If need be willThree-phase asynchronous motorTo achieve positive and negative rotation control, just swap any two phases in the phase sequence of its power supply, here we call it commutation.
Generally speakingVNot moving, by switchingUwithWTo achieve, in order to ensure that the phase sequence can be switched when the two contactors operate, the interface on the contactor should be kept constant when wiring, and phase modulation can be performed at the lower port of the contactor. The following Senli motor Xiaobian for everyone to introduceThree-phase asynchronous motorThe forward start process, stop process and reverse start process.
Forward starting procedureYou can press the start buttonSB2contactorKM1The coil is energized, withSB2shunt-woundKM1The auxiliary normally open contact is closed to ensureKM1The coils are continuously energized and in series in the motor circuitKM1The main contact is continuously closed, and the motor is continuously running forward.
Stop processYou can press the stop buttonSB1contactorKM1Coil power off, withSB2shunt-woundKM1The auxiliary contact is disconnected to ensureKM1Coil continuous loss of power, series in the motor circuitKM1The main contact is continuously disconnected, cutting off the motor stator power supply, and the motor stops running.
Reverse starting procedure,The start button can be pressedSB3contactorKM2The coil is energized, withSB3shunt-woundKM2The auxiliary normally open contact is closed to ensureKM2The coils are continuously energized and in series in the motor circuitKM2The main contact is continuously closed, and the motor continuously runs in reverse.
Three-phase asynchronous motor manufacturersReminder: In the positive and negative control operation, if the error makes the positive conversion electromagnetic contactor and the reverse electromagnetic contactor operate at the same time, then a closed circuit will be formed, then the three-phase power supplyL1In step with each otherL3The voltage between the lines of the phase will form a completely short-circuit state by reversing the main contact of the electromagnetic contactor, at which time there will be a large short-circuit current flowing and burning the circuit. Therefore, in order to prevent the two-phase power short circuit accident, the contactorKM1andKM2The main contacts must not be closed at the same time.
Shengzhou Senli MotorisThree-phase asynchronous motor manufacturers, supplied3KWAnd the following small power motor. If you want to know more about this type of motor or are interested in learning about our products, please leave a message online or call us directly0575-8378-1127.