JP2005145637A - Elevator driving system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an elevator driving system capable of securing the safety of the system for driving a car by two hoisting machines as well as balancing the driving distance of the two hoising machines. <P>SOLUTION: The elevator driving system moving up/down and driving the car by a plurality of hoisting machines 70 comprises an abnormality detecting means 200 detecting any one or combination of differences in a driving torque, a rotational speed, or a rotational distance of the plurality of hoisting machines, and determining an abnormality when the difference is not less than a prescribed value. When the abnormality is detected, the upward/downward drive of one or two hoising machines is stopped. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to an elevator drive system.

FIG. 5 shows a basic configuration example of an elevator drive system that drives a car with two hoisting machines. In FIG. 5, the same reference numerals indicate the same parts, and the subscripts a and b are described separately for each of the two hoisting machines. The elevator drive system shown in FIG. 5 is a combination of two conventional 1: 1 roping systems shown in FIG. 6 and a single car. FIG. 5 also shows an elevator drive system according to Embodiment 5 of the present invention to be described later.
In this system, the load applied to the two hoisting machines and the load applied to the suspension ropes 5a, 5b are equal if both the hoisting machines are driven at exactly the same speed. However, even if the two hoisting machines are controlled at the same speed, it is inevitable that a certain speed error will occur due to the control error, and an imbalance of the load cannot be avoided. Also, when emergency braking is applied due to a power failure etc., the speed of both hoisting machines will not be equal due to the difference in brake application timing of both hoisting machines, brake torque rising error, frictional difference of brake lining, etc. Extreme load imbalance can occur.
FIG. 8 shows a conventional elevator drive system. The same reference numerals as those in FIGS. 5 and 6 denote the same components. That is, two hoisting machines (consisting of a motor 1a, a brake 2a, a sheave 3a, and a motor 1b, a brake 2b, and a sheave 3b) are arranged for one car 6. Reference numerals 10 and 11 denote movable pulleys provided at the upper and lower parts of the car 6, and the suspension rope 5 and the compensation rope 8 are suspended respectively. The suspension ropes 5a and 5b shown in FIG. 5 are combined into one suspension rope 5 in FIG. 8, and the suspension ropes 5 are sheaves 3a and 3b of both the hoisting machines, and the deflectors 4a and 4b and the movable pulley. A car 6 is suspended through 10 and both ends thereof are fixed to counterweights 7a and 7b. Further, the compensating ropes 8a and 8b in FIG. 5 are also combined as a compensating rope 8, and both ends thereof are connected to the counterweights 7a and 7b via the compensating rope pulleys 9a and 9b and the movable pulley 11 at the bottom of the car. Has been. That is, the suspension rope 5 and the compensation rope 8 are connected so as to form one loop via the counterweights 7a and 7b.
In the above configuration, the motors 1a and 1b of the two hoisting machines are basically controlled at a uniform speed, and the sheaves 3a and 3b rotate at the same speed in the directions of solid arrows A and B in FIG. The movable pulleys 10 and 11 also basically move up and down without rotating. When a speed difference occurs between the two hoisting machines, for example, when the speed of the sheave 3a is higher than the speed of the sheave 3b during winding, this corresponds to the speed difference between the sheave 3a and the sheave 3b. The elevator moves up and down while rotating in the direction of the dotted arrow in FIG. In addition, the suspension rope 5 and the compensation rope 8 are connected as a single loop via the counterweights 7a and 7b, and the movable pulleys 10 and 11 can be rotated according to the speed difference. The hoisting machine side load of 5 (corresponding to the loads of the ropes 5a and 5b in FIG. 5) is always equalized. In FIG. 8, the motors 1a and 1b of the hoisting machine are installed on the same floor, and the counterweights 7a and 7b move up and down on both ends of the car 6. Therefore, the entrance of the car 6 is the front of FIG. Will be arranged as follows.
In an ordinary elevator arrangement, the counterweight often moves up and down the back side of the car (the side opposite to the car entrance) so that a plurality of elevators are arranged side by side. FIG. 9 shows an embodiment that enables such an arrangement. In FIG. 9, the same reference numerals and the same subscripts denote the same components as those in FIGS. 5 and 8. The motor and brake of the hoisting machine are not shown. Reference numeral 12 denotes a moving pulley provided on the upper portion of the counterweight 7. In this system, two hoisting machines are divided into two upper and lower floors, and the counterweight 7 and the compensating rope pulley 9 are combined into one. Since the counterweights 7 are combined into one, they can be arranged so as to move up and down the back of the hoistway opposite to the car entrance. Both ends of the suspension rope 5 are connected so as to form a loop by itself, and the cage 6 and the counterweight 7 are suspended via the movable pulleys 10 and 12. Due to the action, the load of the hoisting rope of the hoisting machine can be always equalized as in FIG. 8, and therefore the torque of both hoisting machines can be equalized.
8 and 9 show application examples in the case of 1: 1 roping, but show application examples in the case of 2: 1 roping. FIG. 10 shows a configuration in which two hoisting machines are installed on the same floor and the counterweight is divided and arranged on both sides of the car. The same reference numerals and the same subscripts denote the same parts as those in FIGS. . The motor and brake are not shown. Reference numerals 13, 14a, and 14b denote pulleys fixed to building beams or the like. The movable pulleys 10a and 10b installed on the upper portion of the car 6 are divided into two pieces, and the movable pulleys 12a and 12b are attached to the counterweights 7a and 7b, respectively. The suspension rope 5 is connected at both ends so as to form a loop by itself, and the car 6 and the counterweights 7a, 7b are suspended via the movable pulleys 10a, 10b, 12a, 12b. Similarly to the case of 1: 1 roping, even if a speed difference occurs between the sheaves 3a and 3b of the hoisting machine, the rope load and hoisting torque applied to both hoisting machines can be equalized.
FIG. 11 is also a 2: 1 roping application example, in which two hoisting machines are divided into two upper and lower floors and the counterweights 7 are combined into one. In FIG. 11, the same reference numerals and the same subscripts denote the same components as those in FIG. The motor and brake are not shown. Three moving pulleys 10a, 10b, 10c and 12a, 12b, 12c are installed on the upper part of the car 6 and the counterweight 7, respectively, in order to avoid interference with the rope. As shown in FIG. 10, the suspension rope 5 is connected at both ends so as to form a loop by itself, and the movable pulleys 10 a, 10 b and 10 c on the upper side of the car 6, and the movable pulley 12 a on the upper side of the counterweight 7 Since the car 6 and the counterweight 7 are suspended via 12b and 12c, even if a speed difference occurs in the sheaves 3a and 3b of the hoisting machine, the rope load and hoisting torque applied to both hoisting machines are equalized. can do. The effect on the elevator arrangement is the same as in FIG. 9 (see, for example, Patent Document 1).

