JP2010202364A - Elevator control device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To perform speed control highly accurately by eliminating a detection error by a current detector of an elevator caused by fluctuation due to a temperature and always performing accurate current detection. <P>SOLUTION: When driving of the elevator is stopped, the control device 20 performs demagnetization control of the current detectors 5A, 5B. An offset voltage detection/correction circuit 24 detects an offset voltage of an electronic circuit inside of the current detectors 5A, 5B. A temperature detection circuit 25 detects a peripheral temperature of the current detectors 5A, 5B based on the output result from the temperature sensor 15. The offset voltage detection/correction circuit 24 estimates a variation amount of the offset voltage based on the temperature and corrects a deviation of the offset voltage by reflecting the variation amount to the already detected offset voltage. When driving is started, the control device 20 calculates an output voltage proportional to the current to be measured by reducing the corrected offset voltage from an output voltage value from the current detectors 5A, 5B. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention particularly relates to an elevator control device that drives an inverter device by a current feedback control system.

  Usually, in an elevator, the current of each phase supplied from the inverter device to the electric motor is detected by a current detector, and this is fed back to the control device for speed control. This is called a current feedback control method, and a magnetic current sensor composed of a core, a Hall element, and a voltage output electronic circuit is generally used as a current detector.

  In this magnetic current sensor, a magnetic field generated in a core by a current to be measured is converted into a voltage signal by a Hall element. At that time, a minute magnetic flux remains in the core, which affects subsequent current detection.

  The electronic circuit of the current detector outputs a minute signal, that is, an offset even when the detected current is 0, such as when the elevator is stopped. For this reason, a command in which the offset is always added or subtracted is given to the control signal of the inverter. As a result, torque ripple due to the direct current is generated, and the car vibrates and the riding comfort deteriorates. Problems arise.

  In order to solve such a problem, conventionally, before starting the operation of the elevator, for example, as disclosed in Patent Document 1, an alternating current that decays with time is supplied to the current detector, and the current detector The demagnetization operation is performed to remove the hysteresis of the magnetic circuit of FIG. 5, the voltage measurement value in the state of current 0 after this demagnetization operation is set as the offset voltage, and the value obtained by subtracting the offset voltage from the voltage measurement value obtained by the current detector thereafter The output voltage is proportional to the measured current.

JP 2008-44681 A

  However, the offset voltage described above is not always constant and varies with temperature. That is, even if the offset voltage is measured when the elevator is stopped, if the temperature subsequently varies, a deviation due to a temperature change occurs in the measured offset voltage. Therefore, even if the offset value is simply subtracted from the voltage measurement value from the current detector during elevator operation, the output voltage proportional to the current to be measured cannot be accurately derived, and speed control is affected. It cannot be resolved.

  SUMMARY OF THE INVENTION An object of the present invention is to provide an elevator control device that eliminates a detection error caused by a current detector due to fluctuations due to temperature, and that can always perform accurate current detection and perform highly accurate speed control. It is in.

  An elevator control apparatus according to the present invention includes a rectifier circuit that converts AC power from an AC power source into DC power, a smoothing capacitor that smoothes pulsation of DC power converted by the rectifier circuit, and the smoothed DC power. Is converted into AC power of variable voltage and variable frequency and output, an electric motor driven by the AC power output from the inverter to raise and lower the car, and a magnetic type that detects the current output from the inverter device Current detector, a demagnetizing circuit for energizing a current for demagnetizing the residual magnetic flux of the current detector when the motor is stopped, and an offset voltage of an electronic circuit inside the current detector after energization by the demagnetizing circuit An offset voltage detection circuit for detecting the temperature, a temperature detector for detecting a temperature around the current detector, and a temperature detected by the temperature detector. Correction for correcting a deviation due to temperature of the offset voltage of the electronic circuit inside the current detector detected by the offset voltage detection circuit by predicting a change amount due to temperature of the offset voltage of the electronic circuit inside the current detector. Means.

  According to the present invention, it is possible to eliminate a detection error caused by an elevator current detector due to a variation due to temperature, and always perform accurate current detection to perform highly accurate speed control.

The figure which shows the structure of the control apparatus of the elevator in the 1st Embodiment of this invention. The schematic diagram for demonstrating the structure of the magnetic proportional type current sensor used as a current detector of the elevator control apparatus in the 1st Embodiment of this invention. The figure for demonstrating the sweep electric current used as an electric current for demagnetization to the electric current detector of the elevator control apparatus in the 1st Embodiment of this invention. The flowchart which shows the processing operation of the control apparatus of the elevator in the 1st Embodiment of this invention. The figure which shows the structure of the control apparatus of the elevator in the 2nd Embodiment of this invention. The flowchart which shows the processing operation of the control apparatus of the elevator in the 2nd Embodiment of this invention. The figure which shows the structure of the control apparatus of the elevator in the 3rd Embodiment of this invention. The schematic diagram for demonstrating the structure of the magnetic balance type current sensor used as a current detector of the elevator control apparatus in the 3rd Embodiment of this invention. The flowchart which shows the processing operation of the control apparatus of the elevator in the 3rd Embodiment of this invention. The figure which shows the structure of the control apparatus of the elevator in the 4th Embodiment of this invention. The flowchart which shows the processing operation of the control apparatus of the elevator in the 4th Embodiment of this invention. The figure which shows the structure of the control apparatus of the elevator in the 5th Embodiment of this invention. The flowchart which shows the processing operation of the control apparatus of the elevator in the 5th Embodiment of this invention. The figure which shows the structure of the control apparatus of the elevator in the 6th Embodiment of this invention. The flowchart which shows the processing operation of the control apparatus of the elevator in the 6th Embodiment of this invention. The figure which shows the structure of the control apparatus of the elevator in the 7th Embodiment of this invention. The flowchart which shows the processing operation of the control apparatus of the elevator in the 7th Embodiment of this invention.

