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Tesla Motors electric motor vs. YASA electric motor and what is important for e-vehicle

Tesla Motors electric motor vs. YASA electric motor and what is important for e-vehicle

Hi Guys,
After review of several videos and electronic vehicles, I have some questions and may be you can help me with them.
For a long time I was thinking that Tesla produce the best electric motors for e-vehicles (AC Induction). Recently I found YASA motors (http://www.yasamotors.com/) with incredible axial-flux motors. Below is a table that I created to compare Tesla motor vs. YASA motor:

https://www.photobox.co.uk/my/photo/full?photo_id=9034110929

These numbers have raised important questions to me:
1) Is peak power density is the most important factor for EV electric motor?
2) I think that we should look at Peak Torque and Peak Power combination of factors. I mean the best electric motor is a motor with low Peak Power, which means low energy consumption, and high Peak Torque, which means strong driving characteristics.
3) As I understand, Voltage is also important because if we apply high voltage we will get higher Peak Power and as a result higher Peak Torque. The main problem is that high voltage controllers/invertors cost much more then low voltage (for example 350 VCD vs. 700 VCD).

So I will be glad if someone can validate my findings and comment factor is the most important to consider on electric motors for EV.

Thank you

TeslaTap.com | 14 gennaio 2016

Your photobox link doesn't work. The Yasa Motors (Yasa) site is rather weak on details. Not clear if the Yasa motor uses rare-earth magnets or not. Tesla does not which is advantage over most other EVs from a supply standpoint.

Tesla makes their own motors using robotic machines. We really have no idea what the cost is for Tesla to make them, so it's hard to say if it is lower cost that the Yasa Motors products. Tesla likes to keep as much of the design and manufacturing in-house to avoid supplier problems and retain total control of critical components.

As for what makes the 'best' motor. there are many factors, including longevity, noise, vibration, power efficiency, ability to offer regenerative braking, cost of power control electronics, smoothness, weight, size, liquid cooling requirements, torque and maximum RPM. It's the right combination of these factors that makes for the best motor for a specific EV application.

I think it's way beyond anyone here to answer your question, given we don't know many of these factors for Yasa motors or Tesla's motors.

David N | 14 gennaio 2016

Your question should be sent to an EV manufacturer, not to a public forum whose members have very limited knowledge of what's the best motor for an EV.

nechaev.av | 14 gennaio 2016

TeslaTap.com thank you for comments; pls check the link below it contains some data on both Tesla and Yasa.

http://imageshack.com/a/img905/9887/7rME1I.jpg

Yasa produce axial flux electric motors and use in its production permanent magnets so we can concluded that they use rare-earth magnets but we do not know how much they use. Also from wiki (https://en.wikipedia.org/wiki/YASA_Motors) we see that their motors are successfully used in Dakar race - Drive eO, and some other EV. According to performance data these motors are better that even Tesla electric motor – high torque vs. low power. My questions is just to ask independent opinion is it right to follow my logic or it have some flows?

EcLectric | 15 gennaio 2016

What problem are you trying to solve?

The Tesla motor is the size of a watermelon, doesn't use rare-earth elements and powers my car with as much torque as the tires can handle. It takes about 5 seconds to get to a speed that is illegal everywhere in the civilized world except for the Autobahn.

Why don't you solve a real problem? For me, its the fact that I have to press the button every day to open my garage door... Oh, hang on! They fixed that yesterday!

Ok, then let me browse music on my iPhone...

Timo | 19 gennaio 2016

Model S "motor" is motor + cooling + reduction gear in the imageshack link. The pure motor inside that is tiny.

george | 16 luglio 2019

I designed a motor 5 years ago without any permanent magnets that outputs 1.9 kN of torque at 300A, the dimensions t are the same as YASA motor's, the weight is less,

https://ibb.co/mHz3qbJ