Three-phase asynchronous motorThe control circuit is mainly composed of the main circuit and the control circuit, the main circuit refers to the part of the motor and the power supply link circuit, because of its large working current, depends on the capacity of the motor; The control circuit refers to the part of the circuit composed of the control appliance, and the working current is relatively small.

       Point control refers to the needThree-phase asynchronous motorFor short intermittent work, as long as the button is pressed, the motor will turn, and if the button is released, the motor will stop. You can see the following figure to understand:

       When working, the first thing is to close the isolation switch (QS), after switching on the three-phase power supply, press the start button (SB), when the contactor coil (KMThe three main contacts in the main circuit (KM) Close, power on, motor rotation; Release the start button (SB), when the contact coil (KM) will lose power, then the corresponding main contact (KMIt will also disconnect, at which time the motor will stop rotating. In the pictureFU1,FU2The fuses are respectively used as short-circuit protection for the main circuit and the control circuit.

       To summarize: the power switch in the main circuit (QS) Play the role of isolating the power supply; Fuse (FU1Short-circuit protection of the main circuit; The main circuit is switched on and off by the contactor (KM) the three-phase main contact is completed; Because of the point control,Three-phase asynchronous motorThe running time is short, so no overload protection is set; Fuse in control circuitFU2) Do short circuit protection; Normally open button (SBTo control (KMThe solenoid is on and off.

       The above content is composed ofThree-phase asynchronous motor manufacturersMori machineProvided, interested in this or want to know about our products can consult online message or call directly0575-8378-1127.