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Another way to reduce inrush currents during motor startup, is starting the motor in series with resistors. In case of a DC motor, resistors can be placed in the positive voltage supply with bypass contacts after every resistor. When the motor is started, its connected in series with the resistors. This means the supplied voltage and current to the motor is lower. After a certain time, the first resistor is bypassed and so the resistance in front of the motor is lowered. As a result, the voltage to the motor increases and so is the power which means the motor rotates faster. This keeps on going until the last resistor is bypassed and the full positive voltage is supplied to the motor.
In the simulated circuit, only press the switch on the left side, the circuit will do the rest. The startup sequence of the motor will be fully automatic. Watch the voltage and current of the motor during its startup sequence.
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