Online soft-start device of motor

Abstract

The invention provides an online soft-start device of a motor. The device comprises a housing body, a display arranged on the housing body, a main controller and a power driver, wherein the main controller is arranged in the housing body and is in communication connection with the display, and the power driver is arranged on the housing body and connected with the motor. The device is characterized in that the device comprises a main control CPU, a driving generator and a triggering driver connected with the main control CPU and the driving generator; the triggering driver is connected with adriving output device; the driving output device is connected with the power driver, a default phase detector, a zero-passing detector and an overcurrent detector, wherein the default phase detector,the zero-passing detector and the overcurrent detector are connected with the main control CPU and the driving generator, and connected with the three-phase alternating current input end of the powerdriver. A triggering controller is connected with the main control CPU and the triggering driver. According to the invention, starting and stopping of soft start, the whole soft start processes, the default phase, zero-passing and/or overcurrent, temperature, voltage and current can be monitored; safety of the motor is ensured; and the device supports network communication of a mobile phone, an IPAD and a MODBUS.

Description

technical field [0001] The invention relates to a soft start device, in particular to an online soft start device for a motor based on the Internet of Things, and belongs to the technical field of electric start devices. Background technique [0002] Asynchronous motors are widely used in various industries due to their excellent performance and maintenance-free features. However, due to the traditional starting method, the AC380 full voltage is applied to the motor when starting, and the motor will accelerate from zero to rated speed in an instant, causing the starting current to reach 5-8 times the rated current of the motor. Large, it will reduce the service life of the load equipment, and at the same time constitute a fatal impact on the entire power grid system, lines, and protection equipment. For this reason, the relevant state departments have clearly stipulated that the power grid voltage drop cannot exceed 15% when the motor is started. There are two solutions fo...

AI Technical Summary

Problems solved by technology

However, the traditional soft starter uses external parallel contactors to start, and only participates in the drive and control of the motor during the start and stop process. After the start, the soft starter controls the external contactor to pull in. The starter is bypassed by the external contactor, so it cannot participate in the operation of the motor in the whole process. If the power supply phase loss, overheating, overcurrent, overload, motor stall, motor burnout and other accidents occur at this time, the soft starter cannot respond immediately. allowing faults to occur and spread

In addition, since the bypass contactor is a mechanical device and uses mechanical contacts to work, it cannot operate reliably for a long time in harsh working environments such as high dust and high salt spray

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