Please see the picture within this article.
It's probably a device from Cascadia, Unitek, Sevcon, or Emsiso.
The motor looks like an Emrax axial flux motor. At one point, Emrax's user guide said their motors are compatible with controllers from the four manufacturers I listed above. Now, the user guide just links to a broken URL.
Cascadia used to be Rinehart Motion Systems. Cascadia's controllers are more expensive, but their documentation and support is excellent. I would highly recommend their systems.