JPS6077624A - Device for protecting elevator - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] [Technical Field of the Invention] The present invention relates to an elevator in which a car is driven by an inverter including semiconductor elements such as power transistors, and in particular, to extend the life of these semiconductor elements. This relates to a protective ambiguity device.

[Prior art]

In recent years, due to the progress of power transistors and their control technology, an elevator has been proposed in which the electric motor for driving the car is completely controlled by an inverter made of power transistors.

In this type of power transistor, as shown in Figure 1, an aluminum vapor-deposited film (2) is completely formed on a silicon electrode (1), and one end of an aluminum lead wire (8) is covered with a deposited film (2). , connect the other end of this lead wire (3) to terminal (4) VC-T:'t
'Lzona frequency bonding! The friends are joined by soldering.

On the other hand, since the elevator repeatedly starts and stops, an intermittent current Rr flows through the power transistor. Therefore, the temperature T at the junction W between the power transistor's voltage d(1) and the lead, fM(s+), repeats a rise and fall of two steps each time it is operated, as shown in FIG. 2, VC. A song that shows the relationship between time and temperature.D i'i'It changes depending on the frequency of operation of the elevator, the distance traveled, the load inside the car, the direction of operation, etc. Due to the difference in thermal expansion coefficient between silicon and aluminum,
2) Stress occurs between them. The deformation of the deposited film (2) due to this stress adversely affects the VC junction wVc, and the lead wire (8) eventually peels off from the deposited layer (2).

This is not limited to power transistors, but the same situation occurs when other semiconductor elements having a somewhat similar structure are used.

・, ° [Summary of the invention] The present invention was made for the purpose of eliminating the above-mentioned drawbacks,
While forcibly cooling the semiconductor elements that make up the inverter,
C. Maintaining the temperature of the semiconductor element at approximately -1 by changing the amount of cooling in accordance with the electric motor current for the side of the car.9. Proposal for an elevator maintenance system that can significantly extend the life of this semiconductor element. It is something to do.

[Embodiment of the Invention] The sixth core is a Glock diagram showing the configuration of an embodiment of the elevator protection device according to the VC of the present invention, together with the mechanical system.

In the same figure, when the three-phase AC voltage C1 is applied, the membrane flow circuit (12)
is connected. VC between the output terminals of this rectifier circuit (121) includes a smoothing capacitor ( ) and a power transistor kumquat, and is controlled by a control circuit (not shown).
The inverter Cl4J and the inverter Cl4J are subject to legal regulations. In addition, an induction motor (induction motor) is connected to the output end of the inverter C141.
The sheath 06 is connected to the shaft of the induction motor (15) via a speed reduction mechanism (not shown). In addition, seeds 0
A rope α'I) is wrapped around 6, and one end of it is tied around (
The other end is rigidly connected to the fishing platform weight α9).

On the other hand, a transistor is used for VL between the output terminals of the rectifier circuit (121), and a base drive circuit Bq FC
Therefore, the other inverter +211 that is not controlled is Mi.
frjc za9. Also, this inverter (211
A fan motor J is connected to the output end of the motor which rotates the fan and cools the impark (14 power transistors). Between the inverter 0 and the induction motor A backflow device is provided as a current detection means, and its secondary side is a pacedramp circuit 122IV.
There are nine consecutive L-handles.

The operation of the mounting mechanism of the elevator constructed as described above will be explained below.

First, the output of the rectifier circuit (211) is connected to a capacitor (121) and then to a smoothing inverter (211).

Among these, the inverter Q gradient is determined by controlling the base current of the power transistor by a control circuit (not shown). supply voltage,
This flK process (μs) is driven.

At this time, a current transformer ■V (
Therefore, the detected current 4g is the base drive circuit 1. I! 21 VC added. This base drive circuit tqa inverter [211'i controls, and the fan motor Q! At the same time as the rotational speed of the fan 23+ is controlled, the air volume of the fan □□□ is also controlled. In this case, the fan example is inverter C1! It cools the power transistors that make up the device.When the current value of the induction current generator (+5) increases, the temperature of the junction of the power transistor also rises, so in order to suppress this temperature rise, The base drive circuit diagram is controlled by the inverter (211'i) so that the base drive circuit diagram is maintained at VC (211'i).

