JP2011020822A - Elevator control device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an elevator control device for reducing power to be consumed when an elevator is stopped. <P>SOLUTION: The elevator control device includes an electromagnetic switch for starting the transfer of a contact from one of an open state and a closed state to the other state when first voltage is applied and for keeping the contact in the other state when second voltage smaller than the first voltage is applied, a power supply for supplying applied voltage to the electromagnetic switch, a detector for detecting the open/closed state of the contact, and a voltage control device for controlling voltage to be supplied from the power supply to the electromagnetic switch in accordance with the open/closed state of the contact detected by the detector. For the electromagnetic switch which is provided for keeping the contact in the other state of the open state and the closed state when the elevator is stopped, the voltage control device controls average applied voltage to be supplied from the power supply to the electromagnetic switch corresponding to the second voltage when the open/closed state of the contact detected by the detector is the other state. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to an elevator control device.

  In current elevators, many are used that repeat operations by exciting and demagnetizing electromagnetic coils, such as electromagnetic switches and electromagnetic brakes. The current electromagnetic brake is controlled so that a large current is supplied when the brake is released, and the current value decreases after the suction is completed. Thereby, the power consumption after suction is reduced (see, for example, Patent Document 1).

Japanese Patent Laid-Open No. 6-200961

  The electromagnetic brake is configured such that suction is released when the elevator is stopped, and it is not necessary to supply current to the electromagnetic brake when the elevator is stopped. For this reason, even if the electromagnetic brake described in Patent Document 1 is used for an elevator that has been stopped for a long time in a small-scale apartment or the like, it has not led to a reduction in power consumption in the entire elevator.

  The present invention has been made to solve the above-described problems, and an object thereof is to provide an elevator control device capable of reducing power consumption when the elevator is stopped.

  The elevator control device according to the present invention is provided in an elevator device, and when a first voltage is applied, the contact starts to shift from one of an open state and a closed state to the other, and is higher than the first voltage. When a small second voltage is applied, an electromagnetic switch that maintains the other state of the contact in the open state and the closed state, a power source that supplies the applied voltage to the electromagnetic switch, and the contact state of the contact A detection device to detect, and is connected between the electromagnetic switch and the power source, and controls a voltage supplied from the power source to the electromagnetic switch based on an opening / closing state of the contact detected by the detection device. A voltage control device, and the voltage control device detects the electromagnetic switch provided so that the contact maintains the other state of the open state and the closed state when the elevator stops. Of the contact When closed state of the other state of the open and closed states, the average applied voltage supplied from the power source to the electromagnetic switch is used to control such that a voltage corresponding to the second voltage.

  According to this invention, it is possible to reduce power consumption when the elevator is stopped.

1 is an electric circuit diagram of an elevator control device in Embodiment 1 of the present invention. FIG. It is an operation | movement waveform diagram of the control apparatus of the elevator in Embodiment 1 of this invention.

  A mode for carrying out the invention will be described with reference to the accompanying drawings. In addition, in each figure, the same code | symbol is attached | subjected to the part which is the same or it corresponds, The duplication description is simplified or abbreviate | omitted suitably.

Embodiment 1 FIG.
In general, the power consumption of an elevator varies greatly depending on the use conditions of the elevator. In the case of an elevator with a long stoppage time in a small apartment, etc., other control devices that consume less power per hour than the power consumed by the hoist with high power consumption per hour are consumed during the long stoppage period. There are many cases where the amount of electric power becomes larger.

  Other control devices include a large number of devices. These devices also include a number of electromagnetic switches. In other words, the power consumption of the electromagnetic switch occupies a small percentage. Some of these electromagnetic switches are constantly excited during the elevator stop period. Usually, the electromagnetic coil of the DC operation electromagnetic switch of the elevator is always driven at the rated voltage. Here, the current flowing through the electromagnetic coil of the electromagnetic switch is proportional to the applied voltage. The power consumption is the product of voltage and current. For this reason, power consumption is generated in proportion to the square of the voltage.

  By the way, before the electromagnetic switch is picked up, the gap of the electromagnetic coil for operating the movable part is open. For this reason, in order to generate a force that overcomes the elastic force of the spring that presses the movable part, it is necessary to apply a relatively large voltage. However, once the spring is compressed, the gap of the electromagnetic coil is reduced. For this reason, the state can be maintained with a relatively small voltage.

