Intelligent controller applied to motor starting

Abstract

The invention discloses an intelligent controller applied to motor starting. An input terminal of the intelligent controller is connected with an external power supply module, and an output terminal of the intelligent controller is connected with a power supply input end of a control motor. An electronic switch is arranged between the input terminal and the output terminal, and a control signal ina preset form is generated through the control circuit to control the current flowing through the switch tube to be slowly increased when the switch tube is switched on, so that the impact on the motor and the battery caused by overlarge current generated at the moment when the controller is switched on is avoided. Compared with a traditional mechanical contactor controlled by a key switch, the current generated when the motor is started is reduced, the problems of contact arc discharge, contact adhesion and the like generated when the contactor is attracted can be avoided, the impact of thecurrent on the motor and a battery is reduced, and the service life of the battery and the motor is prolonged.

Description

technical field [0001] The invention relates to a control circuit in the electrical field, in particular to an intelligent controller applied to motor starting. Background technique [0002] Controlling the motor start is an important working process of the pallet truck. The existing control start scheme is to control the mechanical contactor through the key switch to switch on or off the main circuit, so as to control the input of the motor to realize the control. Such as figure 1 As shown, in the existing motor starting control scheme, the control signal on the external control signal input terminal 2 of the mechanical contactor 1 triggers the current flowing in the coil of the mechanical contactor to generate an adsorption force, so that the mechanical contactor contact 11 Close and disconnect, so that the input terminal 3 of the mechanical contactor and the output terminal 4 of the mechanical contactor are electrically connected / disconnected, and the input terminal 3 of...

AI Technical Summary

Problems solved by technology

When the contacts of the mechanical contactor are closed to the normal operation of the motor (the current flowing through the contacts or the motor will drop to I load ), will generate a current pulse up to 470 amperes, which will impact the motor and battery and affect the service life of the motor and battery

In addition, the function of the mechanical contactor is relatively simple, and its contacts will cause problems such as arcing, contact adhesion, spring fatigue, and mechanical failure during the switching process of the high-current state, which will affect the starting work of the motor and thus affect the pallet truck. normal work

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