FIG. 12 shows another conventional example. FIG. 12A shows a schematic configuration inside the hoistway 33, 21 is a passenger car, 23 is a main hoisting machine, 24a, 24b and 24c are auxiliary hoisting machines, 25 is a main sheave, and 26 is A deflecting sheave, 27 is a load detecting device, 28 is a counterweight, 29 is a main rope, 30 is a compensatory rope, 31 is a compensatory sheave, 32 is a counterweight sheave, and 34 is a machine room.
The main hoisting machine 23 and the sub hoisting machine 24 a are arranged in a machine room 34 provided at the upper part of the hoistway 33. The main hoisting machine 23 is fixed vertically above the car 21 and drives a main sheave 25 provided therein. The auxiliary hoisting machine 24a is fixed at a position where interference due to a collision between the car 21 and the counterweight 28 can be prevented, and drives a deflecting sheave 26 provided therein. The auxiliary hoisting machine 24b is fixed to the upper part of the counterweight 28 and drives a counterweight sheave 32 provided therein.
One end of the main rope 29 is fixed to the upper part of the car 21, and the other end is fixed to the upper lower surface of the hoistway 33 through the main sheave 25, the deflecting sheave 26, and the counterweight sheave 32. The main rope 29 suspends the car 21 and the counterweight 28 and balances them.
The auxiliary hoisting machine 24c is fixed to the lower part of the hoistway 33 and drives the compensatory 31 provided therein. One end of the compensation rope 30 is fixed to the lower portion of the car 21, and the other end is fixed to the lower portion of the counterweight 28 via the compensation sheave 31. Thus, by forming one loop with the main rope 29 and the compensation rope 30, the influence of unbalance due to the weight of the main rope 29 is offset.
FIG. 12B shows a drive control system, 32 is a control device, 36 is an electric motor that drives the main sheave 25 of the main hoisting machine 23, 37 is a drive circuit that drives the electric motor 36, and 35 is an electric motor 36. It is a rotation speed detection apparatus which detects the rotation speed of this. Reference numerals 36a, 36b, and 36c denote electric motors that drive the sheaves of the auxiliary hoisting machines 24a, 24b, and 24c, and reference numerals 37a, 37, and 37c denote drive circuits that drive the electric motors 36a, 36b, and 36c, respectively. Reference numerals 35a, 35b, and 35c denote rotational speed detection devices that detect the rotational speeds of the electric motors 36a, 36b, and 36c. Power is supplied from a power source 38 to the drive circuits 37, 37a, 37b, and 37c (see, for example, Patent Document 2).

