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How Do Electric Cars Produce Instant Maximum Torque?

Torque

How Do Electric Cars Produce Instant Maximum Torque?



Why Do Electric Motors Have Peak Torque At 0 RPM?
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What about electric motors allows them to have maximum torque available at zero RPM? In this video we’ll talk about how electric motors work, how generators work, how back EMF plays into this, and why electric motors produce peak torque from a standstill.

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From NWAPA’s press release on Drive Revolution:
“The NWAPA Drive Revolution field included gasoline-electric hybrid models, plug-in hybrids, battery- electric vehicles and a hydrogen fuel cell car.

Following a full day of testing on the streets of downtown Portland, Oregon, the journalists selected the 2017 Chevrolet Bolt EV as the Northwest Green Car of the Year. Members felt that the Bolt EV’s exceptional range, reasonable price tag, and generous interior room provide Northwest consumers with an excellent blend of the attributes that they’re looking for in an electrified vehicle.

“The Bolt EV more than doubles the range of other affordably priced battery-electric vehicles,” said event co-chair Sarah Shelton of U.S. News & World Report. “With the ability to travel up to 238 miles on a single charge, the Bolt EV is a game-changer in the green vehicle market and a glimpse of things to come.”

Pricing for the 2017 Chevrolet Bolt EV starts at $36,620, and many Bolt EV buyers will qualify for a $7,500 federal tax credit. The Bolt EV Premier model tested had a price tag of $43,510.

Using a secret ballot, the attendees also selected the following category winners:

Northwest Battery-Electric or Fuel Cell Vehicle of the Year:
2017 Chevrolet Bolt EV

Northwest Family Green Car of the Year:
2017 Chrysler Pacifica Hybrid

Northwest Plug-In Hybrid of the Year:
2017 Chevrolet Volt

Northwest Alternative Fuel Sports Car of the Year:
2017 BMW i8

As one of the leading cities in the nation for the adoption of alternative fuel vehicles and vehicle charging infrastructure, Portland provided an exceptional backdrop for the fifth annual event. Drive Revolution followed on the heels of one of the country’s premier future mobility conferences – EV Roadmap.”

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40 Comments

40 Comments

  1. Jaime Duncan

    July 25, 2017 at 12:37 pm

    Best explanation ever, your videos are off the best for people that want to learn , not his be entertain. They are ease to watch too. Keep the good work

  2. Kevin Toly

    July 26, 2017 at 12:44 pm

    No mention of inrush current to motors.

  3. Chris Johnson

    July 26, 2017 at 8:51 pm

    Thankfully i took Physics II in college. IT CAME IN HANDY.

  4. LivingLifeElectric

    July 27, 2017 at 4:43 am

    Watch out for Electric Scooters please…

  5. bin1127

    July 28, 2017 at 8:29 am

    So BEMF does work in an electric motor or does a drag on the motor?

  6. ANiMOSiTYZA

    July 28, 2017 at 8:37 am

    For the first time, I actually disagree about something 🙂
    As always, fantastic channel, obviously!

    You said that manufacturers engineer their internal combustion engines to produce peak torque as low-down as possible, because that makes them the most responsive and most enjoyable?
    I disagree with that. There's nothing more fun than a linear naturally aspirated engine that makes peak torque higher-up in the rev range.
    I've had many fun NA vehicles and I now have an F10 M5, which is artificially tuned to deliver its power as if it were naturally aspirated.
    Sure, there's a huge rush of torque pretty-much anywhere in the rev range, but it pulls progressively harder as the engine's RPMs climb.

    Which brings me to a question for you.
    Do you not think that the primary reason these manufacturers try to make peak torque as low down as possible, is to make the cars both easier to drive and more efficient by lowering the point of boost threshold? (Nothing to do with turbo lag)

  7. Simon Coles

    July 28, 2017 at 8:41 am

    peak torque at high RPM is way more fun to drive

  8. Albert Ochoa

    July 28, 2017 at 9:54 pm

    A world without whiteboards wouldn't be the same.

  9. Tadhg Bolen

    July 28, 2017 at 11:23 pm

    so essenttially if you can engineer out bsck emf you could create the worlds first perfect motor lol

  10. delza brown

    July 30, 2017 at 3:08 pm

    Imma put this comment on every new video, make a video on good books made by engineers for engineers automotive/motorsport

  11. Owen Miller

    July 31, 2017 at 3:22 am

    Hi buddy! ! tell Anybody identify one's better than thms xqrk

  12. Joost Citroen

    July 31, 2017 at 10:05 am

    finally belly pan soul phrase base deal traveler math desk.

  13. Grzegorz Durda

    August 1, 2017 at 10:35 pm

    Gregus 1:1 And the God said onto him. For every discovery of the world i constructed for and around you, your life and the life of your subsequent generations will be improved.

  14. Azzi2000

    August 4, 2017 at 10:41 am

    Faze up

  15. PANTYEATR1

    August 5, 2017 at 12:22 am

    I really want to know why electric cars aren't self sustaining yet? why can't they charge themselves as they are running without needing to stop to be plugged in and charged or needing a gas engine?

  16. Santiago Duenas

    August 5, 2017 at 5:14 pm

    When you refer to voltage needed, are you referring to amperage draw?

  17. Carlos Armenta

    August 6, 2017 at 8:04 pm

    ohh now that you explain it that way I understand it..lol don't know wtf you saying but it sounds legit

  18. goomba008

    August 16, 2017 at 7:09 pm

    Could you make a video about why the Lorentz force is a consequence of special relativity, namely differing electron density in the current-carying wire depending on the frame of reference's speed?

