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1. Overview

The traditional solution of using a frequency inverter to drive an asynchronous motor in mining belt conveyors has several shortcomings, such as poor driving stability, low transmission efficiency, unbalanced power distribution between the master and slave units, and high energy consumption. With the rapid development of permanent magnet direct - drive technology and frequency conversion technology, the ore transportation solution now offers higher efficiency, lower power consumption, better reliability, longer transmission distance, and stronger multi - machine master - slave synchronization performance. This article introduces the application solution of the Yolico YDS8000 series frequency inverters for power balance in the permanent magnet direct - drive system of coal mine belt conveyor equipment.

2. Solution

The motor model is an external - rotor roller integrated permanent magnet synchronous motor (14.67hz/44rpm, 240A), and the frequency inverter model is YDS8160 T4N.

Introduction to the equipment process:
Figure 1: Schematic diagram of the belt conveyor

There are two frequency inverters, which control Motor 1 and Motor 2 respectively.
The control modes of the two motors are master speed control and slave torque control respectively. They are connected via analog signals.
The master motor sends two analog instruction, a speed instruction and a torque instruction to the slave station. To achieve synchronous performance, the speed variation rate is required within 5%.

On-site commissioning photos of the belt conveyor

The process of factory installation and commissioning

3. Conclusion

(1) The belt and the roller run smoothly during the transportation, the operating current of the frequency inverter remains stable at around 240A.

(2) The frequency inverter is not be interfered during the switching process while cooperating with the operation bypass function of the system’s power frequency.

(3) The frequency inverter can be started when the belt is fully loaded and the current is around 360A at startup moment.

(4) The interface between the frequency inverter and the controller, as well as the communication and monitoring act normally without any interference or disconnection phenomena.

(5) During the startup and stop processes, the belt moves smoothly without any slipping or roller vibration.