Embodiments of the present invention will be described below with reference to the drawings.
(First embodiment)
First, a first embodiment of the present invention will be described.
FIG. 1 is a diagram showing a configuration of an elevator control device according to a first embodiment of the present invention. As an elevator drive system, a three-phase AC power source 1, a converter device 2, a smoothing capacitor 3, an inverter device 4, current detectors (CS) 5A and 5B, an electric motor (M) 6, a regenerative resistor 7 and a switching element 8 are provided. Prepare.

  The three-phase AC power source 1 supplies AC power of a predetermined power as a commercial power source. Converter device 2 converts AC power supplied from three-phase AC power supply 1 into DC power. Smoothing capacitor 3 smoothes the pulsation of DC power that is the output power of converter device 2. The inverter device 4 converts the DC power supplied from the converter device 2 through the smoothing capacitor 3 into AC power having a variable frequency and variable voltage value by PWM (Pulse Width Modulation) control, and supplies this to the motor 6 as drive power. To do.

  A sheave 11 of a hoisting machine is attached to a rotating shaft of the electric motor 6, and a car 13 and a counterweight 14 are lifted and lowered in a hoistway manner through a rope 12 wound around the hoisting machine. The electric motor 6 is driven by AC power output from the inverter device 4 to raise and lower the car 13.

  The regenerative resistor 7 is a resistor for converting regenerative power into heat energy. The switching element 8 is turned on during the regenerative operation and causes the regenerative power flowing back from the inverter device 4 to flow through the regenerative resistor 7.

  That is, for example, when the car 13 moves downward in the hoistway, if the load of the car 13 at that time is heavier than the counterweight 14, no power is required, so the motor 6 functions as a generator. Thus, regenerative power is generated. Further, when the car 13 moves upward, if the load on the car 13 at that time is lighter than the counterweight 14, no power is required, so regenerative power is generated. In this way, driving a car without requiring power is called “regenerative operation”, and conversely, driving that requires power is called “power running operation”. The electric power generated during the regenerative operation is converted into heat energy by the regenerative resistor 7 via the switching element 8 and consumed.

  The current detectors 5 </ b> A and 5 </ b> B are provided between the inverter device 4 and the electric motor 6, and detect the current of each phase supplied from the inverter device 4. The configuration of the current detectors 5A and 5B will be described later with reference to FIG.

  The currents detected by the current detectors 5A and 5B are converted into voltage signals and supplied to the control device 20. The control device 20 detects this voltage signal as a current value currently supplied to the electric motor 6.

  The control device 20 is configured by a computer on which a CPU, a ROM, a RAM, and the like are mounted. The control device 20 drives and controls the inverter device 4 based on the current values detected by the current detectors 5A and 5B. In addition, the control device 20 performs switching control of the switching element 8 according to the current operation state (regeneration / power running).

  The control device 20 is provided with a microcomputer 21, a microcomputer control circuit 22, a demagnetization circuit 23, an offset voltage detection / correction circuit 24, a temperature detection circuit 25, and a gate drive circuit 26 that control the entire processing operation. A temperature sensor 15 is installed in the vicinity of the current detector 5B. The installation location of the temperature sensor 15 may be in the vicinity of the current detector 5B. In this embodiment, it is assumed that the temperature in the vicinity of the current detector 5A and the temperature in the vicinity of the current detector 5B are the same.

The degaussing circuit 23 supplies a current for demagnetization to the current detectors 5A and 5B via the gate drive circuit 26 and the inverter device 4 at a predetermined timing to demagnetize the residual magnetic flux of the current detectors 5A and 5B. Perform degaussing control.
The temperature detection circuit 25 detects the temperature around the electronic circuit inside the current detector based on the output result from the temperature sensor 15.

The offset voltage detection / correction circuit 24 detects the offset voltage of the electronic circuit inside the current detectors 5A and 5B based on the output results from the current detectors 5A and 5B at a predetermined timing. Further, the offset voltage detection / correction circuit 24 calculates the offset voltage deviation of the electronic circuits inside the current detectors 5A and 5B due to temperature fluctuations based on the detection result by the temperature detection circuit 25, and this calculation. The correction means corrects the detected offset voltage to an accurate offset voltage in consideration of temperature fluctuation by reflecting the result on the detected offset voltage.
The gate drive circuit 26 gives each control signal output from the control device 20 to the inverter device 4 and the switching element 8.

FIG. 2 is a schematic diagram for explaining a configuration of a magnetic proportional current sensor used as a current detector of the elevator control apparatus according to the first embodiment of the present invention. FIG. 3 is a diagram for explaining a sweep current used as a current for demagnetization to the current detector of the elevator control device according to the first embodiment of the present invention.
Normally, a magnetic proportional current sensor 30 as shown in FIG. 2 is used as the current detectors 5A and 5B. The magnetic proportional current sensor 30 includes a magnetic core 31 having a gap, a Hall element 32 that is an electromagnetic conversion element, and an amplification circuit 33 that amplifies the output from the Hall element 32. When a current to be measured flows through the conductive wire 34, a magnetic field proportional to the current to be measured is generated in the magnetic core 31. The hall element 32 converts the magnetic field generated in the magnetic core 31 into a voltage signal. This voltage signal is amplified by the amplifier circuit 33 and output.