  Therefore, in the first embodiment, the applied voltage after pickup of the electromagnetic switch is reduced to reduce power consumption. Hereinafter, the first embodiment will be described in more detail.

1 is an electric circuit diagram of an elevator control apparatus according to Embodiment 1 of the present invention.
In FIG. 1, reference numeral 1 denotes a DC operation type electromagnetic switch. This electromagnetic switch 1 is shown by an electrical equivalent circuit. The electromagnetic switch 1 includes an electromagnetic coil 2, a contact 3, a fixed part of a divided magnetic circuit around which an electromagnetic coil 2 (not shown) is wound, and a division (not shown) that moves together with the contact 3 in accordance with the voltage applied to the electromagnetic coil 2. The movable part of the mold magnetic circuit, and a spring (not shown) that pushes up the gap and contact distance of the magnetic circuit between the movable part and the fixed part of the split magnetic circuit when no voltage is applied to the electromagnetic coil 2. The present control device can be applied to a case where the contact 3 is turned on and off when a voltage is applied to the electromagnetic coil 2, but in this embodiment, the contact 3 is turned on when a voltage is applied to the electromagnetic coil 2. An example of conducting is described. Many of the electromagnetic switches 1 are used in elevator equipment. Specifically, the electromagnetic switch 1 performs the closing / interrupting control of the contact 3 with the electromagnetic coil 2 such as a contactor and a relay.

  The electromagnetic switch 1 has a function of starting a transition from one of the open state and the closed state to the other when the first voltage is applied. Further, the electromagnetic switch 1 has a function of maintaining the other state of the open state and the closed state of the contact 3 when a voltage equal to or higher than the second voltage smaller than the first voltage is applied. 4 is a power supply. The power source 4 has a function of supplying an applied voltage to the electromagnetic switch 1. Reference numeral 5 denotes a detection device. The detection device 5 has a function of detecting the open / closed state of the contact 3 of the electromagnetic switch 1.

  Reference numeral 6 denotes a voltage control device. The voltage control device 6 is connected between the electromagnetic switch 1 and the power source 4. The voltage control device 6 includes a chopper circuit. That is, the voltage control device 6 has a function of varying the average applied voltage supplied from the power source 4 to the electromagnetic switch 1. The voltage control device 6 has a function of controlling the voltage supplied from the power source 4 to the electromagnetic switch 1 based on the open / closed state of the contact 3 of the electromagnetic switch 1 detected by the detection device 5.

  Specifically, the voltage control device 6 determines the average applied voltage supplied from the power source 4 to the electromagnetic switch 1 when the contact 3 detected by the detection device 5 is in the open state or the closed state. Has a function of controlling so that the voltage corresponds to the second voltage.

  7 is a snubber circuit. In the snubber circuit 7, a free wheel diode 8 and a resistor 9 are connected in series. The snubber circuit 7 is connected to the power switch 4 in parallel with the electromagnetic switch 1. The snubber circuit 7 has a function of applying a reverse voltage to the electromagnetic switch 1 when the voltage control device 6 disconnects the connection between the electromagnetic switch 1 and the power source 4.

Next, the configuration of the detection device 5 will be described in more detail.
As shown in FIG. 1, the detection device 5 includes a conduction ratio control signal generation device 10, a calculation device 11, and a drive signal processing circuit 12. The conduction ratio control signal generator 10 has a function of outputting a conduction ratio control signal 13 for setting the output voltage of the voltage controller 6. The arithmetic device 11 has a function of inputting the contact signal 14 of the electromagnetic switch 1. Moreover, the arithmetic unit 11 has a function of outputting a drive signal 15 of the electromagnetic control device. Furthermore, the arithmetic unit 11 has a function of adjusting the active time ratio of the conduction ratio control signal 13 output from the conduction ratio control signal generator 10.

  The drive signal processing circuit 12 includes a NOT circuit 16, first to third AND circuits 17 to 19, and an OR circuit 20. The NOT circuit 16 has a function of inputting the contact signal 14 of the electromagnetic switch 1. The first AND circuit 17 has a function of receiving the contact signal 14 of the electromagnetic switch 1 and the drive signal 15 output from the arithmetic device 11. The second AND circuit 18 has a function of receiving the drive signal 15 output from the arithmetic unit 11 and the output signal of the NOT circuit 16.

