JP2006352965A - Electric motor drive device and elevator drive device using the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain an electric motor drive device for preventing overheating of a current limiting resistor for suppressing an inrush current to a smoothing circuit for smoothing a DC voltage obtained by rectifying an AC voltage, and an elevator drive device using the device. .
A circuit including a current limiting resistor of a device for short-circuiting a circuit including a current limiting resistor by a short-circuit means when a DC voltage obtained by smoothing the AC voltage reaches a preset voltage. A first circuit comprising a first current limiting resistor whose temperature is detected by the first switching means connected in series to the first current limiting resistor and a first circuit connected in parallel with the first circuit, and the temperature is detected by a temperature sensor The second current limiting resistor and the second circuit comprising the second opening / closing means connected in series to the second current limiting resistor, and when the detected temperature of the first current limiting resistor exceeds a predetermined value, An inrush current control circuit that opens the first opening / closing means and closes the second opening / closing means is provided.
[Selection] Figure 1

Description

  The present invention relates to an electric motor driving device and an elevator driving device using the electric motor driving device, and more particularly, to prevent overheating of a current limiting resistor that suppresses an inrush current to a smoothing circuit that smoothes a DC voltage obtained by rectifying an AC voltage. The present invention relates to an electric motor drive device and an elevator drive device using the same.

  As a driving device for this type of electric motor in the past, an AC voltage of an AC power source as an input is rectified by a converter, the rectified voltage is converted into a DC voltage smoothed by an electrolytic capacitor, and this DC voltage is converted to a desired frequency by an inverter. There is one that constitutes a voltage source inverter device that converts voltage into alternating current and supplies power to a load such as an electric motor. Then, an inrush current suppression circuit in which a current limiting resistor and a switching device are connected in parallel is inserted in the path from the converter to the electrolytic capacitor of the voltage source inverter device, and one piece of the current limiting resistor arranged close to the current limiting resistor. Some temperature sensors monitor the internal temperature rise value of the voltage source inverter device and the temperature rise value of the current limiting resistor.

According to such an electric motor drive device, the single temperature sensor can monitor the internal temperature rise value of the electric motor drive device and the temperature rise value of the current limiting resistor of the inrush current suppression circuit. There is an advantage that the drive device can be reduced in size and price (for example, see Patent Document 1).

JP 2000-184484 A (paragraph 0007 and paragraph 0014, FIG. 1 and FIG. 2)

  When the electric motor driving device disclosed in Patent Document 1 is used in an elevator driving device such as an elevator hoisting machine or an elevator door opening / closing device, the power supply is repeatedly turned on or off in the installation work of the elevator. By doing so, the current limiting resistor that suppresses the inrush current of the capacitor generates heat and enters an abnormal state. When this abnormal state is detected, the elevator driving device stops, and the elevator driving device cannot operate until the temperature of the current limiting resistor decreases.

  Further, when the switchgear that short-circuits the current limiting resistor is turned off during the operation of the elevator, the current continues to flow through the current limiting resistor, so that the temperature of the current limiting resistor rises and the elevator driving device stops. Thereby, for example, an elevator door cannot be opened and closed, and there is a problem that passengers are trapped in the car.

  The present invention has been made in view of the above-described problems.For example, the present invention avoids stopping of the motor drive device due to the temperature rise of the current limiting resistor due to repeated power-on or shut-off in elevator installation work, etc. It is an object of the present invention to obtain an electric motor driving device that avoids stopping of the electric motor driving device even when an off-fault of the opening / closing means that short-circuits the limiting resistor occurs, and an elevator driving device that uses the electric motor driving device.