  By the way, in the current detectors 5A and 5B having such a configuration, there is a problem that the magnetic flux remains in the magnetic core 31 and this affects the next current detection. Therefore, in the present embodiment, each time the car 13 stops at the destination floor, a current (5A, 5B) is swept through the current detectors 5A and 5B for a short time as shown in FIG. , 5B is demagnetized to return to a reset state, that is, a non-current detection state.

  The initial value Ix of the sweep current is set to the rated current of the current detectors 5A and 5B, and attenuation control is performed from the initial value Ix to zero within a predetermined time tx at a predetermined frequency Tx. By applying such a sweep current at a high frequency, the residual magnetic flux can be effectively demagnetized in a short time. On the other hand, even with a sweep current, at a low frequency, not only does it take time, but it also becomes difficult to demagnetize the residual magnetic flux cleanly.

The processing operation of the first embodiment will be described below.
FIG. 4 is a flowchart showing the processing operation of the elevator control apparatus according to the first embodiment of the present invention.
First, an operation command is input to the control device 20 with the occurrence of a car call or a hall call. Thereby, the control apparatus 20 drives and controls the inverter apparatus 4, and starts the driving | operation of an elevator (car 13) (step S1). When the elevator reaches the destination floor (step S2), the control device 20 terminates the operation of the elevator, that is, performs stop control (step S3).

  It is assumed that information during the elevator operation, for example, car position, door opening / closing, and the like are sequentially input to the control device 20. Further, the current supplied from the inverter device 4 to the electric motor 6 is detected by the current detectors 5A and 5B and fed back to the control device 20, and the control device 20 drives the inverter device 4 based on the detected value. The elevator is driven at the target speed by controlling.

Here, at the timing when the operation of the elevator is stopped, the control device 20 performs degaussing control of the current detectors 5A and 5B by the degaussing circuit 23 (step S4). After the demagnetization control, the control device 20 opens and closes the door of the elevator and enters the next operation preparation (step S5).
The stop of the elevator operation described above refers to a case where the elevator (car 13) has landed on the destination floor and the rotation of the electric motor 6 has stopped.

  The demagnetization control described above is performed by supplying a current for demagnetization from the inverter device 4 to the current detectors 5A and 5B for a short time. Specifically, as described with reference to FIG. 3, energization is performed so that an initial value Ix of a preset current is gradually attenuated to zero at a predetermined frequency Tx within a predetermined time tx.

  Next, the offset voltage detection / correction circuit 24 detects the offset voltage by the electronic circuit inside the current detectors 5A and 5B by detecting the output voltage from the current detectors 5A and 5B (step S6).

Then, the temperature detection circuit 25 detects the ambient temperature of the current detectors 5A and 5B based on the output result from the temperature sensor 15 (step S7).
Based on the temperature detected by the temperature detection circuit 25, the offset voltage detection / correction circuit 24 predicts the amount of change due to the temperature of the offset voltage of the electronic circuit inside the current detectors 5A and 5B detected as described above. (Step S8).

  Further, the offset voltage detection / correction circuit 24 reflects the amount of deviation due to the temperature of the offset voltage of the electronic circuit inside the current detectors 5A and 5B by reflecting the change amount predicted as described above in the already detected offset voltage. Correction is performed (step S9).

  Thereafter, when the operation is started (step S10), the control device 20 detects the output voltage from the current detectors 5A and 5B (step S11), and corrects the detected value by the process of step S9. The output voltage proportional to the current to be measured is calculated by subtracting the already offset voltage (step S12).

  As described above, in the elevator control apparatus according to the first embodiment of the present invention, based on the temperature of the electronic circuit inside the current detector, the deviation due to the temperature of the offset voltage of the electronic circuit is predicted, Since the offset voltage is corrected to a value that takes into account the deviation due to temperature based on this prediction result, the deviation of offset voltage due to temperature can be canceled out. Therefore, highly accurate speed control can be performed.

(Second Embodiment)
Next, a second embodiment of the present invention will be described. In addition, description of the same part as what was shown in FIG. 1 among the structures of the elevator control apparatus in each following embodiment is abbreviate | omitted.
FIG. 5 is a diagram illustrating a configuration of an elevator control device according to the second embodiment of the present invention.
An electronic circuit outside the current detectors 5A and 5B is connected in the vicinity of the electronic circuits inside the current detectors 5A and 5B described in the first embodiment, and the offset voltage is the current detectors 5A and 5B. Generated for an electronic circuit that combines an internal electronic circuit and an external electronic circuit.

  Therefore, in this second embodiment, in order to obtain an accurate output voltage proportional to the current to be measured, the electronic circuit inside the current detectors 5A and 5B and the external electronic circuit are obtained from the voltage measurement value by the current detector. The offset voltage of the electronic circuit combined with is detected, and the amount of change due to temperature fluctuations is predicted for this voltage.

  As shown in FIG. 5, in the elevator control apparatus according to the second embodiment of the present invention, an offset voltage detection / correction circuit 27 is used instead of the offset voltage detection / correction circuit 24 as compared with the first embodiment. Prepare.

  In this embodiment, it is assumed that the temperature near the electronic circuit inside the current detectors 5A and 5B and the temperature near the electronic circuit outside the current detectors 5A and 5B are the same. That is, the temperature detection circuit 25 detects the temperature of the electronic circuit that combines the internal electronic circuit of the current detectors 5A and 5B and the external electronic circuit based on the output result from the temperature sensor 15.

