Based on the stable brushless motor control code base we have for the STM32F722, we've created a drive suitable for controlling motors attached to propellers for leisure avionic purposes.
The enclosure and connector are designed to be capable of meeting with the requirements of IP67, the whole assembly including the drive electronics weighs approximately 245g.
We designed the hardware to support a wide battery input voltage range.
The connector has CAN and RS-485 connections to enable you to control the drive from a remote 'master' controller.
Should you choose to, you can also network these drives together.
We also have provision for a basic PWM input.
We've selected qualified devices from the world's leading semiconductor vendors for use in the drive.
The signal PCB has provision for a 3-axis accelerometer and 3-axis gyroscope - the data for which is available over CAN or serial.
The 32-bit microprocessor runs field-orientated control algorithms to control the power FETs with a sinusiodal drive. That gives the best possible performance from the motor, whilst efficiently operating the drive.
The signal connector is a Bulgin buccaneer, chosen because it is easily available through distribution, and provides a reliable sealed interconnection through an enclosure to a PCB.
External dimensions are 105 x 73 x 42mm
We received the boards in December 2019, and we are currently testing them using our propeller testing rig - see the snapshot in the gallery.
We're currently optimising the bulk capacitor choice for the drive, but we're almost there.
The unit is fully controllable via CAN. Software upgrades are possible over USB by using the bootloader code resident in all STM32 devices.
We'll post back when we're ready to ship units - but do let us know if you are interested in the drive.
Brushless 3-phase drive board