Electric hydraulic excavator starting control system and control method

Abstract

The invention discloses an electric hydraulic excavator starting control system and a control method, and relates to the technical field of electric excavators. The electric hydraulic excavator starting control system comprises a wire inlet box, a slide ring box, a starting cabinet , a motor I, a motor II, a human-machine interface and a hydraulic system, wherein a master control unit, a circuit breaker, a fuse I, a fuse II, a soft starter, a contactor I, a contactor II, a contactor III, a contactor IV and a cooling air conditioner are arranged in the starting cabinet; and the circuit breaker,the fuse I, the fuse II, the soft starter, the contactor I, the contactor II, the contactor III, the contactor IV and the cooling air conditioner are connected with the master control unit. Accordingto the system, the single soft starter controls soft starting of the double motors. The electric hydraulic excavator starting control system has the characteristics that the structure is simple, thesystem is efficient and energy-saving, impact-free soft starting is implemented, and power grid fluctuation resistance is high; and meanwhile, a function of direct starting control over the double motors is fulfilled, and the reliability of the system is improved further.

Description

technical field [0001] The invention relates to a starting control system and a control method of an electric hydraulic excavator, belonging to the technical field of electric excavators. Background technique [0002] In recent years, the electro-hydraulic excavator using electric motor to drive the hydraulic system has gradually become a new research direction and hot spot in the excavator field. Traditional electro-hydraulic excavators generally adopt the control method of three-phase asynchronous motor direct full-voltage starting, which has problems such as high energy consumption, large starting current, large starting torque impact, easy to cause grid voltage fluctuations, and weak ability to withstand grid voltage fluctuations. [0003] In order to solve the problem of motor starting, soft starters are widely used in the field of motor drive. The microprocessor performs phase angle trigger control on the thyristor to reduce the voltage applied to the motor, and then s...

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Problems solved by technology

[0004] However, soft start devices are less used in electric hydraulic excavators, and are mostly used in single-motor soft-start systems. At the same time, there is a problem of continuous soft-start overheating, and there is no control system and method for continuous soft-start of dual motors.

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