Milling machine spindle motor control principle of circuit analysis

The spindle motor control circuit analysis ( 1) The diagram below. ( 2) Principle analysis (1) the main shaft of the starting process analysis of the reversing switch SA1 rotate to the required direction of rotation to start button SB5 or SB6 - contactor KM1 coil electricity - normally open auxiliary contact KM1 ( 6 - 7) Self-locking closed, normally open at the same time the main contact closure - > M1 rotating spindle motor. In the main shaft of starting in tandem with thermal relay control circuit FR1 and normally closed contact of FR2 ( 22 - 23) And ( 23 - 24) 。 That way, when there are any motor overload in the motor M1 and M2, thermal relay normally closed contact of action will lead to two electric motors are stopped. Spindle starting control circuit for: 1 - SA2 - 1→SQ6 - 2→SB1, 1→SB2 - 1→SB5 ( Or SB6) To coil of KM1, KT - 22 - FR2-23 - FR1, 24 (2) the main shaft of parking brake process analysis to press the stop button SB1 and SB2 - > the normally closed contact ( 3 - 4) Or ( 4 - 6) Disconnect and contactor KM1 released by power, but because of inertia in the rotary spindle motor, etc. What should press when press stop button to its normally open contacts ( 109 - 110). Closed and main shaft brake clutch YC1 for coil electricity and to make the spindle brake, quickly stop rotating. (3) the spindle speed impulse process analysis of spindle speed, the speed of the wheel on the variable speed operation pull handle, then turn the variable set, choose good speed will change again after operating handle back. When the process of the shifting handle back to its original position, by mechanical device SQ6 - impulse switch 1 closed again and SQ6 - 2 disconnect. SQ6- 2 ( 2 - 3) Disconnect power - KM1 contactor; SQ6- 1 the instantaneous closure - time relay KT electricity - normally open contacts ( 5 - 7) The instantaneous closure - instantaneous electric contactor KM1 - spindle motor instantaneous rotation, facilitate change gear into the meshing position; At the same time, the time delay relay KT coil electricity to the normally closed contact ( 25 - 22) Delay and disconnect KM1 contactor power, in order to prevent due to operator extend back into the handle time motor drive time is too long, high speed gear speed and produce the phenomenon of broken tooth. The spindle is rotating, the spindle speed without first press stop button to change again. This is because when change lever back to its original position in the process, by mechanical device SQ6 - 2 ( 2 - 3) Off contact, make the contactor KM1 released by coil power, motor M1 stop running. (4) the spindle tool change when braking process analysis in order to make the spindle does not turn during tool change, tool change should be before the spindle brake. Will switch SA2 level to change the cutter location and its contact ( 1 - 2) Disconnect the control circuit of power supply, to ensure the personal safety; Another contact ( 109 - 110). On the spindle brake electromagnetic clutch YC1, make main shaft can not rotate. Back again after tool change will switch SA2 working position to contact SA2 - 1 ( 1 - 2) Closed, the contact SA2 - 2 ( 109 - 110). Disconnect power and main shaft brake clutch YC1, connect the power control circuit.