JP-A-6-64863 JP 2002-145544 A

  The conventional elevator drive system is configured as described above, so if there is a difference in the rope feed distance from the two hoisting machines, the counterweight will shift in position and travel to the terminal floor. Occasionally, it collided with a shock absorber, causing problems such as inability to use and deterioration of passenger comfort due to the collision.

  The present invention has been made in order to solve the above-described problems, and ensures the safety of a system that drives a car with two hoisting machines, while reducing the driving distance of the two hoisting machines. An elevator drive system for balancing is provided.

  An elevator drive system according to the present invention is an elevator drive system in which a car is driven up and down by a plurality of hoisting machines. A difference in drive torque, a difference in rotation speed, or a difference in rotation distance in a plurality of hoists. If the difference is greater than or equal to a predetermined value, an abnormality detection means is provided for determining that an abnormality has occurred. When an abnormality is detected, one hoisting machine or two windings are provided. The lifting drive of the upper machine is stopped.

  As described above, according to the present invention, both ends are connected so that the suspension rope and the compensation rope form one loop, or both ends are connected so that the suspension rope itself forms a loop, and the car or the counterweight is connected. In an elevator configured to suspend a car and a counterweight via a moving pulley provided in the building or a pulley fixed to a beam of a building, torque balance, speed difference, and distance difference between hoisting machines are Even if it occurs, stable performance can be realized.

Embodiment 1 FIG.
1 is a block diagram showing a configuration of an elevator control apparatus according to Embodiment 1 of the present invention.
In FIG. 1, the alternating current of the alternating current power supply 10 is converted into direct current by the converter 20, the direct current voltage is smoothed by the smoothing capacitor 30, and the smoothed direct current is further converted by the inverter 40 into alternating current of variable voltage / variable frequency. . This alternating current is supplied to an induction motor (IM) or a permanent magnet type synchronous motor (PM) 60 to drive the motor 60 at a variable speed. The hoisting machine 70 is rotated by the rotating operation of the electric motor 60, and the elevator car is moved up and down. Furthermore, the hoisting machine 70 is provided with an electromagnetic brake 75 that holds the hoisting machine stationary when the elevator stops. Reference numerals 50, 51, and 52 denote current detectors.
Next, each configuration and operation of the control unit for outputting the PWM pulse to the inverter 40 and driving the electric motor 60 will be described.
Reference numeral 100 denotes an operation control means for controlling the operation of the elevator. In order to control the operation of the elevator to the target floor in accordance with the call generated from the landing or the use floor generated from within the car, the speed of the car is set to the motor speed. The converted speed command ωr * is output.
110 is a speed control means for outputting a torque command τ * required for the motor speed ωr detected by the speed detector 115 to follow the speed command ωr * issued from the operation control means 100, and 120 is a torque command τ *. This is torque control means for calculating a current flowing through the electric motor 60 and an angular frequency thereof so that a corresponding torque is generated in the electric motor 60.
Reference numeral 140 denotes torque / excitation current detection means. From the three-phase primary currents iu, iv and iw detected by the current detection means 50 to 52, the excitation component current Im and the torque component current It are expressed by equations (4) to (4). Calculate according to 6).
A current control unit 130 operates so that the torque current It and the excitation current Im corresponding to the combination of the torque current command It * and the excitation current command Im * flow inside the induction motor 60.
Specifically, first, the voltage commands Vd * and Vq * for each axis are calculated so that the deviation between the excitation current command Im * and the excitation current Im and the deviation between the torque current command It * and the torque current It is zero. To do. Next, the calculated d-axis voltage command Vd * and q-axis voltage command Vq * are converted into three-phase AC voltage commands vu *, vv *, and vw * (three-phase / two calculated by the torque / excitation current detecting means 140). Corresponds to reverse phase conversion) and output.
Reference numeral 150 denotes PWM pulse generation means for outputting a PWM pulse corresponding to the AC voltage commands vu *, vv *, and vw * to control the inverter 40. As a result, a terminal voltage that generates a torque corresponding to the torque command is generated at the terminal of the inverter 40, and the electric motor 60 can be driven. The structure of the speed control and torque control means is the same in both the induction motor and the permanent magnet type synchronous motor.
Reference numeral 200 denotes a drive deviation abnormality detecting means, which is a difference between two drive torques, that is, a difference in torque current It, a difference in rotational speed, that is, a difference in motor speed ωr, or a difference in rotational distance, that is, motor speed. One of the differences in the integral value S of ωr or a combination thereof is detected, and if the difference is equal to or greater than a predetermined value, an abnormality detection means is provided for determining that an abnormality has occurred. The output of the PWM pulse generating means 150 is stopped in order to stop the raising / lowering drive of the machine or the two hoisting machines. If one hoisting machine is stopped, there is no difference in the raising / lowering driving of the two hoisting machines, and the raising / lowering driving is possible with the other hoisting machine.
Further, in order to stop the raising / lowering drive of the two hoisting machines, it is necessary to stop the output of the PWM pulse generating means 150 and to close the brake 75 of the hoisting machine 70 to stop the car.

