SU1164199A1 - Device for controlling multimotor electric drives of crane motion mechanisms - Google Patents

Abstract

A DEVICE FOR CONTROLLING MULTI-MOTOR ELECTRIC DRIVES OF CRANE MOVEMENT MECHANISMS, containing at least one switch, through which the windings of the stators of the asynchronous motors of the movement mechanisms are connected to the alternating voltage source, an anemometer, delay element whose input is connected to the system, and the matrices and the matrices and the systems and the systems have been connected. outputs, where the inputs of the threshold elements are connected to the output of the delay element, and the inverse output of one of the threshold elements is connected to the control to the input of the switch, so that, for the purpose of saving electricity, it is equipped with a key, each of which is connected in series with the stator winding of the electric motor of the corresponding movement mechanism, and the control inputs of the keys are connected to the direct output (L of another threshold element.

Description

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111 The invention relates to lifting equipment, namely, devices for controlling multi-motor electric drives of the crane movement mechanism. The aim of the invention is to save energy when operating multi-motor electric drives of crane movement mechanisms. The drawing shows an electrical diagram of a device for controlling multi-motor electric drives of crane movement mechanisms. A device for controlling multi-motor electric drives of crane movement mechanisms comprises at least one switch I, by means of which the windings of the stators of induction motors 2 and 3 of crane crane mechanisms are connected to an alternating voltage source 4. The anemometer 5 is connected to the input of a delay element 6, the output of which is connected to the inputs of threshold elements 7 and 8. MHBBpcHbrtf the output of element 7 is connected to the control input of switch I. Consistently with. About 692g stator hanks of motors 3 included keys 9, the control inputs of which are connected to the forward output of the threshold element 8. The device operates as follows. In the absence or low value of the wind speed after the acceleration of the crane, the signal at the output of the anemometer 5 is small and at the output of the threshold element 8 the signal is logical zero, the keys 9 are turned off and the engines of the 3 movement mechanisms are turned off. As the wind speed increases, the signal at the threshold of the threshold element 8 becomes equal to the logical unit and the keys 9 connect the previously switched off motors 3 to the source 4. The delay element 6 eliminates the frequent switching of the keys 9 during short wind pulses. Thus, in the steady-state movement of the crane, depending on the wind speed, a different number of engines operate, which reduces power consumption.

Claims (1)

DEVICE FOR CONTROL OF MULTI-MOTOR ELECTRIC DRIVES OF MOBILE MOVEMENTS OF THE CRANE, containing at least one switch, by means of which the windings of the stators of asynchronous motors of the mechanisms of movement are connected to an alternating voltage source, an anemometer, a delay element, the input of which is connected to the anemometer with inlets, and pores moreover, the inputs of the threshold elements are connected to the output of the delay element, and the inverse output of one of the threshold elements is connected to the control at the input of the switch, it is important that, in order to save energy, it is equipped with keys, each of which is connected in series with the stator winding of the electric motor of the corresponding movement mechanism, and the control inputs of the keys are connected to the direct output of the other threshold element. SU ,,,, 1164199 i 1 11641