JPS5948903A - Electromagnet device - Google Patents

Abstract

PURPOSE:To omit the series resistor of a circuit, and to reduce power consumption by first energizing an electromagnetic coil by a first power supply at high DC voltage and operating an operating section and changing over the first power supply to a second power supply at low DC voltage and energizing the coil. CONSTITUTION:The circuit for the hoisting machine of an elevator is constituted by connecting a series circuit of a changeover means 13 consisting of a brake contact, a control contact 21 and the electromagnetic coil 12 between the plus terminal and minus terminal of the first power supply 30 generating high DC voltage. The second power supply 31 generating DC voltage lower than the power supply 30 is set up in addition to the circuit, and the plus terminal of the power supply 31 is connected to a node between the changeover means 13 and the control contact 21 through a rectifying diode 32, which is reverse-connected to the power supply 30 and forward-connected to the power supply 31. The minus terminal of the power supply 31 is connected to a node between the control contact 21 and the coil 12 throgh a parallel resistor 2 and a diode for discharge reverse-connected to either of the power supplies 30 and 31.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an electromagnetic device powered by a DC power source, and particularly to its control.

Electromagnets generate an attractive force by energizing an electromagnetic coil, and this attractive force operates an actuating part to perform a predetermined operation, and is often used in brakes, clutches, and contactors that fully open and close electric circuits. ing.

Figure 1 shows an elevator hoisting machine that uses electromagnets, and in Figure 9, (1) is the main body, and (2) is the main body (1).
(3) is a rotating shaft that transmits rotational force to this connecting wheel (2), (4) is a brake wheel attached to this rotating shaft (3), (51H this brake wheel ( 4) A pair of brake shoes that fully grip and apply braking, (61i's lower end is rotatably attached to main body (1)K via shaft (6a), and brake is attached to the middle part via shaft (6b)'i+- A pair of brake levers (7) each have a shoe (5) attached thereto and stand upright; one end of the brake lever (7) is fixed to the main body (1), and each extends horizontally through the upper end of the brake lever (6). A pair of brake ronds (8) are attached to the other ends of the brake ronds (7), and a pair of brake springs (9) are respectively engaged with the other ends of the brake ronds (7) and constantly push the brake lever (6) in the inward direction as shown in FIG. is formed into an L-shape, and is an actuating part consisting of a pair of cams that are rotatably attached to the main body (1) through shafts (9a)'e at the M-curved part, and one side of the above-mentioned letter is the brake lever. (6) is in contact with the protrusion (1G). U is a plunger made of a magnetic material that freely passes through the upper part of the main body (11) and is movable up and down. ) is constantly pushed upward by contacting the other side end of the a'au body (1).It is a tubular electromagnetic coil that is housed in the a'au body (1) and is attached to the plunger a9, and is energized by a DC power source to move the plunger Ut. - It is a device that attracts and moves it downward, and it is a coprecipitating electromagnet (1) with the plunger (Lll).
2A). A3 is a switching means consisting of a brake contact which closes an electric circuit when the plunger O2 is in the upper position and opens it when the plunger O2 is in the lower position.

That is, when the electromagnetic coil az is deenergized, the brake lever (6) is moved to the first position by the brake spring (8).
The cam (9) is pushed in the direction shown in the figure, and the cam (9)
Rotate in direction B in Figure 1 to push up the plunger a11i, and use the brake shoe (5) to release the brake wheel (4).
) to completely stop the rotating shaft (3) and stop the rotation of the hitch wheel (2).

Next, when the electromagnetic coil 0z is energized, the plunger Ua
The cam (9) is attracted and rotated in the direction C in Figure 1, and the brake lever (6) is moved to the first position against the brake spring (8).
Move in direction C in the figure. For this reason, the brake shoe (
5) releases the brake wheel (4) to release the braking state.

Here, compared to the urging force required to attract the plunger αυ and keep the cam (9) fully activated, the electromagnetic coil a is larger than the urging force required to attract the plunger Ut and make the cam (91k) operate. This requires a large biasing force.Because of t', when a DC electromagnetic coil Q3 is used, a high voltage is applied when the cam (9) is operated, and after the cam (9) is operated, the voltage is lowered by the resistor. Figure 2 shows a conventional electromagnetic device used for hoisting the elevator shown in Figure 1.
The same reference numerals as in the figure indicate the same or equivalent parts, cA is a DC power supply that outputs a voltage value E volts which is also higher than the rated voltage area of the electromagnetic coil Q, a is a control contact that is opened and closed by a control device (not shown), One end is connected to the positive terminal of the DC power supply (a), and the other end is connected to one end of the brake contact 0. (c) has a resistance value Rp.

