Featured Nissan motor analysis Munro

Discussion in 'Prius, Hybrid, EV and Alt-Fuel News' started by bwilson4web, Aug 1, 2025 at 9:32 PM.

  1. bwilson4web

    bwilson4web BMW i3 and Model 3

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    Nissan is producing a motor using an electro-magnet rotor which eliminates the need for permanent magnets:


    The same as running an alternator as a motor, this is a brilliant solution as it also solves the problem of back-EMF that requires 'field weakening' in traditional motors. There is no free lunch as the rotor coils require power but the dynamic range of efficient power production is well worth it.

    Bob Wilson
     
    #1 bwilson4web, Aug 1, 2025 at 9:32 PM
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  2. bisco

    bisco cookie crumbler

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    does it reduce rare element usage?
     
    #2 bisco, Aug 2, 2025 at 2:39 PM
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  3. bwilson4web

    bwilson4web BMW i3 and Model 3

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    Yes. By orders of magnitude.

    Bob Wilson
     
    #3 bwilson4web, Aug 2, 2025 at 5:57 PM
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  4. bisco

    bisco cookie crumbler

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    i wonder if they are expensive motors to build. ariya is not an inexpensive car, for what you get
     
    #4 bisco, Aug 2, 2025 at 8:58 PM
  5. T1 Terry

    T1 Terry Active Member

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    I like the rational they used, reduce the supply chain issues and make highway driving energy efficient by not needing to waste battery capacity using field weakening. As said in the video, no one really cares about town energy consumption, plenty of recharge facilities in the city, not so much out on the freeways.

    T1 Terry
     
    #5 T1 Terry, Aug 2, 2025 at 9:09 PM
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  6. bwilson4web

    bwilson4web BMW i3 and Model 3

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    It should be slightly more than an induction but significantly less expensive than a PM.

    The carbon slip rings are a wear item but having a pair of brushes for each should help. Efficiency TBD but should be on par with a quality induction motor.

    Munro makes money selling their tear-down reports. Perhaps call them Monday?

    Bob Wilson
     
    #6 bwilson4web, Aug 3, 2025 at 6:48 PM
  7. Isaac Zachary

    Isaac Zachary Senior Member

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    I'm not sure what field weekening is, but Tesla and Toyota both use a type of motor that changes from PM (low end torque) to reluctance (high end power) by changing the phase angle in relation to the rotor.
     
    #7 Isaac Zachary, Aug 3, 2025 at 8:55 PM
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  8. Gokhan

    Gokhan Senior Member

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    So, then, it will require replacement every three years/30,000 miles like alternators. It sounds like typical Nissan reliability. LOL
     
    #8 Gokhan, Aug 4, 2025 at 7:36 AM
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  9. bwilson4web

    bwilson4web BMW i3 and Model 3

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    As long as they easily replaced, like tires and wipers, a nit.

    Bob Wilson
     
    #9 bwilson4web, Aug 4, 2025 at 1:12 PM
  10. bisco

    bisco cookie crumbler

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    and not like the cabin filter on an id buzz
     
    #10 bisco, Aug 4, 2025 at 2:08 PM
  11. Isaac Zachary

    Isaac Zachary Senior Member

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    Or like a timing belt on a Chevy Trax.
     
    #11 Isaac Zachary, Aug 4, 2025 at 2:24 PM
  12. bwilson4web

    bwilson4web BMW i3 and Model 3

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    Curious, I've only had one alternator failure due to a bad bearing from a poorly adjusted belt. All the other worked much longer than the old style, brushed, generators. One of those failed in my Cherokee 140 about 4-5 hours from home ... got to do a lot of dead reckoning that night.

    Bob Wilson
     
    #12 bwilson4web, Aug 4, 2025 at 10:42 PM
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  13. T1 Terry

    T1 Terry Active Member

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    The dual brushes are carrying very little current so the should last a reasonable time, and the cover comes off easy enough to replace the whole assembly ..... I can't see that being serious issue.

    I think it will a few yrs before we see very many of these turning up at salvage auctions, so I won't hold out waiting to get one to put in my VW Kombi.

    T1 Terry
     
    #13 T1 Terry, Aug 4, 2025 at 11:36 PM
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  14. Gokhan

    Gokhan Senior Member

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    A neighbor had a Nissan Maxima. The alternator and starter would fail every other year (like everything else in the car such as the transmission, electrical systems, etc.). He never paid for them because the auto parts stores had warranties for alternators and starters; so, he would just return the old one and get a new one. Eventually, the car became undrivable due to transmission issues, and he got rid of it.

    That's why we buy Toyotas here. LOL
     
    #14 Gokhan, Aug 5, 2025 at 7:13 AM
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  15. austingreen

    austingreen Senior Member

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    induction motors are very old. the trade off is a slight loss of efficiency and added weight versus the ability to have higher less efficient power. If rare earth magnets get whacked by the trade war again then these induction motors should be relatively less expensive.

    Dual motor tesla's use one of each a permanant magnet motor in back and an induction motor up front.
     
    #15 austingreen, Aug 5, 2025 at 11:23 AM
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