  In the present embodiment, the offset voltage detection / correction circuit 27 calculates the amount of change in the offset voltage of the electronic circuit that combines the internal electronic circuit of the current detectors 5A and 5B and the external electronic circuit due to temperature fluctuations. By reflecting the result on the offset voltage of the electronic circuit including the internal and external electronic circuits of the current detectors 5A and 5B that have already been detected, the internal electronic circuit and the external electronic circuit of the current detectors 5A and 5B To obtain an accurate offset voltage of the electronic circuit.

The processing operation of the second embodiment will be described below.
FIG. 6 is a flowchart showing the processing operation of the elevator control apparatus according to the second embodiment of the present invention.
First, the processing operations from Steps S1 to S5 described in the first embodiment are performed. At this point, demagnetization control and door opening / closing are performed. Next, the offset voltage detection / correction circuit 27 detects the output voltage from the current detectors 5A and 5B, thereby offsetting the electronic circuit including the electronic circuits inside the current detectors 5A and 5B and the external electronic circuit. A voltage is detected (step S21).

  The temperature detection circuit 25 detects the temperature around the electronic circuit including the electronic circuit inside the current detectors 5A and 5B and the external electronic circuit based on the output result from the temperature sensor 15 on the current detector 5B side. (Step S22).

  The offset voltage detection / correction circuit 27 is based on the temperature detected by the temperature detection circuit 25, and the amount of change in the offset voltage of the electronic circuit that combines the electronic circuits inside the current detectors 5A and 5B and the external electronic circuit depending on the temperature. Is predicted (step S23).

  The offset voltage detection / correction circuit 27 then detects the predicted value of the amount of change in the offset voltage of the electronic circuit that combines the electronic circuits inside the current detectors 5A and 5B and the external electronic circuit, By reflecting the offset voltage of the electronic circuit combining the electronic circuit inside 5B and the external electronic circuit, depending on the temperature of the offset voltage of the electronic circuit combining the electronic circuit inside the current detectors 5A and 5B and the external electronic circuit. The deviation is corrected (step 24).

  Thereafter, when the operation is started (YES in step S25), the control device 20 detects the output voltage from the current detectors 5A and 5B (step S26), and the processing in step S24 is performed on this detected value. The output voltage proportional to the current to be measured is calculated by subtracting the corrected offset voltage at (Step S27).

  As described above, in the elevator control apparatus according to the second embodiment of the present invention, in addition to the features described in the first embodiment, the offset of the electronic circuit that combines the electronic circuit inside the current detector and the external electronic circuit. Since the offset due to the temperature of the voltage is predicted and the offset voltage is corrected to a value that takes into account the shift due to the temperature based on this prediction result, the electronic circuit inside the current detector due to temperature and the external electronic circuit The offset voltage deviation of the combined electronic circuit can be canceled out. Therefore, more accurate speed control can be performed.

(Third embodiment)
Next, a third embodiment of the present invention will be described.
FIG. 7 is a diagram illustrating a configuration of an elevator control device according to the third embodiment of the present invention.
In the third embodiment, the demagnetization control is performed after the power source of the current detector is turned off. 1 differs from the configuration of FIG. 1 in that a CS power source 41 for supplying a drive current to the current detectors 5A and 5B, and an open / close switch 42A provided between the CS power source 41 and the current detectors 5A and 5B, 42B and a switch drive circuit 43 that opens and closes the open / close switches 42A and 42B.

In this embodiment, a magnetic balance type current sensor 50 is used as the current detectors 5A and 5B. FIG. 8 is a schematic diagram for explaining a configuration of a magnetic balance type current sensor used as a current detector of an elevator control apparatus according to a third embodiment of the present invention.
When demagnetizing the remaining magnetic flux of the current detectors 5A and 5B, if the CS power supply 41 is in an ON state, the remaining magnetic flux can be reliably ensured even if a degaussing current is passed through the current detectors 5A and 5B. May not be zero. In particular, when a magnetic balance type current sensor 50 as shown in FIG. 8 is used as the current detectors 5A and 5B, the possibility increases.

  In other words, the magnetic balance type current sensor 50 is a closed loop type sensor in which a feedback current flows through the secondary winding so that the magnetic field generated by the detected current is always zero. As shown in FIG. 8, the magnetic balance type current sensor 50 includes a magnetic core 51 having a gap, a secondary winding (coil) 52 wound around the magnetic core 51, and a hole as an electromagnetic conversion element. An element 53 and an amplifier circuit 54 that amplifies the output from the Hall element 53 are configured.

  The secondary winding 52 is wound in a direction that cancels out the magnetic field generated by the current to be measured. When a current to be measured flows through the lead wire 55 passing through the magnetic core 51, a magnetic field proportional to the current to be measured is generated in the magnetic core 51. The hall element 53 converts the magnetic field generated in the magnetic core 51 into a voltage signal. This voltage signal is converted into a current by the amplifier circuit 54 and fed back to the secondary winding 52. As a result, the cancel magnetic field generated in the secondary winding 52 and the magnetic field generated by the current to be measured cancel each other, and the magnetic field in the gap operates to be always zero. Further, the cancel current flowing through the secondary winding 52 is converted into a voltage signal via the output resistor 56 and is taken out as a sensor output.

  In such a configuration, when the CS power supply 41 is ON, a magnetic flux is likely to be accumulated in the secondary winding 52, which affects the next current detection. Therefore, in the third embodiment, the demagnetization control is performed after the CS power supply 41 is once turned off to reliably demagnetize the residual magnetic flux.

