JP2002087722A - Driving auxiliary device for elevator, and landing level adjusting method using the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a driving auxiliary device for an elevator capable of easily and safely adjusting comfortableness without using a heavy weight. SOLUTION: When a worker adjusts the comfortableness of the elevator, the elevator is operated in the zero state of load mass in a car, and a motor 14 of a counterweight 4B is controlled. Specified mass unbalance is artificially created between the counterweight 4 and the car 1 by adding lifting force equivalent to assigned mass, to the counterweight 4. Comfortableness adjusting work can thereby be performed while making an apparent change of car load without preparing a conventional weight.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an elevator driving assist device and a landing level adjusting method using the same.

[0002]

2. Description of the Related Art In general, a hanging elevator has a system configuration shown in FIG. The bottom of the car 1 is supported by a car frame 1A and has a double structure. A linear former 7 as a load sensor is installed between the bottom 12 of the car 1 and the lower part of the car frame 1A, and detects a load applied to the bottom 12 of the car 1 by this.

[0003] The car frame 1A and the counterweight 4B are suspended by a rope 2, and the hoisting machine 3 and the rope 2 raise and lower the car frame 1A and the counterweight 4B in a sliding manner. The car 1 supported by the vehicle also moves up and down. In the present specification, when it is not necessary to distinguish between the operation of the car 1 and the operation of the car frame 1 </ b> A, they are regarded as one and described as the operation of the car 1.

The main power supply 100, the motor 5 and the control device 6
The operation of the car 1 is controlled by controlling the drive of the hoisting machine 3. The control device 6 includes a gain control unit 11 that controls the motor gain based on the weight of the load in the car detected by the linear former 7. The brake 10 works when the elevator stops, and fixes the car 1 at the stop position. It is opened during running. Also, the battery 20A
Is a power supply for rescue operation for backing up the main power supply and performing a rescue operation when the main power supply fails.

The car 1 moves up and down along the car side guide rails 17 in the hoistway 51. At a predetermined position of the guide rail 17, a landing plate 19 is attached so that the floor surface 12 of the car 1 can land on the same level as the floor surface of the elevator platform, and a landing switch 18 is provided on the car 1 side. Is attached. Balancing weight 4B that moves up and down in the opposite direction to car 1
Are guided by the guide rail 8.

Conventionally, in the ride comfort adjusting operation of such a lift-type elevator, a weight corresponding to the mass of the passenger is loaded in the car 1. Car 1
Although the linear former 7 that detects the mass in the car with respect to the vehicle normally outputs a constant voltage value, the weight of the car 12 is bent by placing a weight in the car 1, and the car floor 12 is displaced by the amount of bending. Move between the windings fixed to the car frame 1A side, thereby changing the voltage of the windings. Therefore, the voltage value is input to the gain control unit 11 installed in the elevator control device 6 through the tail cord 52, and the gain is adjusted for the mass (load) in the car, thereby adjusting the ride comfort of the elevator. It is. And this gain adjustment is 0%, 25%, 50%, 75% of the capacity of the car.
% And different loads.

[0007]

In the ride comfort adjusting operation of such a conventional elevator, a weight for applying a load is arranged in the car, so that a building under elevator construction is made of an iron made of about 20 kg. Dozens of weights have to be collected on a trolley, and weights of several hundreds to several thousand kg have to be placed in the vicinity of the elevator landing, which has a problem in space. In addition, these weights can be reused at other sites, but on the other hand, they require space for storage, and must be transported as heavy goods to the storage location, which also has a problem in the transportation method. .

[0008] Further, during the loading and unloading work of the weight,
There were also the dangers that workers could have their hands or feet caught between the weight and the car floor, and the weight could hit the building and damage the building. In addition, this operation requires several tens of minutes of loading / unloading time per car, which is problematic in terms of cost.

SUMMARY OF THE INVENTION The present invention has been made in view of such a conventional problem, and an object of the present invention is to provide an elevator drive assist device capable of easily and safely adjusting a ride comfort without using a heavy weight. Aim.

Another object of the present invention is to provide an elevator driving assist device capable of reliably performing a rescue operation even when the load in the car and the balance weight are mass-balanced.

Another object of the present invention is to provide a method of adjusting a landing level using the above-described elevator drive assist device.

