FI66701C - KOPPLINGSFOERFARANDE - Google Patents

Description

Rytkentämenetelmä. 66701

The invention relates to the coupling of various electromagnets supplied with different direct current, in particular to electromagnets, and to their de magnetization by self-induction current.

It is previously known from U.S. Pat. 2.445 * 4-59 shows a method for demagnetizing an electromagnet with its own self-induction current. From the description of the invention, paragraph 5 line 57 - paragraph 4 line 20, the following limitations and disadvantages related to the use of the invention can be seen: - the method is intended for low power electromagnets, - the method is difficult to implement with high power electromagnets due to the large space required by capacitor C, Instead of C, a polarized capacitor cannot be used, - capacitor C is completely discharged during demagnetization and must be recharged

The present invention has been led by an attempt to develop a method for demagnetizing high power electromagnets with their own self-induction current.

In comparison, U.S. Pat. The present invention has the following advantages: - the method is not limited to low power electromagnets, but is suitable for all electromagnets regardless of their power, - the method allows the use of polarized and non-polarized capacitors as well as their combined use, - demagnetization does not consume - the self-induction voltage generated by the magnetizing current in the solenoid winding circuit can be limited to a suitable value by the capacitors, so that a transistor, thyristor or similar switch can be used instead of a contact switch as a switch for the excitation circuit ·

The present invention is characterized by what is stated in the claims ·

The invention is described below with reference to the accompanying drawings below:

Figure 1 · A circuit according to the method with two diodes

Figure la. A circuit functionally equivalent to the previous circuit

Figure 2. A circuit according to the switching method with one diode

Figure 2a · A circuit functionally corresponding to the previous circuit

Figures 3,4,5 · Voltage / time plots related to Figure 1.

When the circuit (1) shown in Fig. 1 is closed by the switch K, the voltage of the current source VL acts at the terminals of the coil L of the electromagnet H (Fig. 3, Tj-Tg), the current flowing magnetizes the electromagnet U, the electrolyte capacitor C · ^ charges the current source VL to a voltage higher than the voltage (Fig. 4, T ^ -T2) and the electrolyte capacitor C2 is charged by a pulsating DC current through the diode D2 to a voltage lower than the voltage of the power supply VL (Fig. 5, T ^ -T2). As an exception to the above, when pure direct current is used, only capacitor C1 is charged, capacitor C2 is left uncharged until the excitation current is switched off and capacitor C2 is charged by the self-induction current · When the circuit (1) is switched off by switch K, the electromagnetic field energy is discharged. a self-induction voltage of opposite polarity to the voltage of the current source VL (Fig. 3, Τ2-Τ ^), d0 ^ a raises the charge in the electrolytic capacitor C2 through the diode D2 3 66701 and the electrolyte capacitor (Fig. 4, T2-Tj) current in the opposite direction to the demagnetization current, which partially cancels the charge in the electrolytic capacitor C · ^ (Fig. 4, TpT ^) · After de-magnetization, the electrolytic capacitors C1 # C2 have charges of the same voltage values (Figs. 4 and 5 * T). T ^). In cases where the charge generated in the electrolytic capacitor is sufficiently large, functionally the same result can be obtained even without diode D2 (Fig. 2). Depending on the application, the electrolytic capacitors C1 and C2 in the circuits according to the coupling method shown (Figs. The switch K of the magnetizing circuit can be a contact switch, a transistor, a thyristor or a similar current switch.

The above coupling method is suitable for coupling and demagnetizing various direct current inductances, especially electromagnets, with their own self-induction current.

Claims (9)

1 · Coupling method for coupling direct current inductors, in particular electromagnets and de-magnetizing them with the aid of current generated by self-ignition, characterized in that the poles of the electromagnet (M) coil (L) are two & between each other in series of standing capacitors (C-C) and that the terminals of each capacitance (C C Cg) have been connected to a semiconductor (D ^, Dg) or to be connected to the poles of one capacitance (C₂), the semiconductor (D ^) has been switched on, so that the switch (K) is located in the magnetization circuit 2 · Coupling method according to claim kraur 1, characterized in that pole capacitances (C a semiconductor (D ^ Dg) · Coupling method according to claim 1, characterized in that the polarized capacitances (Cj + Cg) have been connected in series in such a way that their similar poles are mutually connected and to the poles of one capacitance (Cg) have been connected a latched semiconductor ( D) 4. A coupling method according to claim 1, characterized in that the semiconductors connected to the poles of the unpolar capacitances have been connected in series in such a way that their cathodes or anodes have been interconnected. 5 # Coupling method according to claim 1, characterized in that only a semiconductor is coupled with the poles of one unpolar capacitance Coupling method according to claim 1, characterized in that cathodes or anodes of the semiconductor coupled to the poles of the capacitance capacitance and the semiconductor poles of the unpolished capacitance have been connected.