Embodiment 2. FIG.
FIG. 2 is a block diagram showing a configuration of an elevator control apparatus according to Embodiment 2 of the present invention. In the figure, the same reference numerals as those in FIGS. 1 and 8 denote the same parts, and the description thereof will be omitted.
In FIG. 2, reference numeral 210 denotes a counterweight position correcting means, a means for storing a predetermined position of the counterweight on each floor, a detecting means for detecting that the position of the counterweight deviates from the stored value, and the deviation detection value. Is constituted by correction control means for instructing each of the operation control means 100 for a correction distance for correcting a difference in rotational distance between the two hoisting machines. The correction distance is corrected by adding and subtracting the distance shifted from the predetermined position of the counterweight on each floor to the travel distance of each operation control means 100. The position of the counterweight is measured by the rotational distance of the upper pulley via a rope connected to the counterweight.

Embodiment 3 FIG.
FIG. 3 is a block diagram showing a configuration of an elevator control apparatus according to Embodiment 3 of the present invention. In the figure, the same reference numerals as those in FIGS. 1 and 2 indicate the same parts, and the description thereof will be omitted.
In the third embodiment, as shown in FIG. 3, the position of the counterweight can be regarded as the amount of deviation of the counterweight by the difference between the rotation distances of the hoisting machines, that is, the integral value S of the motor speed ωr. Therefore, the amount of deviation of the counterweight is input to the counterweight position correcting means 210.

Embodiment 4 FIG.
4 is a block diagram showing a configuration of an elevator control apparatus according to Embodiment 4 of the present invention. In the figure, the same reference numerals as those in FIGS. 1 and 2 indicate the same parts, and the description thereof will be omitted.
As shown in FIG. 4, in an elevator drive system in which a car is lifted and lifted separately by a plurality of hoisting machines with a hoisting rope, 6a is a rail, and 6c is a load detected from the car to the rail. A load detector, 6b is an inclination angle detector for detecting the level of the car, and 220 is a torque balance abnormality detecting means.
The torque balance abnormality detection means 220 detects the inclination of the car with the inclination angle detector 6b, or detects the eccentric load from the car to the rail with the load detector 6c. When detecting an abnormality, the output of the PWM pulse generating means 150 is stopped in order to stop the raising / lowering drive of the two hoisting machines.
Further, in order to stop the raising / lowering drive of the two hoisting machines, it is necessary to stop the output of the PWM pulse generating means 150 and to close the brake 75 of the hoisting machine 70 to stop the car.

Embodiment 5 FIG.
FIG. 5 is a block diagram showing a configuration of an elevator control apparatus according to Embodiment 5 of the present invention. In the figure, the same reference numerals as those in FIGS. 1 and 2 indicate the same parts, and the description thereof will be omitted.
In FIG. 5, 6a is a rail, 6c is a load detector that detects an unbalanced load from the car to the rail, 6b is an inclination angle detector that detects the level of the car, and 230 is a torque balance correcting means. The torque balance correcting means 230 detects the inclination of the car with the inclination angle detector 6b, or detects the eccentric load on the rail from the car with the load detector 6c, so that it can be eliminated. It is composed of correction control means for instructing each operation control means 100 to provide a correction distance for correcting the difference in rotational distance, and the correction distance is corrected by adding and subtracting the correction distance to the travel distance of each operation control means 100.

It is a block diagram which shows the structure of the control apparatus of the elevator in Embodiment 1 of this invention. It is a block diagram which shows the structure of the control apparatus of the elevator in Embodiment 2 of this invention. It is a block diagram which shows the structure of the control apparatus of the elevator in Embodiment 3 of this invention. It is a block diagram which shows the structure of the control apparatus of the elevator in Embodiment 4 of this invention. It is a block diagram which shows the structure of the control apparatus of the elevator in Embodiment 5 of this invention. It is a basic composition figure showing the drive system of the conventional 1: 1 roping elevator. It is a basic block diagram which shows the drive system of the elevator by the conventional winding machine. It is a block diagram which shows the drive system of the elevator by the conventional 2 winding machines. It is a block diagram which shows the drive system of the elevator by the conventional 2 winding machines. It is a block diagram which shows the drive system of the elevator by the conventional 2 winding machines. It is a block diagram which shows the drive system of the elevator by the conventional 2 winding machines. It is a block diagram which shows the drive system of the elevator by the conventional multiple winding machine.

