The magnetization and measuring - efficient automatic charger system design

1 introduction

as machinery, household electronics, computer and communication technologies such as rapid updates and development, growing more and more high performance permanent magnetic material requirements. USES mostly at present, the permanent magnet ndfeb, ferrite, alnico, samarium cobalt, etc, and has the characteristic such as high coercive force, stable performance, these materials via high pressure of magnetization of the power of large electrical flow solenoid instantaneous pulse discharge, make its magnetization. Magnetization power requirements in the production of high efficiency, stability, high precision, at the same time, the test after magnetization of permanent magnet magnetic flux in the machine. This paper introduces the magnetization and measurement of high efficient automatic charger, using PLC controller to realize the control system, touch screen as a parameter adjustment, display etc. 2 electromagnetic exchange

magnetizing apparatus based on capacitive energy-storage develop a strong magnetic field, pulse discharge magnetized ferromagnetic material. In front of the electromagnetic exchange, capacitor stored energy

type of l for magnetizing inductance of solenoid, r for solenoid, discharge circuit connecting wire resistance and contact resistance and the sum of discharge device resistance ( Ignore the line distribution distributed capacitance and inductance) 。

of pulse magnetization, the magnetization head often choose

3 control system design in figure 2 for magnetizing apparatus system schematic diagram. Circuit is composed of adjustable dc power supply, high discharge switch circuit, PLC controllers, touch screen, magnetic flux detection and magnetization of the first circuit. Control requirements:

(1) to adjust the magnetization current thyristor control Angle to adjust;

magnetization product magnetic flux intensity; (2) automatic detection

(3) the man-machine dialogue, namely the set parameters and display of running status;

4) PLC controller control and the real operation;

5. Power components of over-current and over-voltage protection;

6 with input short circuit protection, safe in operation.

3。 The magnetization circuit 1

the magnetization circuit has a main circuit and trigger circuit. The charger circuit diagram as shown in figure 3. Main circuit is mainly composed of ac voltage regulator of booster, rectifying energy storage and discharge circuit. By adjusting the bidirectional thyristor vt1 and tv2 phase-shifting Angle ( Or conduction Angle) To adjust the input voltage of the step-up transformer t, and then through the bridge rectifier circuit to get the pulsating dc voltage, the energy stored in the capacitor set of cl. When SCR vt7 conduction, its instantaneous magnetization head to produce strong pulse current discharge, the magnetization of material at high speed. In two-way thyristor synchronous phase trigger circuit, analog module fx0n - 3 a output voltage vout control conduction Angle, to adjust the deposit to the voltage of the capacitance on [ 2, 3, 4] 。

3。 2 system control circuit

figure 4 for the system control circuit, mitsubishi fx1n - chosen 24 Mr For the system master controller, analog fx0n - 3 a has two inputs and one output, input test current and magnetic signal communication, output control bidirectional thyristor conduction Angle.

3。 3 control program design

control program has manual and automatic. Manual control program for capacitance switch and capacitor charging magnetization inspection inspection, debugging and maintenance, etc.

programs contain a sequence control, automatic control program, capacitance hierarchical electronic application, magnetic detection subroutine, HMI interface program, shut the door and the magnetization head connection, such as over-voltage over-current. Because the whole work by water action, so the sequence control will these work in series with the subroutine for writing program is relatively simple, using STL instruction is easy to read.

capacitance hierarchical rechargeable electronic program is given in the zero state may have great impact current when charging, will damage the bridge rectifier circuit and two-way controllable laurel. Secondary batteries to store electrical energy capacitance points, and began to pick up limit resistor r1, after using km2 contact short sub, total pressure charge.

after the magnetization of the workpiece is valve cap to the front of the detection by the coil in magnetic flux, should first integral capacitor nipple discharge (in figure 1 Detection) Inserted, then magnetic artifacts in the coil, you can check to the product of magnetic flux, so as to identify this batch of product performance requirements, at the same time, can be stable and bidirectional thyristor conduction Angle, to ensure the quality of the products.

choose mitsubishi f940got touchscreen, setting parameters and display of running status. Set the number of magnetization, the magnetization current, flux and work status display, etc. Between the HMI interface program is to realize the touch screen and PLC controller configuration. 4 conclusion

magnetizing apparatus storage capacitance pulse discharge, maximum instantaneous discharge current can reach more than 30 ka, high intensity of magnetic field generated in the 10 ms time, will not cause impact to the grid. The magnetization coil, cooperate with the appropriate produce 30000 oe (in an instant Oster) Magnetic field, in view of the ndfeb high coercive force magnet, the magnetization effect is better. The magnetization and magnetic flux detection suitable for assembly line work, has the characteristics of efficient, reliable and anti-jamming, however, reduce the power electronic devices in the on and off on the surrounding influence on further study.

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