| 摘要 |
A motor controlling circuit using the handling of a disconnecting switch is provided to protect a contact unit by not exposing an external auxiliary contact and a relay contact for dynamic brake of a motor. A motor controlling circuit using the handling of a disconnecting switch includes a relay controlling unit and a motor driving unit. The relay controlling unit includes a plurality of forward rotation relays and backward rotation relays for forward rotation, backward rotation, and stop of a motor according to open and close handling of the disconnecting switch, and a contact for the relays for self holding in driving the motor. The motor driving unit includes forward rotation relay contacts and backward rotation relay contacts connected to a rotor winding and a field winding of the motor to forward rotate, backward rotate, and stop the motor according to operation of the relays. The motor controlling circuit using the handling of the disconnecting switch further includes first to third rectifiers(D1,D2,D3) to control a current direction in forward rotation, backward rotation, and stop of the motor. |
