Mining explosion-proof and intrinsically safe variable frequency permanent magnet drive system

Introduction to all-in-one machine

Taking advantage of the low-speed and high torque of permanent magnet motor, combined with the torque amplification function of planetary reducer and the control of frequency converter, the low-speed drive all-in-one machine has the smallest volume and the best performance. It is suitable for installation space limited and movable equipment.

The voltage source motor control mode is adopted. After the power frequency 50Hz current passes through the rectifier, the three-phase inverter supplies power to the three-phase winding of the motor. The rotating magnetic field synthesized by the three-phase symmetrical current interacts with the magnetic field generated by the rotor permanent magnet to generate torque, and drives the rotor to rotate at the synchronous speed of n = 60F / P.

Introduction to control box

The control box is composed of PLC, intrinsically safe power supply, switching power supply, relay, display screen, button, shell, etc. It mainly completes the collection of the state and parameters of the integrated machine of variable frequency motor, the isolation of intrinsically safe and non intrinsically safe signals, the logic operation inside the programmable controller, output control and communication with the upper computer. The control box and the variable frequency motor form a terminal drive system, which realizes the integrated debugging, control and display of the variable frequency motor by the control box, which is convenient for debugging and viewing the integrated machine.

Product features of all-in-one machine
1. Proprietary waterway structure
2. With independent flameproof chamber
3. The stator coil is a shaped coil with high-voltage structure
4. The rotor adopts built-in tangential magnetic circuit structure
5. Permanent magnet materials with high temperature resistance and high performance
6. The shaft is made of high-strength alloy steel
7. Inverter rectifier and inverter adopt modular structure, which is convenient for on-site maintenance
8. The control box is equipped with Chinese LCD, which can display system graphics, operation parameters, fault information and historical record query; Various settings and operations can be completed through the screen
9. It has the function of automatic parameter storage. After the main power supply is powered off and restored, the original set parameters of the frequency converter remain unchanged, and has the function of fault recording. The storage capacity is not less than 100
10. Equipped with cable connector at inlet and outlet side
11. It has high starting torque, and the maximum starting torque is greater than 220%; The controllable torque is greater than 125% at low frequency; Maximum overload 250%; Overload current 1.2ict (long-term continuous operation); Overload current 1.5ict (2 minutes); Overload current 2ict (1 minute); Torque response time less than 10 ms
12. The total harmonic content generated by the frequency converter is less than 3%
Excellent motor control mode has high-efficiency and energy-saving design. It also has optional output Du / dt and sine wave filter, so that the power factor is more than 0.95 and its own efficiency can reach more than 98%