I recently bought a test kit (ESC) from ST that I used 2 days on to create a motor controller, and I liked the design so I am using it as template for a new controller. You will remember that I created a “ThunderStick” using DRV8301, basically a controller very close to the Vedder design.…
I am currently using DRV8301 from TI and is very happy with that one, but I want to add a 3rd Current Sensor so I can detect sensor errors and my eyes fell on DRV8353 and DRV8323 series. DRV8323 is 60V, while DRV8353 is 100V. I don’t mind the increase in voltage. The numbering is…
I recently discovered this chip (ISO1042) and wanted to share a circuit I found. This circuit is excellent, but it has two flaws: Firstly you need a small isolation coil 10-20uH between ISO 1042 and VCC1. This act as a filter so that higher frequencies used by the buck converter in ISO1042 do not disturb…
My previous entry show how to pre-calculate a Sinus table so we avoid doing this full speed because the next step is to convert this into a PWM pulse. A PWM pulse is measured in time – length – so we need to know the max length of a pulse. That is decided by the…
In the Trapezoidal algorithm we drove the field using six steps which works, but it is very inaccurate. I would like more steps and to do that I need to use a Sinusoidal algorithm. Sinusoidal means we create a sinus wave using PWM duty, in fact we create 3 sinus waves 120 degrees apart to…
I will try to annotate the motor driver algorithms starting with a simple, brute force Trapezoidal algorithm. If you try to read papers on motor drivers you will see a lot of advanced math, but you will find very few papers explaining how simple it actually is, so I will try to do that here.…
Many of you have seen this before – it’s my 60V/50A 3-Phase Motor Driver “Thunderstick”. It was a messy first assembly with greece coming through PCB holes, but I am all in all very happy with this design and will be using three of these controllers on the lawn mower. These are quite advanced drivers…
Soldered up a new board just to realize that DRV8301 was bust as well, so replaced DRV8301 and Buck converter is actually working. I am getting 3.4V just enouth for SPX3819 to give 3.2 out and the MCU ticks at 168Mhz. Looking at datasheet I also see that I have done correctlt – EN_BUCK should…
I have done a mistake by leaving EN_BUCK floating. The doc is a little vage around this area and I have copied that from other references that probably was not using the Buck Converter. The buck converter works, but it seems to give very little out. 168Mhz uses more than 84Mhz and power starts misbehaving.…
The yellow line is 5V and the blue line is 3.3V. I connected my scope to see if I saw something and the good news that it is not an interference problem at all. I basically have a horrioble ripple situation out from DRV8213. This indicate that my capacitors are not doing its job at…