[0012]

The invention according to claim 1 is an elevator in which a car frame and a suspended weight are suspended at both ends of a suspension rope and these are lifted and lowered in a hoisting manner by a hoist. Inside the car so as to support the bottom of the car, and a load sensor for detecting the load of the car is attached between the lower part of the car frame and the bottom of the car,
In an elevator that controls a driving force of the hoist based on a load detected by the load sensor by a control device,
A guide roller mounted on the counterweight and rolling while pressing against a guide rail that guides the counterweight in a predetermined direction, and changing the apparent mass of the counterweight by rotating the guide roller. A motor, a motor control circuit for controlling the motor, and input means for inputting a load command to the motor control circuit, wherein the motor control circuit generates a load command corresponding to the load command input by the input means. The present invention is characterized in that the motor is driven so as to raise the counterweight, and a pseudo mass imbalance is created between the cars.

In the elevator driving assist device according to the first aspect of the present invention, when the operator adjusts the riding comfort of the elevator, the elevator is operated with the loaded mass in the car being zero, and the motor of the counterweight is used. By controlling
By applying a lifting force corresponding to the designated mass to the counterweight, a predetermined mass imbalance is artificially created between the cars.

As a result, the ride comfort can be adjusted while apparently changing the car load without preparing a conventional weight.

According to a second aspect of the present invention, in the elevator driving assist device of the first aspect, the motor for driving the guide roller is detachable from the counterweight, and the operation of adjusting the ride comfort of the elevator is completed. For example, it can be reused to perform the same work at another site, and cost can be reduced.

According to a third aspect of the present invention, in the elevator driving assist device according to the first or second aspect, the guide rail, the guide roller, and the motor are formed by a linear motor drive system, and the linear motor drive system has a long linear movement distance. Ride comfort adjustment work of the car can be performed smoothly.

According to a fourth aspect of the present invention, in the elevator driving assist device of the first aspect, when the power supply is lost, the first battery for supplying power to the control device for controlling the operation of the car and the brake of the hoisting machine. And a second battery for supplying power to the motor when power is lost, wherein the motor control circuit supplies power to the motor with the second battery when power is lost, Is driven to rotate in a rotation direction necessary to move to the nearest floor, and a rescue operation is performed.

In the elevator driving assist device according to the fourth aspect of the present invention, as an emergency rescue operation in the case where the main power supply is interrupted in the lift-type elevator, the motor on the counterweight side is driven by the second battery and is driven via the guide roller. By driving the counterweight and moving the opposite car to the nearest floor, the trapped passengers can be rescued.

According to a fifth aspect of the present invention, in the elevator driving assist device of the fourth aspect, the motor control circuit performs the rescue operation only when the counterweight and the car are in mass balance. When the counterweight and the car are mass balanced and the car cannot be moved by its own weight even when the brakes are released, the counterweight is moved by the battery power source and the opposite car is moved to the nearest floor. Rescue driving method can be adopted. Thereby, the battery capacity can be reduced to a necessary minimum.

According to a sixth aspect of the present invention, there is provided a method for adjusting a landing level.
The elevator driving assist device according to claim 1, wherein the landing level is adjusted by the expansion and contraction of the suspension rope when the car is stopped with the door open, while applying a predetermined load by the motor control circuit of the counterweight. .

According to a sixth aspect of the present invention, there is provided a method of adjusting a landing level, wherein the elevator driving assist device of the first aspect is used to balance the level adjustment at the time of landing and drive the guide roller by a motor control circuit on the weight side. This eliminates the need to carry the weight into the car and apply the load as in the related art, thus making the adjustment work simple and easy.

[0022]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below in detail with reference to the drawings. 1 and 2 show the configuration of the first embodiment of the present invention. In the hanging elevator of this embodiment, the car 1 is suspended by the hoisting machine 3 and the rope 2 in the hoistway 51, and the weight 4B is suspended, and both lift and lower in a hanging manner.

The main power supply 100, the motor 5 and the control device 6 control the operation of the car 1 by controlling the drive of the hoisting machine 3. The control device 6 includes a gain control unit 11. The brake 10 is controlled by the control device 6 and works in a fail-safe manner when the elevator stops to fix the car 1 at the stop position and release the car 1 when the car 1 travels.

The car 1 is housed in a car frame 1A,
A linear former 7 similar to the conventional example is attached between the bottom portion 12 and the car frame 1A, and this detection signal is input to the gain control section 11 of the elevator control device 6 via the tail cord 52. The car 1 moves up and down along the car side guide rails 17. At a predetermined position of the guide rail 17, a landing plate 19 is attached so that the floor surface 12 of the car 1 can land on substantially the same level as the floor surface of the elevator platform. 18 is attached.

