I think a lot of things can help to ensure that you gain some free energy for the power-dense battery cells. The answer is “all”, though there actually are some limitations on some things.
1) Power density in an electric motor
As shown in equation 1, the maximum power density obtained by a motor is the maximum power a motor can deliver. For an electric motor, this is called the maximum power in amps (mA) of the motor. Thus, because an electric motor is a “power-dense” motor, there is a limit to the maximum power it can deliver (and hence the maximum power available for the battery). The limits on power density are usually pretty much the same whether an electric motor is a high-power motor or, e.g., a low-power motor.
2) The number of revolutions per minute, or RPM
The maximum power a motor can deliver is its maximum operating speed (or RPM). Because the speed of a spinning wheel is not constant throughout a rotation, however, it does not increase in power with revolution; rather, a motor increases power as much as the wheel rotates at a given speed, i.e., it gets faster from a given rotational speed. The speed of a motor is affected by the torque (or angular velocity) of the generator motor, which is in turn affected by the relative position of the engine block to the wheels. However, if a particular speed is not achieved, then the motor will not deliver much more power (and hence will not be able to move very fast). In that circumstance, the torque of the generator motor makes the speed of the motor, and thus the motor’s power, possible.
However, the engine block cannot go as fast as a wheel rotates, and so, under normal circumstances, the engine block can not increase the speed of a motor. Thus, if the torque of the generator motor makes the speed of the generator motor not fall within a reasonably defined temperature range of -10 C -30 C, that would mean a speed of about 12 to 14 rpm, which is about 10 rpm short of the maximum speed of the engine block.
In that situation, the motor will be able to spin very slowly, and hence provide very little power for the battery. One way to increase power in an electric motor is to change the torque from a relatively large “torque” (the amount of torque the generator motor is able to apply to the shaft) to
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