JPH05201632A - Elevator control equipment - Google Patents

Abstract

(57) [Summary] (Modified) [Objective] The present invention provides a control device for an elevator that does not use a compensating chain and electrically controls the balance between the load on the car side and the load on the counter weight to prevent jumping out and fishing drop. The purpose is to provide. [Structure] A detection circuit 19 for detecting a car position, a calculation circuit 20 for calculating an unbalance amount of a load from a weight difference between a main rope and a tail cord according to the position, and a conversion circuit 21 for a torque amount of a motor for canceling the unbalance amount. When,
A holding circuit 23 that holds the torque amount constitutes an elevator control device.

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.

[0002]

2. Description of the Related Art A standard structure of a rope type elevator is shown in FIG. 1 is the main sheep, 2 is the deflecting sheep, 3
Is the main rope, 4 is the basket, 5 is the counterweight,
Reference numeral 6 is a tail cord that relays a car and a power supply and a control signal.

Normally, the counterweight 5 is set to a weight that balances the car with a load of about half the rated load of the car. Therefore, if the number of passengers is less than half of the rated load, the counterweight is heavier, and if the number of passengers is more than half, the car is heavier. For this reason, when the weight difference (unbalanced load) between the car 4 and the counterweight 5 becomes large, when the brake is opened, fishing drop or jumping occurs, which adversely affects riding comfort and safety.

In order to prevent this, conventionally, load compensation control has been performed in which the load in the car is detected and a torque commensurate with the unbalanced load is electrically applied to the motor to compensate the unbalanced load. However, the weight of the main rope and the tail cord for fishing the basket cannot be neglected if the up-and-down stroke becomes long. The unbalance amount Wub (x) is given by the equation (1). Wub (x) = (2r- (TC./2)) x (1) r; unit weight kg of main rope, T.W. C: unit weight of tail cord kg, x; distance m from the position where the car and the counter weight are balanced on the middle floor. Generally, the main rope 3 is heavier than the tail cord 6, so (2) of the formula (1) The-(TC./2)) term is a positive value, so the amount and direction of the imbalance changes depending on the car position. Therefore, even if the car 4 and the counterweight 5 are balanced, the counterweight side becomes heavier on the uppermost floor and the car side on the contrary on the lowermost floor by the weight shown in the equation (1). If this amount of unbalance becomes large, it causes fishing-off or jumping out, similar to the unbalanced load due to the loading of the car. In order to prevent this, the compensating chain 7 and compensating sheave 30 shown in FIG. 4 are provided on the tail cord side so that the term (2r- (TC./2)) in the equation (1) becomes zero when the lifting stroke is long. It was provided to compensate for the amount of unbalance. Also, as in the case of load compensation, a method of electrically compensating has been proposed. This is for compensating the unbalance amount by calculating the unbalance amount obtained from the equation (1) from the position signal of the car and giving a torque signal corresponding to this to the motor. The structure is shown in FIG. 8 is a speed reference pattern generation circuit, 9 is a speed control amplifier ASR, 10 is an adder, 11 is a vector control arithmetic circuit of an AC motor, 12 is a current control amplifier ACR, 13
Is an inverter driver, 14 is an inverter, 15 is a motor current detector, 16 is an induction motor, 17 is a pulse generator, 18 is an F / V converter, 19 is a car position detection circuit, 20 is a compensation amount calculation circuit, and 21 is A D / A converter, 22 is a car load detection circuit, and 23 is a data holding circuit.

A pulse generator in which the speed of the elevator is directly connected to the motor 16 so as to follow the speed reference pattern 8.
The signal is fed back as a signal from 17 through the F / V converter 18, and is controlled by the speed amplifier 9 so that it is matched with the speed reference pattern and the deviation becomes zero. The compensator compensation amount calculation circuit 20 calculates the compensation amount by receiving the signal of the output of the in-car load detection circuit 22 held by the data holding circuit 23 and the output of the car position detection circuit 19 from the output of the speed amplifier 9 The signals passed through the / A converter 21 are added. This added signal becomes the motor torque command and the vector control arithmetic circuit
At 11, it is converted to a three-phase current reference. This is matched with the signal from the motor current detector 15 and controlled by the current amplifier 12 so that the deviation becomes zero. The output of the current amplifier becomes a drive signal for the inverter 14 through the driver 13, and the motor 16 is controlled.

[0006]

However, in the case of the above-mentioned method, the amount of compensation must be calculated and compensated for during the elevator operation, and the car may be erroneously counted by the pulse generator, or the signal line may not be properly contacted or broken. If the position signal is incorrect, an error occurs when calculating the compensation amount, or if the compensation amount is disturbed by noise, etc., the motor torque will fluctuate, causing vibrations and making the ride less comfortable. There was a risk that the motor current would increase and the overcurrent protection would operate.

SUMMARY OF THE INVENTION It is an object of the present invention to provide an elevator control device which eliminates the above-mentioned problems and enables electrically stable control without attaching a compensating chain, and which does not pop out or catch over.

