I hope to be able to put this to good use with the E+ motors that I have. The E+ motors are 3 phase motors that have integrated custom/proprietary controllers that require proprietary batteries. However, they should be able to be used as generic 3 phase ebike motors if the integrated controllers can be bypassed. This controller may even be used with the 7 phase Tidalforce motors but I'm not going to touch a beautiful motor/controller combination that is the Tidalforce system!
The ebikes.ca BAC500 is a field-oriented controller that uses sine-waves to feed power to the motor and so is much quieter than typical square-wave controllers. The buzz that you hear from your typical eBikes is usually the square-wave noise and the resultant noise generated by the motor windings. A FOC by definition automates the phase advance process so that the motor is driven at optimal timing even at very high RPMs.
The Tidalforce and E+ systems utilize sine-wave controllers so are extraordinarily quiet. In use, they are essentially completely silent.
The ebikes.ca BAC500 is a tiny package with a custom CNC torpedo shaped case. It's slightly thicker than a Cycle Analyst.