JPH0440093U - - Google Patents

Description

[Brief explanation of the drawing]

Fig. 1 is a circuit diagram showing an embodiment of the present invention, Fig. 2 is a configuration diagram showing an inverter hoist of the embodiment, Fig. 3 is a characteristic diagram showing speed control characteristics, and Fig. 4 shows a conventional inverter hoist. FIG. In the drawing, 2 is the hoist body, 3 is a control box, 5 is a hand-operated push button, 5a is an up button, 5b is a down button,
8 is a hoisting motor, 11 is an inverter, 12 is a load cell, 13 is a converter, and 14 is a control circuit.

Claims (1)

[Claims for Utility Model Registration] An inverter capable of changing the frequency of output alternating current; and an inverter that is supplied with alternating current from the inverter and driven to rotate at a rotational speed corresponding to the frequency of the alternating current for hoisting and unwinding. An electric motor that operates, a hand-operated push button section with a two-stage action push button type up and down button, a load sensor that detects the load of the suspended cargo, and a low speed when the up button is pushed into the first stage. The inverter output frequency is specified so that hoisting is performed, and the inverter output frequency is specified so that when the up button is pushed to the second stage, the hoisting speed changes in inverse proportion to the load detected by the load sensor. At the same time, the output frequency of the inverter is specified so that when the down button is pushed to the first stage, lowering is performed at a low speed, and when the down button is pushed to the second stage, the winding is performed in inverse proportion to the load detected by the load sensor. An inverter hoist comprising: a control circuit that regulates the output frequency of the inverter so that the lower speed changes;