The Effect of Motor Loading:

DC electric motors, such as the EG1000 motor, do not provide the same output RPM under all conditions. Instead, output RPM is linearly proportional to the torque load it sees. As the torque load increases, such as with a stronger main spring or heavier piston, the motor output speed will decrease. Even though the maximum given speed of the EG1000 motor is given at 27552, this is the “no-load” speed, meaning the motor only achieves this rate of rotation when it freely rotates without a torque load. Since even the weakest piston and spring combination will add some load, the maximum 27552 rate of rotation is never attained. To determine the actual output RPM of a motor under a given load, the motor's torque/speed curve must be consulted. Fortunately, this curve is linear for DC motors, and can be easily determined from a motor's rated maximum RPM and torque output. The X intercept of the plot is the maximum torque rating while the Y intercept is the maximum rated RPM. Again using published* ratings for the EG1000 motor, we get the following torque/speed curve:



One caveat of note here is that motor torque/speed curves must be qualified with a specific rated input voltage, since an increase in supply voltage to a DC motor will result in a change in its characteristics. Unfortunately, the specifics of AEG motors are hard to obtain, including the rated voltage attached to the curve above.

*Motor ratings for the EG1000 motor were obtained from a technical post at FilAirsoft.com The original source of these published numbers were from a printed Systema ad in an issue of ARMS magazine circulated in Japan. Because the source of these numbers is a party with vested interest in their interpretation, it must not be presumed to be 100% accurate.