The process from when the explosion proof low voltage motor is connected to the power supply and the rotor starts to rotate to stable operation is called startup. At the moment of startup, n=0→s=1→E maximum →Ist maximum.
The starting characteristics of explosion proof low voltage motor:
Excessive starting current causes voltage drop and insufficient starting torque, making it impossible for the motor to start at all.
2. A large starting current causes the motor windings to heat up, insulation to age, and shortens the service life of the motor.
3. It causes the overcurrent protection device to malfunction and trip.
4. It causes voltage fluctuations in the power grid, which will affect the normal operation of other equipment connected to the power grid.
The startup method of explosion proof low voltage motor:
1. Full-voltage starting (Direct starting)
Full-voltage starting is a starting method that directly connects the explosion proof low voltage motor to the rated voltage, also known as direct starting. The voltage applied to the stator winding of the explosion proof low voltage motor at startup is the rated voltage of the motor.
Advantages: Simple equipment, convenient operation, and short start-up time.
Disadvantage: The starting current is relatively large, which will cause the line voltage to drop and affect the normal operation of the load.
Scope of application: Motor capacity below 10KW.
Ii. Reduced-voltage starting
The starting process involves using a starting device to appropriately reduce the voltage and then applying it to the stator windings of the motor. After the motor starts running, the voltage is restored to the rated voltage for normal operation. This method is generally only applicable to the no-load or light-load starting of electric motors. The methods include:
1. The stator is started by reducing the voltage through a resistor or reactor in series.
2.Y/△ reduced-voltage start-up.
3. Stator series autotransformer reduced-voltage starting.
4. Extended triangle reduced-voltage starting.
explosion proof low voltage motor https://www.juyueenergy.com/Low-voltage-motor
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