JPS59167461A - Controller for winding drum type 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 The present invention relates to an improvement in a device for controlling a winding drum type elevator.

It has been proposed to use a winding drum driven by a single-phase induction motor in a small, low-speed elevator with a short lifting stroke. This is shown in FIGS. 1 to 3.

In Figure 1, (1) is a single-phase induction motor, (2) is an electric motor (
1) is a worm directly connected to the worm, (3) is a worm wheel that meshes with the worm (2), (4) is a worm, a winding drum is connected to the wheel (3), and (5) is a winding drum that is connected to the winding drum (4). the main rope being taken off and unwound from the winding trunk (4);
(6) is a pulley attached to the ceiling (7) of the hoistway and around which the main rope (5) is wrapped, and (8) is a car connected to one end of the main rope (5).

In Figures 2 and 3, R and S are single-phase AC power supplies (1A)
is the main winding of the motor (1), (lB) is also the starting winding,
OQ is the starting capacitor connected in series to the starting winding (IB), (1la) and (1lb) are the power supply R, respectively.
The rising magnetic contactor contact is inserted between S and both ends of the main winding (1 person) and closes when the car (8) rises, (llc) is the contact between one end of the main winding (1A) and the starting capacitor A1 The rising magnetic contactor contact (lld) connected to one end is the rising magnetic contactor contact (12a) connected to the other end of the main winding (IA) and one end of the starting winding (IB). )～(1
2d) is a descending magnetic contactor contact which is connected in the same way and closes when the car (8) descends, (13) is a contact (lla),
A bidirectional thyristor is inserted between (12a) and one end of the main winding (IA), (14) is a speed command generator that generates a speed command signal V, and (16) is a speed command generator that is directly connected to the motor (1). A speedometer generator that generates a speed signal vt proportional to the rotational speed, (16) is a speed command signal V and a speed signal ■
(17) is an ignition circuit that generates an ignition command signal v0 from the output of the arithmetic unit (national).

That is, during upward operation, the electromagnetic contactor contacts (11a) to (
11d) closes and fires the bidirectional thyristor 03), voltage is applied to the starting winding (IB) and the main winding (IA), the motor (1) starts, and the motor torque and load are changed. It rotates at a rotational speed determined by the point where the torque is balanced. At this rotation speed, the bidirectional thyristor (13) receives the firing command signal ■. It is adjusted by being controlled by.

The same goes for descending operation, and the magnetic contactor contacts (12a) to (1
2d) and firing of the bidirectional thyristor 03). In this case, the motor (1) is pulled by the weight of the heel (8), so the rotational speed of the motor (1) exceeds the synchronous speed and rotates at a rotational speed determined by the sum of the regenerative braking torque and the load torque. do.

The car (8) moves upward or downward at a speed corresponding to the rotational speed of the electric motor (1) determined in this manner. When the car (8) stops, a brake (not shown) is applied, and the bidirectional thyristor (13) is turned off and contacts (lla) to (xxxa) or contact (12a)
By opening (12d), power supply to the electric motor (1) is cut off.

However, conventionally, no particular consideration has been given to the closing/opening of the contacts (lla) to (11d) or contacts (12a) to (12d) and the order of firing and extinguishing the bidirectional thyristor. Therefore, the contacts (lla) to (11d) or the contacts (12a) to (12d) may turn on or cut off current.Therefore, the contacts (lla) to (11d) or the contacts (12a) to (12d) wears out and needs to be replaced periodically.

Moreover, in order to raise or lower the car (8), it is necessary to use electromagnetic contactors for raising and lowering, which makes the circuit complicated and expensive.

This invention improves the above-mentioned problems by inserting a running contact between the main winding of a single-phase induction motor and the power supply, and a thyristor capable of bidirectional control in series with the starting winding. It is an object of the present invention to provide a control device for a drum-type elevator in which the wear of contacts is small and the number of electromagnetic contactors can be reduced.

An embodiment of the present invention will be described below with reference to FIGS. 4 to 6.

In the figure, - is a bidirectional thyristor connected in series with the starting winding (IB), Qυ is a bidirectional thyristor connected in series with the main winding (IA), and rH when operating the handle (8).
J and the operation command signal which becomes rLJ when stopped, (
C) is the firing command signal which becomes rHJ when firing the thyristor Qυ and rLJ when extinguishing it, @ is OR
The gate, (a) is an AND gate, the handle is an operating electromagnetic contactor, (26a) to (26a) are its normally open contacts, @ is the ignition electromagnetic contactor, and (27a) is its normally open contact. be. Other than the above, it is the same as in FIGS. 1 to 3.

Next, the operation of this embodiment will be explained.

When the car (8) is operated, the operation command signal (a) and the firing command signal (e) become rHJ.

Now, let us assume that the car (8) is in upward operation, and that the signal (A) and the wire are at rHJ as described above. Signal (a)
When becomes rHJ, the output of the OR gate (c) becomes rHJ, the operating magnetic contactor (c) is energized, and the contact (26
a) to (26) are closed. By closing the contact (26c), the output of the AND gate (c) becomes rHJ, the ignition magnetic contactor is energized, and the bidirectional thyristor ( property)i, al) are fired.At the same time, the contact point (2'7
a) is closed, and the operating electromagnetic contactor (c) is held.

