Now let's look even closer at this 1/800th second "on time" during which 20 A "Motor Amps", on average, is flowing.

When the switch turns on at the beginning of 1/800th second, does current jump to 20 A instantaneously?

actually no. since "the electrical load" (ie motor) features an iron core (stator) and magnets, it is considered a "inductive load".

if the winding wire were straight, and there were no magnets or steel stator core, the "winding" would be considered a purely "resistive" load.

however, with the presence of magnets and a steel core, we must treat this as an inductive load.

an important aspect of an inductive load is current requires much more time to change. typically, (and in yet another dramatic oversimplification) the mere presence of this inductivity matters much more than the typical actual numerical magnitude of this inductivity.

since current (amps) requires much more time to change with an inductive load, and we are using inductive load for 1/800 of a second, the fact is when the circuit turns on at the start of the 1/800 of a second, The current does not reach 20 A immediately. The 20 amp "motor amp" value is an average over the entire 1/800 of a second. As an average it has minimum, and maximum values, and total time (1/800 of a second). The minimum value is zero at the start of the 1/800 of a second. The maximum value is such that the average of minimum and maximum during the course of the 1/800 of a second equals the averaged 20 "motor amps" value for 1/800 second.

it turns out that when pulsed dc amps is graphed on a chart, the minimum and maximum values of the "on time" combined with on-off duty cycle and fact of inductive load makes the graph resemble the appearance of a Saw-blade.

The technical term for this "waveform" is "a sawtooth wave".

here is a Wikipedia article detailing the characteristics of sawtooth waves:

https://en.m.wikipedia.org/wiki/Sawtooth_wave

Long story short, the DC amps & watts waveform coming from your battery is in fact nearly always a Sawtooth Wave.

The average amps during one "tooth of the saw" equals "MOTOR amps." (in this case with %50 off-time space in between each "tooth" averaging the 20 "Motor amps" value to 10 "Battery Amps")

",0,2,http://www.electric-skateboard.builders/t/understanding-vesc-the-difference-between-battery-amps-and-motor-amps/15995/17,2017-01-14 03:45:07 UTC

When the switch turns on at the beginning of 1/800th second, does current jump to 20 A instantaneously?

actually no. since "the electrical load" (ie motor) features an iron core (stator) and magnets, it is considered a "inductive load".

if the winding wire were straight, and there were no magnets or steel stator core, the "winding" would be considered a purely "resistive" load.

however, with the presence of magnets and a steel core, we must treat this as an inductive load.

an important aspect of an inductive load is current requires much more time to change. typically, (and in yet another dramatic oversimplification) the mere presence of this inductivity matters much more than the typical actual numerical magnitude of this inductivity.

since current (amps) requires much more time to change with an inductive load, and we are using inductive load for 1/800 of a second, the fact is when the circuit turns on at the start of the 1/800 of a second, The current does not reach 20 A immediately. The 20 amp "motor amp" value is an average over the entire 1/800 of a second. As an average it has minimum, and maximum values, and total time (1/800 of a second). The minimum value is zero at the start of the 1/800 of a second. The maximum value is such that the average of minimum and maximum during the course of the 1/800 of a second equals the averaged 20 "motor amps" value for 1/800 second.

it turns out that when pulsed dc amps is graphed on a chart, the minimum and maximum values of the "on time" combined with on-off duty cycle and fact of inductive load makes the graph resemble the appearance of a Saw-blade.

The technical term for this "waveform" is "a sawtooth wave".

here is a Wikipedia article detailing the characteristics of sawtooth waves:

https://en.m.wikipedia.org/wiki/Sawtooth_wave

Long story short, the DC amps & watts waveform coming from your battery is in fact nearly always a Sawtooth Wave.

The average amps during one "tooth of the saw" equals "MOTOR amps." (in this case with %50 off-time space in between each "tooth" averaging the 20 "Motor amps" value to 10 "Battery Amps")

",0,2,http://www.electric-skateboard.builders/t/understanding-vesc-the-difference-between-battery-amps-and-motor-amps/15995/17,2017-01-14 03:45:07 UTC