A parallel resistor (c) connected in parallel to the electromagnetic coil α force is connected in parallel to the brake contact 0, and is connected to the DC power source (c) through a parallel circuit consisting of the electromagnetic coil (I21) and the parallel resistor c! A series resistor connected to the negative terminal 14 of (to) is set to a resistance value IRQ so that a predetermined voltage is applied to the electromagnetic coil circle.

In an electromagnetic device configured as above.

When the control contact CD is open, the electromagnetic coil Oz is deenergized and the hoist is placed in a braking state. On the other hand, control contact al
When l is closed, the electromagnetic coil 02 U fit -r
21)-tJ3-02-■ is energized with voltage value E by the circuit.

At the same time as the plunger a9 is sucked to release the hoisting braking state, the brake contact αj is opened, so! Magnetic coil O
The circuit is switched and energized: zke(a)-(21)-(c)-(Iku(a)).For this reason, the series resistance □□
□ is inserted and the biasing force is reduced to the value. Next, when the control contact 12υ is opened, ! The electromagnetic energy stored in the magnetic coil (121) is discharged through the parallel resistor (1) and deenergized to bring the 0 winding into a braking state. Dynamic resistance (c)
This required a large amount of electric power. In particular, the parallel resistance Qal″i originally ?a
The electromagnetic energy stored in the electromagnetic coil 12 is discharged, and the control contact (f'L) is provided to suppress the induced voltage when the control contact (20) is opened. It is also used to suppress the voltage applied to the electromagnetic coil (17J) from increasing due to a rise in the temperature of the magnetic coil (12), and to prevent burnout.

Namely.

VB: Applied voltage value of electromagnetic coil Q2 RB: Resistance value of electromagnetic coil O3 In Fig. 2, when the brake contact αJ is opened t'L* in a circuit where the parallel resistor is not used, the applied voltage value VB is .

becomes. On the other hand, when the electromagnetic coil (12 VC parallel resistance The resistance (C) has a small temperature coefficient, so if the resistance value RP and the resistance value (s) remain unchanged and the resistance value RB increases, the applied voltage value V
In formula B9, the voltage value RP is close to the voltage value E, and in the formula Impression? ``The influence on the positive value vB is smaller when the parallel resistance (2) is in contact with μ°'i9. 1.For this reason.

There was a drawback that the power consumed by the parallel resistor CL and the series resistor 03 was large.

Is this invention considered to have the above drawback IC%? ? j
The electromagnetic coil is energized by the first power supply having a higher DC voltage to operate the actuating part, and after one cycle, the power supply is switched to the second power supply having a DC voltage higher than the first power supply -C. The purpose of the present invention is to energize the electromagnetic coil, omit the series resistance of the circuit of the electromagnetic coil, and thereby completely reduce power consumption. In the example, a (1) shows a case where the elevator is hoisted as shown in Fig. 1. In the figure, the same reference numerals as in Figs. 1 and 2 indicate the same parts or parts corresponding to E1, C1l is a first power supply having a high DC voltage, the positive terminal is connected to one end of the electromagnetic coil H via the brake contact 0 and the control contact C11), and the negative terminal is connected to the other end of the electromagnetic coil az. The port υ is connected to the first power supply (
lower than )? "The second power supply has a voltage that can continuously energize the electromagnetic coil α7J, and the negative terminal is connected to the electromagnetic coil u
It is connected to the other end of 2. (The rectifier diode is connected in reverse to the first power supply (7). The rectifier diode is connected forward to the second ′ζ source c11.
1, and the other end is connected between the brake contact (131 and control contact S1), respectively. 431 is a diode for radiation '1b' which is reversely connected to any one of the first power supply c1 and the second ρ power supply c31), and one end is connected to the electromagnetic coil (one end of one side), and the other end is connected to the parallel resistor (2 )It is connected to the.

As mentioned above, please refer to the electromagnet installation.

When the brake centroid, a31, is closed, the first power supply (to), the rectifier diode Gz and the second power supply C(I)
'(A closed circuit is formed through 1m, but the first source is the rectifier diode (the first power source because it is raised by 1) to the second 'iIi 6';', It does not flow to the circuit of Chi.The second box: j170+i has a round voltage, so Vi does not flow to the first power supply ((goods)).

