The invention discloses a special power source for a composite electromagnetism constraint vibration device and a control method of the special power source. The special power source is characterized by comprising a rectifying circuit, an energy storage filtering capacitor set, an inverter circuit, a current sampling circuit, an impulse drive plate, a frequency-variable control unit and a man-machine interaction module. The rectifying circuit rectifies input alternating currents into direct currents; the energy storage filtering capacitor set filters output of the rectifying circuit; the inverter circuit converts the direct currents into the power source as needed. Multiple frequencies and amplitudes of the power source needing to be output by the inverter circuit are set by a man-machine interface device, the frequency-variable control unit controls switch devices of the inverter circuit by adjusting an SPWM (sinusoidal pulse width modulation) algorithm, and accordingly, a group of output terminals of the inverter circuit output the power source with the multiple frequencies and amplitudes. The special power source is applied to the composite electromagnetism constraint vibration device to generate composite electromagnetic fields, and can enable a single inductor to generate a composite magnetic field.

Special power source for composite electromagnetism constraint vibration device and control method of special power source

The invention discloses an electromagnetic stirrer control method and system for measuring and controlling stirring force. The real-time torque of stirring is calculated by calculating the current andvoltage of a stirrer, so that the aim of controlling the torque in real time can be fulfilled. Through control of the torque, the stirring force of an electromagnetic stirrer can be controlled more directly, and a better stirring effect and higher molten steel quality are achieved. Specific to the aim of controlling the torque, a direct torque control algorithm of the electromagnetic stirrer is derived, and an electromagnetic stirrer control technology for measuring and controlling the stirring force is proposed. The electromagnetic stirrer control method and system can be widely applied in steel plants using electromagnetic stirring, and can greatly improve the molten steel quality in continuous casting.

Electromagnetic stirrer control method and system for measuring and controlling stirring force

The invention discloses a double PWM variable frequency power supply energy balancing device and a method thereof. The method comprises the following steps that the device is provided with a chargingcurrent acquisition circuit, a voltage acquisition circuit and a load current acquisition circuit, and the charging current acquisition circuit, the voltage acquisition circuit and the load current acquisition circuit are used for acquiring the charging current of a bus capacitor, the voltage of the bus capacitor and the current of a load side three-phase coil; the input energy, the output energyand the current energy of the bus capacitor are calculated by using the acquired numerical value; and the difference between the input energy and the output energy, the current energy and the expectedcurrent energy are incorporated into a PI control loop, and the PWM rectifier and the PWM inverter are controlled for dynamic coordination work through the PI control loop. Therefore, the double PWMvariable frequency power supply energy balancing device and the method thereof solve the problem of uneven energy distribution in the prior art, and have the advantages of stable and reliable work, strong anti-interference performance, reasonable structure, strong reliability, good adaptability and convenient operation.

Double PWM variable frequency power supply energy balancing device and method thereof

The utility model relates to an electromagnetic stirrer variable-frequency power source capable of automatically balancing output currents. The variable-frequency power source consists of a rectifier, a pre-chargeable circuit, a reactor, a filter capacitor group, an inverter, a detection unit and a control circuit, wherein the detection unit is used for detecting three-phase output current signals of the variable-frequency power source and feeding back the signals to the control circuit; the control circuit adjusts SPWM waves of the control circuit through the control circuit and outputs signals to the inverter after receiving the feedback signals, so that differences among three-phase output currents of the variable-frequency power source are reduced and kept consistent finally. The variable-frequency power source is reliable in working performance and overcomes the defect that three-phase currents of traditional electromagnetic stirrer variable-frequency power sources cannot be adjusted independently.

Electromagnetic stirrer variable-frequency power source capable of automatically balancing output currents

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Electromagnetic stirrer variable-frequency power source capable of automatically balancing output currents