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Tesla’s ‘rotor geometry’ patent hints at more efficient electric motors

Published

6 years ago

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Tesla has invented a technique for increasing its all-electric vehicles’ power and torque by simply adjusting the shape of some of its electric motor’s components.

A recently published US patent application titled “Geometry of Rotor End Ring and Stator End Turns” describes how Tesla accomplishes this. According to the application, certain internal parts of an electric motor can be modified to reduce power losses from leaks in the magnetic field that effectively make the motor smaller.

The primary components of electric motors – the rotor and the stator – together generate the motion used to operate a vehicle. Simply, a magnetic field produced by electricity running through copper wires in the stator cause the magnetized bars of the rotor to spin. However, when the motor is operating at high speed, some of the electromagnetic force is lost, reducing the motor’s power.

Figure 2 from Tesla’s U.S. Patent Application No. 2019/0097508 | Credit: Tesla

Tesla has identified two places where this loss can be reduced – the end parts of the stator and rotor. The copper wiring in these parts is wrapped around cutout shapes, and after some testing, Tesla’s engineers learned that different shapes give different results. Per the application, “geometries for rotor end ring and stator end turns can be chosen in a way that improves performance or other characteristics of the motor.”

Overall, electric current flow becomes concentrated in different spots on the motor depending on the ‘geometry’ of these parts, thus an opportunity to limit any losses has presented itself by controlling where the concentrations happen. Tesla has filed this application to protect the process (‘method’) of building a motor with the geometry knowledge made part of the design and testing.

The process is described in the application’s Abstract as follows:

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“A method of making an AC induction motor includes: providing a rotor and a stator for the AC induction motor; determining, for different geometries of an end ring of the rotor, a location of a first centroid of current density in the end ring; determining, for end turns of the stator, a location of a second centroid of current density in the end turns; selecting a geometry for at least the endring of the rotor so that an axial distance between the first centroid of current density and the second centroid of current density is minimized; and assembling the AC induction motor, wherein the end turns and the end ring have the selected geometries.”

Figure 3 from Tesla’s U.S. Patent Application No. 2019/0097508 | Credit: Tesla

Although the publication was only recently available to the public, this application is related to another patent that was filed in 2015, meaning that Tesla is likely already implementing the findings and invention into their manufacturing process. This is rather unsurprising considering the company’s tendency to constantly improve its vehicles’ components as soon as the upgrades are available. Elon Musk himself has mentioned this on Twitter, stating that Tesla’s electric cars are “partially upgraded every month as soon as a new subsystem is ready for production.” This was also highlighted by President of Automotive Jerome Guillen last December, when he highlighted that the designs of Tesla’s batteries are always evolving.

Automotive teardown expert Sandy Munro concluded following a thorough analysis of an early-production Model 3 that the vehicle’s electric motors are among the best in the industry today. In an appearance at YouTube’s Autoline TV, Munro noted that the Model 3’s electric motors are more efficient and more cost-effective than the motors found in the Chevy Bolt EV and the BMW i3. “They’ve got magic. The electric motor is smaller and lighter than everybody else, but outperforms everybody,” Munro said.

The full text of Tesla’s “Geometry of Rotor End Ring and Stator End Turns” patent can be accessed here.

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Accidental computer geek, fascinated by most history and the multiplanetary future on its way. Quite keen on the democratization of space. | It's pronounced day-sha, but I answer to almost any variation thereof.

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Elon Musk commends Tesla team on successful Robotaxi launch

Tesla CEO Elon Musk commended the company on the successful launch of Robotaxi.

Published

49 minutes ago

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June 23, 2025

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NORAD and USNORTHCOM Public Affairs, Public domain, via Wikimedia Commons

Tesla CEO Elon Musk commented on the company’s launch of the Robotaxi platform, which officially went live to a small group on Sunday in Austin, Texas.

It is the first time Tesla has offered driverless rides through the ride-hailing platform it has worked to activate for several years, and it was overwhelmingly successful based on early reviews.

The launch was coupled with the release of the first-ever looks at the Tesla Robotaxi app, which does more than allow riders to summon vehicles for transportation. It also allows the rider to adjust climate settings in the car before it arrives for a comfortable ride, and it will sync entertainment and streaming settings to keep occupants entertained.

Tesla Robotaxi riders tout ‘smooth’ experience in first reviews of driverless service launch

The first rides are being performed with a safety monitor in the passenger’s seat. These monitors have no control over the vehicle, and are there just to ensure smooth operation.

The first reviews called rides “smooth” and “comfortable,” and commended Tesla for its hard work over the past few years to make this happen. Many were impressed with the cars’ ability to keep pedestrians safe, avoid congested parking lots, and the efficiency of the rides, as the time from the ride request to the Robotaxi accepting the ride was extremely fast.