  The third AND circuit 19 has a function of receiving the output signal of the first AND circuit 17 and the conduction ratio control signal 13. The OR circuit 20 has a function of receiving output signals of the second and third AND circuits 18 and 19. The OR circuit 20 has a function of outputting a chopper control signal 21 to the voltage control device 6. Further, the drive signal processing circuit 12 outputs the drive signal 15 output from the arithmetic device 11 to the voltage control device 6 as a reflux circuit cutoff signal 22.

Next, the configuration of the voltage control device 6 will be described in more detail.
As shown in FIG. 1, the voltage control device 6 includes a first switching element 23, a reflux rectifying element 24, a second switching element 25, a voltage dividing circuit 26, and a third switching element 27. The first switching element 23 is provided between the electromagnetic coil 2 and the ground. The control terminal of the first switching element 23 is connected to the output terminal of the OR circuit 20. The reflux rectifying element 24 is provided on a wiring connecting the ground side of the electromagnetic coil 2 and the power source 4 side.

  The second switching element 25 is provided between the positive electrode of the power source 4 and the electromagnetic coil 2. The voltage dividing circuit 26 includes first and second resistors 28 and 29. One end of the first resistor 28 is connected to the positive electrode of the power supply 4. The other end of the first resistor 28 is connected to the control terminal of the second switching element 25. One end of the second resistor 29 is connected to the other end of the first resistor 28. The other end of the second resistor 29 is connected to the drain terminal of the third switching element 27. The other end of the switching element is grounded. The control terminal of the third switching element 27 is connected to the drive signal line of the arithmetic device 11.

Next, the basic operation of the voltage control device 6 will be described.
Since the electromagnetic coil 2 has a resistance component and an inductance component of the winding, the current flowing through the winding changes according to the average voltage applied between the terminals of the electromagnetic coil 2. Here, when the first and second switching elements 23 and 25 are conducting, current flows from the power source 4 through a path 30 that passes through the second switching element 25, the electromagnetic coil 2, and the first switching element 23. When the voltage drop at the first and second switching elements 23 and 25 can be ignored, the voltage of the power source 4 is applied to the electromagnetic coil 2. Thereby, the electric current which flows into the electromagnetic coil 2 increases.

  On the other hand, when the first switching element 23 is turned off while the second switching element 25 is turned on, current tends to continue to flow due to the inductance component of the electromagnetic coil 2. However, since the first switching element 23 is in a non-conductive state, no current flows through the path 30.

  That is, a current flows through a path 31 that passes through the return rectifying element 24, the second switching element 25, and the electromagnetic coil 2 by the counter electromotive force of the inductance. At this time, assuming that the voltage drop of the second switching element 25 can be ignored, a reverse voltage corresponding to the forward voltage of the reflux rectifying element 24 is applied between the terminals of the electromagnetic coil 2. By applying the forward voltage of the reflux rectifying element 24, the resistance component of the electromagnetic coil 2 and the voltage drop due to the current flowing through the electromagnetic coil 2 to the inductance component of the electromagnetic coil 2, the current flowing through the electromagnetic coil 2 is reduced. To do.

  Next, when the third switching element 27 is interrupted while a current is flowing through the electromagnetic coil 2, the second switching element 25 is also interrupted. That is, the third switching element 27 drives the second switching element 25 connected to the high side of the power supply 4 from the low side of the power supply 4 via the voltage dividing circuit 26.

  And if the 2nd switching element 25 is interrupted | blocked, the electric current which flows into the electromagnetic coil 2 cannot flow through the path | route 31 which goes through via the 2nd switching element 25. FIG. That is, the second switching element 25 functions as a reflux circuit cutoff circuit. For this reason, the current flowing through the electromagnetic coil 2 flows through the path 32 via the snubber circuit 7. At this time, a large reverse voltage is generated in the snubber circuit 7. This reverse voltage is applied to the electromagnetic coil 2. Thereby, the electric current of the electromagnetic coil 2 decreases rapidly.

