Tesla Motor Mouths
“It’s quite interesting to people who are trying to figure out how to figure out to build an electric vehicle,” Munro says. “Because quite frankly, they’re not that easy to build and there’s a vast amount of difference between a Tesla motor—their PM [Permanent Magnet] motor is the most advanced motor we’ve seen, period--all the way to a lot of old-fashioned technology that really doesn’t do much for the driver as far as excitement is concerned.”
The BMW motor is the heaviest and most expensive, and it has the least amount of power.
“So, go figure,” says Munro. “It’s a very inefficient motor. It’s not designed for … I don’t know what it’s designed for, really.”
Telsa’s invertor/convertor—the device that takes the battery power, and supplies that power to the electric motor—is very advanced.
“It’s also inexpensive and it’s a very efficient design with the best circuitboard system I think I’ve ever seen with anybody, including other industries,” says Munro. “It comes in at about $800, whereas the BMW was $1,100 and the Chevy Bolt was about $753.”
Telsa’s the only automaker that uses silicon carbide on the integrated circuit (power supply) invertors.
“It creates a lot less heat and is a lot faster than the Chevy and BMW,” says Ellis. “Silicon carbide is the latest and greatest and Tesla so far is the only vehicle out there with it.”
Overall, Tesla’s motor is considerably smaller and more high-tech than the others.
“It looks like the other guys just went around and glued together whatever they could find off the shelf,” says Munro. “While everything on Tesla is ‘Where’d that come from? It’s very, very efficient engineering. Everywhere except for the body, which is not so good.’”