1、 Introduction to SPFD System for Belt Conveyor

1) Introduction to Intelligent Permanent Magnet Variable Frequency Direct Drive System for Belt Conveyor

The Intelligent Permanent Magnet Variable Frequency Direct Drive System (SPFD) is a new type of belt conveyor drive system product independently developed and produced by Jiangsu Aerospace, with permanent magnet variable frequency technology as the core. Compared with traditional devices, the permanent magnet variable frequency direct drive system has many advantages such as low speed, high torque, high transmission efficiency, smooth operation, compact structure, and small space occupation. It is suitable for working in various harsh working conditions and is currently the ideal drive system for belt conveyors.

2) Composition of intelligent permanent magnet variable frequency direct drive system for belt conveyor

The permanent magnet variable frequency direct drive system consists of a permanent magnet variable frequency direct drive motor, a dedicated intelligent variable frequency control system, a system control device, and a cooling system.

① The permanent magnet variable frequency motor directly drives the motor output torque through a dedicated intelligent variable frequency control to achieve soft start of the belt conveyor, achieving torque balance of multiple motor drives for the belt conveyor. The system has the prominent feature of low-speed and high torque, which well meets the needs of smooth and heavy load starting of belt conveyors. No gearbox, simplified transmission chain, effectively reducing maintenance costs.

② The system control device, permanent magnet variable frequency direct drive system control device, adopts a dedicated control box for control. The control box centrally controls various equipment in the system (including permanent magnet motors, dedicated intelligent frequency converters and their cooling systems), and collects and processes various information in the system (temperature of permanent magnet motor stator and bearings, temperature, pressure, humidity of each cooling system, etc.) to provide real-time protection for the system. At the same time, the control box reserves multiple communication interfaces, supporting Ethernet, Modbus, Profibus, and remote I/O.

③ The cooling system is an independent external circulation air-cooled cooling system developed and designed for use in permanent magnet variable frequency direct drive motors and dedicated intelligent controllers. It is an important component of the entire SPFD permanent magnet variable frequency direct drive system.

3) Characteristics of Intelligent Permanent Magnet Variable Frequency Direct Drive System for Belt Conveyor

safe and reliable

·No deceleration system, direct drive, smoother system operation, less vibration, lower noise, and improved reliability;

·Variable frequency starting, variable frequency speed regulation, reducing the impact on tape and equipment;

·Good controllability, multiple drive power balance of belt conveyor can be achieved through frequency conversion control;

·The frequency converter distribution resistor and filtering device will not impact the power grid and interfere with other equipment;

maintenance-free

·No deceleration system and associated hydraulic system, reducing maintenance and cost;

Energy-efficient

·No deceleration system, mechanical efficiency 100%.

Intelligent control

·The system has zero speed full torque output characteristics to achieve heavy-duty starting;

·Equipped with low-speed belt verification function;

·Direct torque control, dual closed-loop (speed loop, current loop) regulation, achieving multi drive balance;

·Variable frequency control enables the "S" curve starting and stopping of the belt conveyor, and can adjust the speed of the belt according to the load;

4) Comparison between permanent magnet variable frequency direct drive system and traditional drive system

2、 Selection of SPFD system for belt conveyor

1) Selection instructions

① According to the user's on-site usage environment and voltage level requirements, the SPFD system driven by belt conveyors can be divided into the following four basic series:

② To meet users' requirements for different external dimensions, permanent magnet motors are available in three different machine base sizes: S, M, and L.

③ In addition to the basic base size, Jiangsu Aerospace Company's SPFD system provides specialized and personalized customization to meet different transportation and installation requirements as well as on-site usage conditions.

1) Selection instructions

① Selection of permanent magnet variable frequency motor

Determine the motor speed

Based on the calculated motor speed, select a motor rated speed that is close to it. The standard speeds are 60, 75, 90, and 120 r/min. If there is no speed close to it, please contact the Jiangsu Aerospace Technology Department.

Determine the motor model

When the actual speed is lower than the rated speed of the motor, select the motor according to the required torque; When the actual speed is higher than the rated speed of the motor, select the motor according to the required power. In any case, it is necessary to ensure that the motor has sufficient torque within the speed range.

Determine cooling and installation methods

The main series adopts a horizontal installation method. If you need other installation methods such as cooling systems, please contact the Jiangsu Aerospace Technology Department.