  An electric motor drive device according to the present invention rectifies an AC voltage into a DC voltage by a converter, converts the rectified voltage to a DC voltage smoothed by a smoothing circuit, and converts the smoothed DC voltage to an AC of variable voltage variable frequency by an inverter. An electric motor drive device that converts the voltage into electric power and drives the electric motor to drive the electric motor, wherein a circuit including a current limiting resistor and a circuit including a short-circuit means are connected in parallel to an input or output circuit to the converter. In an electric motor drive device in which an inrush current suppression circuit is inserted, and when a DC voltage smoothed by the smoothing circuit after power-on reaches a preset voltage, the circuit including the current limiting resistor is short-circuited by the short-circuit means. The circuit including the current limiting resistor includes a first current limiting resistor whose temperature is detected by a temperature sensor and a first opening / closing hand connected in series to the first current limiting resistor. A second circuit comprising: a first circuit comprising: a second current limiting resistor connected in parallel to the first circuit, the temperature of which is detected by a temperature sensor; and a second switching means connected in series to the second current limiting resistor. And an inrush current control circuit for opening the first opening / closing means and closing the second opening / closing means when the detected temperature of the first current limiting resistor exceeds a predetermined value. It is characterized by this.

  The elevator apparatus according to the present invention rectifies an AC voltage into a DC voltage by a converter, converts the rectified voltage into a DC voltage smoothed by a smoothing circuit, and converts the smoothed DC voltage to an AC having a variable voltage variable frequency by an inverter. An elevator apparatus for supplying electric power to an electric motor that converts an electric voltage to drive an elevator, and includes an inrush current suppression circuit in which a circuit including a current limiting resistor and a circuit including a short circuit are connected in parallel to an input or output circuit to the converter. In the elevator apparatus that short-circuits the circuit including the current-limiting resistor with the short-circuit means when the DC voltage smoothed by the smoothing circuit after turning on the power reaches a preset voltage, the current-limiting resistor is A first current-limiting resistor whose temperature is detected by a temperature sensor and a first opening / closing hand connected in series to the first current-limiting resistor. A second circuit comprising: a first circuit comprising: a second current limiting resistor connected in parallel to the first circuit, the temperature of which is detected by a temperature sensor; and a second switching means connected in series to the second current limiting resistor. And an inrush current control circuit that closes the second opening / closing means when the detected temperature of the first current limiting resistor exceeds a predetermined value, and the elevator based on the output voltage of the converter. Current command changing means for outputting a command to stop the nearest floor to the inverter.

  According to the motor drive device of the present invention, the above configuration can prevent the motor drive device from stopping due to the temperature rise of the current limiting resistor due to repeated power-on or shut-off, for example, in elevator installation work or the like. effective.

  Moreover, according to the elevator drive device of the present invention, even when the elevator is traveling, there is an effect that the temperature rise of the current limiting resistor can be suppressed by traveling the elevator to the nearest floor and stopping it.

  DESCRIPTION OF EMBODIMENTS Hereinafter, preferred embodiments of a motor drive device according to the present invention will be described with reference to the accompanying drawings. For convenience of explanation, the case where the motor driving device according to the present invention is applied to an elevator door driving device will be described as an example.

Embodiment 1 FIG.
FIG. 1 is a circuit configuration diagram in which the electric motor drive device according to Embodiment 1 is applied to an elevator door drive device, and the elevator drive device based on this circuit configuration diagram is input via a circuit breaker 1. It comprises a converter 3 in which a diode for rectifying the alternating current of the AC power supply 2 is bridge-connected, a first current limiting resistor 4 inserted in an input circuit to the converter 3, and a first switch 5 as a first opening / closing means. The first circuit 6 and short-circuit means connected in parallel with the first circuit 6, that is, a switch 7 are provided. Note that the switch 7 is configured to be closed from the open state after the power is turned on, when the voltage of the electrolytic capacitor 8 reaches a preset voltage, for example, a smoothing circuit that smoothes the rectified voltage of the converter 3 described later. The switch 7 and the first circuit 6 constitute an inrush current suppression circuit 9 that suppresses an inrush current to the electrolytic capacitor 8.

  The elevator door driving apparatus includes an inverter 10 that converts the voltage of the electrolytic capacitor 8 into an alternating current having a desired frequency and voltage and outputs the alternating current. As is well known, the inverter 10 is configured by bridge-connecting a transistor and a diode as a self-extinguishing element connected in parallel, and generates an AC voltage having a desired frequency and voltage. Is applied to the electric motor 11 to control the rotational speed of the electric motor 10 and to control the opening and closing of the elevator door 12.