The counterweight 4 B, which moves up and down in the hoistway 51 in the direction opposite to that of the car 1, is guided by the guide rail 8. The guide roller 9 is pressed against the guide rail 8 by a spring 15, so that the counterweight 4B can be independently moved by its rolling. The guide roller 9 is driven to rotate by a motor 14, and the motor 14 is controlled by a motor driving unit 21. The counterweight 4B, the guide rail 8, the guide roller 9, the motor 14, and the motor driver 2
1 constitutes a counterweight device 4A.

Reference numeral 22 denotes a power supply path for supplying electric power to the motor 14. Further, a weight compensation rope (compensation rope) 13 is connected between the floor 12 of the car 1 and the lower part of the balance weight 4B.

Next, the operation of the elevator having the above configuration will be described with reference to FIG. FIG. 3 schematically shows the weight relationship between the car 1 and the balance weight device 4A. The balancing weight device 4A calculates the mass Wcw from the mass Wc of the car 1 and the mass Wt at the time of capacity.

## EQU1 ## Wcw = Wc + 0.5Wt is set.

The following table 1 shows an example of the mass capacity Wt, the car mass Wc, and the counterweight mass Wcw for the six-seater and the fifteen-seater elevators.

[0029]

[Table 1] Conventionally, when adjusting the ride comfort, a weight corresponding to the passenger mass Wp was carried to the car 1 to optimize the vibration and noise. In the case of a smooth elevator, however, the mass unbalance between the car 1 and the counterweight 4B was used. Since the load of the motor 5 that drives the hoist 3 is determined by the balance amount, the same ride comfort can be adjusted by creating this mass unbalance amount by some other method.

For this purpose, the mass of the counterweight 4B may be apparently reduced. For example, to virtually create one passenger, the balancing weight 4B is equivalent to one passenger (about 65 kg).
It just needs to be light. Therefore, when driving a six-seater elevator for ride comfort adjustment, Wcw = 8
If 25 kg moves 760 kg (= 825 kg-65 kg), ride comfort can be adjusted without putting a weight on the car 1. In the case of adjusting the ride comfort of six passengers, 375 kg (= 825 kg-450
The weight on the balance weight device 4A side may be apparently reduced so as to make the movement of (kg).

In order to reduce the apparent mass of the counterweight 4B, the following operation is performed. By driving the hoisting machine 3 to raise and lower the car 1 and the counterweight 4B in a slidable manner, the motor 14 drives the counterweight 4B independently in addition to the normal slidable movement, thereby providing a car The apparent weight balance between the first side and the counterweight 4B can be changed.

For example, while the car 1 and the weight 4B are lifted and lowered in a slidable manner by driving the hoisting machine 3 with the loading load of the car 1 being 0%, the guide roller 9 is driven by driving the motor 14. If the counterweight 4B is rotated in the pulling-up direction, the weight of the counterweight 4B side becomes apparently lighter. The apparent change in the mass of the counterweight 4B can be adjusted by the magnitude of the rotation speed of the guide roller 9 by the motor 14, thereby arbitrarily changing the weight balance between the car 1 and the counterweight 4B. You can do it.

Therefore, when the operator adjusts the ride comfort of the elevator, the elevator control device 6 balances the motor drive unit 21 from the elevator control device 6 while operating the elevator with the load mass in the car 1 being zero. A signal for instructing a driving force corresponding to a predetermined mass to 4A is sent to drive the motor 14 of the counterweight 4A. Then, the load detection signal indicated by the linear former 7 is taken into the gain control section 11, and the gain is corrected.

An example of the drive assist function of this elevator is as follows. When car 1 is stopped,
When no passengers are present, assuming that the output voltage of the linear former 7 in the car 1 is 2 V, the gain control unit 1 of the control device 6
A voltage of 2 V is applied to 1, and the control device 6 generates a drive command to the motor 5 with the passenger mass set to 0 kg.

Generally, the linear former outputs a voltage signal of 0 V when the load is a balanced load (45% of the rated load) and a voltage signal of -2.5 V when the load is 100% of the rated load (mass for the capacity). The amount of change is made to appear linearly with respect to the amount of deflection. Here, the mass is expressed in% because the amount of deflection of the car floor 12 does not indicate the numerical value of the load itself, but the same amount of the car floor 12 when the load is 100%.
This is because the material has such a strength as to be bent (about 5 mm).

