JPH11139701A - Elevator control device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an elevator control device capable of improving the ride quality even when a combination of a winding machine with an electromagnetic brake is changed. SOLUTION: A control circuit 11 for giving driving commands to a drive circuit 3 of an electric motor 4 is structured to be provided with a brake specification setting circuit 13 for setting an optional one out of plural brake specifications, and a braking time timer counter 15 for giving electric motor driving commands after a brake releasing time period which corresponds to setting of the brake specification by the brake specification setting circuit 13 has elapsed. For each brake specification combined, a starting torque is given to the electric motor in response to the time difference between the time when a brake coil is energized and the time when brake torque is released.

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, and more particularly, to an elevator control device for performing control when an elevator is started.

[0002]

2. Description of the Related Art In general, an electromagnetic brake integrated with a hoist of an elevator has a structure shown in FIG. 4, and a brake wheel 53 is fixed to a rotating shaft 54 directly connected to an electric motor. The rotation of the rotation shaft 54 is stopped by the brake shoe 52 gripping the brake wheel 53. The brake shoe 52 is connected to the middle of a pair of brake levers 50 whose one end is rotatably supported, and the brake shoes 52 perform a gripping or releasing operation with respect to the brake wheel 53 by operating the brake lever 50. I have. Since the other end of the brake lever 50 is constantly pushed in the direction of arrow A by the spring 51, the brake shoe 52 is
To stop the rotation of the motor and the elevator. In addition, the cam 55 formed in an L-shape
The brake lever 50 rotates in the direction of arrow B with the movement in the direction of arrow A to push up the plunger 56, but when the brake coil 57 is energized, the plunger 56 is sucked and lowered. Cam 5 as it descends
5 is rotated in the direction of arrow C, and the brake lever 50 is rotated in the direction of arrow D against the spring 51. Since the brake shoe 52 releases the brake wheel 50 by this rotation, the rotating shaft 54 can be driven by the electric motor to raise and lower the elevator.

FIG. 5 is a diagram showing the overall construction of a conventional elevator control system. A main rope 61 wound around a mesh wheel 60 has a car 62 and a balance 63 attached to both ends thereof. The shaft 54 is connected to the brake wheel 53 and the electric motor 4 shown in FIG. Brake car 53
Is provided with a brake shoe 52, a plunger 56, a brake coil 57, and a spring 51.
The power supply 10 is connected to 7. The diode 58 and the resistor 59 are connected to the brake coil 57 and the normally open contact 9a when the brake current is interrupted by opening the normally open contact 9a.
Is provided to protect the On the other hand, the motor 4 is connected to a three-phase AC power source 1 via a motor drive circuit 3 composed of a thyristor and a transistor and a normally open contact 2 a of an electromagnetic contactor 2. The circuit 11 is connected. The control circuit 11 is connected to a control power supply VB via a start command contact 12.

If a call is generated in the elevator, the start command contact 12 is closed, the control circuit 11 is operated, the electromagnetic contactor 2 is energized, and the normally open contact 2a is closed to drive. While the three-phase AC power supply 1 is supplied to the circuit 3,
The electromagnetic contactor 9 is energized to close its normally open contact 9a, and the power supply 10 is supplied to the brake coil 57. Then
Since the plunger 56 is sucked and the brake wheel 53 is released, an operation command is sent to the drive circuit 3 at a time corresponding thereto, and electric power is supplied to the electric motor 4 so as to generate a rotational torque. The car 62 is started up and down by this rotation torque. The way to start such an elevator is
JP-A-54-35945, JP-A-2-23178
And Japanese Patent Publication No. 7-64493.

[0005]

However, the conventional elevator control apparatus is different from the conventional elevator control apparatus in that a newly installed elevator incorporates a hoisting machine incorporating an electric motor 4 or an electromagnetic brake, and a control circuit 11.
And the combination of the driving circuits 3 is limited, so that the timing from when the driving command is issued to when the driving command for the electric motor 4 is issued can be appropriately selected, and the timing can be fixedly set. In consideration of the construction period, the hoist and the electromagnetic brake utilize the existing equipment, and the control circuit 11
In the case of adopting a renewal method in which the motor 4 is replaced with a control panel equipped with the drive circuit 3 and the inverter is controlled, the specifications of the existing hoisting machine to be diverted are various, and the braking force of the electromagnetic brake is issued after issuing an operation command. The time from when the operation command is issued to when the motor drive command is issued is fixed because the time period until the is canceled depends on the specification. If the timing for generating the torque of the motor 4 and the braking force of the electromagnetic brake are fixed. Since the timing until the release is not matched, the riding comfort at the time of starting the elevator is deteriorated.