  The current command changing means 13 uses the secondary voltage of the power transformer 14 that uses the output voltage of the converter 3 as the primary voltage as the control voltage. The current command changing means 13 determines that the switch 7 is in an off failure when the output voltage of the converter 3 is in an abnormal state lower than a specified value. When this state occurs during the traveling of the elevator, a frequency and voltage change command is output to the inverter 10, and the inverter 10 drives and controls the electric motor 11 based on this change command, so that the elevator is the nearest. It is comprised so that it may run to the floor of this and stop, and the door 12 may be released.

  The first circuit 6 is connected in parallel with a second circuit 17 including a second current limiting resistor 15 and a second switch 16 serving as a second opening / closing means. The first switch 5 and the second switch 16 are connected to each other as will be described later. Open / close control is performed based on a control signal from the inrush current control circuit 18 that operates as described above. That is, the second circuit 17 functions as a backup circuit for the first circuit 6.

  The inrush current control circuit 18 receives the monitoring voltage of the converter voltage monitoring circuit 19 that monitors the output voltage of the converter 3, that is, the output voltage of the converter 3 as an input, and sequentially monitors the voltage of the converter 3 to obtain the first current. A fault diagnosis of a current limiting resistor constituted by the limiting resistor 4 and the second current limiting resistor 15 is performed.

  Further, the first current limiting resistor 4 and the second current limiting resistor 15 detect the heat generation temperature by the first temperature sensor 20 and the second temperature sensor 21, respectively, and the first temperature sensor 20 and the second temperature sensor 21, respectively. The detected temperature is input to the inrush current control circuit 18 and controls the opening or closing operation of the first switch 5 or the second switch 16 as will be described later. The inrush current control circuit 18 is configured to sequentially notify the information center 23 of the control status via the remote monitoring device 22.

  The elevator door driving apparatus according to Embodiment 1 is configured as described above, and the operation thereof will be described next.

  When the circuit breaker 1 is turned on when the elevator door is opened and closed in an elevator installation work or the like, the AC voltage of the AC power source 2 is converted through the first circuit 6 including the first current limiting resistor 4 and the first switch 5. 3 is rectified to a DC voltage by the converter 3. At this time, the switch 7 and the second switch 16 are opened.

  The DC voltage rectified by the converter 3 is converted into a smoothed DC voltage by the electrolytic capacitor 8 and input to the inverter 10. The inverter 10 converts the output voltage of the converter 3 into an AC voltage having a variable voltage and a variable frequency, controls the electric motor 11, and drives the elevator door 12 to open and close.

  In the elevator door driving apparatus that operates as described above, power is turned on or off repeatedly by switching on and off the circuit breaker 1 during installation work, etc., and the heat generation temperature of the first current limiting resistor 4 reaches a predetermined value. When the temperature exceeds the abnormal temperature, the inrush current control circuit 18 operates as in the flowchart shown in FIG.

  That is, the abnormal temperature is detected by the first temperature sensor 20, and a detection signal is input to the inrush current control circuit 18 (step 21). When the detected temperature is compared with a predetermined value (step 22) and is higher than the predetermined value, the inrush current control circuit 18 opens the first switch 5 and closes the second switch 16 (step 23). Thus, the second circuit 17 is inserted in the input circuit to the converter 3 instead of the first circuit 6. The inrush current control circuit 18 sequentially reports the control status to the information center 23 via the remote monitoring device 22 (step 24).

  That is, the heat generation of the first current limiting resistor 4 is detected, the inrush current control circuit 18 is controlled so that the first switch 5 is turned off and the second switch 16 is turned on, and the second current limiting resistor 15 for backup is switched. As a result, the first current limiting resistor 4 can be prevented from becoming an abnormal temperature, and the operation of repeatedly turning on or off the power can be performed.

  When the power is turned on again when the converter voltage is low to some extent, the inrush current control circuit 18 controls the second switch 16 so that the second switch 16 is turned on while the first switch 5 is turned on. By using the second current limiting resistor 15 in combination, heat generation of the first current limiting resistor 4 can be suppressed, and burning of the first current limiting resistor 4 can be prevented.