Now, when the control contact C(1) is open, the magnetic coil α2μ is deenergized and the first winding is in a braking state. Next, when the control contact Q1) is closed, the commercial coil α2μ is deenergized. (l
The plunger (llll) is energized by the first power supply (7) by the circuit of
'I sucks in the cam (91 to release the winding braking state. By moving the plunger (Ill), the brake contact +13 is released and the electromagnetic coil Htri CHI) -Cl2) - Cjl) −(1
21-Cl1), and the second power supply 61
). 2nd 'ilf m C11
*1aEFi coil (
1 hub plunger (+11 (z) is used to hold the cam (9) in the operating state. Freeze.

Since it is blocked by the discharge diode (to), no power is consumed by the parallel resistance +a.

Next, when the control contact Qυ is opened, the electromagnetic coil (Ia
According to the embodiment shown in FIG. 3, the electromagnetic energy stored in U itself is discharged through a parallel resistor (2) and a discharging diode (T) and is deenergized to bring the hoist into a braking state. After energizing the electromagnetic coil azl with the first power supply c+tn and fully attracting the plunger α1), activating the cam (9) and releasing the brake on the hoisting machine 9, switch with the brake contact θJ to switch to the lower voltage second With 6υ power supply?
ff Magnetic coil 0z1 (Since it is energized, the series resistor for voltage drop can be omitted.The parallel resistor can be used exclusively for discharging the electromagnetic coil qz, so the discharge diode G31 It is also possible to eliminate power consumption when the electromagnetic coil OzO is in the waiting state.Furthermore, since the 20th power supply 01) is connected to the electromagnetic coil α2 via the rectifier diodes G, the first power supply (to) Even if the brake contact (2) is opened, the electromagnetic coil 021 is continuously energized.

Note that the second power source may be made of a rectifier that rectifies alternating current and converts it into direct current, and in this case, the rectifying diode C (2) in FIG. 3 can be omitted.

In addition, in the above embodiment, when the electromagnetic coil is energized, all parts are in a winding-like braking state, but conversely, the braking state is always released, and when the electromagnetic coil is energized, the braking state is put in place. This invention can also be applied to things.

FIG. 4 shows another embodiment of the switching means.

The same reference numerals as in FIG. 3 indicate the same or corresponding parts. In the figure, (40 is an auxiliary control contact which is closed and opened at the same time as the control contact υ), (Itm) is energized by the closing of this auxiliary control contact (41), and the electromagnetic coil α side is fully connected to the cam (9). This clock means consists of a time relay that opens the normally closed contact (41a) after at least the time required for activation has elapsed.Even with this, the intended purpose can be achieved, and the electromagnetic coil O3 It can be easily incorporated into the 71i' bus circuit.

By the way, in the above explanation, the case where this invention is used for an electromagnetic brake provided on the hoisting side of an elevator has been described, but it can also be used for other electromagnetic devices1. After energizing the electromagnetic coil with the first 'Ff source having a high DC voltage and operating all the operating parts by the magnetic force of this electromagnetic coil, switching to the second power supply having a DC voltage lower than the first power supply. Since the operating state is maintained by switching the electromagnetic coil using a series resistor, there is no need to step down the voltage of the first power source using a series resistor to energize the electromagnetic coil, which has the effect of saving power consumption due to the series resistor. It is.

[Brief explanation of the drawing]

FIG. 1 is a front view of an elevator hoisting system, FIG. 2 is a control circuit diagram of a conventional electromagnetic device applied to an elevator hoisting system, and FIG. 3 is an embodiment of the present invention. 9) is the actuating part, a21 is the electromagnetic coil, α3 is the brake contact (switching means), (7) is the first power source, G1) is the second power source,
(41) is a time relay (clock means). Agent Makoto Kuzuno - former 1st

Claims (1)

[Scope of Claims] +1) An electromagnetic coil energized by a DC power supply, an actuating section that operates through the energization of the electromagnetic coil, and energizing the electromagnetic coil to change the operating section from a non-operating state to an operating state. a first power source that energizes the electromagnetic coil at a voltage lower than that of the first power source to maintain the actuating section in the operating state; An electromagnetic device comprising a switching means for switching from the first power source to the second power source. (2) Claim 1, characterized in that the actuating section is capable of determining the braking state of the brake by one operation.
Electromagnetic device as described in section. (3) The electromagnet device according to claim 1, wherein the first power source and the second power source are connected with the same polarity, and the second power source has a backflow prevention function. . (4) The electromagnet device according to claim 1, wherein the switching means is interlocked with nine actuating parts. (5) The electromagnetic device according to claim 1, wherein the switching means is a clock means that switches the switching after a predetermined period of time has elapsed since energization by the first power source.