Next, a method for setting the second voltage for reducing power consumption will be described.
In order to reduce the power consumption of the electromagnetic switch 1, the second voltage for maintaining the open / close state of the contact 3 between the open state and the closed state is applied from one of the open state and the closed state of the contact 3. It is necessary to make it smaller than the first voltage when starting the transition to the other. Therefore, in the present embodiment, the arithmetic unit 11 monitors the state of the contact signal 14 when the electromagnetic switch 1 is turned on or off and does not affect the device, such as when the elevator is stopped. However, the active time ratio of the conduction ratio control signal 13 is adjusted. Then, the arithmetic device 11 gradually decreases the output voltage of the voltage control device 6 from the rated voltage, determines the voltage at which the contact signal 14 becomes inactive, and stores it as the second voltage.

Next, operation | movement of the control apparatus in operation | movement of an elevator is demonstrated using FIG.
FIG. 2 is an operation waveform diagram of the elevator control apparatus according to Embodiment 1 of the present invention.
In FIG. 2, the horizontal axis represents time, and the vertical axis represents signal intensity. Reference numeral 33 denotes an inter-terminal voltage of the electromagnetic coil 2. Reference numeral 34 denotes a current flowing through the electromagnetic coil 2. Here, the conduction ratio control signal 13 is set corresponding to the second voltage stored in the arithmetic device 11.

  First, in the section a, when the drive signal 15 becomes active, the reflux circuit cutoff signal 22 also becomes active. Further, since the contact signal 14 is inactive, the output of the NOT circuit 16 becomes active. For this reason, both inputs to the second AND circuit 18 are active. As a result, the output of the second AND circuit 18 becomes active. Accordingly, the output of the OR circuit 20 is also activated. That is, the chopper control signal 21 is also activated. For this reason, the inter-terminal voltage 33 controlled by the voltage control device 6 is also approximately equal to the voltage of the power source 4. Thereby, the electric current 34 which flows into the electromagnetic coil 2 increases, and the movable part of the electromagnetic switch 1 picks up at the time of the last stage of the area a.

  That is, in the section b following the section a, the contact 3 is conducted. Thereby, the contact signal 14 becomes active. For this reason, the output of the NOT circuit 16 becomes non-active. As a result, the output of the second AND circuit 18 becomes non-active. On the other hand, the inputs of the first AND circuit 17 are the drive signal 15 and the contact signal 14, both of which are active. For this reason, the output of the first AND circuit 17 is also active. Thereby, one of the inputs of the third AND circuit 19 becomes active.

  The other input of the third AND circuit 19 is a conduction ratio control signal 13. For this reason, the output of the third AND circuit 19 is also equivalent to the conduction ratio control signal 13. Since the output signals of the second and third AND circuits 18 and 19 are input to the OR circuit 20, the output thereof is equivalent to the conduction ratio control signal 13. As a result, the chopper control signal 21 is equivalent to the conduction ratio control signal 13. For this reason, the average value of the inter-terminal voltage 33 of the electromagnetic coil 2 also decreases. Then, following the decrease in the inter-terminal voltage 33, the current 34 flowing through the electromagnetic coil 2 also decreases.

Next, consider the dropout time of the electromagnetic switch 1.
In this case, the arithmetic unit 11 outputs a non-active drive signal 15. As a result, the return circuit cutoff signal 22 also becomes non-active. Accordingly, the third switching element 27 is turned off. Following this, the second switching element 25 is also turned off.

  Thereby, the electromagnetic force energy accumulated in the electromagnetic coil 2 is rapidly consumed by the snubber circuit 7. That is, when the current 34 flowing through the electromagnetic coil 2 is rapidly attenuated and the electromagnetic switch 1 can no longer maintain the pickup state, the movable part of the electromagnetic switch 1 drops out.

  According to the first embodiment described above, the voltage control device 6 detects the electromagnetic switch 1 provided so that the contact 3 maintains the other state of the open state and the closed state when the elevator stops. When the switching state of the contact 3 detected by the device 5 is the other of the open state and the closed state, the average applied voltage supplied from the power source 4 to the electromagnetic switch 1 is a voltage corresponding to the second voltage. Control. For this reason, power consumption when the elevator is stopped can be reduced.

  The voltage control device 6 includes a chopper circuit that varies the average applied voltage supplied from the power source 4 to the electromagnetic switch 1. For this reason, it can respond easily to the specification change etc. of the electromagnetic switch 1 with a comparatively simple circuit structure.

  Further, the snubber circuit 7 applies a reverse voltage to the electromagnetic switch 1 when the voltage control device 6 disconnects the connection between the electromagnetic switch 1 and the power source 4. For this reason, the quick response required for the dropout of the electromagnetic switch 1 can be realized.