The elevator operator assumes a loading mass of 300 kg and sends a mass signal to the control device 6 as a maintenance tool (a small computer that can be carried by the operator, provided with a keyboard and a display device, and stores data of the control device 6 In this case, the control device 6 generates a drive command for instructing the motor drive unit 21 of the counterweight device 4A to instruct a predetermined load.

The motor drive unit 21 supplies power to the motor 14 of the balancing weight device 4A via the power supply path 22, and
4 is driven by a predetermined driving force. Then, the control device 6 takes in the signal detected by the linear former 7 and
In step 1, the gain is corrected. For example, rated mass 600k
g elevator, the above-mentioned loading mass of 300 kg is 50% of the rated mass,

(Equation 2) Thus, the gain control unit 11 corrects the output of the linear former 7 to a voltage of -0.227V.

In the first embodiment, the guide roller 9, the pulley 21, and the motor 14 for driving the counterweight are provided.
In addition, the motor drive unit 21 is configured to be easily detachable (the guide roller 9 and the pulley 21 may be left for smooth movement of the counterweight 4B side), so that maintenance and inspection can be performed at the time of installing the elevator. Occasionally, these can be carried in to adjust the riding comfort of the car 1, and when completed, can be removed and used for work in another place, so that the total cost can be reduced.

For this purpose, if a belt is used together with a speed reduction mechanism as a mechanism for transmitting a rotational force from the motor 14 to the guide roller 9, a technique corresponding to an elevator door opening / closing drive mechanism can be used. By removing, the connection between the two can be easily separated.

The guide roller 9 is driven by the motor 14.
Can be directly driven, and further, a planetary gear mechanism can be used, whereby the size of the apparatus can be reduced.

In this case, the control device 6 uses the motor drive unit 2
The gain control unit 11
Invalidate the mass correction command for. This is because the gain control unit 11 sets the motor drive unit 2
This can be realized by adding one detection signal. This detection signal can be detected by turning on / off a switch attached to the motor drive unit 21. It is also possible to use an optical sensor or use a power detection signal of the motor 14.

Further, the principle of the elevator driving assist device of the present embodiment can be applied to floor level adjustment when the door is stopped.

When passengers get on and off when the car 1 stops, the load mass in the car 1 changes greatly, and the rope 2
Expands and contracts because of the spring structure. At that time, the car floor 12 is shifted in a direction away from the floor level of the elevator platform, so that a step is generated between the floor surfaces, especially for a wheelchair user and a blind person, and also for a general user. There is a risk of getting caught in.

In order to improve this, normally, when approaching the floor, the motor 5 is operated at a low speed to carry out an operation for correcting the variation of the rope 2 (called "wire stretching operation"). I have. However, since this operation drives the motor 5 that can operate at high speed, the linear former 7
In the event of a failure, abnormal operation occurs. So, basket 1
, The stability of the balance control when the door is stopped can be improved by driving the balancing weight device 4A.

When the door of the car 1 is stopped, the rope 2 tends to expand and contract due to a large change in the load mass in the car 1. For this reason, the car floor 12 tends to move away from the floor level of the elevator platform. In general, a 5 mm rope expands and contracts with a change in mass of 100 kg at an ascending and descending stroke of 30 m in an elevator rated at 600 kg. in this way,
When the car 1 moves up and down only when the door of the car 1 is stopped, the landing switch 18 constituted by the optical sensor is disengaged from the landing plate 19 indicating the stop position of the elevator, and the car is displaced by about 10 mm. 1 recognizes that it has deviated from the floor level of the elevator hall.

The control device 6 controls the release of the brake 10,
The guide roller 9 is controlled by controlling the motor 14.
To correct the floor level deviation. Here, the speed is set to a low speed of about 5 m / min, so that passengers cannot understand.

When the motor 14 according to the present embodiment is used only for the correction of the floor level at the time of landing, as long as the motor 14 can correct the expansion and contraction of the rope 2. Because it is good, a small capacity is sufficient. If the capacity is reduced, there is an advantage that an abnormal speed is not generated in the event of a failure.

Next, a second embodiment of the present invention will be described. FIG. 4 shows a structure of a portion of a balancing weight device 4A according to a second embodiment of the present invention. Second
The feature of this embodiment is that a linear motor mechanism is employed as a drive mechanism of the counterweight 4B in the counterweight device 4A. Other components are the same as those of the first embodiment shown in FIGS. 1 and 2, and the common components will be described below using the same reference numerals.

