The entire motor machine system is “visible” in the motor voltages and currents
As this illustration shows, all three elements of a motor/machine system are interrelated and impact each other. For example, electrical frequency (1) determines motor speed, and motor speed (2) determines load. So a load variance or imblance may not be due to the motor, but rather to an issue with electrical frequency.
Since torque required (3) is determined by load speed (2), insufficient problem can be caused by motor speed (2) or electrical frequency (1). And because torque required (3) determines power required (4), this can impact the voltage (5) available from the power system. The power required determines the current (6) required at the supplied voltage level.
The entire motor machine system is “visible” in the motor voltages and currents.