[0006] It is an object of the present invention to provide an elevator control device capable of improving ride comfort even when the combination of a hoist and an electromagnetic brake is changed.

[0007]

According to the present invention, in order to achieve the above object, a brake coil is energized by an elevator operation command signal to release a braking force, and an electric motor is driven by an electric motor drive instruction to drive the elevator. In the elevator control device to be operated, brake specification setting means for setting an arbitrary specification from among a plurality of brake specifications, and the electric motor drive command after a brake release time period corresponding to the brake specification set by the brake specification setting means elapses. And a start-up timer means for providing

The elevator control apparatus according to the present invention comprises a brake specification setting means for setting an arbitrary specification from among a plurality of brake specifications as described above, and a brake release corresponding to the brake specification set by the brake specification setting means. Since the start-up timer means for giving a motor drive command after the time limit is provided, the difference between the time when the brake coil is energized and the time when the brake torque is actually released can be given as the brake release time corresponding to the brake specification. As a result, even if the brake specifications are different from those of the existing device and the brake specifications are different, it is possible to always perform the control with a comfortable ride.

[0009]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is an overall configuration diagram of an elevator control device according to an embodiment of the present invention, and the same reference numerals are given to the same components as those in FIG. A weight 63 is connected to a car 62 at both ends of a main rope 61 wound around a mesh wheel 60, and a brake wheel 53 of an electromagnetic brake and an electric motor 4 shown in FIG. Are connected. The brake wheel 53 is provided with a brake shoe 52, a plunger 56, a brake coil 57, and a spring 51, and the power supply 10 is connected to the brake coil 57. A normally open contact 9a is provided between the terminals of the brake coil 57.
A diode 58 and a resistor 59 are provided to protect the brake coil 57 and the normally open contact 9a when the brake current is interrupted by opening the brake current. On the other hand, the electric motor 4
Are connected to a three-phase AC power supply 1 via a drive circuit 3 of a motor constituted by thyristors and transistors and a normally open contact 2a of an electromagnetic contactor 2.

The drive circuit 3 is connected to a control circuit 11 for giving the drive command. The control circuit 11 is connected to a control power supply VB via a start command contact 12. Here, the control circuit 11 includes a brake specification setting circuit 13 which is a brake specification setting means for setting a specification of a brake to be combined from a plurality of brake specifications, and a brake specification set by the brake specification setting circuit 13. Brake release time limit table 1 as storage means for storing the time from when the brake coil 57 is energized to when the braking force is released
4, and a start-up timer counter 15 which is a start-up timer means for measuring a brake release time set by the brake specification setting circuit 13 and providing an electric motor drive command after the brake release time has elapsed.

Generally, the terminal voltage E of the brake coil 57
Has a relationship represented by Expression 20 shown in FIG. 6 when the inductance is L and the resistance is R. The inductance L and the resistance R differ depending on the specifications of the brake coil 57. In this equation, the inductance L is constant until the plunger 56 operates, and the current i of the brake coil 57 is as shown in equation 21 shown in FIG. 6, and the change of this current i with respect to the time t is shown in FIG. A characteristic curve as shown in FIG.

On the other hand, when the brake coil 57 overcomes the spring 51 and attracts the plunger 56, the inductance L changes, and the voltage E becomes the equation 22 shown in FIG.
The first term differential term on the right side of Equation 22 can be rewritten as Equation 23. Here, the air gap dimension X represents the dimension of the air gap of the plunger 56, and L (X) is the inductance L equal to the air gap dimension X.
Is a function of Equation 24 represents the moving speed of the plunger 56, and Equation 25 represents the rate of change of the inductance with respect to the change of the air gap, which is a negative value in this case. Thus, the plunger 56
Is drawn, the change of the current i becomes a characteristic curve shown in FIG. That is, the current i increases from the point 0 to the point (a) in accordance with the relational expression 21 of the current i in FIG.
In accordance with 3, the number decreases from the point (a) shown in FIG. However, when the plunger 56 is completely sucked, the inductance value in that state gradually increases from the point (b) according to the relational expression 22 of the voltage E in FIG. Such a current characteristic of the brake coil 57 and the plunger 5
The operation relationship of No. 6 is also used for performance evaluation of a brake regularly performed in an existing elevator, and the operation time limit for each brake specification is well known.