The processing operation of the third embodiment will be described below.
FIG. 9 is a flowchart showing the processing operation of the elevator control apparatus according to the third embodiment.
First, the processing operations from step S1 to S3 described in the first embodiment are performed. At this point, the elevator has landed on the destination floor, and the inverter device 4 has stopped controlling. Next, the control device 20 opens the open / close switches 42A and 42B through the switch drive circuit 43 (step S31), and turns off the CS power supply 41 (step S32). In this state, the control device 20 performs degaussing control of the current detectors 5A and 5B by the degaussing circuit 23 (step S33). After the demagnetization control, the control device 20 opens and closes the elevator door (step S34), closes the open / close switches 42A and 42B, and returns the CS power supply 41 to the ON state (step S35). S36).
Thereafter, the processing after step S6 described in the first embodiment, that is, the operation after the detection of the offset voltage by the offset voltage detection / correction circuit 24 is performed.

  As described above, in the elevator control apparatus according to the third embodiment of the present invention, in addition to the features described in the first embodiment, the deenergization control is performed after the CS power supply 41 is once turned off. , 5B can be degaussed more reliably and the accuracy of current detection can be improved. Therefore, more accurate speed control can be performed.

(Fourth embodiment)
Next, a fourth embodiment of the present invention will be described.
FIG. 10 is a diagram illustrating a configuration of an elevator control device according to the fourth embodiment of the present invention.
As shown in FIG. 10, in the fourth embodiment of the present invention, the control device 20 further includes a linearity detection circuit 61 in place of the offset voltage detection / correction circuit 24 as compared with the first embodiment. Includes a voltage correction circuit 28.

  The linearity detection circuit 61 continuously measures the output voltages of the current detectors 5A and 5B after the elevator operation is started, and the measured voltage and a normal output voltage corresponding to a predetermined operation pattern of the started operation. Measure the deviation.

The processing operation of the fourth embodiment will be described below.
FIG. 11 is a flowchart showing the processing operation of the elevator control apparatus according to the fourth embodiment of the present invention.
First, in the initial state, the operation of the elevator is stopped, and at this timing, the control device 20 performs demagnetization control of the current detectors 5A and 5B (step S40). After the demagnetization control, the control device 20 opens and closes the elevator door and starts operation preparation (step S41).

  When the operation of the elevator is started (step S42), the linearity detection circuit 61 of the control device 20 continuously measures the output voltages of the current detectors 5A and 5B, By calculating the difference from the normal output voltage corresponding to the preset operation pattern of the started operation, here the voltage not considering the voltage fluctuation due to the temperature fluctuation, the output by the electronic circuit inside the current detectors 5A and 5B The voltage deviation is calculated (step S43).

Then, the temperature detection circuit 25 detects the ambient temperature of the current detectors 5A and 5B based on the output result from the temperature sensor 15 (step S44).
Based on the temperature detected by the temperature detection circuit 25, the voltage correction circuit 28 predicts the amount of change in the offset voltage by the electronic circuit inside the current detectors 5A and 5B (step S45).

  The control device 20 compares the deviation calculated in the process of step S43 with the amount of change predicted in the process of step S45, and if both are equal or the difference between the two is within a predetermined range, the current detector 5A. , 5B are operating normally, that is, the output voltage shift is not caused by factors other than temperature fluctuations (YES in step S46), and the voltage correction circuit 28 determines the amount of change predicted in the process of step S45. Is reflected in the output voltage detected by the linearity detection circuit 61, thereby correcting the deviation of the output voltage by the electronic circuit inside the current detectors 5A and 5B (step S47).

  Further, the control device 20 determines “NO” in the process of step S46, that is, if the difference between the deviation calculated in the process of step S43 and the change amount predicted in the process of step S45 is not within a predetermined range. It is considered that a failure has occurred in the current detectors 5A and 5B, and the operation of the elevator is stopped (step S48).

  As described above, in the elevator control device according to the fourth embodiment of the present invention, it is possible to correct the deviation of the output voltage in the current detectors 5A and 5B even during the elevator operation, and the current detectors 5A and 5B can be corrected. The shift amount of the output voltage inside 5B is small, and the elevator driving motor can be driven with high accuracy.

(Fifth embodiment)
Next, a fifth embodiment of the present invention will be described.
FIG. 12 is a diagram illustrating a configuration of an elevator control device according to the fifth embodiment of the present invention.
As shown in FIG. 12, the fifth embodiment of the present invention further includes a vibration detector 71 that detects the vibration value of the car 13 as compared with the first embodiment.

The processing operation of the fifth embodiment will be described below.
FIG. 13 is a flowchart showing the processing operation of the elevator control apparatus according to the fifth embodiment of the present invention.
First, an operation command is input to the control device 20 with the occurrence of a car call or a hall call. Thereby, the control apparatus 20 controls the drive of the inverter apparatus 4, and starts the driving | operation of an elevator (car 13) (step S51).

  After this operation is started, that is, while the elevator is activated, the vibration detector 71 measures the vibration value of the elevator car 13 and outputs the measurement result to the control device 20 (step S52).

When the frequency from the vibration detector 71 is equal to or higher than the predetermined reference value (YES in step S53), the control device 20 stops the operation of the elevator when the elevator reaches the destination floor (step S54). Control is performed (step S55).
The control device 20 performs demagnetization control of the current detectors 5A and 5B at the timing when the operation is stopped (step S56).
After the demagnetization control, the processing in step S5 described in the first embodiment, that is, the operation after opening and closing the door is performed.

  On the other hand, when the frequency from the vibration detector 71 is not equal to or higher than the predetermined reference value (NO in step S53), the control device 20 operates the elevator when the elevator reaches the destination floor (step S57). Stop control is performed (step S58). Then, the control device 20 opens and closes the door of the elevator to enter the next operation preparation (step S59), and returns to the processing operation of step S51.