The base drive circuit (22) not only changes the rotational speed of the fan motor J according to the input current of the induction circuit (22), but also changes the current continuation tl, VCJ:
Tsutet fan motor (4) 10 rotation speed hidden? ! :I try to keep the temperature of the power transistor as close to the constant value VC as possible. 2. This constant value does not mean a constant temperature in the strict sense of the word, but rather the change in temperature.
In consideration of the temperature difference between the surface part and the circular part due to heat conduction during I-work, it refers to a heat shielding enclosure that has a width to the extent that thermal stress can be virtually ignored.

Thus, inverter C1 maintains the temperature of the power transistor at approximately -11Iivc, and replaces this with V.
When the lead M (81) is peeled off from the vaporized film (21), the drawbacks of the conventional device are removed, and the life of the power transistor can be greatly extended.

In this embodiment, the entire outer surface i1N] of the power transistor is cooled by the fan example, but the lead wire (8
) and the silicon electrode (1) can be surface-cooled.

Figure 4 shows the lead wire junction as a heat pipe lI? - In the example of cooling by cooling, the evaporation part Ai lead of the heat vibrator #i
! It is placed near the joint, and its condensation part B all cases (81
), and the inside of the case (8I) is fully filled with resin in order to increase heat conduction efficiency.

Figure 5 is an enlarged partial cross-sectional view of the structure of the heat pipe cabinet, in which a wick decoy is provided as a separate route for the VC liquid flow (6) on the inner surface of the container, and the steam is heated at the center of the shaft. A passage for the flow (□□□) is formed, and one end in the axial direction is evaporated.
, the center part is the heat insulating part C1 and the other end part is the condensing part BVc. Of these, heat 1161 enters in the evaporator A, and heat 1161 flows out in the condenser B.

Thus, the condensing part B is made to protrude outside the case 4) as shown in FIG.
: When the leads are held close to each other, the joints of the leads effectively cool σn, and the cooling action similar to that of the fan and PJ described above is performed.

It is clear that cooling the condensing part B with a fan or the like will increase the cooling effect by dispersing coolers, and by using a VC with this heat pipe, there is no need to consider the temperature difference between the lead wire joint and the outer surface recess. , the temperature of the lead wire joint can be easily maintained at a substantially constant value.

2.The 6th tri by the power transistor maker Senzo
As shown in the figure, even if a contact point IZBI of a relay (not shown) that sends 1 lil during elevator operation is inserted in the power supply circuit of the fan motor 1, and the air bubbles are sent only while the elevator is operating, the power transistor The temperature fluctuation range can be suppressed to a considerably narrow range.

2. In the above embodiment, an inverter including a power transistor was explained, but the present invention can be applied to any inverter that uses semiconductor elements with lead wires connected to the folds and the lead wires, even if the inverter is made of silicone. can do.

〔Effect of the invention〕

As is clear from the above-mentioned Yoshiaki Vc construction, the elevator maintenance device of the present invention is designed to forcibly cool the semiconductor elements that make up the entire impark, and also to cool them according to the current of the drive electric VI machine. Since the amount is reduced, the temperature of the semiconductor element can be maintained at approximately -1, and the life of the semiconductor element can be significantly extended by adjusting this fL.

[Brief explanation of the drawing]

Figure 1 is a partial sectional view showing the configuration of a power transistor used to control the elevator, Figure 2 is a diagram showing the relationship between time and temperature of this power transistor at Vc2 during elevator operation, and Figure 3. 4 is a block diagram showing the entire mechanical system of an embodiment of the elevator protection device according to the present invention, FIG. 4 is a sectional view showing the structure of the main parts of another embodiment, and FIG. FIG. 6 is a perspective view partially shown in cross section to explain the structure of the main parts constituting the embodiment, and FIG. 6 is a wiring diagram showing the configuration of the crown part of another embodiment. (1): Silicon electrode (2): Vaporized film (8): Lead wire (Sword: Terminal (1 phrase: invert μs): Induction motor: Current transformer as a current detection means +211: As a cooling control device Inverter l;!:
3I: Fan Motor Example 2 Fan Cabinet: Heat Pipe Agent Masu Oiwa

Claims (1)

[Claims] An elevator V in which an electric motor for driving a car is controlled by an inverter VC including a semiconductor element having lead wires connected to electrodes.
cj = -, the semiconductor element is forcibly cooled, and
a cooling device with a variable cooling chamber; a current detection means for detecting the input current of the electric motor; and a VC cooling device that maintains the temperature of the semiconductor element at approximately -100, based on an output signal of the current detection means. A protection device for an elevator, which is completely characterized by being equipped with a cooling control device for full control.