  As described above, according to the first embodiment, when the detected temperature of the first current limiting resistor 4 exceeds a predetermined value, the first switch 5 of the first circuit 6 is opened, and the first circuit 6 Since the inrush current control circuit 18 for closing the second switch 16 of the second circuit 17 connected in parallel is provided, even if the temperature of the first current limiting resistor 4 rises above a specified value, the first switch 5 1 The current limiting resistor is opened and the second switch 16 is closed. As a result, the electrolytic capacitor 8 is charged via the second current limiting resistor 15. Therefore, even if the power supply is turned on or off repeatedly during installation work or the like, there is an effect that it is possible to avoid stopping the elevator door drive device due to the temperature rise of the first current limiting resistor 4.

Embodiment 2. FIG.
Next, a second embodiment will be described. A circuit configuration diagram in which the motor drive device according to the second embodiment is applied to an elevator door opening and closing device is the same as that in FIG.

  In the first embodiment, the inrush current control circuit 18 opens the first switch 5 of the first circuit 6 and the first circuit 6 when the heat generation temperature of the first current limiting resistor 4 exceeds a predetermined value. Although the second switch 16 of the second circuit 17 connected in parallel is operated to close, the second embodiment sequentially monitors the converter voltage, so that the first current limiting resistor 4 and the second switch 16 are connected to each other. An embodiment for performing failure diagnosis of a current limiting resistor constituted by the current limiting resistor 15 will be described.

  That is, in the time chart of FIG. 3, (a) represents a power-on signal, (b) represents a converter voltage, (c) represents a failure detection signal, and (d) represents a backup switching command signal, as shown in this time chart. If the converter voltage does not rise to a predetermined value even after the power is turned on, it is diagnosed that the first current limiting resistor 4 is out of resistance and is controlled by the inrush current control circuit 18 so as to close the second switch 16 of the second circuit 17. Then, the power supply is turned on by switching to the second current limiting resistor 15 for backup.

  The inrush current control circuit 18 of the second embodiment operates as shown in the flowchart of FIG. That is, when the power supply is turned on or off repeatedly during installation work or the like, even if the circuit breaker 1 is turned on and the output voltage of the converter 3 does not reach a predetermined value, the converter voltage monitoring circuit 19 detects the abnormality. The detected signal is input to the inrush current control circuit 18 (step 41). The input signal is compared with a predetermined value (step 42). If the input signal is lower than the predetermined value, the inrush current control circuit 18 closes the second switch 16 (step 43). Thus, the second circuit 17 is inserted in the input circuit to the converter 3 instead of the first circuit 6. The inrush current control circuit 18 sequentially reports the control status to the information center 23 via the remote monitoring device 22 (step 44).

  As described above, according to the second embodiment, the converter voltage monitoring circuit 19 sequentially monitors the converter voltage, and the first current limiting resistor 4 and the second current limiting resistor 15 use the monitoring signal from the converter voltage monitoring circuit 19. Since the failure diagnosis of the configured current limiting resistor is performed, the electrolytic capacitor 8 is charged via the second current limiting resistor 15 even if the first current limiting resistor 4 is disconnected. Therefore, even if the converter voltage does not increase even after the power is turned on during installation work or the like, it is possible to detect the state, and even if the first current limiting resistor 4 is out of resistance, it is possible to avoid stopping the elevator door drive device. effective.

Embodiment 3 FIG.
Next, Embodiment 3 will be described. A circuit configuration diagram in which the motor drive device according to the third embodiment is applied to an elevator door opening and closing device is the same as that in FIG.

  In the second embodiment, failure diagnosis of the current limiting resistor constituted by the first current limiting resistor 4 and the second current limiting resistor 15 is performed by sequentially monitoring the converter voltage. An embodiment will be described in which an off-fault diagnosis of the switch 7 is performed when the first current limiting resistor 4 continues to generate heat even after the converter voltage rises after the power is turned on.

  In the time chart of FIG. 5, (a) is a power-on signal, (b) is a converter voltage, (c) is a temperature rise signal of the first current limiting resistor, (d) is a failure detection signal, and (e) is a backup combination. As shown in this time chart, if the first current limiting resistor 4 continues to generate heat even after the converter voltage has risen to a predetermined value after the power is turned on, the switch 7 is diagnosed as an off failure, and the first The inrush current control circuit 18 controls the second switch 16 so that the second switch 16 is closed while the switch 5 is closed, and the heat generation of the first current limiting resistor 4 is achieved by using the backup second current limiting resistor 15 together. It suppresses.