  As described above, in the elevator control apparatus according to the fifth embodiment of the present invention, in addition to the features described in the first embodiment, demagnetization control is performed when the frequency of the car 13 is equal to or higher than a reference value. It is possible to save the trouble of performing demagnetization control each time the elevator is stopped, efficiently demagnetize the current detectors 5A and 5B as necessary, and maintain the current detection accuracy.

(Sixth embodiment)
Next, a sixth embodiment of the present invention will be described.
FIG. 14 is a diagram illustrating a configuration of an elevator control device according to the sixth embodiment of the present invention.
As shown in FIG. 14, in the sixth embodiment of the present invention, as compared with the first embodiment, the control device 20 detects the torque component current that detects the ripple component of the torque component current flowing into the electric motor 6 of the elevator. A detection circuit 81 is further provided.

The processing operation of the sixth embodiment will be described below.
FIG. 15 is a flowchart showing the processing operation of the elevator control apparatus according to the sixth embodiment of the present invention.
First, an operation command is input to the control device 20 with the occurrence of a car call or a hall call. Thereby, the control apparatus 20 controls the drive of the inverter apparatus 4, and starts the driving | operation of an elevator (car 13) (step S61).

  After this operation is started, that is, while the elevator is activated, the torque component current detection circuit 81 of the control device 20 detects the ripple rate of the ripple component of the torque component current flowing into the electric motor 6 of the elevator, and the detection result is controlled by the control device. 20 (step S62).

When the ripple rate from torque component current detection circuit 81 is equal to or greater than a predetermined reference value (YES in step S63), control device 20 operates the elevator when the elevator reaches the destination floor (step S64). Is stopped (step S65).
At the timing when the operation is stopped, the control device 20 performs demagnetization control of the current detectors 5A and 5B (step S66).
After the demagnetization control, the processing in step S6 described in the first embodiment, that is, the operation after opening and closing the door is performed.

  On the other hand, when the ripple rate from the torque component current detection circuit 81 is not equal to or greater than the predetermined reference value (NO in step S63), the control device 20 causes the elevator to land on the destination floor (step S67). The operation is stopped and controlled (step S68). Then, the control device 20 opens and closes the door of the elevator to enter the next operation preparation (step S69), and returns to the processing operation of step S61.

  As described above, in the elevator control device according to the sixth embodiment of the present invention, in addition to the features described in the first embodiment, the ripple rate of the ripple component of the torque component current flowing into the elevator motor 6 is greater than or equal to the reference value. In this case, demagnetization control is performed, so that it is possible to save the trouble of performing demagnetization control each time the elevator is stopped, and to efficiently demagnetize the current detectors 5A and 5B as necessary to maintain the current detection accuracy. it can.

(Seventh embodiment)
Next, a seventh embodiment of the present invention will be described.
In the seventh embodiment, when the offset voltage of the electronic circuit inside the current detector before operation is abnormal, or when the output voltage during operation is abnormal, abnormality is detected in the output of the current detector after degaussing control. Or when an abnormality is detected in the offset voltage after correction according to the offset voltage change prediction based on temperature detection after degaussing control, .

FIG. 16 is a diagram illustrating a configuration of an elevator control device according to the seventh embodiment of the present invention.
As shown in FIG. 16, in the seventh embodiment of the present invention, as compared with the first embodiment, the control device 20 includes a protection operation unit 91 that is a protection unit and a notification unit 92 that is a notification unit. And further comprising. The protection operation unit 91 detects an abnormality in the output of the current detector after degaussing control when the offset voltage by the electronic circuit inside the current detector before operation is abnormal, or when the output voltage during operation is abnormal. Or when an abnormality is detected in the offset voltage after correction associated with the prediction of the amount of change in offset voltage due to temperature detection after degaussing control, the service operation of the elevator is suspended according to an instruction from the control device 20. A predetermined protection operation is performed to ensure

  The reporting unit 92 reports the occurrence of an abnormality to a predetermined location in conjunction with the protection operation unit 91. The predetermined place may be a place where the apparatus is installed, that is, a machine room, a building management room, or an external remote monitoring center via a communication network. In short, any location that can be confirmed immediately by an administrator or maintenance personnel is acceptable. Further, as a method of issuing a warning, a warning message may be displayed through a display, in addition to outputting a warning sound through a speaker or outputting a warning message as a voice. In this embodiment, the control device 20 functions as an output voltage detection unit that constantly detects an output voltage from an electronic circuit inside the current detectors 5A and 5B.

The processing operation of the seventh embodiment will be described below.
FIG. 17 is a flowchart showing the processing operation of the elevator control apparatus according to the seventh embodiment of the present invention.
With the occurrence of a car call or a hall call, an operation command is input to the control device 20. At that time, the offset voltage detection / correction circuit 24 of the control device 20 detects the output voltage of the electronic circuit inside the current detectors 5A and 5B, that is, the offset voltage value (step S71), and this offset voltage value is previously normal. It is determined whether it is within the voltage range set as a value (step S72).

  Since this state is a state before operation, normally, the temperature of the electronic circuit inside the current detectors 5A and 5B has no temperature fluctuation that fluctuates the offset voltage, and the influence of the residual magnetic flux on the output voltage. It is thought that there is not. However, when the offset voltage of the electronic circuit inside the current detectors 5A and 5B is outside the set range (NO in step S72), the control device 20 determines that the current detectors 5A and 5B are out of order. Immediately, the protection operation unit 91 is activated to stop the service operation of the elevator (step S73), and the reporting unit 92 is activated to report the occurrence of an abnormality (step S74).