On the other hand, when the brake coil 57 is deenergized, the brake coil current decreases while flowing back through the diode 58. However, when the plunger 56 is released and the plunger 56 operates, the inductance value changes and the current is reduced. Increase instantaneously. Normally, the brake coil 57
Are connected in series with a resistor 59 and a diode 58 in parallel with the brake coil 57 for coil insulation protection at the time of current interruption, or only one of the resistor 59 and the diode 58 is connected. Therefore, the current change when the brake coil is deactivated is as shown in FIG. 3C. Also when the brake coil is deactivated, the brake braking force is applied after a stop command is generated according to the brake specifications as in the start-up. Although there is a variation in the time period up to, since it can be controlled to almost zero speed like an inverter control elevator,
Even if the brake braking timing is delayed after the generation of the stop command, the ride comfort is not adversely affected.

Next, the operation of the elevator control device shown in FIG. 1 will be described. First, the brake specification to be combined is set by the brake specification setting circuit 13, and the braking release time corresponding to the set specification is preset as a count value of the start-up timer counter 15. Basket 6
When the call No. 2 is registered and the normally open contact 12 of the start command is closed, the brake coil energizing electromagnetic contactor 9 is energized, the normally open contact 9a is closed, and the brake coil current of the brake coil 57 increases. I do. The normally open contact 9b of the electromagnetic contactor 9 energized by the brake coil is also closed, so that the start-up timer counter 15 is operated. When a predetermined time period is counted and a predetermined time has elapsed, the motor drive command of the control circuit 11 is driven. The input to the circuit 3 causes the drive circuit 3 to operate and the motor 4
To generate a driving force. When the driving force is generated in the electric motor 4, the braking force of the brake has already been released, and the car starts to start smoothly. When the brake specifications to be combined are different, if the setting of the brake specification setting circuit 13 is changed, the timer count value of the start-up timer counter 15 is also changed accordingly. As a result, the car can be smoothly started to start, and a comfortable ride can be achieved.

On the other hand, when the car 62 stops to approach a predetermined position on the destination floor, the car starts to decelerate according to the speed command value.
The vehicle gradually decelerates and almost stops at the landing level. Then, a brake deenergizing command is issued and the electromagnetic contactor 9 energized by the brake coil is deenergized, the normally open contacts 9a and 9b are opened, and the brake current starts decreasing as shown at time t2 in FIG. When the brake coil current of the brake coil 57 becomes equal to or less than a predetermined value, the plunger 56 operates to apply a braking force to the brake. This corresponds to the time point t3 in FIG. 2, and the speed of the electric motor 4 at this time has a value close to zero, so that even if the brake braking timing is delayed, it will not adversely affect the riding comfort of the elevator. Absent.

[0016]

As described above, the elevator control apparatus according to the present invention comprises a brake specification setting means for setting an arbitrary one of a plurality of brake specifications, and a brake release time period corresponding to the setting of the brake specification setting means. Since the start-up timer means for giving a motor drive command after the passage of time is provided, it is possible to apply the start-up torque to the motor according to the time difference between the time when the brake coil is energized and the time when the brake torque is actually released for each brake specification to be combined It is possible to make the elevator always comfortable to ride.

[Brief description of the drawings]

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

FIG. 2 is a characteristic diagram showing a relationship between a car speed and a brake coil current of the elevator control device shown in FIG.

FIG. 3 is a characteristic diagram of a brake coil current in the elevator control device shown in FIG. 1;

FIG. 4 is a front view showing a general electromagnetic brake.

FIG. 5 is an overall configuration diagram of a conventional elevator control device.

FIG. 6 is a plan view showing a change in current and voltage of a brake coil in the elevator control device shown in FIG.

[Explanation of symbols]

 Reference Signs List 3 drive circuit 4 motor 10 power supply 11 control circuit 13 brake specification setting circuit 14 braking release time storage device 15 start-up timer counter 57 brake coil

Claims (2)

[Claims] 1. An elevator control device for operating a lift by urging a brake coil by an elevator operation command signal to release a braking force and driving an electric motor by an electric motor drive command to operate an elevator from among a plurality of brake specifications. An elevator, comprising: brake specification setting means for setting an arbitrary specification; and start-up timer means for giving the electric motor drive command after a brake release time period corresponding to the brake specification set by the brake specification setting means is provided. Control device. 2. The brake release time from when the operation command signal is issued for each setting of the brake specification setting means to when the brake coil is energized to release the braking force. An elevator control device, wherein storage means are provided for storing respective data, and wherein the start-up timer means is configured to give the motor drive command after a braking release time set in the storage means has elapsed.