JP2002114455A - Control device of elevator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an elevator control device capable of thermally protecting motor by constantly computing coil temperature of the direct current motor and high in reliability. SOLUTION: This control device is devised to furnish a control circuit to restrict driving of an elevator by the computed coil temperature of the direct current motor.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an elevator control apparatus which achieves thermal protection and controllability of a DC elevator motor against an increase in winding temperature.

[0002]

2. Description of the Related Art A motor for driving an elevator is thermally protected from a rise in temperature of windings caused by the operation of the motor.
There is an elevator control device disclosed in Japanese Patent Application Laid-Open No. 62-290687. According to this technology, a temperature detector is installed inside or outside the motor, the temperature detector is set to a predetermined temperature value, and when the temperature exceeds a predetermined temperature, a temperature detection relay is operated, and thereafter the frequency of driving the motor is adjusted. With this, the motor is thermally protected.

[0003]

However, the method disclosed in Japanese Patent Application Laid-Open No. 62-290687 is particularly effective when the existing DC motor is left as it is to make a new system, especially when performing renovation work. Next, a temperature detector is attached to the winding to be protected inside the motor for thermal protection. For this reason, it is necessary to remodel the motor on site, but the remodeling takes a lot of time, and there are problems that the motor cannot be mounted depending on the structure of the motor.

In addition, even when a temperature detector is mounted on the outer edge of a motor which is relatively easily modified to provide thermal protection for an existing DC motor, even if the temperature detector is mounted on the outer edge of the motor, the internal temperature of the motor may be reduced due to a rise in external temperature. It has been difficult to obtain a coefficient for estimating the rise of the water. The present invention has been made in order to solve such a problem, and provides an elevator control device that constantly calculates a winding temperature of a DC motor and achieves thermal protection and improvement in controllability against an increase in winding temperature. Is what you do.

[0005]

An elevator control apparatus according to the present invention comprises: a DC motor for driving and controlling an elevator; a temperature measuring means for constantly measuring the temperature of a winding of the DC motor during operation of the elevator; A control circuit for controlling the operation of the elevator using the temperature signal from the temperature measuring means.

Here, the control circuit separates the temperature of the winding into a plurality of temperature levels based on a temperature signal from the temperature measuring means, and controls the operation of the elevator corresponding to each temperature level.

[0007] The elevator control apparatus of the present invention may have a notifying means for receiving a signal from the control circuit and informing the passenger of the operating status of the elevator.

Further, the elevator control device of the present invention may have a notifying means for receiving a signal from the control circuit and informing the elevator manager or the management company of the operating status of the elevator.

The elevator control apparatus according to the present invention further comprises an outside air temperature measuring means for measuring the outside air temperature of the DC motor,
Winding initial constant detecting means for measuring the winding resistance of the DC motor at the time of initial operation at elevator start-up, and winding constant storing means for storing measured value data of the winding initial constant detecting means and the outside air temperature measuring means May be provided.

The control circuit includes a speed detecting means for detecting a rotation speed of the DC motor, a torque detecting means for detecting a torque of the DC motor, a voltage command generating means for outputting a predetermined voltage to the DC motor, May be provided with winding constant detecting means for constantly detecting the winding resistance of the DC motor based on the above.

The control circuit may have a winding temperature detecting means for calculating a winding temperature of the DC motor by means of a winding constant storing means and a winding constant detecting means.

Further, the control circuit may include winding safety determining means for determining the thermal safety of the DC motor by comparing the winding temperature detected by the winding temperature detecting means with a predetermined reference temperature. .

[0013] The control circuit may include a start-up limiting unit that limits the start-up of the elevator using the output signal of the winding safety determination unit to ensure the safety of the winding of the DC motor.

Further, the control circuit may include control means for controlling the operation of the elevator using the latest winding resistance information from the winding constant detecting means.

[0015]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiment 1 Hereinafter, Embodiment 1 of the present invention will be described with reference to FIG. FIG. 1 is a configuration diagram of a DC elevator control device according to an embodiment of the present invention.

In FIG. 1, reference numeral 1 denotes a three-phase AC power supply;
The three-phase AC power supply 1 controls a converter 2 for converting AC power to DC, a smoothing capacitor 3a for smoothing the DC power output of the converter 2, and on / off control of the DC power of the smoothing capacitor 3a. A DC chopper circuit 3 that outputs a variable DC voltage is connected in series. DC
Connected to the chopper circuit 3 are a DC motor 4 for raising and lowering an elevator car, a speed detector 5a for detecting the rotation speed of the DC motor 4, and a speed detection circuit 5 receiving a detected speed signal from the speed detector 5a. ing. The DC motor 4 is connected to a current detector 6a for detecting the current, and a current detection circuit 6 for receiving a detection current from the current detector 6a.