The inrush current control circuit 18 of the third embodiment operates as shown in the flowchart of FIG. That is, when power is repeatedly turned on and off during installation work, the first current limiting resistor 4 generates heat even after the circuit breaker 1 is turned on and the output voltage of the converter 3 reaches a predetermined value. When continuing, that is, when the switch 7 is in an OFF failure, the detection signal of the first temperature sensor 20 is input to the inrush current control circuit 18 (step 61). The input signal is compared with a predetermined value (step 62). If the input signal is higher than the predetermined value, the inrush current control circuit 18 closes the second switch 16 with the first switch 5 closed (step 63). Thereby, the parallel circuit of the 1st circuit 6 and the 2nd circuit 17 is inserted in the input circuit to the converter 3, and the heat_generation | fever of the 1st current limiting resistor 4 is suppressed. The inrush current control circuit 18 sequentially reports the control status to the information center 23 via the remote monitoring device 22 (step 64).

  As described above, according to the third embodiment, when the first current limiting resistor 4 continues to generate heat even after the converter voltage has increased to a predetermined value after the power is turned on, the inrush current control circuit 18 outputs the output voltage of the converter 3. Is monitored by the converter voltage monitoring circuit 19, and when the monitoring result is abnormal, the switch 7 is diagnosed as an off-fault and a parallel circuit of the first circuit 6 and the second circuit 17 is inserted into the input circuit to the converter 3. . As a result, the electrolytic capacitor 8 can be charged via the parallel circuit of the first circuit 6 and the second circuit 17 and the heat generation of the first current limiting resistor 4 can be suppressed. Therefore, even when an OFF failure of the switch 8 occurs, it is possible to detect the state and avoid stopping the drive device for the elevator door.

Embodiment 4 FIG.
Next, a fourth embodiment will be described. FIG. 7 is a circuit configuration diagram in which the motor drive device according to the fourth embodiment is applied to an elevator door opening / closing device. The difference from FIG. 1 is that the output signal 70 of the inrush current control circuit 18 is applied to the current command changing means 13. This is the point to be entered. 8 is a time chart of the fourth embodiment. In the time chart of FIG. 7, (a) is a power-on signal, (b) is a converter voltage, and (c) is a temperature rise signal of the first current limiting resistor. , (D) represents a failure detection signal, (e) represents a backup combined command signal, and (f) represents a low-speed door opening command signal.

  When the first current limiting resistor 4 starts to generate heat again during normal operation of the elevator and its temperature becomes higher than a predetermined value, as described in the third embodiment, the off-fault signal of the switch 7 is an inrush current control circuit. The inrush current control circuit 18 inserts a parallel circuit of the first circuit 6 and the second circuit 17 into the input circuit to the converter 3. As a result, the electrolytic capacitor 8 is charged through the parallel circuit of the first circuit 6 and the second circuit 17, and the heat generation of the first current limiting resistor 4 is suppressed.

  On the other hand, the inrush current control circuit 18 outputs a signal 70 to the current command changing means 13 as an OFF failure signal of the switch 7. Thereby, the current command changing means 13 instructs the inverter 10 to stop the elevator at the nearest floor and open the door at a low speed, and the inverter 10 controls the electric motor 11. The inrush current control circuit 18 reports an off failure of the switch 8 to the information center 23 via the remote monitoring device 22.

  As described above, according to the fourth embodiment, when the inrush current control circuit 18 diagnoses the OFF failure of the switch 8, the inrush current control circuit 18 suppresses the heat generation of the first current limiting resistor 4, and the current command changing means 13 includes the switch 8. The diagnosis result of the off-fault is output, and the elevator can be stopped at the nearest floor to open the door at low speed.

  In each of the above-described embodiments, the present invention is applied to an elevator door drive device. However, the present invention can be applied to other applications. This is particularly effective when it is necessary to repeatedly turn on or off the power during installation work, such as an elevator drive device.

