.electronics.design   
   From: tauno.voipio@notused.fi.invalid   
      
   On 10.7.17 07:15, Greg Goss wrote:   
   > "Robert Clark"  wrote:   
   >   
   >> I was estimating that size of the engine based on cited high horsepower for   
   >> the Tesla cars. But I was surprised the mass and volume required for the   
   >> Tesla electric motor is much smaller than a comparable gasoline engine. This   
   >> video makes a comparison of a Tesla electric motor to a typical gas engine.   
   >> The power to weight ratio is 10 times better for the Tesla electric motor(!)   
   >>   
   >   
   > I haven't been following the Tesla and similar modern electric cars.   
   > I seem to recall that twenty years ago, they were predicting that the   
   > big advantage of electric cars would be motors IN the wheels and no   
   > transmission at all.  Did anyone ever go that route?   
      
   The problem with the motors in the wheels is that it is going to   
   be a bumpy ride becaus of the large mass outside of spring suspension.   
      
   > (My Ford hybrid has two electric motors and the gas engine.  I am   
   > having trouble finding a good overview of the transmission, but it   
   > seems to be based on a differential concept.)   
      
   So has my Lexus. It is similar to the Toyota Prius scheme,   
   which is pretty well described in the Net.   
      
   However, Ford may have patent problems with Toyota, or they   
   may hava a licensing agreement.   
      
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