Dual motor control system and engineering equipment

Abstract

The present invention proposes a dual-motor control system and engineering equipment, wherein the dual-motor control system includes a first motor and a second motor, and also includes: a main circuit with multiple phase lines, the first motor is connected through multiple phase lines On the main circuit; the first starting device is connected to the main circuit through multiple phase lines, and the first starting device is connected in series with the first motor; the detection device is used to detect the current or voltage on the main circuit; the controller is connected with the detection The device and the first starting device are respectively connected, wherein, among the multiple phase lines connected to the input terminal of the first starting device, at least two of the multiple phase lines connected to the output terminal of the first starting device are respectively connected to There is a detection device, and the two phase lines connected to the detection device are out of phase; or the detection device is built into the first starting device. Through the technical scheme of the invention, the stability and reliability of the start-up and operation of the dual-motor control system are effectively improved, and the damage of the motors is reduced.

Description

technical field [0001] The invention relates to the technical field of engineering equipment, in particular to a dual-motor control system and engineering equipment. Background technique [0002] The power of the single motor of the crusher supporting the sand making line is relatively large, generally greater than 250 kilowatts, and it operates asynchronously with dual motors, that is, it starts with no load, and the other motor starts after one motor starts normally. [0003] According to the characteristics of the industry, the joint action mode of soft starter + contactor is often used: the soft starter realizes the smooth start of the high-power first motor and the direct start of the second motor. In terms of safety design, both the first motor and the second motor have current detection and can be displayed, and at the same time monitor abnormal states. [0004] But, in the prior art, there are following problems: [0005] 1) The second motor is generally only prote...

AI Technical Summary

Problems solved by technology

[0005] 1) The second motor is generally only protected by a circuit breaker in a single way, and accidents such as damage to the motor may occur after abnormalities such as overload and motor out-of-sync

[0006] 2) After the soft starter starts the motor, switch to bypass (built-in contactor) operation, there is the same risk as the first one

At the same time, there is no monitoring mechanism for abnormal parameters during the starting process of the first motor, such as phase loss and overload

[0007] 3) The parameters during the operation of the first motor can detect single-phase current, and other phase abnormalities such as phase loss and three-phase imbalance cannot be judged in time, and there is an obvious risk of failure

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