  In addition, the voltage control device 6 changes the average applied voltage supplied from the power source 4 to the electromagnetic switch 1 when the elevator is stopped, and the second voltage based on the open / close state of the contact 3 detected by the detection device 5. Is determined and stored. And the voltage control apparatus 6 is the voltage corresponding to the 2nd voltage which the average applied voltage supplied to the electromagnetic switch 1 from the power supply 4 memorize | stored, when the contact 3 maintains the other state of an open state and a closed state Control to become.

  That is, by using the voltage control device 6, it is possible to confirm the second voltage at which the electromagnetic switch 1 is dropped out in an actual machine. For this reason, the optimal drive voltage according to the dispersion | variation of the electromagnetic coil 2 and a use condition can be obtained. Thereby, while being able to ensure the tolerance (system reliability) with respect to a dropout, it can respond easily also to the specification change of the electromagnetic switch 1. FIG.

  Here, in a general electromagnetic switch 1, how much voltage is required to maintain the state after spring compression depends on the product design of the electromagnetic switch 1. For this reason, when the production of the electromagnetic switch 1 is stopped within a long period of use of the elevator, the same electromagnetic switch 1 as that at the time of product shipment may not be supplied as a replacement part. Therefore, when two types of power supplies 4 are prepared and the voltage applied to the electromagnetic coil 2 of the electromagnetic switch 1 is switched, when the voltage specifications of the electromagnetic switch 1 are changed, the power supply 4 is redesigned. Simultaneous replacement is required.

  On the other hand, if the control device of the present embodiment is used, redesign and simultaneous replacement of the power supply 4 become unnecessary. For this reason, the exchange work of the electromagnetic switch 1 can be performed easily.

1 electromagnetic switch, 2 electromagnetic coil, 3 contacts, 4 power supply, 5 detector,
6 Voltage controller, 7 Snubber circuit, 8 Freewheel diode, 9 Resistance,
10 continuity ratio control signal generator, 11 arithmetic unit, 12 drive signal processing circuit,
13 conduction ratio control signal, 14 contact signal, 15 drive signal, 16 NOT circuit,
17 to 19 1st to 3rd AND circuit 20 OR circuit, 21 chopper control signal, 22 return circuit cut-off signal, 23 first switching element, 24 return rectifier element,
25 second switching element, 26 voltage dividing circuit, 27 third switching element,
28, 29 1st and 2nd resistance, 30-32 path | route, 33 Voltage between terminals,
34 Current flowing in electromagnetic coil

Claims (4)

When the first voltage is applied to the elevator device, the contact starts to transition from one of the open state and the closed state to the other, and when a second voltage smaller than the first voltage is applied, An electromagnetic switch in which the contact maintains the other of the open state and the closed state;
A power source for supplying an applied voltage to the electromagnetic switch;
A detection device for detecting the open / closed state of the contact;
A voltage control device that is connected between the electromagnetic switch and the power source and controls a voltage supplied from the power source to the electromagnetic switch based on an open / closed state of the contact detected by the detection device;
With
The voltage control device opens an open / close state of the contact detected by the detection device with respect to an electromagnetic switch provided so that the contact is maintained in an open state or a closed state when the elevator is stopped. An elevator control device that controls so that an average applied voltage supplied from the power source to the electromagnetic switch is a voltage corresponding to the second voltage in the other state of the state and the closed state .   2. The elevator control device according to claim 1, wherein the voltage control device comprises a chopper circuit that varies an average applied voltage supplied from the power source to the electromagnetic switch. A swab circuit that is connected in parallel to the electromagnetic switch with respect to the power source, and applies a reverse voltage to the electromagnetic switch when the electromagnetic control device disconnects the connection between the electromagnetic switch and the power source,
The elevator electromagnetic switch control device according to claim 1, wherein the elevator electromagnetic switch control device is provided. The voltage controller is
When the elevator stops, the average applied voltage supplied from the power source to the electromagnetic switch is changed, and based on the contact open / closed state detected by the detection device, the second voltage is determined and stored,
During the operation of the elevator, when the contact maintains the other state of the open state and the closed state, the average applied voltage supplied from the power source to the electromagnetic switch becomes a voltage corresponding to the stored second voltage. It controls so that it may become. The control apparatus of the elevator in any one of Claims 1-3 characterized by the above-mentioned.

Images