A black and white infographic titled "Market Facts" showing data about electric vehicle (EV) market and rare-earth mineral production. It includes information on power use, market value, EV motor and charger statistics, and mining contributions by China, the US, and neodymium magnet production.

The word’s best rare-earth electric machine

Scroll to learn more about the difference that a Jacobi Variable Flux Memory Motor (VFMM) can make

The Jacobi VFMM Difference

Traditional motor technologies are locked into fixed efficiency zones

—optimized for only one operating condition, and compromising elsewhere.

Efficiency graph showing torque versus speed with red peak envelope and blue continuous envelope curves, highlighting inverter power limits and labeled regions for SPM, IPM, IM, and SR motors.

Jacobi VFMM technology dynamically shifts the efficiency zone

—align with real-time performance demands for peak efficiency

Plot showing VFMM efficiency shifting

The Result?

One motor that adapts like four

From launch to cruise, uphill to regen, VFMM delivers the performance of multiple motors

Efficiency graph showing torque versus speed with peak envelope in red and continuous envelope in blue, illustrating motor performance limits and rotor types.

We’ re showing that you don’t have to rely on rare-earths to achieve high performance, high efficiency, and high power density

Bar chart comparing 5-cycle range estimates in miles for IPM, IM, and VFMM, with IPM and VFMM both at 272 miles and IM at 262 miles.

Range Compared using Tesla Model 3 Vehicle Model

Some say it is science fiction…

“In an ideal brushless drive, the strength of the magnetic field produced by the permanent magnets would be adjustable. When maximum torque is required, especially at low speeds, the magnetic field strength (B) should be maximum – so that inverter and motor currents are maintained at their lowest possible values. This minimizes the I² R (current² resistance) losses and thereby optimizes efficiency. Likewise, when torque levels are low, the B field should be reduced such that eddy and hysteresis losses due to B are also reduced. Ideally, B should be adjusted such that the sum of the eddy, hysteresis, and I² losses is minimized. Unfortunately, there is no easy way of changing B with permanent magnets.”

-Wally Rippel, 2007, Tesla Motors

“A large portion of the time people spend driving is in low-torque highway situations. However, there are a lot of motors that offer great 0-60 MPH performance but are very inefficient in the low-torque highway-speed regions. So the question is, can I have everything – both high efficiency and high performance? The answer, unfortunately, is no. But you can make intelligent choices between things that are competing with each other.”

-Konstantinos Laskaris, 2016, Tesla Motors

… but at Jacobi, we’ve spent the last seven years proving the improbable

in the lab, on the track, and in the field

Watch the video or find out more about the