Connect with us

News

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

Published

on

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:

Advertisement

“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.

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.

Advertisement
Comments

News

Tesla to lose 64 Superchargers on New Jersey Turnpike in controversial decision

Tesla is set to lose 64 Superchargers on the extremely busy and congested New Jersey Turnpike.

Published

on

Credit: Tesla

Tesla is going to lose 64 Superchargers on the New Jersey Turnpike after a decision by the Turnpike’s governing body was made not to renew its contract with the automaker.

On Friday, Tesla revealed that the New Jersey Turnpike Authority (NJTA) had officially decided to choose a sole third-party provider for its electric vehicle infrastructure. This resulted in the NJTA not renewing its contract to keep Tesla Superchargers on the toll road.

The NJTA also requested, with its decision not to renew with Tesla, that the company decommission all 64 Supercharger stalls, an unprecedented decision that will remove these plugs from the turnpike, making charging more scarce on the busy roadway.

Tesla detailed the situation on Friday:

“The New Jersey Turnpike Authority (“NJTA”) has chosen a sole third-party charging provider to serve the New Jersey Turnpike and is not allowing us to co-locate. As a result, NJTA requested 64 existing Supercharger stalls on the New Jersey Turnpike to not be renewed and be decommissioned.”

Tesla said it has been preparing for the potential that the Turnpike Authority would make this decision for three years by building 116 Superchargers nearby to still supply drivers with reliable charging infrastructure.

The company also noted that its Trip Planner would adjust automatically.

There were also efforts to maintain a relationship that would benefit both the Turnpike and EV drivers who use it.

Tesla said it offered the NJTA various “above-market commercial items,” like an offer to build Superchargers at all New Jersey Service Plazas with equipment upgrades like screens and adapters for those companies who have gained access to its charging piles but need to utilize the NACS and CCS1 plugs.

The decision is one that seemed to baffle the company, especially as infrastructure is one of the biggest concerns among EV skeptics:

“Tesla always advocates for more infrastructure and co-location with additional third-party charging providers. This drives down costs through optionality, and accelerates EV adoption by having sufficient capacity to shoulder peaks. We expect that ~30 times more fast-charging capacity is needed to get to full EV adoption. NJTA’s decision to remove, rather than add, critical charging infrastructure is a setback for New Jersey’s EV adoption goals of 100% Zero-Emission New Car Sales by 2035. It removes Turnpike access to the most reliable (99.9% uptime), least congested (<1% waiters) and cost-effective (~30% lower $/kWh) charging. “

The company said it was more than willing to invest in Turnpike sites if the Authority or New Jersey Governor Phil Murphy wanted to reverse the decision.

Continue Reading

News

SpaceX hit with mishap investigation by FAA for Starship Flight 9

Starship’s ninth test flight has the FAA requiring a mishap investigation from SpaceX.

Published

on

Credit: SpaceX

SpaceX has been hit with yet another mishap investigation by the Federal Aviation Administration (FAA) related to the company’s ninth test flight of Starship earlier this week.

The FAA said the mishap investigation is “focused only on the loss of the Starship vehicle, which did not complete its launch or reentry as planned.” The agency said the loss of the Super Heavy booster is covered by one of the FAA’s approved test induced damage exceptions requested by SpaceX.

All of Starship and Super Heavy booster debris landed within the designated hazard areas, the FAA confirmed.

SpaceX Starship Flight 9 recap: objectives & outcomes

It said it activated a Debris Response Area out of an abundance of caution as the booster “experienced its anomaly over the Gulf of America during its flyback toward Texas. The FAA subsequently determined the debris did not fall outside of the hazard area. During the event there were zero departure delays, one flight was diverted, and one airborne flight was held for 24 minutes. ”

SpaceX has become accustomed to mishap investigations by the FAA, as they have been impacted by them on several occasions in the past, including on Flight 8. However, they are a precautionary measure and usually are resolved within a few weeks.

Flight 9 was one of SpaceX’s most eventful, as there were several discoveries during the launch. First, it was SpaceX’s first time reusing a Super Heavy booster, as the one utilized for Flight 9 was also used on Flight 7 in January.

Contact with the booster and Starship were both lost during Flight 9. SpaceX said the booster was lost “shortly after the start of landing burn when it experienced a rapid unscheduled disassembly approximately 6 minutes after launch.”

Meanwhile, Starship was set to make a splashdown in the Indian Ocean, but the vehicle was lost about 46 minutes into the flight, SpaceX said in a mission recap.

It was an improvement from the previous two flights, as both 7 and 8 resulted in the loss of Starship after just a few minutes. Flight 9 lasted considerably longer. These flights are also not intended to make it to Mars, despite what other reports might try to tell you.

These are ways to gain information for when SpaceX eventually tries to get Starship to Mars.

Continue Reading

Investor's Corner

Tesla bull writes cautious note on Robotaxi launch: ‘Keep expectations well contained’

Morgan Stanley’s Adam Jonas is more cautious about Tesla’s upcoming Robotaxi launch.

Published

on

Credit: Tesla

Tesla analyst Adam Jonas of Morgan Stanley is telling investors to be wary of the Robotaxi details CEO Elon Musk revealed this week, after a report seemed to land on the prospective launch date of the platform in June.

Earlier this week, a report from Bloomberg indicated Tesla had internally landed on a tentative date of June 12 for its Robotaxi launch in Austin. Shortly after, Musk detailed the successful testing Tesla has already performed without anyone in the driver’s seat.

Tesla lands on date for Robotaxi launch in Austin: report

He also indicated Teslas would self-deliver to customers in June.

Analysts are now sending out investor notes on the announcement Musk made, along with the Bloomberg report. Jonas’s note is more cautious than others.

Jonas believes Tesla needs to shed more details before investors and fans of the company get too excited. He believes there is more information that could be released, but until then, he is suggesting investors “keep expectations well contained.”

He wrote:

“As is typical for highly anticipated Tesla events, we would keep expectations well contained for the (reported) June 12th Cybercab launch event in Austin. However, we would look for a continued stream of updates for the performance and growth of the network thereafter (numbers of cars, miles, trips, etc.) in the days and weeks that follow.”

The tone of Jonas’s note contradicts that of Wedbush’s Dan Ives, who believes the “golden age of autonomous” lies in Tesla’s hands. He seems to believe Tesla will come through on its June 12 launch.

Tesla set for ‘golden age of autonomous’ as Robotaxi nears, ‘dark chapter’ ends: Wedbush

Morgan Stanley’s note is slightly more

Jonas is obviously still bullish, but is much more tentative to move forward with an attitude that communicates skepticism about what Tesla has revealed.

Jonas and Morgan Stanley have a $410 price target on Tesla shares with a ‘Buy’ rating. Tesla stock is trading at around $358 at 12:15 p.m. on the East Coast.

Continue Reading

Trending