JPS603106A - Controlling method of lifting electromagnet - Google Patents

Abstract

PURPOSE:To simplify the controller of a lifting electromagnet by a method wherein whole thyristors of six pieces are triggered wholly at initially exciting time of a coil for the lifting electromagnet, and feeding of the gate signals of the thyristors of two pieces constructing one arm are stopped at ordinarily exciting time. CONSTITUTION:A control rectifier circuit 2 is formed by constructing thyristors 2a-2f in three-phase whole-wave bridge connection, a three-phase AC electric power source 1 is connected to the input side, and a coil 3 for lifting electromagnet is connected to the output side. A trigger circuit 4 feeds the whole trigger signals of the thyristors 2a-2f. When the coil 3 is to be initially excited, signals to trigger wholly the whole thyristors 2a-2f are fed from the circuit 4 by setting a control circuit 5. After the rise of the current of the coil 3 is completed, the circuit 4 is made to act according to the operation of the circuit 5 to excite the trigger of only the thyristors 2a, 2c, 2d and 2f. Moreover when the electric power source voltage drops, the circuit is changed automatically over three-phase whole-wave control to prevent a loading substance from an unexpected drop. Accordingly, the controller can be simplified.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a control method relating to the interaction between initial 1υJ excitation and steady excitation of a fishing electromagnet.

Generally, a fishing electromagnet is equipped with a DC excitation coil with an extremely large number of turns, and the inductance of this coil tends to decrease. The rise of the current flowing into the rod is kept low, and it takes a considerable amount of time to obtain the excitation current required to attract the fished object.

Therefore, as a conventional excitation method for fishing electromagnets, a voltage higher than the rated DC voltage is applied only for initial excitation to speed up the rise of the current, and then the current is lowered to the rated voltage for steady excitation.

By the way, it is usually a fishing type! Electric power for 'Ei control 911 is obtained by controlled rectification of commercial power supply. For this reason, there is a drawback that the device for controlling the phase of the thyristor is multifunctional and expensive.

The purpose of this invention is to introduce a three-phase power supply to the input terminal of a controlled rectifier circuit consisting of a three-phase bridge connection of I-nyristors, and perform voltage control based on three-phase or single-phase full firing control of the thyristors. Control unit; i's fl! 11j.

Hereinafter, the method according to the present invention will be specifically explained with reference to the illustrated embodiments. The figure is a circuit diagram of an IC embodying the present invention, and in the same figure, 13 C1 is a three-phase AC power supply. 2
is a control 611 rectifier circuit, six thyristors 2a, 2L+
, . . . 2 [are configured by connecting them in a three-phase full-wave bridge, and the - distribution phase AC power supply is connected to the input side. Reference numeral 3 denotes a fishing electromagnet 21, which is connected to the output side of the control rectifier circuit 2. 4 is the ignition circuit [, each 1 in the control rectifier circuit 2
Noirista 2a, 2b.

...2 [full firing signal is supplied. A control circuit 5 determines the supply signal from the ignition circuit 4 and regulates the ignition of the thyristors 2a, 21), . . . 2[.

In the above 16 formations, first, fishing top type) (n6 coil 3
When initially energizing, the setting of the control circuit 5 (for example, by manually operating a switch) causes the ignition circuit 4 to supply a signal for ignition of all the thyristors 2a, to 2[, and The voltage energizes the coil 3 through the controlled rectifier circuit 2 and through the three-phase full-wave rectifier 17. In other words, the initial excitation is approximately 1't\i.The fishing hook 1 electromagnet coil supplies a three-phase full-wave current to the magnet coil 3, increases the excitation current, and significantly limits the change in current. The current rises faster against the inductance of 3. After the current rise has been completed in this way, the state remains as it is (No. The ignition circuit is activated by operation of the control circuit 5 in order to prompt the first arm to remain in position → the Nylisters 2b and 2c are in the closed position.This operation may be performed manually or by a timer. The current given to the coil 3 for this fishing electromagnet is 1) carried by one-phase full-wave J5, and the excitation power is reduced by 4J compared to three-phase full-wave, which prevents overexcitation? ;There is no room for consideration.

On the other hand, if the single-phase gold wave is in a favorable condition (the heating voltage is low and the object is neglected, the ignition circuit 4
When a voltage of 1 J is introduced into the AC power supply, the effects of the undervoltage + r tit electric appliances are controlled by 1 (all of the control rectifier circuits 2, regardless of the state of the control circuit 5). - Iristors 2a to 2[ can all be covered by Jj1 arc.

In addition, the control device 5 is related to the decrease in the power IEL of the power supply 1.
If accurate operation of the ignition circuit 4 cannot be obtained, the voltage applied to the fishing electromagnet coil is passed through the reducing resistor and the switch element to the signal Wj, and the switch element is switched to A. It is good to use A-f control.

As stated above, the fishing electromagnet control method according to the present invention achieves overexcitation as seen in three-phase full-wave rectification during the initial motion ff11, and overexcites as seen in three-phase full-wave rectification during constant 7jS excitation. This is something that I was designed to take on. With this method, the thyristor only needs to be operated under full ignition control, and the practical advantage is that a complicated control circuit based on phase control is not required at all. In addition, when the power supply voltage drops, unexpected dropping of the loaded object is prevented by means of automatically switching from single-phase full-wave control 11 to three-phase full-wave control 11 based on this voltage drop. -ノ')、Electrical 81; fli due to the decrease in voltage
ll tin! ! l'! Pulse generation for igniting the four thyristors in the flow circuit 1q gate signal to
By tin 1. It will be done.

[Brief explanation of drawings]

The figure is a circuit diagram for explaining the method according to the present invention. 1... AC power supply 2... Control rectifier electromagnet 28~2C
... Thyristor 3 ... Fishing electromagnet 4 ... Ignition circuit 5 ... Control circuit Applicant: Shinko Kokoro Iku Daitanukito Co., Ltd. Patent attorney Sai iH Haruya

Claims (1)

[Claims] 1. AC power source, and receiving electric power from this AC power source, 6.
In a circuit configuration that is equipped with a control rectifier circuit 4y from an individual resistor and supplies the output of this control rectifier circuit to a coil for a fishing electromagnet, when the coil for a fishing electromagnet is first excited, the above six A method for controlling a fishing electromagnet, characterized in that all 1 noise risks are fully ignited, and when the steady state 1ii1+ti11 is reached, the gate signal supply to all 12 glue iris resistors in one arm is stopped. 2. AC power supply; Receiving power from this AC power supply, a full Il + rectifier circuit consisting of six glue iris transistors is applied, and the output of this control rectifier circuit is supplied to the fishing electromagnetic six-way coil. For the initial excitation 111 of the fishing electromagnet coil, all six thyristors are fully fired, one arm is used for steady bdJ magnetic alignment, and the signal supply to 1 of the 12 thyristors is stopped, and the AC power supply is turned off. Voltage low F
Accordingly, a control method for a fishing electromagnet is made so that all 1 noise risks are fully ignited even during steady excitation. 3. AC power supply and a Cp that receives power from this AC power supply, 6.
In a circuit configuration that includes a control rectifier circuit consisting of Zyristors and supplies the output of this control rectifier circuit to a fishing electromagnet coil, initial excitation of the fishing electromagnetic coil 111
On the 1st, all 6 of the above-mentioned cylinders are fired at full cost, steady excitation + 1111i5 has 1 arm, and 2 glue iris stars are placed in the 1 month supply, and the power for ignition of each V iris is set as above. A control force method of 1) characterized in that the input voltage to the upper electromagnet coil is obtained through a reduction means and a switching element.