Musk has been at the forefront of this operation for a decade, as Tesla has been working to release a version of the Robotaxi through the development of Full Self-Driving. This has been an effort that included seeking top-tier engineering talent and taking incredible leaps of faith, including switching to a Vision-only approach for Full Self-Driving.

Musk commended the Tesla team for its hard work:

It’s truly an incredible accomplishment, as many considered Robotaxi a “failure” despite it not even being rolled out. In May, we reported on media outlets calling the Robotaxi rollout a total failure, despite Tesla always maintaining the launch would happen in June:

Tesla Robotaxi deemed a total failure by media — even though it hasn’t been released

Hundreds of rides have already been taken, and there have not been many complaints. It’s an incredible jump forward for Tesla.

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Tesla Robotaxi riders tout ‘smooth’ experience in first reviews of driverless service launch

The first reviews of Tesla Robotaxi are in, and those riders are impressed and astounded with the smooth and comfortable nature of the service.

Published

3 hours ago

on

June 23, 2025

By

Credit: Joe Tegtmeyer | X

Tesla Robotaxi riders are touting their awesome experiences in their first rides using the automaker’s new driverless ride-hailing service, which launched to a limited number of people yesterday for the first time.

On Sunday, Tesla officially launched Robotaxi, its driverless ride-hailing service, in downtown Austin. A select group of people were chosen to receive early access to the program, as well as the new Robotaxi app, which is used to request a ride and will sync everything from climate preferences to streaming settings with each pickup.

Tesla officially launches Robotaxi service with no driver

Teslarati gained access to the Early Access riders program and the Robotaxi app, giving us a first-hand look at the experience. We will be in Austin soon to test out the Robotaxi fleet for ourselves.

However, those who were there for the initial rides on Sunday had nothing but great things to say. Hundreds of rides were taken during the first hours of the Robotaxi program, and neither the company nor the riders reported any issues.

Here’s what people said about their experiences:

  • “Extremely smooth stops,” and great awareness of road conditions, including pedestrians, speed bumps, and busy parking lots, were all handled with ease:

  • Safe navigation around pedestrians who walked just off the sidewalk into the road:

  • “Just as good as it is during the daytime” at night. There were no changes to report by riders who took rides during the day and evening:

  • Avoided expensive and stressful parking at local tourist hotspots like Terry Black’s Barbeque:

  • “Comfortable and similar to existing Tesla cars with FSD,” intuitive and “surreal” experience:

  • The app is quicker than other ride-sharing services. When a destination is chosen, Robotaxi is already on the way to your location:

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Tesla Robotaxi rollout proves that Elon Musk still delivers, even if it’s late

Tesla is also still the company that makes the impossible feel late.

Published

6 hours ago

on

June 23, 2025

By

Credit: Tesla

It took a long time, but Tesla has finally successfully rolled out its dedicated Robotaxi service in Austin this weekend. The initial rollout only involved a small fleet of cars operating in a small geofenced area in Texas, but it is still significant. 

It does, if any, prove that Elon Musk is still capable of delivering on his promises, even if they are late. Tesla is also still the company that makes the impossible feel late.

Finally, a Rollout

Elon Musk has been predicting a Robotaxi rollout for years, so much so that even avid Tesla supporters have grown quite wary of his constant predictions. After a while, Elon Musk himself admitted that he has become the boy who cried FSD, though he still maintained that self-driving was really just around the corner.

This past weekend, Musk’s predictions finally came true. Actual paying customers used Tesla’s dedicated Robotaxi service for a small flat fee of $4.20 per ride. Elon Musk seemed quite happy with the Robotaxi’s initial launch, as evidenced by his congratulatory message to the Tesla AI team on X.

https://twitter.com/elonmusk/status/1936876178356490546
https://twitter.com/aelluswamy/status/1936865682810946035

No More Tesla Vision Debates

One thing that is evident in Tesla’s initial Robotaxi rollout in Austin was the fact that the debate surrounding Tesla’s vision-only approach is completely gone now. With actual Robotaxis operating around Austin, there are no more questions about whether cars can navigate city streets on their own using only AI and cameras. They can, and safely too, at least based on Tesla’s initial fleet of Robotaxis.

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https://twitter.com/ItsKimJava/status/1936927640268484909
https://twitter.com/SawyerMerritt/status/1936997202880081950

The Beauty of Normalcy

The Robotaxi rides from Tesla owners who were fortunate enough to experience the first driverless rides from the EV maker’s fleet were quite uneventful. Comments on social media platforms such as X observed that the Robotaxis operated safely and cautiously, and their driving was actually smoother than some human drivers. 

That may not sound very exciting at all, but that’s the beauty of it. Tesla’s Robotaxi service is designed to look and feel natural to people. And so far, it appears that Tesla is accomplishing this with its Robotaxi rollout.

https://twitter.com/DrKnowItAll16/status/1936992009685700663
https://twitter.com/DirtyTesLa/status/1936999390100496443
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