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Tesla’s ‘rotor geometry’ patent hints at more efficient electric motors
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.
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:
“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.”
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.
Tesla Cybertruck is significantly different from traditional pickups on the market in a lot of ways. However, one feature that was recently modified with its interior was a highly requested characteristic that is present in other trucks, but was void from Cybertruck.
Tesla went with a five-seat configuration with Cybertruck: two in the front and three in the back. The spacious interior is matched with plenty of storage, especially up front, as a pass-through, center console, and other storage options, but some Tesla fans wanted something different: bench seating.
Bench seating is popular in many full-size pickups and allows three passengers to sit up front. The middle seat is usually accompanied by a fold-down storage unit with cupholders.
Tesla decided to opt for no bench seating up front, despite the fact that it equipped bench seating in the unveiling in 2019. Interior photos from the unveiling event from nearly six-and-a-half years ago show Tesla had originally planned to have a six-seat configuration.
This was adjusted after the company refined the design:
(Tesla Cybertruck interior configuration in 2019)
Despite Tesla abandoning this design, it does not mean owners were willing to accept it. One owner decided to modify their Tesla Cybertruck interior to equip that third seat between the driver’s and passenger’s thrones.
The fit is snug, and while it looks great, it is important to remember that this does not abide byregulations, as it would require an airbag to be technically legal. Please do not do this at home with your own Cybertruck:
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- Credit: @blueskykites
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- Credit: @blueskykites
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- Credit: @blueskykites
The Cybertruck is a popular vehicle in terms of publicity, but its sales have been underwhelming since first delivered to customers back in 2023. It’s hard to believe it’s been out for two-and-a-half years, but despite this, Tesla has not been able to come through on its extensive order sheet.
This is mostly due to price, as Cybertruck was simply not as affordable as Tesla originally planned. Its three configurations were initially priced at $39,990, $49,990, and $69,990. At release, Cybertruck was priced above $100,000.
This priced out many of those who had placed orders, which is the main reason Cybertruck has not lived up to its expectations in terms of sales. The adjustments to the specific features, like the removal of the bench seat, likely did not impact sales as much as pricing did.
This modification shows some creativity by Tesla owners, but also shows that the Cybertruck could always be the subject of a potential refresh to include some of these features. Tesla routinely adjusts its vehicle designs every few years, so maybe the Cybertruck could get something like this if it chooses to refresh its all-electric pickup.
Elon Musk
Tesla CEO Elon Musk drops massive bomb about Cybercab
“And there is so much to this car that is not obvious on the surface,” Musk said.
Tesla CEO Elon Musk dropped a massive bomb about the Cybercab, which is the company’s fully autonomous ride-hailing vehicle that will enter production later this year.
The Cybercab was unveiled back in October 2024 at the company’s “We, Robot” event in Los Angeles, and is among the major catalysts for the company’s growth in the coming years. It is expected to push Tesla into a major growth phase, especially as the automaker is transitioning into more of an AI and Robotics company than anything else.
The Cybercab will enable completely autonomous ride-hailing for Tesla, and although its other vehicles will also be capable of this technology, the Cybercab is slightly different. It will have no steering wheel or pedals, and will allow two occupants to travel from Point A to Point B with zero responsibilities within the car.
Tesla shares epic 2025 recap video, confirms start of Cybercab production
Details on the Cybercab are pretty face value at this point: we know Tesla is enabling 1-2 passengers to ride in it at a time, and this strategy was based on statistics that show most ride-hailing trips have no more than two occupants. It will also have in-vehicle entertainment options accessible from the center touchscreen.
It will also have wireless charging capabilities, which were displayed at “We, Robot,” and there could be more features that will be highly beneficial to riders, offering a full-fledged autonomous experience.
Musk dropped a big hint that there is much more to the Cybercab than what we know, as a post on X said that “there is so much to this car that is not obvious on the surface.”
And there is so much to this car that is not obvious on the surface
— Elon Musk (@elonmusk) January 2, 2026
As the Cybercab is expected to enter production later this year, Tesla is surely going to include a handful of things they have not yet revealed to the public.
Musk seems to be indicating that some of the features will make it even more groundbreaking, and the idea is to enable a truly autonomous experience from start to finish for riders. Everything from climate control to emergency systems, and more, should be included with the car.
It seems more likely than not that Tesla will make the Cybercab its smartest vehicle so far, as if its current lineup is not already extremely intelligent, user-friendly, and intuitive.
Investor's Corner
Tesla Q4 delivery numbers are better than they initially look: analyst
The Deepwater Asset Management Managing Partner shared his thoughts in a post on his website.
Longtime Tesla analyst and Deepwater Asset Management Managing Partner Gene Munster has shared his insights on Tesla’s Q4 2025 deliveries. As per the analyst, Tesla’s numbers are actually better than they first appear.
Munster shared his thoughts in a post on his website.
Normalized December Deliveries
Munster noted that Tesla delivered 418k vehicles in the fourth quarter of 2025, slightly below Street expectations of 420k but above the whisper number of 415k. Tesla’s reported 16% year-over-year decline, compared to +7% in September, is largely distorted by the timing of the tax credit expiration, which pulled forward demand.
“Taking a step back, we believe September deliveries pulled forward approximately 55k units that would have otherwise occurred in December or March. For simplicity, we assume the entire pull-forward impacted the December quarter. Under this assumption, September growth would have been down ~5% absent the 55k pull-forward, a Deepwater estimate tied to the credit’s expiration.
“For December deliveries to have declined ~5% year over year would imply total deliveries of roughly 470k. Subtracting the 55k units pulled into September results in an implied December delivery figure of approximately 415k. The reported 418k suggests that, when normalizing for the tax credit timing, quarter-over-quarter growth has been consistently down ~5%. Importantly, this ~5% decline represents an improvement from the ~13% declines seen in both the March and June 2025 quarters.“
Tesla’s United States market share
Munster also estimated that Q4 as a whole might very well show a notable improvement in Tesla’s market share in the United States.
“Over the past couple of years, based on data from Cox Automotive, Tesla has been losing U.S. EV market share, declining to just under 50%. Based on data for October and November, Cox estimates that total U.S. EV sales were down approximately 35%, compared to Tesla’s just reported down 16% for the full quarter. For the first two months of the quarter, Cox reported Tesla market share of roughly a 65% share, up from under 50% in the September quarter.
“While this data excludes December, the quarter as a whole is likely to show a material improvement in Tesla’s U.S. EV market share.“
Tesla Cybertruck undergoes interior mod that many owners wanted
Tesla CEO Elon Musk drops massive bomb about Cybercab