In the second embodiment, instead of the guide roller 9 used in the first embodiment, a rail guide 16 for driving the counterweight 4A by the repulsive force of the permanent magnet along the guide rail 8 is used. Provided, and this rail guide 16
Is provided with an excitation and control circuit 23 which excites magnetism and gives an operation control command to the counterweight 4A.

In the second embodiment, when the ride comfort of the elevator is adjusted, the mass signal to be set to the counterweight 4A by the control device 6 is set in a state where the load mass in the car 1 is set to zero. By controlling the rail guide 16 of the feeding and balancing device 4 </ b> A, the specified mass is applied to the car 1.

By employing such a linear motor mechanism, the movement of the counterweight 4B along the guide rail 8 becomes smooth.

Incidentally, also in the second embodiment,
The balance weight drive mechanism can be attached only during the ride adjustment work, and can be removed when the work is completed.

Next, a third embodiment of the present invention will be described with reference to FIG. If a power failure occurs during the operation of the elevator, the power source for driving the elevator disappears, so that the passengers in the car 1 remain locked in the car 1 until the power is restored. In order to avoid this, the control device 6 has an automatic landing function at the time of a power failure using a battery, automatically drives the car 1 to the nearest floor, and then automatically opens the door of the car 1 to attract passengers. To rescue.
A secondary battery 20A such as a Ni-Cd battery is used for power backup for the rescue operation at the time of power failure.

However, if all the power required for rescue operation during a power failure is to be borne by the power supply backup battery 20A, the larger the elevator capacity, the larger the capacity of the elevator is required. The space becomes large, and the size of the automatic landing device at the time of a power failure increases.

In order to improve this, there has been proposed an apparatus for performing a blackout landing only by opening and closing the brake 10. This is because the sum of the weight of the car 1 and the mass of the passenger (the total load of the car) and the mass of the counterweight 4B are different from each other, and the brake 10 is used in a state of being unbalanced with high probability. Just open the car and the heavier of the load and the balance weight will fall naturally, so when car 1 descends, rescue operation to the nearest floor below, and conversely when car 1 rises It is a method of rescue driving up to the nearest floor.

However, there is a drawback that if a power failure occurs in a state where the total load of the car and the balance weight are completely balanced, rescue operation cannot be performed.

Therefore, in the third embodiment of the present invention,
The problem is solved as follows. In the elevator drive assist device according to the third embodiment, power is supplied to the control device 6 and the brake 10 of the hoisting machine 3 that are necessary for controlling the operation of the counterweight 4B when the main power supply fails. 1A, a battery 20A, a guide roller 9 that rolls along a guide rail 8 that guides the counterweight 4B in a predetermined direction, and drives the counterweight 4B with frictional force, and a motor 14 that drives the guide roller 9 And a second power supply for supplying power to the motor 14 only when the main power supply fails.
Battery 20B. Note that, for the other components, the same components as those in the first embodiment shown in FIGS. 1 and 2 are denoted by the same reference numerals.

In the elevator according to the third embodiment,
The first battery 20A only supplies the control device 6 and the brake 10 of the hoisting machine 3 necessary for controlling the operation of the car 1 with electric power capable of releasing the brake 10, and the electric power for driving the motor 5 is provided. Since it is not required, a device having a small power supply capacity can be adopted. For example, if the brake voltage is 80 V, driving is possible by connecting about 6 3 A / 12 V automotive batteries in series. Also,
The second battery 20B also supplies electric power to the motor 14 of the guide roller 9 at the time of a power failure of the main power supply to apply a driving force to the balancing weight 4B, thereby causing the entire car load and the balancing weight 4B.
Since it is sufficient to supply power as much as possible to the unbalanced state by eliminating the state of balance with the mass of B, a small-capacity one is sufficient. For example, 8A for an elevator rated at 600 kg
This can be implemented by connecting four / 12 V automotive batteries in series.

In the third embodiment, the control device 6 calculates the difference between the total car load and the mass of the counterweight 4B, and the difference is used to rotate the hoist 3 by opening the brake 10. It is possible to adopt a configuration in which the counterweight 4B is driven by the motor 14 only when it is determined that the weight is insufficient (that is, in the balance state).

Thus, the weight 4B is balanced with the full load of the car.
Motor 14 only when the mass of
, The capacity of the drive mechanism itself of the motor 14 can be further reduced.

In the above embodiment, a plurality of batteries 20A and 20B are used. However, if one battery is used and the voltage is boosted by a DC / DC converter, the size can be further reduced.

Any of the above-described embodiments can be equally applied to a machine roomless elevator in which equipment is installed in the hoistway 51.

