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Tesla Motors electric motor vs. YASA electric motor and what is important for EV

Discussion in 'Tesla' started by nech12, Jan 14, 2016.

  1. nech12

    nech12 New Member

    Joined:
    Jan 13, 2016
    Messages:
    2
    Location:
    USA
    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:

    Company / MotorMotor Weight
    (kg)
    Peak Power
    (kW)
    Continuous Power
    (kW)
    Peak Torque
    (Nm)
    Continuous Torque
    (Nm)
    Voltage
    (V)
    Max. speed
    (rpm)
    Nominal speed
    (rpm)
    Efficiency
    (%)
    Peak power density
    (kW/kg)
    Tesla









    2015 Tesla Model SP68 375 n/a600 n/a320 15 300 0-5100
    5.5
    2015 Tesla Model S8568 285 n/a440 n/a320 14 800 0-5800
    4.2
    2012 Tesla Model S6050 225 n/a430 n/a320 14 200 0-5000
    4.5
    2007 Tesla Roadster32 225 n/a370 n/a240 14 000 0-5400
    7.0
    2007 Tesla Roadster Sport32 223 n/a400 n/a240 14 000 0-5100
    7.0











    YASA Motors









    Custom Motorn/a800 400 4 000 1 000




    YASA-75033 100/20090 790 400 350/7003 250 0-2500>95%6.0
    YASA-P400 Series24 160 100 390 300 700 7 500 0-480096%7.4
    YASA-40024 90/16550/70360 250 350/7007 500 0-4500>95%7.5
    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
     

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