  Also, if the offset voltage of the electronic circuit inside the current detectors 5A and 5B is within the set range (YES in step S72), the control device 20 controls the drive of the inverter device 4 as usual and controls the elevator (car 13). ) Is started (step S75).

  After the start of operation, before the elapse of a certain time, the control device 20 detects the output voltage of the current detectors 5A and 5B, and confirms whether or not the detected output voltage is within a voltage range set in advance as a normal value. (Step S76). The voltage range used in this process is a voltage range narrower than the voltage range used in the process of step S72. Here, it is assumed that the time after the start of operation is short, and there is no temperature fluctuation that fluctuates the offset voltage included in the output voltage of the electronic circuit inside the current detectors 5A and 5B. Suppose there is no effect.

  When the output voltages of the current detectors 5A and 5B are outside the set range (NO in step S76), the control device 20 determines that the current detectors 5A and 5B are out of order and stops the control of the inverter device 4. After that (step S77), the protection operation unit 91 is immediately activated to stop the service operation of the elevator (step S73), and the alarm unit 92 is activated to report the occurrence of an abnormality (step S74). . The voltage range used in the process of step S76 described above is a voltage range narrower than the voltage range used in the process of step S72. The car 13 after the start of operation caused by the offset voltage shift causes the car 13 to This is for promptly stopping.

  If the output voltages of the current detectors 5A and 5B are within the set range (YES in step S76), when the elevator reaches the destination floor (step S78), the control device 20 performs stop control of the operation of the elevator. This is performed (step S79).

Here, the control device 20 performs demagnetization control of the current detectors 5A and 5B (step S80).
After the demagnetization control, the offset voltage detection / correction circuit 24 detects the offset voltage of the electronic circuit inside the current detectors 5A and 5B (step S81), and the detected offset voltage is a voltage set in advance as a normal value. It is confirmed whether it is out of range (step S82).

  The residual magnetic flux of the current detectors 5A and 5B has been demagnetized by the demagnetization control described above, and since it is in a state before operation, the output voltage values of the current detectors 5A and 5B are normally within the voltage range described above. Become.

  If the offset voltage is within the set range (YES in step S82), the control device 20 opens and closes the elevator door as it is to prepare for the next operation (step S88). Thereafter, when the operation is started, the control device 20 detects the output voltage from the current detectors 5A and 5B, and reduces the offset voltage corrected in the process of step S9 with respect to the detected value. Thus, the output voltage proportional to the current to be measured is calculated.

  However, if the offset voltage is outside the set range (NO in step S82), the control device 20 determines that the offset voltage of the electronic circuit inside the current detectors 5A and 5B has fluctuated due to the temperature, and the temperature The detection circuit 25 detects the ambient temperature of the current detectors 5A and 5B based on the output result from the temperature sensor 15 (step S83).

  Based on the temperature detected by the temperature detection circuit 25, the offset voltage detection / correction circuit 24 predicts the amount of change due to the temperature of the offset voltage of the electronic circuit inside the current detectors 5A and 5B detected as described above. (Step S84).

  Then, the offset voltage detection / correction circuit 24 reflects the amount of change predicted as described above in the offset voltage already detected in the process of step S81, thereby reducing the offset voltage of the electronic circuit in the current detectors 5A and 5B. The deviation due to temperature is corrected (step S85).

  Then, the offset voltage detection / correction circuit 24 detects again the offset voltage of the electronic circuit inside the current detectors 5A and 5B (step S86), and the detected offset voltage falls within a voltage range set in advance as a normal value. It is confirmed whether it is contained (step S87).

  If the offset voltage is within the set range (YES in step S87), the control device 20 opens and closes the door of the elevator as it is to prepare for the next operation (step S88). However, if the offset voltage is outside the set range (NO in step S87), the control device 20 determines that the current detectors 5A and 5B are out of order and immediately activates the protection operation unit 91. The service operation of the elevator is suspended (step S73), and the reporting unit 92 is activated to report the occurrence of an abnormality (step S74).

  As described above, in the elevator control apparatus according to the seventh embodiment of the present invention, in addition to the features described in the first embodiment, when the offset voltage of the electronic circuit inside the current detector before operation is abnormal, When the output voltage after starting operation is abnormal, when an abnormality is detected in the output of the current detector after degaussing control, or after correction due to offset voltage change prediction based on temperature detection after degaussing control When an abnormality is detected in the offset voltage, the protection operation and the occurrence of the abnormality are reported. Therefore, the influence of the malfunction of the current detectors 5A and 5B can be prevented in advance and the safety of passengers can be secured, and the maintenance staff can respond quickly by replacing the current detectors 5A and 5B.

  The present invention is not limited to the above-described embodiment as it is, and can be embodied by modifying the constituent elements without departing from the scope of the invention in the implementation stage. Various inventions can be formed by appropriately combining a plurality of constituent elements disclosed in the embodiment. For example, some components may be omitted from all the components shown in the embodiment. Furthermore, you may combine suitably the component covering different embodiment.

