The forward rotation control of the asynchronous motor, the peers of the double contactor and the button are doing more, but is there anyone who will use an AC contactor to achieve the forward rotation control effect of the motor?
Practical application: Generally, the bench drill is trusted to be used by peers, and he is modified and added a function to become an active tapping machine. Device, starter, original three-phase button self-locking or three-phase knob switch one, contactor CJ10-20, travel switch two, LAX series can be. Why is the contactor so big? I'm going to use the secondary normally closed contacts on the left and right of it as the main contacts. The main circuit, after the three-phase switch, L2 directly into the motor, L1, L2 connected to the left and right main contacts of the contactor, cross split to the left and right auxiliary normally closed contacts. The motor wire, the U connection to the left and left normally closed contacts of the lower end of the contactor, and the auxiliary normally closed to the right and right of the lower end of the main contact of the W contactor. V is directly connected to L2 without contactor control. Weld a touch rod that may tap an 8 mm screw as a travel switch on the dial of the bench drill, fix two travel switches on the edge of the dial, one travel switch when starting, and one travel switch when stopping.
Working principle: the knob switch is closed, the contactor does not move, the power supply enters the motor, and the other two phases also enter the motor through the auxiliary normally closed contacts on the left and right, and the motor rotates. Press the table drill feed handle, the spindle moves down the dial together, and when it reaches a certain direction, the touch rod on the dial pushes the travel switch, the contactor is engaged, the auxiliary normally closed disconnection, the main contact is closed, the phase sequence is exchanged, and the motor is energized and rotated. The dial rotates upwards from the main shaft, the bumper pushes the second travel switch, the contactor is powered off, and the motor rotates forward.
When manual transmission, as long as the feed handle and dial are completely relaxed, so that he does not follow the movement of the spindle and does not touch the two travel switches.
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