Control system for electric motors for crane drive, electric motor for crane drive, and conveying crane.

Abstract

To prevent malfunction of a crane driving electromotor when a crank handle of a master controller is in the "0 notch" instructing the stop of a conveyance crane.SOLUTION: In a control system 10 for a crane driving electromotor, a master controller 1 has 0 notch position detection means 11 detecting that a crank handle 12 is in a 0 notch position. An operation circuit 3 includes contactor ON-state detection means 32 detecting that a direction switching contactor 22 or an acceleration contactor 21 is in an ON-state in a main circuit 2, a closing contact 33 when detecting the 0 notch position that is a contact operated to be closed when the 0 notch position detection means 11 detects that the crank handle 12 is in the 0 notch position, and contact closing detection means 34 that is connected to the closing contact 33 when detecting the 0 notch position to detect that a signal corresponding to any one of notches other than the 0 notch is input in the contactor.SELECTED DRAWING: Figure 1

Claims

1. A master controller that controls the electric motor for driving the transport crane by operating a crank handle, A main circuit having a contactor that controls the rotational speed of the drive motor, An operating circuit for operating the opening and closing of the contactor, Equipped with, A control system for an electric motor used to drive a crane, The master controller has a zero-notch position detection means for detecting when the crank handle is in the zero-notch position, The aforementioned operating circuit is The main circuit includes a contactor ON state detection means for detecting whether a direction switching contactor or an acceleration contactor is in the ON state, The zero-notch position detection means includes a zero-notch position detection closing contact, which is a contact that closes when the crank handle detects that it is in the zero-notch position, A contact closing detection means connected to the zero-notch position closing contact, which detects when a signal corresponding to any notch other than zero-notch is input to the contactor, Having, Control system for electric motors used to drive cranes.

2. When the contact closing detection means detects that a signal corresponding to any notch other than the zero notch has been input to the contactor, the main power supply to the drive motor is cut off. A control system for a crane drive motor according to claim 1.

3. A control system for a crane drive motor according to claim 1 or 2, comprising Electric motor for driving cranes.

4. A motor for driving a crane as described in claim 3, A crane for transporting goods.

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