  DESCRIPTION OF SYMBOLS 1 ... Three-phase alternating current power supply, 2 ... Converter apparatus, 3 ... Smoothing capacitor, 4 ... Inverter apparatus, 5A. 5B ... Current detector, 6 ... Electric motor, 7 ... Regenerative resistor, 8 ... Switching element, 11 ... Sheave, 12 ... Rope, 13 ... Ride car, 14 ... Counterweight, 15 ... Temperature sensor, 20 ... Control device, 21 , Microcomputer, 22 microcomputer control circuit, 23 degaussing circuit, 24, 27 offset voltage detection / correction circuit, 25 temperature detection circuit, 26 gate drive circuit, 28 voltage correction circuit, 30, 50 current sensor, 31, 51 ... Magnetic core, 32, 53 ... Hall element, 33, 54 ... Amplifier circuit, 34, 55 ... Conductor, 41 ... CS power supply, 42A. 42B ... Open / close switch, 43 ... Switch drive circuit, 52 ... Secondary winding, 56 ... Output resistance, 61 ... Linearity detection circuit, 71 ... Vibration detector, 81 ... Torque component current detection circuit, 91 ... Protection operation unit, 92 ... Reporting section.

Claims (7)

A rectifier circuit that converts AC power from an AC power source into DC power;
A smoothing capacitor for smoothing pulsation of DC power converted by the rectifier circuit;
An inverter that converts the smoothed DC power into AC power having a variable voltage and variable frequency and outputs the AC power;
An electric motor driven by AC power output from the inverter to raise and lower the car;
A magnetic current detector for detecting the current output from the inverter device;
A demagnetizing circuit for energizing a current for demagnetizing the residual magnetic flux of the current detector when the motor is stopped;
An offset voltage detection circuit for detecting an offset voltage of an electronic circuit inside the current detector after energization by the demagnetization circuit;
A temperature detector for detecting the temperature around the current detector;
An electronic circuit inside the current detector detected by the offset voltage detection circuit by predicting a change amount of the offset voltage of the electronic circuit inside the current detector based on the temperature detected by the temperature detector. An elevator control apparatus, comprising: a correction unit that corrects a deviation of the offset voltage due to temperature. The offset voltage detection circuit detects an offset voltage of an electronic circuit inside and outside the current detector after energization by the degaussing circuit,
The temperature detector detects the temperature around the electronic circuit inside and outside the current detector,
The correction means predicts the amount of change in the offset voltage due to the temperature by the electronic circuit inside and outside the current detector based on the temperature detected by the temperature detector, thereby detecting the offset voltage detected by the offset voltage detection circuit. The elevator control device according to claim 1, wherein a deviation due to temperature of an offset voltage of an electronic circuit inside and outside the current detector is corrected. 3. The demagnetization circuit supplies a current for demagnetization when the electric motor is stopped and the power source of the current detector is turned off. 4. Elevator control device. A rectifier circuit that converts AC power from an AC power source into DC power;
A smoothing capacitor for smoothing pulsation of DC power converted by the rectifier circuit;
An inverter that converts the smoothed DC power into AC power having a variable voltage and variable frequency and outputs the AC power;
An electric motor driven by AC power output from the inverter to raise and lower the car;
A magnetic current detector for detecting the current output from the inverter device;
A demagnetizing circuit for energizing a current for demagnetizing the residual magnetic flux of the current detector when the motor is stopped;
A normal output in which the output voltage of the electronic circuit inside the current detector is detected at the time of re-operation of the electric motor after energization by the demagnetization circuit, and the fluctuation due to temperature variation at the time of the detected voltage and the operation is taken into account. An arithmetic circuit for calculating a deviation from the voltage value;
A temperature detector for detecting the temperature around the current detector;
Based on the temperature detected by the temperature detector, a change amount due to the temperature of the offset voltage of the electronic circuit inside the current detector is predicted, and a difference between the predicted change amount and a deviation calculated by the calculation circuit is calculated. An elevator control apparatus, comprising: a correcting means for correcting a deviation due to temperature of an offset voltage of an electronic circuit inside the current detector when within a predetermined range. A vibration detector for detecting the vibration of the car,
The degaussing circuit is
The elevator control device according to any one of claims 1 to 4, wherein when the vibration value detected by the vibration detector becomes equal to or greater than a predetermined value, the current for demagnetizing is supplied. . A torque component current detection circuit for detecting a ripple component of the torque component current flowing into the motor;
The degaussing circuit is
The elevator control according to any one of claims 1 to 5, wherein when the value detected by the torque component current detection circuit is equal to or greater than a predetermined value, the current for demagnetization is supplied. apparatus. A rectifier circuit that converts AC power from an AC power source into DC power;
A smoothing capacitor for smoothing pulsation of DC power converted by the rectifier circuit;
An inverter that converts the smoothed DC power into AC power having a variable voltage and variable frequency and outputs the AC power;
An electric motor driven by AC power output from the inverter to raise and lower the car;
A magnetic current detector for detecting the current output from the inverter device;
When the output voltage detected by the output voltage detection circuit is normal when the motor is stopped and the output voltage detected by the output voltage detection circuit is normal during operation of the motor, the current is stopped after the motor is stopped. A degaussing circuit for supplying a current for demagnetizing the residual magnetic flux of the detector;
Output voltage detecting means for detecting an output voltage by an electronic circuit inside the current detector;
A temperature detector for detecting a temperature around the current detector when the electric motor is stopped;
An electronic circuit inside the current detector detected by the offset voltage detection circuit by predicting a change amount of the offset voltage of the electronic circuit inside the current detector based on the temperature detected by the temperature detector. Correction means for correcting the deviation due to the temperature of the offset voltage,
If the output voltage detected by the output voltage detection circuit when the motor is stopped is not normal, or if the output voltage detected by the output voltage detection circuit during operation of the motor is not normal, or the offset by the correction means Protection means for performing a predetermined protection operation when the voltage detected by the output voltage detection circuit after voltage correction is not normal;
An elevator control device comprising: an alarm means for reporting an abnormality occurrence of the current detector in conjunction with the protection means.

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