And 385 Hz is not fast by any transistor standards. So the challenge now is creating an interface that allows the PWM device to correctly drive the IGBT that you have. And given the current draw of your motor you will need to be driving that transistor into saturation quite rapidly, and also you will need a heat sink. And you will need at least one resistor, which the value will take a bit of math to figure.The duration of whatever event occupies 2.6 divisions is 2.6mS. If that event is the full pulse period then the pulse frequency is 1000/2.6 = 385Hz.
I am thinking that your IGBT needs to have the gate voltage positive relative to the emitter terminal in order to start conducting. So at this point it is useful to look at the data sheet for the device, which I have not done yet. Do you have the data sheet, or at least a link to it? At this point it is needed to be able to know how to switch it on and get it into saturation, because it will need to be switched fully on for driving the motor.