1
With the rapid development and development of technologies such as motors, home electronics, computers, and communications, the demand for permanent magnet materials is increasing and the performance is getting higher and higher. At present, most of the permanent magnet materials are NdFeB, ferrite, AlNiCo, SmCo, etc., and have the characteristics of large coercive force and stable performance. These materials are subjected to high voltage and high current of the magnetizing power supply to the solenoid. The pulse is discharged to magnetize it. The production of magnetic charging power is required to be efficient, stable, and high precision. At the same time, the magnetic flux of the permanent magnet material after magnetization is tested. In this paper, the magnetization and measurement are integrated into a high-efficiency automatic magnetizing machine. The system control is realized by using plc, and the touch screen is used as parameter adjustment and work display.
2 electromagnetic exchange
The magnetizer generates a strong magnetic field according to the capacitor energy storage pulse discharge, and magnetizes the ferromagnetic material [1]. Before the electromagnetic exchange, the energy stored by the capacitor 
Where l is the inductance of the solenoid in the magnetizing head, r is the sum of the solenoid, the discharge loop connection wire resistance, the contact resistance and the internal resistance of the discharge device (ignoring the line distribution capacitance and the distributed inductance).
For pulse magnetization, the magnetizing head is often used
3 control system design
Figure 2 is a schematic diagram of a magnetizer system. The circuit is composed of an adjustable DC high voltage power supply, a discharge switch circuit, a plc controller, a touch screen, a magnetic flux detection and a magnetizing head. Control requirements:
1 Adjust the thyristor control angle to adjust the magnetizing current;
2 automatically detecting the magnetic flux strength of the magnetized product;
3 man-machine dialogue, that is, setting parameters and displaying the running status;
4 plc real system control and operation;
5 overcurrent and overvoltage protection of power components;
6 With input short circuit protection, safe operation.
3.1 Magnetizing circuit
The magnetizing circuit has a main circuit and a trigger circuit. The circuit diagram of the magnetizer is shown in Figure 3. The main circuit is mainly composed of circuits such as AC voltage regulation and boosting, rectification energy storage and discharge. The input voltage of the step-up transformer t is adjusted by adjusting the phase shift angle (or conduction angle) of the triacs vt1 and tv2, and then the pulsating DC voltage is obtained by the bridge rectifier circuit, and the electric energy is stored in the capacitor group cl. When the thyristor vt7 is turned on, it instantaneously generates a strong pulse current discharge to the charging head to rapidly magnetize the material. In the two-way thyristor synchronous phase-controlled trigger circuit, the output voltage vout of the analog module fx0n-3a controls the conduction angle to adjust the upper voltage of the storage capacitor [2, 3, 4].
Kassel brushless Servo Motor can be used in robotics, large-scale presses, forging equipment, food production, machinery and other industries.
Technical features:
1. Stable performance and high control precision
2. High temperature resistance, dustproof and waterproof
3. Embedded structure, 3 times overload capacity
4. The body is beautiful and smooth without burrs
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Kassel Machinery (zhejiang) Co., Ltd. , https://www.kasselservo.com