Lacroix Stormcore VS Focbox Unity | contrast figure2 weeks, 4 days ago | 1 Replies
EnMotion is the first company in the world to produce a single MCU motor controller based on the VESC® motor controller program. The device is called Focbox Unity 7. Product development took several months and many iterations, but the product proved to be very reliable, with more than 5,000 units sold and delivered worldwide.
The LaCroix Stormcore 60D is the next MCU motor controller to hit the market. It was designed by former Ention engineers Charles & Jeff. It’s fair to say they got some existing knowledge from Ention before diving into the Stormcore project
The two brands are actually very similar in terms of parts, with 95% of the parts on the material list identical. The most significant difference is that the Stormcore 60D has three low-side shunters, while the Focbox Unity has only two.
Stormcore also uses the newer Texas Instruments DRV chipset, which is not commonly used in VESC® based motor controllers and was only recently compatible with core VESC® firmware. As with all new ICs, there are common teething issues that need to be resolved through multiple hardware revisions, and the overall product reliability is sure to improve over time.
DRV problems were the biggest cause of failure in early VESC® motor controllers, and these DRV failures plagued the original VESC® design for years before engineers determined the perfect placement of capacitor and component locations to minimize noise and improve overall robust hardware.
This subtle design change between focbox and stormcore is usually not enough to change performance or be noticed by the average rider cruiser. However, if you are a real performance buff and enjoy measuring your motor current and duty cycle around, you may be able to study the chart after the ride and determine the different features that the third shunt brings.
The main idea behind the 3 shunt design is to improve the accuracy of current measurement during rapid acceleration of high RPM and/or high kV motors from zero to maximum duty cycle.