In each of the above embodiments, the case where an inrush current suppression circuit in which a circuit including a current limiting resistor and a circuit including a short-circuit means are connected in parallel is inserted in the converter input circuit is illustrated and described. Even if it is inserted in the circuit, the same effect can be obtained.

  An electric motor drive device and an elevator drive device using the device according to the present invention, for example, when it is necessary to repeatedly turn the power on or off in installation work, etc. Since it is possible to avoid stopping the drive device of the electric motor, industrial applicability is great.

It is a circuit block diagram of the drive device of the elevator door which concerns on Embodiment 1 of this invention. It is a flowchart explaining operation | movement of the drive device of the elevator door which concerns on Embodiment 1 of this invention. It is a time chart of each signal in the drive device of the elevator door which concerns on Embodiment 2 of this invention. It is a flowchart explaining operation | movement of the drive device of the elevator door which concerns on Embodiment 2 of this invention. It is a time chart of each signal in the drive device of the elevator door which concerns on Embodiment 3 of this invention. It is a flowchart explaining operation | movement of the drive device of the elevator door which concerns on Embodiment 3 of this invention. It is a circuit block diagram of the drive device of the elevator door which concerns on Embodiment 4 of this invention. It is a time chart of each signal in the drive device of the elevator door which concerns on Embodiment 4 of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Circuit breaker 2 AC power supply 3 Converter 4 1st current limiting resistor 5 1st switch 6 1st circuit 7 Switch 8 Electrolytic capacitor 9 Inrush current suppression circuit 10 Inverter 11 Electric motor 12 Elevator door 13 Current command change means 14 Power supply transformer 15 1st 2 Current Limiting Resistor 16 Second Switch 17 Second Circuit 18 Inrush Current Control Circuit 19 Converter Voltage Monitoring Circuit 20 First Temperature Sensor 21 Second Temperature Sensor 22 Remote Monitoring Device 23 Information Center

Claims (6)

