JPH05147861A - Elevator control unit - Google Patents

Abstract

PURPOSE:To provide an elevator control unit that improves the extent of riding quality in a way of reducing a thrust variation and simultaneously is able to inexpensively correspond to even to a load capacity variation in an elevator cage. CONSTITUTION:An armature 9 is composed of six armatures 91-96 arranged in the traveling direction of a lifter, while an inverter is composed of inverter in number conformed to these six armatures, and each armature is magnetized by each individual inverter, whereby an armature current is subdivided, and any effect of the armature opposed to each joint 6a is integrally checked and a thrust variation is reduced, while the number of arranged pieces of the armatures is varied, thus these armatures are enabled to correspond to a load capacity variation in an elevator cage inexpensively and easily.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an elevator control device using a three-phase linear induction motor for raising and lowering a car, and more particularly to an elevator control device in which thrust fluctuations at the joints of conductor plates are reduced to improve riding comfort. It is about.

[0002]

2. Description of the Related Art Conventionally, a primary winding (armature) provided on an elevating body, that is, a counterweight or a car, and a secondary conductor (a conductor plate) provided on the hoistway so as to face the primary winding. ) And a linear induction motor, and an elevator control device that drives the car up and down by using the traveling thrust of the linear induction motor is well known.

In this type of device, three-phase AC power supplied to a linear induction motor is controlled by a variable voltage variable frequency inverter (hereinafter referred to simply as "inverter") based on a speed deviation between a traveling speed and a speed command. To be done.

FIG. 3 is a side view schematically showing a conventional elevator control device disclosed in, for example, Japanese Patent Application Laid-Open No. 1-271381, and FIG. 4 shows a counterweight and a linear induction motor and its periphery in FIG. FIG. In the figure, 1 is a car,
2 is a counterweight that offsets the weight of car 1; 3 is car 1
And ropes that support the counterweight 2 at both ends, which are arranged in the hoistway and constitute an elevator that travels integrally with the car 1.

Reference numeral 4 is a pulley installed on the upper part of the hoistway, on which the rope 3 is hung, 5 is a guide rail provided along the hoistway and having an L-shaped cross section, and 6 is sandwiched by a pair of guide rails 5. And a conductor plate made of aluminum, 6a is a joint between the conductor plates 6, 7 is a bracket that supports the guide rail 5 and the conductor plate 6, and 8 is a hoistway provided with the guide rail 5 and the conductor plate 6 via the bracket 7. It is the wall of the pit.

The conductor plate 6 constitutes a secondary conductor of the linear induction motor, and is provided on both left and right sides of the counterweight 2 along the traveling direction of the lifting body, that is, along the hoistway. Further, since the conductor plate 6 has a finite length, a plurality of units are replenished via the joint 6a and are provided on the wall 8 by a length corresponding to the elevating stroke of the car 1. Further, the joint 6a is provided with a slight gap in order to prevent the conductor plate 6 made of aluminum from expanding and bending when the temperature is high in summer.

Reference numeral 9 denotes a primary winding of the linear induction motor, that is, an armature. The primary winding 9 is provided on the counterweight 2 so as to face the conductor plate 6 and sandwich the conductor plate 6 from both sides. The magnetic flux links the conductor plate 6. Ten
Is a speed sensor for detecting the traveling speed V of the lifting / lowering body, that is, the armature 9, and is composed of, for example, a disk rotating in contact with the conductor plate 6 and an encoder interlocking with the disk.

In FIG. 3, 11 is a moving cable connected to the armature 9 and the speed sensor 10 and suspended in the hoistway,
Reference numeral 12 is a control device including an inverter (described later) that receives the traveling speed V via the moving cable 11 and supplies AC power to the armature 9.

FIG. 5 is a block diagram specifically showing the control device 12 in FIG. 3, in which 20 is a power source for supplying three-phase alternating current and 21 is a power source.
A converter composed of a diode bridge that converts the AC voltage from 20 to DC, 22 is a capacitor that smoothes the DC voltage output from the converter 21, 23 is the DC voltage that is smoothed by the capacitor 22 is converted to a variable voltage variable frequency AC An inverter composed of a transistor bridge, 24 is a current transformer that detects the current Im supplied from the inverter 23 to the armature 9 of the linear induction motor, and 25 is connected in parallel to the capacitor 22 and consumes regenerative power from the armature 9. The resistor 26 is a transistor switch that is turned on when power is regenerated and causes the resistor 22 to consume power.

A control circuit 27 generates a three-phase current command Is for the inverter 23 so that the traveling speed V from the speed sensor 10 and the speed command Vs from a speed command generator (not shown) match. Is a PWM circuit that generates a PWM signal P for turning on and off the transistor in the inverter 23 so that the armature current Im and the current command Is match.

