Brake system and method for power & free control

Abstract

The invention belongs to the technical field of logistics and relates to a brake system and method for power & free control. The system includes a driver and a controller; the driver is used for outputting corresponding driving current to a motor according to received pulse width modulation signals; the controller is used for outputting the pulse width modulation signals to the driver; the controller includes a deceleration module for controlling the deceleration operation of the motor, and a brake module for controlling the brake of the motor; when receiving external brake signals, the controller first controls a motor rotor to perform deceleration operation for a preset number of turns through the deceleration module, and then controls a motor brake to be at a locking position through the brake module; when receiving photoelectric signals, the controller controls the motor to perform deceleration operation at first, and then locks the position to realize braking after the rotation speed of the motor which runs at a high speed is decreased; and therefore, the positioning accuracy of the whole system can be increased, and high-speed power & free operation control requirements can be met.

Description

technical field [0001] The invention belongs to the technical field of logistics, and in particular relates to a braking system and method for accumulation control. Background technique [0002] The daily flow of goods handled by e-commerce and logistics companies is increasing, and the requirements for the speed of conveyor lines are getting higher and higher. At present, the conveying speed of domestic and foreign logistics accumulating conveying lines is mostly below 70m / min, which is increasingly unable to meet the increasing flow conveying requirements. The braking force of the small-power DC servo motor is limited. When the weight of the transported goods is greater than 30kg, the volume is small, and the conveying speed is greater than 70m / min, the braking distance required for the goods from running to stopping is greater than 300mm, which exceeds the allowable length of the goods. If the braking distance is too long, the goods cannot accurately stay at the designat...

AI Technical Summary

Problems solved by technology

However, when the weight of the cargo is greater than 30Kg and the transportation speed is greater than 70m / min, the impact of the inertia of the cargo and the reverse electromotive force (up to twice the bus voltage, which may cause damage to the power supply) will give Braking distance and system stability are affected

Therefore, it is required not only to eliminate the interference of inertia and back EMF, but also to make the system brake smoothly and quickly, which is difficult to achieve with ordinary control methods.

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