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Posted by Imboeschi | Mar 13, 2016 @ 09:40 AM | 4,851 Views
In the past Iíve made some modifications to the Delta Ray electronics to allow the stock brick to be used safely with the Extreme 180 Pro motors.

In the meantime my daughter (who aircraft the Delta Ray is) has upgraded to larger and more powerful planes but she still likes the Delta Ray and asked me if I could do something about giving it more power and a bigger battery. More power basically means going brushless. As many people as aware, the major issue is that the Delta Ray uses a non-standard brushed motor drive signal (technically: itís a 15 kHz 3.3V positive PWM signal) for each of the two motors and apparently there are no brushless motor ESCs that can accept that signal.

What I did was modify BLHeli FW (which you can find here https://www.rcgroups.com/forums/show....php?t=2136895) so that it works when driven with the 15 kHz signal from the Delta Ray.

Note that there are two parts to BLHeli. BLHeli FW is the software that runs on the ESCs. BLHeliSuite is the PC software for managing, flashing and configuring the ESCs. Many more details are provided in the BLHeliSuite thread.

I need to point out at the beginning that this does require some minor hardware modification to the Delta Ray. There are various ways to do it, but all require some hardware modification (either constructing a simple circuit across the original motor drivers or exposing and wiring PCB traces on the brick) so if that isnít something you want to do then this isnít for you.

...Continue Reading
Posted by Imboeschi | Nov 14, 2015 @ 11:50 AM | 4,728 Views
This posting contains an overview of the design of the improved Delta Ray ESC for use with the Xtreme 180 motors. The improved ESC provides the following advantages:
  1. A power gain of roughly 10% over the stock ESCs (also about the same percentage increase for stock motors
  2. Elimination of the risk of blown MOSFETs in the stock ESC
  3. A replacement for a compromised/blown ESC on the Delta Ray stock brick
The disadvantage is a weight penalty of about 10g, using through-hole components.

The schematic of the ESC is shown in the figure below. Fortunately there are very good ICs for driving power MOSFETs and for this project I chose the Microchip MCP14E10 (see specifications here: http://www.microchip.com/wwwproducts...oduct=MCP14E10). This part is actually overkill for the task but oddly enough it was cheaper than lower-specced parts at my local electronics distributor.

It simply takes the 15 kHz PWM signal from the Delta Ray brick (the inputs marked In-L and In-R) and generates the drive signal for the power MOSFETs (the parts marked QL and QR). The motors are wired across the flyback diodes (VML+, VML-, VMR+ and VMR-). The MCP14E10 switches the MOSFETs so rapidly that transient losses (and therefore heating) are essentially eliminated.

The battery is connected directly to VB+ and VB-. The terminals marked VB+o and VB-o are to provide the battery signal to the Delta Ray brick.

Apart from the MCP14E10, this design is essentially a copy of the stock Delta Ray ESC –...Continue Reading