Next, the operation of the conventional elevator controller will be described with reference to FIGS. When the speed command Vs is generated from the speed command generator, the control circuit 27 generates the current command Is based on the speed deviation, and the PWM circuit is generated.
28 generates a PWM signal P based on the current command Is,
The inverter 23 is driven and controlled so that the armature current Im matches the current command Is.

As a result, an eddy current is generated in the conductor plate 6 by the interlinkage magnetic flux from the armature 9 and the armature 9 travels along the conductor plate 6 by electromagnetic induction. It is driven up and down together with the armature 9 by a desired speed command Vs.

However, the conductor plate 6 arranged in the hoistway has a gap due to the joint 6a, and the eddy current flowing in the conductor plate 6 is
Since it is discontinuous at the joints 6a of the conductor plates 6 adjacent to each other in the vertical direction, thrust fluctuation occurs when the armature 9 passes through the joints 6a, and the car 1 is swayed and the riding comfort deteriorates.

On the other hand, in order to cope with the increase in the loading capacity of the car 1, the armature 9 needs to be made large, but it is difficult to make the armature 9 longer in the traveling direction in terms of manufacturing, and it is necessary to widen the width. The width of the plate 6 is also widened, which leads to an increase in cost.

[0015]

Since the conventional elevator control device constitutes the linear induction motor by the single armature 9 as described above, it is impossible to reduce the thrust variation caused by the joint 6a. However, there was a problem that the riding comfort was deteriorated. Further, if it is attempted to cope with a change in the loading capacity of the car 1, there is a problem that not only the armature 9 but also the conductor plate 6 is upsized, which leads to an increase in cost.

The present invention has been made in order to solve the above-mentioned problems, and improves the riding comfort by reducing the thrust variation, and at the same time, can inexpensively cope with the change in the loading capacity of the car. Aim to get.

[0017]

An elevator control apparatus according to claim 1 of the present invention comprises an armature composed of a plurality of armatures arranged in the traveling direction of a lifting body, and an inverter corresponding to the plurality of armatures. It is composed of the same number of inverters.

According to a second aspect of the present invention, in the elevator controller, the armature is composed of a pair of left and right armatures arranged so as to individually face a pair of conductor plates, and the joints of the conductor plates are formed. Each pair of armatures is arranged at the same position, and the inverter is composed of a plurality of inverters provided for each pair of armatures.

[0019]

According to the first aspect of the present invention, the individual armature currents are subdivided by exciting a plurality of armatures divided in the traveling direction with individual inverters, and the influence of the armatures facing each other at the joint is comprehensively divided. To suppress thrust fluctuations. Further, it is possible to easily and inexpensively cope with a change in the loading capacity of the car by changing the number of armatures arranged.

Further, according to the second aspect of the present invention, by exciting each pair of armatures by an individual inverter, it is possible to reduce the thrust variation at the joint of the conductor plate and reduce the number of inverters by half.

[0021]

【Example】

Example 1. An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a side view schematically showing an embodiment of the present invention, and 12A corresponds to a control device 12, and 1 to 6, 10
And 11 are the same as above. The peripheral structure of the counterweight 2 is as shown in FIG. 91-96 is counterweight 2
Is a plurality of armatures arranged in the traveling direction on the left and right sides of, for example, three pairs, that is, six.

FIG. 2 is a block diagram specifically showing the control device 12A in FIG. 1, and 27A corresponds to the control circuit 27.
26 to 28 are the same as described above. In this case, the six inverters 23 arranged in parallel are individually provided corresponding to the armatures 91 to 96, and are individually driven by the six PWM circuits 28.

Next, the operation of the embodiment of the present invention will be described with reference to FIGS. Since the basic control operation is the same as that described above, it will not be described here. Each PWM circuit 28 in the control device 12A generates a PWM signal P _A based on the current command Is _A from the control circuit 27A, and each inverter so that the armature current Im _A and the current command Is _A match.
Turn on / off the transistor in 23.

As a result, each inverter 23 generates three-phase AC power and drives each armature 91-96. At this time,
Since the armatures 91 to 96 divided in the traveling direction are excited by the individual inverters 23, the individual armature current Im _A is subdivided into about 1/6, for example. Therefore, the influence of one armature facing the seam 6a is totally reduced, and the thrust fluctuation is reduced.

In the armature facing the joint 6a, the impedance of each phase becomes unbalanced, and even if a balanced voltage is applied to the three phases, the currents of each phase become unbalanced. At this time, if all the armatures 91 to 96 are collectively controlled by one inverter, the three phases of each armature current Im _A are controlled so as to be balanced, so that the armatures facing the joint 6a are controlled. When the currents become three-phase unbalanced, the currents of other armatures that do not face the joint 6a also become three-phase unbalanced.