Explanation of symbols

6a Rail 6c Load detector 6b Inclination angle detector 10 AC power supply 20 Converter 30 Smoothing capacitor 40 Inverter 50, 51, 52 Current detector 60 Electric motor 70 Hoisting machine 75 Electromagnetic brake 100 Operation control means 110 Speed control means 120 Torque control means 130 Current control means 140 Torque / excitation current detection means 150 PWM pulse generation means 200 Drive deviation abnormality detection means 210 Balance weight position correction means 220 Torque balance abnormality detection means 230 Torque imbalance correction means

Claims (7)

In an elevator drive system in which a car is driven up and down by a plurality of hoisting machines,
Provided with an abnormality detection means for detecting any of a difference in driving torque of a plurality of units, a difference in rotational speed, a difference in rotational distance, or a combination thereof, and determining that an abnormality is detected if the difference is a predetermined value or more. ,
An elevator drive system characterized by stopping the raising / lowering drive of one hoisting machine or two hoisting machines when an abnormality is detected. Two hoisting machines and two counterweights are arranged, the suspension rope and the compensation rope are connected to each other via a counterweight so as to form one loop, and the two hoisting machines and the movement provided on the upper part of the car Configure the car and counterweight to hang through a pulley, or install two hoists separately at different heights and tie both ends so that the suspension rope loops itself Connected and configured to suspend the car and counterweight via two hoisting machines and moving pulleys provided on the upper part of the car and the upper part of the counterweight, so that the car is driven up and down by the two hoisting machines. In the elevator drive system
There is an abnormality detection means that detects either a difference in driving torque between two units, a difference in rotational speed, a difference in rotational distance, or a combination, and determines that an abnormality is detected if the difference is equal to or greater than a predetermined value. ,
An elevator drive system characterized by stopping the raising / lowering drive of one hoisting machine or two hoisting machines when an abnormality is detected. Two hoisting machines and two counterweights are arranged, the suspension rope and the compensation rope are connected to each other via a counterweight so as to form one loop, and the two hoisting machines and the movement provided on the upper part of the car Configure the car and counterweight to hang through a pulley, or install two hoists separately at different heights and tie both ends so that the suspension rope loops itself Connected and configured to suspend the car and the counterweight via two hoisting machines and a moving pulley provided on the upper part of the car and the upper part of the counterweight, so that the car is driven up and down by the two hoisting machines. In the elevator drive system
There is an abnormality detection means that detects either a difference in driving torque between two units, a difference in rotational speed, a difference in rotational distance, or a combination, and determines that an abnormality is detected if the difference is equal to or greater than a predetermined value. ,
An elevator drive system characterized in that when an abnormality is detected, the lifting and lowering driving of the two hoisting machines is stopped and the brakes of the two hoisting machines are operated and stopped. Two hoisting machines and two counterweights are arranged, the suspension rope and the compensation rope are connected to each other via a counterweight so as to form one loop, and the two hoisting machines and the movement provided on the upper part of the car Configure the car and counterweight to hang through a pulley, or install two hoists separately at different heights and tie both ends so that the suspension rope loops itself Connected and configured to suspend the car and the counterweight via two hoisting machines and a moving pulley provided on the upper part of the car and the upper part of the counterweight, so that the car is driven up and down by the two hoisting machines. In the elevator drive system
The position of the counterweight on each floor is set to a predetermined position, and a correction control means for detecting that the position of the counterweight deviates from the set value and correcting the difference in rotational distance between the two hoisting machines. An elevator drive system comprising:   The elevator drive system according to claim 4, wherein a shift in the position of the counterweight is indirectly detected based on a difference in rotational distance between the two hoisting machines. In an elevator drive system in which a car is hung separately with a hoisting rope by a plurality of hoisting machines and driven up and down,
Detects the inclination of the car or the unbalanced load on the rail from the car, and if it is above a predetermined value, it is equipped with an abnormality detection means that determines that it is abnormal, and stops the hoisting drive when the abnormality is detected A drive system for the Shiba-beta. In an elevator drive system in which a car is hung separately with a hoisting rope by a plurality of hoisting machines and driven up and down,
An elevator drive system comprising torque balance correcting means for detecting an inclination of a car or an unbalanced load on the rail from the car and correcting the output torque of a plurality of hoisting machines so as to eliminate it.

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