  19. kufman01

    August 16, 2017 at 10:52 pm

    Pretty cool video but your torque curve is a little off. There is no "flat top" to the torque vs rpm curve. Torque is a maximum at 0 rpm and then drops linearly to 0 at max rpm. Love the videos, keep it up!

  20. Gran's Stuff

    August 17, 2017 at 11:07 am

    Does this mean that even when you are going uphill, as you use power to spin the motor, some power will get back to the batteries? Or does it only help to run the motor with less power?

  21. Joshua Richards

    August 17, 2017 at 12:28 pm

    Doesn't this mean that an EV will have lower and lower amounts of torque as it speeds up? And, that being the case, would it be actually beneficial to move to a higher gear ratio to reduce back EMF, or would that be a wash as far as total torque available?

  22. Sirpalmtree

    August 17, 2017 at 3:00 pm

    This is how I understand it, please CORRECT ME IF I'M WRONG: The motor uses electrical currents to spin an electromagnet (the armature) which is connected to the axle. The motor creates resisting voltage, or back EMF (electromotive force), which decreases torque. But, when the motor is not spinning it doesn't create any back EMF, so all the voltage is used to create torque. Once the motor is spinning faster, back EMF/resistance comes in, and torque goes down…right?

  23. Sirpalmtree

    August 17, 2017 at 3:16 pm

    Is it physically possible to completely remove back EMF to allow EVs to produce a constant peak torque at all RPM?

  24. Jeff Beasley

    August 18, 2017 at 2:26 am

    Small but important correction… Higher motor speed does not induce more current, it induces more voltage. The current comes from torque.

  25. kentuckywaves

    August 18, 2017 at 10:56 pm

    You keep saying it is available at zero RPM. You know that peak torque is available only at any RPM above zero, so why do you keep repeating this? No torque is available at zero RPM because the motor is not working. Please correct.

  26. steve johnston

    August 19, 2017 at 10:40 pm

    Why are we talking about inefficient maintenance heavy brushes motors? Manufacturers are using brushed motors? Y? Are they not clever enough to build a controller for s brushless motor! Brushless motors are way more efficient than brushed motors and require less maintenance so surely the brushless motor is the way to go.

  27. hausaffe

    August 20, 2017 at 8:31 pm

    your 2nd graphic is wrong you need to use the same hand but your force vector is reversed because you are braking and not accelerating

  28. Mehmet Yeşilyurt

    August 21, 2017 at 8:58 am

    So this is why electric cars are faster at lower speeds but the acceleration slows down and ice engines take over at higher speeds. Because of back emf

  29. outback joe

    August 22, 2017 at 12:27 pm

    Hey mate your video relates to traditional brushed DC motors which doesn't really apply to modern cars. Aren't the high powered cars that report instant maximum torque usually AC induction motors? AC induction motors use an inverter and are able to apply the required frequency and voltage to maintain maximum torque at any rpm from 0 to maximum. Applying full line voltage and frequency at zero rpm (which is the AC equivalent of the maximum working voltage you describe for a DC motor at zero rpm) results in less than maximum torque, poor power factor and high magnetic losses. Similarly brushless DC motors use an inverter and don't necessary follow the torque curve of traditional brushed motors, since the inverter can manipulate the voltage and phase angle and produce different results.

  30. sverek

    August 22, 2017 at 12:46 pm

    Engineering Explained with Vacuum cleaner! Thank you, I finally understood it. Subscribed.

  31. Bradley Farnum

    August 23, 2017 at 5:39 pm

    Great explanation. As a fellow engineer, I appreciate your technical explanation.

  32. Elijah Drew

    August 24, 2017 at 3:15 am

    Is there any point in which the back EMF is greater than the voltage being supplied?

  33. John Burns

    August 27, 2017 at 11:48 am

    Your lights dim when switching on a vacuum cleaner? You need your electrical system seeing to urgently.

  34. A. Saleh

    August 28, 2017 at 12:40 am

    This is still not the most fundamental explanation. Electricity is simply more robust than combustion, unless you want an explosion, you can't use combustion to deliver maximum energy instantly, whereas with electricity you can. For those who don't know, If you have a battery and a load (e.g a light bulb), all it takes to instantly have the maximum current run through the load is close the circuit, it's pretty much the same with electric motors, but you don't see people surprised how light bulbs work instantly as they are with electric motors, because they don't realize they're fundamentally governed by the same principles.
    When you explained the thing about back-EMF, you're assuming the average person already knows that voltage sources can instantly deliver max energy to loads.

  35. Mangalex28

    September 1, 2017 at 12:06 pm

    0:40 EWWWWW gross

  36. Mangalex28

    September 1, 2017 at 12:28 pm

    I got lost at the back EMF stuff… I don't understand how this back current means you have full Torque, gonna have to rewatch! (Or if someone can explain in other words). I understood that, your motor isn't spinning so you have no resistance, okay, but then you apply current, your motor spins which generates a back EMF and…. I don't see how it's linked to the FULL RPM stuff.

  37. Nishant F1

    September 4, 2017 at 4:18 pm

    Awesome stuff!! Never understood instant torque before this.

  38. Anthony Vanover

    September 6, 2017 at 6:10 pm

    So in order to maintain peak torque in an EV, you would need to add more gears and shift early? Also, since horsepower is torque × rpm and if the goal is to maximize horsepower, would it be better to stay at a higher torque with a lower rpm or a lower torque at a higher rpm?

  39. Ivan Ivanov

    September 7, 2017 at 10:10 pm

    lots of talk, lots of water

  40. Hyper Sonic

    October 28, 2017 at 4:19 am

    Back EMF is how regenerative braking works? Can energy from back EMF be collected while driving the motor, not just while braking?

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