[Al Skierkiewicz]

OK,
I thought it was time to make a chart, so here is a spreadsheet and chart. I took the values that have been mentioned here although they are not taken from published data. In calculating motor current, I simply took the motor winding resistance and stated inductance and plotted the result against duty cycle. Please note that I also multiplied the 15kHz values by 10 so that the current would at least approximate the current accumulated over the same time interval. The table certainly has a telling tale to tell in comparing duty cycle ON time with inductance rise time.
Note that this table and chart do not take into account the switching frequency of the commutator or the dead band in between segments. Nor does it make an attempt to average current. It merely is comparing the max current that could be achieved during the 150 Hz ON time period due to motor winding resistance and inductance. Please note that the 100% duty cycle 150 Hz switching frequency does approximate the published 133 amp stall current of the CIM.
Although the 15kHz current does look linear, please note that the plot is merely in a linear region of the same type of curve do to the stretched time base of the horizontal axis. The values are real though. At 15kHz, the motor current cannot rise to near max values even at 100% duty cycle due to the L/R time constant vs input frequency.
Remember that series wiring resistance, controller Rdson resistance, battery voltage and many other variables will serve to change these values.