Next, the ignition command signal V. is supplied, the electric motor (1) starts and the shaft (8) rises. Then, when the bidirectional thyristors (20) and (21) are fully fired, the electric motor (
1) generates the electric motor torque T, n1 shown in Fig. 6, rotates at a rotational speed determined by the point A where the torque and the load torque T0 are balanced, and the car (8) runs at a constant speed.Car (8) When stopping the operation command signal (c) and ignition command signal (4), the signal becomes rLJ. When the signal threat reaches rLJ, the ignition electromagnetic contactor (c) is deenergized, and the ignition command signal The supply of v0 is cut off, and the bidirectional thyristor Oka extinguishes.

At the same time, the contact (27a) is opened, so the OR gate (
The output of c) becomes rLJ, the operating electromagnetic contactor (a) is deenergized, and the contacts (26a) to (26c) are opened. A brake (not shown) is then applied to the electric motor (1), and the car (8) is stopped.

In this way, at startup, the contacts (26a) and (26
After b) is closed, the bidirectional thyristor (20), (g
υ fires, and when stopped, the bidirectional thyristor (2o7, (
Since the contacts (26a) and (26b) open after the arc in c) is extinguished, the contacts (sa6a') and (26b) do not turn on or cut off current.

During descending operation, the operating order of the operating electromagnetic contactor (a) and the ignition electromagnetic contactor is the same. However, in this case, the bidirectional thyristor (20) is not fired. That is,
When the brake is released by the operation command signal (a), the car (8) naturally falls under its own weight. Bidirectional thyristor Qυ
By adjusting , the electric motor (1) generates a single-phase torque, and when the bidirectional thyristor Q1) is fully fired, it generates the single-phase torque T,2 shown in FIG. Then, the electric motor (1) exceeds the synchronous speed and rotates at a rotational speed determined by the point B where the regenerative braking torque Tm3 and the load torque T1 are balanced, and the car (8)
runs at a constant speed. The operation when the paddle (8) is stopped is the same as when it is raised.

FIG. 7 shows another embodiment of the present invention, which has exactly the same configuration as FIG. 4 except that the bidirectional thyristor e]) is removed.

This embodiment does not require control of the single-phase torque T IB)
is cut off, so the contact point (26a),
It is clear that the burden on (26b) is reduced.

Moreover, the bidirectional thyristor (20) of the above embodiment, (
2]), thyristors connected in antiparallel may be used.

As explained above, in this invention, a running contact is connected between the main winding and the power supply of a single-phase induction motor, and a thyristor capable of bidirectional control is connected in series with the starting winding. The thyristor is ignited after the ignition is closed, and when the thyristor is stopped, the thyristor is extinguished and the contacts are opened.
The burden of turning on and cutting off current at the contacts is light, and the number of times the contacts are replaced can be reduced. Furthermore, since the number of contacts is halved, it can be constructed at low cost.

[Brief explanation of drawings]

Fig. 1 is a configuration diagram showing a drum type elevator, Fig. 2 is a motor circuit diagram showing a conventional control device for a drum type elevator, Fig. 3 is a similar ignition control circuit diagram, and Fig. 4 is a diagram according to the present invention. A motor circuit diagram showing one embodiment of a control device for a drum type elevator, FIG. 5 is a sequence determination circuit diagram used in FIG. 4, FIG. 6 is a torque characteristic curve diagram of the induction motor in FIG. 4, and FIG. The figure is a motor circuit diagram showing another embodiment of the invention. (1)... Single-phase induction motor, (IA)... Same left main winding, (IB)... Same left starting winding, (4)... Winding drum,
(8)...elevator car, (company), 121)・
・Bidirectional thyristor, (a) ・・operation command signal, (
C)...Ignition command signal, (C)...OR gate, (C)...AND gate, (C)...Magnetic contactor for operation, ψ]...Magnetic contactor for ignition Note that the same reference numerals in the figures indicate the same parts. Agent Makoto Kuzuno (1 other person) Figure 1 Figure 2 Figure 3 Figure 4 Figure 5 Figure 6 Figure 7) 06 Procedural amendment (voluntary) 1. Indication of case Patent application 1984-41817 No. 2, Title of the invention Control device for drum elevators 3, Relationship to the amended case Patent applicant address 2-2-3 Marunouchi, Chiyoda-ku, Tokyo Name (601) Representative of Mitsubishi Electric Corporation Hitoshi Katayama Hachibe 4, Agent Address: 2-2-3-5 Marunouchi, Chiyoda-ku, Tokyo
, Subject of amendment (1) Detailed explanation column of the invention in the specification (2) Figure 7 6 of the drawings, Contents of amendment (1) In the second line of page 6 of the specification, "(8) rises" Correct it to "(8) rises." (2) On page 8, line 10 of the same page, the phrase “above embodiment” was replaced with “
Each of the above embodiments” is corrected. (3) As shown in the attached drawing, the code ``15'' in Figure 7 of the cylinder in the drawing is corrected to ``20''. 7. Drawing showing Figure 7 after correction of catalog of attached documents 1 or more copies v, 7 Figure 413-

Claims (1)

[Claims] A winding drum driven by a single-phase induction motor having a starting winding and a main winding is provided, and the car is operated by winding the main rope around the winding drum during upward operation, and by winding the main rope around the winding cylinder during descending operation. In a device in which the main rope is unwound from the trunk to operate the above-mentioned heel, a contact that is inserted between the main winding and the power supply and closes regardless of the direction of operation of either of the above-mentioned ends, which is connected in series with the above-mentioned starting winding. A thyristor that is connected to the thyristor and can be controlled in both directions, and when one of the above is started, the above contact is closed and the thyristor is ignited, and when one of the above is stopped, the thyristor is extinguished and the above contact is turned on. A control device for a winding drum elevator, characterized in that it is equipped with an opening sequence determining circuit.