If the power supply voltage Ee falls, the terminal voltage Um of the motor drops when the load torque does not change. At this time, since the voltage across R5 has not changed, the VT1 emitter voltage will not change. As the power supply voltage drops, the VT1 base voltage also decreases. Thus, the forward bias of the VT1 emitter rises, the collector currents of VT1 and VT2 increase simultaneously, and the collector voltage of VT2 drops, so that the voltage on R5 also drops, which causes the voltage at the motor terminal to rise and maintain the motor speed unchanged. DC motor electronic steady speed schematic:
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