2) Ordering Information for Permanent Magnet Variable Frequency Motors

② Ordering parameters for permanent magnet variable frequency motor

Permanent magnet motors are divided into explosion-proof TBVF series and non explosion-proof TPTYC series.

3、 Selection of dedicated frequency converter

BP series universal frequency converter cabinet

BPJ1 series mining explosion-proof and intrinsic safety AC frequency converter

Introduction to SPFD dedicated frequency converter

SPFD dedicated frequency converter is the latest permanent magnet direct drive system dedicated frequency converter developed and produced by our company. It introduces foreign core control technology and adopts direct torque control/sensorless vector control, which can achieve precise torque control without an encoder. SPFD dedicated frequency converters have the characteristics of high efficiency, superior electromagnetic compatibility, and strong environmental adaptability, which can minimize interference with the power grid and surrounding equipment and fully meet various working conditions.

Selection of dedicated frequency converter

① Voltage matching

Choose the same power supply voltage level as the motor. The SPFD dedicated frequency converter has three voltage levels to choose from: 380V, 660V, and 1140V.

② Power matching

Inverter power ≥ 1.12 times motor power

Note: The frequency converter is designed for the working conditions of the belt conveyor, meeting the requirements of 1.5 times overload for 1min/10min and 2 times overload for 10s/10min.

③ Energy feedback (optional)

The SPFD dedicated frequency converter is of the ordinary type (two quadrant) and the energy feedback type (four quadrant). Generally, the ordinary type is selected and does not need to be specified. In working conditions with energy feedback (such as the operating conditions of a belt conveyor), the energy feedback type frequency converter should be selected.

Note: Energy feedback type frequency converters need to be compatible with corresponding models of mining explosion-proof reactors and mining explosion-proof filter reactors.

④ Inverter ordering information

When placing an order, please select the most suitable model of frequency converter (frequency converter cabinet) according to the above selection method. If the specifications you need are not listed in the table, you can call Jiangsu Aerospace Company for specific consultation. You should provide at least the following information when placing an order.

·Full models and names of SPFD dedicated frequency converters;

·Operating conditions;

·Order quantity.

BP series universal frequency converter cabinet selection table

Note: This selection table is only applicable to TPTYC series three-phase variable frequency speed regulation permanent magnet synchronous motors

BPJ1 series mining explosion-proof and intrinsic safety AC frequency converter selection table

Note: This selection table is only applicable to TBVF series mining explosion-proof three-phase permanent magnet synchronous variable frequency motors

BPJ1 series mining explosion-proof and intrinsic safety AC frequency converter selection table

Note: This selection table is only applicable to TPTYC series three-phase variable frequency speed regulation permanent magnet synchronous motors under energy feedback conditions

DKB1 Series Mining Explosion proof Filter Reactor/Mining Explosion proof Reactor Selection Table

4、 System control device

Overview

The SPFD control system adopts a dedicated control box for control, which centrally controls various devices in the system (mainly including permanent magnet motors, frequency converters, and their cooling systems), and collects and processes signals from various devices in the system (mainly including stator and bearing temperature of permanent magnet motors, temperature, pressure, flow rate, etc. of permanent magnet motors and frequency converter cooling systems) to provide real-time protection for the system. Users only need to give start and stop commands based on the feedback signal from the control box. The control box automatically starts and stops the corresponding equipment according to the program, monitors and protects the system in real time, and outputs the system status. It can greatly facilitate users to use the SPFD system, reduce workload, and quickly connect. At the same time, the control box reserves multiple communication interfaces and supports multiple networks, including industrial Ethernet, Modbus, Profibus, and remote I/O.

The core components of the control box consist of a touch screen and a programmable logic controller (PLC). PLC is mainly responsible for the interlocking control of the entire system. All kinds of interlocking protection signals and equipment status signals on site are introduced into the PLC input point, and the PLC outputs signals to start and stop the on-site equipment based on the logical operation instructions. The system status and parameters are displayed in real-time through the touch screen, making it convenient for users to understand the system status in a timely manner.

Control mode of control box

The control box has three control modes: remote control, manual control, and locking:

① Remote control: This system receives control instructions from remote signals such as the main control of the belt conveyor, and automatically starts and stops all equipment according to the program.

② Manual: mainly used in the equipment debugging stage, and can also be used as an emergency measure for temporary production. All equipment is started and stopped by buttons on the control box.

③ Lockout: Do not start.