The AC voltage is rectified to a DC voltage by a converter, the rectified voltage is converted to a DC voltage smoothed by a smoothing circuit, the smoothed DC voltage is converted to an AC voltage of variable voltage and variable frequency by an inverter, and the motor is fed. An electric motor drive device for driving the electric motor,
An inrush current suppression circuit in which a circuit including a current limiting resistor and a circuit including a short-circuit means are connected in parallel to the input or output circuit to the converter, and a DC voltage smoothed by the smoothing circuit after power-on is preset. In the motor drive device for short-circuiting the circuit including the current limiting resistor by the short-circuit means when the voltage reaches
A circuit including the current limiting resistor includes a first circuit including a first current limiting resistor whose temperature is detected by a temperature sensor, and first opening / closing means connected in series to the first current limiting resistor, and the first circuit; A second current limiting resistor connected in parallel and having a temperature detected by a temperature sensor, and a second circuit comprising second opening / closing means connected in series to the second current limiting resistor, and further comprising the first current limiting An electric motor drive device comprising: an inrush current control circuit that opens the first opening / closing means and closes the second opening / closing means when a resistance detection temperature exceeds a predetermined value. The AC voltage is rectified to a DC voltage by a converter, the rectified voltage is converted to a DC voltage smoothed by a smoothing circuit, the smoothed DC voltage is converted to an AC voltage of variable voltage and variable frequency by an inverter, and the motor is fed. An electric motor drive device for driving the electric motor,
An inrush current suppression circuit in which a circuit including a current limiting resistor and a circuit including a short-circuit means are connected in parallel to the input or output circuit to the converter, and a DC voltage smoothed by the smoothing circuit after power-on is preset. In the motor drive device for short-circuiting the circuit including the current limiting resistor by the short-circuit means when the voltage reaches
A circuit including the current limiting resistor includes a first circuit including a first current limiting resistor whose temperature is detected by a temperature sensor, and first opening / closing means connected in series to the first current limiting resistor, and the first circuit; A second current limiting resistor connected in parallel and having a temperature detected by a temperature sensor, and a second circuit comprising second opening / closing means connected in series to the second current limiting resistor, and further comprising the first current limiting When the resistance detection temperature exceeds a predetermined value, the first opening / closing means is opened to close the second opening / closing means, and when the detection temperature of the second current limiting resistor exceeds a predetermined value. An electric motor drive device comprising an inrush current control circuit for opening the second opening / closing means and closing the first opening / closing means.   3. The inrush current control circuit according to claim 1, wherein the first opening / closing means and the second opening / closing means are both closed when the output voltage of the converter is lower than a predetermined value. Electric motor drive device. The AC voltage is rectified to a DC voltage by a converter, the rectified voltage is converted to a DC voltage smoothed by a smoothing circuit, the smoothed DC voltage is converted to an AC voltage of variable voltage and variable frequency by an inverter, and the motor is fed. An electric motor drive device for driving the electric motor,
An inrush current suppression circuit in which a circuit including a current limiting resistor and a circuit including a short-circuit means are connected in parallel to the input or output circuit to the converter, and a DC voltage smoothed by the smoothing circuit after power-on is preset. In the motor drive device for short-circuiting the circuit including the current limiting resistor by the short-circuit means when the voltage reaches
A circuit including the current limiting resistor includes a first circuit including a first current limiting resistor whose temperature is detected by a temperature sensor, and first opening / closing means connected in series to the first current limiting resistor, and the first circuit; A second current limiting resistor connected in parallel and having a temperature detected by a temperature sensor, and a second circuit comprising a second switching means connected in series to the second current limiting resistor, and further comprising the first switching means An inrush current control circuit for closing the second opening / closing means from the open state when the voltage value of the smoothing circuit does not reach a predetermined value even after a predetermined time has elapsed after the smoothing circuit starts charging. An electric motor drive device comprising the motor drive device. The AC voltage is rectified to a DC voltage by a converter, the rectified voltage is converted to a DC voltage smoothed by a smoothing circuit, the smoothed DC voltage is converted to an AC voltage of variable voltage and variable frequency by an inverter, and the motor is fed. An electric motor drive device for driving the electric motor,
An inrush current suppression circuit in which a circuit including a current limiting resistor and a circuit including a short-circuit means are connected in parallel to the input or output circuit to the converter, and a DC voltage smoothed by the smoothing circuit after power-on is preset. In the motor drive device for short-circuiting the circuit including the current limiting resistor by the short-circuit means when the voltage reaches
A circuit including the current limiting resistor includes a first circuit including a first current limiting resistor whose temperature is detected by a temperature sensor, and first opening / closing means connected in series to the first current limiting resistor, and the first circuit; A second current limiting resistor connected in parallel and having a temperature detected by a temperature sensor, and a second circuit comprising a second switching means connected in series to the second current limiting resistor, and further comprising the first switching means And an inrush current control circuit for closing the second opening / closing means when the voltage value of the smoothing circuit reaches a predetermined value and the detected temperature of the first current limiting resistor exceeds the predetermined value. An electric motor drive device comprising the motor drive device. An electric motor that drives an elevator by rectifying an AC voltage into a DC voltage by a converter, converting the rectified voltage into a DC voltage smoothed by a smoothing circuit, and converting the smoothed DC voltage to an AC voltage having a variable voltage and a variable frequency by an inverter. An elevator device for supplying power to
An inrush current suppression circuit in which a circuit including a current limiting resistor and a circuit including a short-circuit means are connected in parallel to the input or output circuit to the converter, and a DC voltage smoothed by the smoothing circuit after power-on is preset. In the elevator apparatus that short-circuits the circuit including the current limiting resistor with the short-circuit means when the voltage reaches
A circuit including the current limiting resistor includes a first circuit including a first current limiting resistor whose temperature is detected by a temperature sensor, and first opening / closing means connected in series to the first current limiting resistor, and the first circuit; A second current limiting resistor connected in parallel and having a temperature detected by a temperature sensor, and a second circuit comprising second opening / closing means connected in series to the second current limiting resistor, and further comprising the first current limiting When the detected temperature of the resistance exceeds a predetermined value, an inrush current control circuit for closing the second switching means and a command for stopping the elevator to the nearest floor based on the output voltage of the converter are output to the inverter And an electric current command changing means.

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