[0008]

[Means for Solving the Problems] A detection circuit for detecting a car position, a calculation circuit for calculating an unbalance amount of a load from a weight difference between a main rope and a tail cord by the position, and a torque amount of a motor for canceling the unbalance amount. An elevator control device is constituted by a conversion circuit for converting into an electric field and a holding circuit for holding the torque amount.

[0009]

[Function] When the elevator stops on the floor, the motor torque amount that cancels the unbalance amount calculated from the position of the car is calculated, the amount is held, and the elevator starts operating again and arrives at the destination floor in this state. To do. When stopped, the holding is stopped, the motor torque corresponding to the car position on the floor is calculated again, this value is held before departure, and then the next operation is started.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment according to the present invention will be described with reference to the drawings. An embodiment of the present invention is shown in FIG. 1, those parts that are the same as those shown in FIG. 5 are designated by the same reference numerals, and a description thereof will be omitted.

The output of the D / A converter 21 is not the output of the speed amplifier 9 but the input side of the data holding circuit 23. Further, FIG. 2 shows a configuration diagram of the data holding circuit 23. 24 and 25 are operational amplifiers, 26 is a field effect transistor (FET) used as an electric switch, 27 is a resistor, and 28 is a capacitor. Next, the operation of the elevator control device based on the above configuration will be described. It is the amount of motor torque that cancels the amount of unbalance calculated from the car position.

By adding the output of the D / A converter 21 to the output of the in-car load detection circuit 22 and inputting it to the data holding circuit 23, the unbalanced load generated by passengers getting on and off when the elevator is stopped is in the car. The output of the load detector 22 compensates, and the unbalance amount due to the main rope and the tail cord is compensated by the output of the D / A converter 21. By holding this before starting and starting the elevator, no imbalance occurs. It is possible to prevent jumping out and fishing out.

As the holding circuit, the compensation amount is input from the positive side input terminal of the operational amplifier 24 in FIG. 2, the FET 26 is made conductive during the stop, and the input signal is charged in the capacitor 28. Before the start, the FET 26 is turned off. By making it conductive, the input signal is held and output from the output pin of the operational amplifier 25.

However, in this method, the unbalance amount on the main rope and the tail cord is maintained during operation, so there is no unbalance at the start, but the unbalance amount increases as the car moves, but during operation The speed amplifier 9 and the current amplifier 2 are controlled so as to electrically compensate for this unbalance amount and follow the speed reference. This response speed is sufficiently faster than the response speed of the elevator mechanical system, so there is no problem. Therefore, if the amount of imbalance is compensated for when the elevator starts, it can be compensated in a controllable manner even after a slight change, which is not a practical problem.

As described above, the present invention makes it possible to realize a control circuit which is almost the same as the conventional one and which is free from popping and catching, and the compensation amount is read and held when the elevator is stopped on the floor. Because it is good, there is no need to calculate or read compensation amount during elevator operation.
For this reason, there is no concern that the compensation amount will be disturbed due to disturbance or trouble and vibration or the like will occur during operation, and there is no need to constantly calculate the compensation amount, so that the device and processing can be simplified. Further, the compensation amount memory 29 shown in FIG. 3 can be used instead of the compensation amount calculation circuit 20 of FIG.

That is, since the compensation amount is read only when the floor is stopped, the value is a fixed value for each floor. Therefore, it is possible to calculate it in advance without storing it individually and store it in the memory 29. The same effect can be obtained by outputting the value corresponding to the floor signal.

[0017]

According to the present invention, it is possible to provide an elevator control device that can compensate for an unbalance amount without using a compensating chain, simplify the configuration and signal processing, and is not affected by disturbance or the like.

[Brief description of drawings]

FIG. 1 is a block diagram showing the configuration of an elevator control device according to an embodiment of the present invention.

FIG. 2 is a circuit diagram of a holding circuit used in the elevator control device of the present invention.

FIG. 3 is a circuit diagram when a compensation amount memory is used instead of the compensation amount calculation circuit used in the elevator control device of the present invention.

FIG. 4 is a configuration diagram of an elevator.

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

[Explanation of symbols]

 8 ... Speed reference pattern circuit 17 ... Pulse generator 19 ... Car position detection circuit 20 ... Compensation amount calculation circuit 21 ... D / A converter 22 ... Car load detection circuit 23 ... Data holding circuit

Claims (2)

[Claims] 1. A detection circuit for detecting the position of the car in a car for electrically compensating an unbalance amount caused by a weight difference between a main rope and a tail cord depending on the position of the car of a rope type elevator, A calculation circuit for calculating the unbalance amount, a conversion circuit for inputting the unbalance amount and converting the motor torque to cancel it, and a holding circuit for holding the signal,
An elevator control device characterized by controlling a motor of a hoisting machine by using an output signal of the holding circuit. 2. A detection circuit for detecting the position of the car, wherein the unbalance amount caused by the weight difference between the main rope and the tail cord depending on the position of the car of the rope type elevator is electrically compensated without using a competition chain. , A storage circuit that stores the unbalance amount calculated in advance at the car position, a conversion circuit that inputs the unbalance amount and converts the motor torque that cancels it, and a holding circuit that holds the signal The elevator control device is characterized by controlling the motor of the hoisting machine by using the output signal of the holding circuit.