First of all, I am new in the community. I discovered ODrive a couple of weeks ago because I want to build a robot that uses brushless motors and I am seriously considering about getting one (or even several) ODrives.
But first, I would like to know the answers to some questions that I have. First I explain the context: my application is quite demanding and I would like to have quite a bit of torque specially at start up and also I would like to use the sensorless feature. Now, even though I think that I know just enough about motors in general, I am having a hard time understanding the specs that robotics suppliers provide about their motors. Here are the questions:
I was having a look at the motor: ‘9235-100KV Turnigy Multistar Brushless Multi-Rotor Motor’. According to their page, they have a spec that is Max Current = 57 Amps. My question is: this current refers to maximum continuous current? I mean, if I constantly apply a current of 57 amps, it should be fine, right?
For the same motor as before, what could happen if I apply higher currents? I would like to have a bit more torque for short periods of time (for acceleration) without using gearboxes. I could accomplish this by applying more current. Is it ok as long as the temperature of the motor does not raise too much? Or the motor could break? According to the datasheet, its resistance is just 0.055 Ohm. This means that at 48 volts, I could potentially reach around 400 amps (taking into account battery internal resistance). Is it ok to do so for short periods of time while monitoring that its temperature is not too high?? What would be that maximum temperature?? 100 degrees?
Regarding the ODrive: I have seen that it was designed with the use of encoder feedback in mind. However, I would like to use it in sensorless mode. Does it perform comparable to other ESCs in this mode?
I read the very nice article by Richard Parsons about the thermal performance of the ODrive. My question here is similar as for the motor. Is it ok if I apply large currents (of up to 300-400 amps) for a short period of time, as long as the temperature does not reach the 100 degrees? Or is there any risk of blowing up the board?
I really like the idea of the project, and I am an embedded system developer myself, so I will probably get one board anyway for experimentation, but some help regarding those questions will very much appreciated.
Thanks a lot beforehand!