[0063]

As described above, according to the first aspect of the present invention,
The ride comfort can be adjusted while changing the car mass without preparing the conventional weights.

According to the invention of claim 2, in addition to the effect of the invention of claim 1, the motor for driving the guide roller is made detachable from the counterweight, so that when the ride comfort adjustment operation of the elevator is completed, It can be reused to perform the same work at another site, and costs can be reduced.

According to the invention of claim 3, claim 1 or 2
In addition to the effects of the invention, the guide rail, the guide rollers, and the motor are driven by a linear motor, so that the ride comfort of the car can be adjusted smoothly.

According to the fourth aspect of the present invention, the emergency rescue operation at the time of a power outage of the main power supply can be performed by driving the motor on the balancing weight side with the battery power supply, and the space required for the rescue operation equipment is small. In particular, the present invention is useful for application to an elevator without a machine room where it is difficult to secure a space for an automatic landing device at the time of a power failure. Further, even if the motor for driving the hoist has failed, rescue operation can be performed, and reliability is improved.

According to the fifth aspect of the present invention, when the main power supply fails, the balance weight and the car mass are balanced, and the car is balanced by the battery power only when the car cannot be moved by its own weight even when the brake is released. Since the weight is moved and the car on the opposite side is rescued to the nearest floor, the battery capacity can be minimized and the size can be further reduced.

According to the sixth aspect of the invention, the level adjustment at the time of landing can be performed by driving the guide roller by the motor control circuit on the balance side, and the expansion and contraction of the rope, which is a problem mainly in a high-speed elevator. Can be realized at low cost. Also, the conventional protection device can be omitted,
The reliability of the entire system is improved.

[Brief description of the drawings]

FIG. 1 is a block diagram of an elevator according to a first embodiment of the present invention.

FIG. 2 is a block diagram of a counterweight device according to the embodiment.

FIG. 3 is an explanatory diagram showing a mass relationship between a car and a counterweight in the embodiment.

FIG. 4 is a block diagram of an elevator according to a second embodiment of the present invention.

FIG. 5 is a block diagram of an elevator according to a third embodiment of the present invention.

FIG. 6 is a block diagram of a conventional elevator.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Car 3 Hoisting machine 5 Motor 6 Control device 7 Linear former 8 Guide rail 9 Guide roller 10 Brake 11 Gain control part 13 Compensation rope 14 Motor 16 Rail guide 20A Battery 20B Battery 21 Motor drive part 22 Power supply path 23 Excitation and control circuit

Claims (6)

[Claims] 1. An elevator in which a car frame and a counterweight are suspended at both ends of a hanging rope, and these are lifted and lowered in a slidable manner by a hoist, wherein the car is supported in the car frame to support the bottom thereof. A load sensor for detecting the load of the car is mounted between the lower part of the car frame and the bottom of the car, and the driving force of the hoist is controlled by the control device based on the load detected by the load sensor. In the elevator, a guide roller mounted on the counterweight and rolling while pressing against a guide rail that guides the counterweight in a predetermined direction, and an apparent weight of the counterweight by rotating the guide roller. A motor that changes the mass; a motor control circuit that controls the motor; and an input that inputs a load command to the motor control circuit. Means, the motor control circuit drives the motor so as to pull up the counterweight with a pulling force corresponding to the load command input by the input means, and pseudo-predetermined between the riding cars. A drive assist device for an elevator characterized by creating a mass imbalance of 2. The elevator driving assist device according to claim 1, wherein a motor for driving the guide roller is detachable from the counterweight. 3. The drive assist device for an elevator according to claim 1, wherein the guide rail, the guide roller, and the motor are of a linear motor drive type. 4. A first battery for supplying power to a control device for controlling operation of the car and a brake of a hoist when power is lost, and a second battery for supplying power to the motor when power is lost. The motor control circuit supplies power to the motor by the second battery when power is lost, and rotates the car in a rotation direction necessary to move the car to the nearest floor. The drive assist device for an elevator according to claim 1, wherein the rescue operation is performed by performing the rescue operation. 5. The drive assist device for an elevator according to claim 4, wherein the motor control circuit performs the rescue operation only when the counterweight and the car are mass-balanced. 6. The floor control system according to claim 1, wherein the landing level is adjusted by expanding and contracting the suspension rope when the car is stopped with the door open while applying a predetermined load by the motor control circuit of the counterweight. Landing level adjustment method using an elevator drive assist device.