In this case, only the output of the single inverter is in the three-phase equilibrium state.
Not only the thrust force fluctuation of the armature facing to the armature but also the thrust force fluctuation of twice the power source frequency occurs in other armatures, which promotes the vibration of the car 1. In order to avoid this, the inverter 23 needs to be individually provided for each armature 91-96.

In this way, by controlling each armature 91-96 by the individual inverter 23, even if one armature faces the joint 6a, the other armature holds the three-phase balanced current. Thrust fluctuation does not occur. Further, since the thrust generated per armature is small, the total thrust fluctuation when passing through the joint 6a is reduced.

Further, a change in the elevator capacity can be dealt with inexpensively and easily by selecting the number of armatures arrayed according to the loading capacity of the car, and for a large capacity elevator. Also, simply add a small armature. In this case, the uniformized armatures of the same type of linear motor can be mass-produced, so that the cost does not increase.

Example 2. In the above embodiment, the inverters 23 are provided for all the armatures 91 to 96, but half the number of inverters can be used. That is, if each seam 6a is located symmetrically with respect to the left and right conductive plates 6, the armatures 91-
Since 93 and 94 to 96 are individually arranged so as to face the pair of left and right conductor plates 6, each pair of joints 6a is at the same position with respect to each pair of armatures. Therefore, the inverter 23 can be provided for each pair of armatures 91 and 94, 92 and 95, 93 and 96, and each pair of armatures can be excited by an individual inverter.
As a result, the thrust fluctuation at the joint 6a can be reduced by half, that is, three inverters 23.

In each of the above embodiments, the case where the armatures 91 to 96 are divided into six pieces is shown, but it goes without saying that the same effect can be obtained even if an arbitrary number of armatures and inverters are used.

[0031]

As described above, according to claim 1 of the present invention, the armature is composed of a plurality of armatures arranged in the traveling direction of the lifting body, and the number of inverters corresponding to the plurality of armatures is increased. It is composed of an inverter, and each armature is excited by an individual inverter to subdivide the armature current, comprehensively suppressing the influence of the armature facing the seam to reduce the thrust fluctuation, and the armature arrangement. By changing the number of cars, it is possible to easily and inexpensively respond to changes in the loading capacity of the car, reducing thrust fluctuations and improving riding comfort.
The effect is to obtain an elevator control device that can respond inexpensively to changes in the loading capacity of the car.

According to a second aspect of the present invention, the armature is composed of a pair of left and right armatures arranged so as to individually oppose a pair of conductor plates, and the seams of the conductor plates are arranged in pairs. Arranged in the same position with respect to the armature, the inverter is composed of a plurality of inverters provided for each pair of armatures, and each pair of armatures is excited by a separate inverter Since the thrust fluctuations in the above are reduced and the number of inverters is halved, there is an effect that a more inexpensive elevator control device can be obtained.

[Brief description of drawings]

FIG. 1 is a side view schematically showing an embodiment of the present invention.

FIG. 2 is a configuration diagram showing an embodiment of the present invention.

FIG. 3 is a side view schematically showing a conventional elevator control device.

FIG. 4 is a plan sectional view showing a structure around a counterweight of a general elevator.

FIG. 5 is a configuration diagram showing a conventional elevator control device.

[Explanation of symbols]

 1 cage 6 conductor plate 6a seam 91 to 96 armature 23 inverter 27A control circuit Vs speed command

Claims (2)

[Claims] 1. A conductor plate of a linear induction motor provided along a traveling direction of an elevator including a car, and an armature of the linear induction motor provided on the elevator so as to face the conductor plate. An elevator that supplies three-phase AC power to the armature; and a control circuit that controls the inverter based on a speed command for the car, and an elevator that drives the car up and down via the armature. In the control device, the conductor plate is composed of a plurality of conductor plates arranged in a traveling direction of the elevating body via a joint, and the armature is composed of a plurality of armatures arranged in a traveling direction of the elevating body. The elevator control device is characterized in that the inverter is composed of a number of inverters corresponding to the plurality of armatures. 2. A conductor plate of a linear induction motor provided along a traveling direction of an elevator including a car, and an armature of the linear induction motor provided on the elevator so as to face the conductor plate. An elevator that supplies three-phase AC power to the armature; and a control circuit that controls the inverter based on a speed command for the car, and an elevator that drives the car up and down via the armature. In the control device, the conductor plates are arranged in a plurality in the traveling direction of the elevating body via a seam, and are composed of a pair of conductor plates facing each other on the left and right sides of the elevating body, and the armature includes the pair of conductor plates. The pair of left and right armatures are arranged so as to individually face the conductor plate, and the seams are arranged at the same position with respect to the pair of armatures. Serial elevator control apparatus characterized by comprising a plurality of inverters provided in each pair of armature.