The DC motor 4 includes a sheave 7 that is rotated by the DC motor 4, a cage 8 attached to one end of a rope wound around the sheave 7, and a cage 8.
Is provided with a counterweight 9 connected to the other end of the rope connected to the other end.

Further, a pattern generation circuit 12 for generating an operation speed pattern of the car 8 based on each up and down operation state of the car 8, a speed based on information from the pattern generation circuit 12, the speed detection circuit 5 and the current detection circuit 6. A control circuit 13 for arithmetically controlling the command is provided. A PWM circuit 14 that controls on / off of a switching element of the DC chopper circuit 3 based on an output signal of the control circuit 13, and a base of the switching element of the DC chopper circuit 3 is driven based on an output signal of the PWM circuit 14. A base drive circuit 15 is provided. Note that these pattern generation circuits 1
2, control circuit 13, PWM circuit 14, base drive circuit 1
5 constitute an elevator control unit 11.
The elevator control unit 11 controls the operation of the elevator.

When the control circuit 13 restricts the activation of the elevator, the control circuit 13 notifies the passenger of the fact by display or announcement.
Is connected. Further, the control circuit 13 is connected to a notifying unit 31 for notifying the elevator administrator of the winding abnormality of the DC motor 4.

FIG. 2 is a block diagram showing the detailed functions of the control circuit 13. As shown in FIG. The control circuit 13 includes the speed control means 2
1 is provided. The speed control means 21 controls the speed based on an operation speed pattern command generated by the pattern generation circuit 12 and a signal from the speed detection circuit 5.

Further, a torque control means 22 for controlling a required torque of the motor based on an output from the speed control means 21 and an output signal from the current detection circuit 6 is provided. Further, a voltage command generating means 23 is provided for calculating a command value of a voltage to be applied to the DC motor 4 based on an output from the torque control means 22 and an output signal from the speed detection circuit 5.

The voltage command generating means 23 outputs a signal to the PWM circuit 14 for controlling on / off of the switching element of the DC chopper circuit 3 described above with reference to FIG. 1 and a winding constant detecting means 26 described later. It has become.

The control circuit 13 is provided with a winding initial constant detecting means 24 for measuring the winding resistance of the DC motor 4 based on a signal from the current detecting circuit 6 as part of the initial setting of the control system.

Further, the control circuit 13 is provided with an outside air temperature measuring means 32 for taking in a value measured by a temperature detector 33 for detecting the temperature around the outside of the DC motor 4.

The temperature detector 33 is arranged around the outside of the DC motor 4 and is connected to the outside air temperature measuring means 32 in the control circuit 13. Further, in the control circuit 13, there is provided a winding constant storage means 25 for storing the measured temperature value from the outside air temperature measuring means 32 and the resistance value calculated by the above-mentioned winding initial constant detecting means 24.

The control circuit 13 uses the stored value of the winding constant storage means 25, the signals of the speed detection circuit 5 and the current detection circuit 6, and the output signal value of the voltage command generation means 23 to control the winding of the DC motor 4. Winding constant detection means 2 for calculating wire resistance
6 are provided.

The control circuit 13 is provided with a winding temperature detecting means 27 for calculating the temperature of the winding of the DC motor 4 from the winding resistance value calculated by the winding constant detecting means 26.

Winding safety determining means for comparing the winding temperature calculated by the winding temperature detecting means 27 with a preset temperature set to determine whether the winding has a thermal problem such as burnout or insulation deterioration. 28 is provided in the control circuit 13.
Based on the output of the comparison determination result of the winding safety determination means 28, the activation of the elevator operation is limited and the DC motor 4
A start restricting means 29 for ensuring the thermal safety of the apparatus is provided.

Further, from the activation restricting means 29, a signal output to a notifying means 31 for displaying or announcing to the passenger that the activation of the elevator operation has been restricted is provided, and an abnormal winding of the DC motor 4 is controlled by the elevator. And a signal output to the notifying means 30 for notifying the user.

FIG. 3 is a flowchart showing the operation of the elevator control device. The operation of the elevator control device will be described with reference to FIGS.

As shown in FIG. 3, first, in the winding initial measurement mode selection operation step (S40), it is determined whether or not the winding initial measurement mode is set. This determination operation must be performed at least once for the initial setting after the equipment is installed on site. In this case, immediately after the power is turned on, the winding initial measurement mode is selected under the condition that the winding temperature is equal to the outside air temperature, that is, the ambient temperature.

Here, when the winding initial measurement mode is selected, the operation proceeds to the winding initial resistance measurement storage operation step (S41). Incidentally, the operation of the winding initial resistance measurement storage operation step (S41) is executed with the basket forcibly stopped by the brake for improving accuracy.

Now, the initial winding measurement mode is selected,
When the winding initial resistance measurement storage operation step (S41) is entered, first, the constant value voltage E is
It is output to the WM circuit 14 and the winding initial constant detecting means 2
4 receives the signal I from the current detection circuit 6 at that time,
The initial resistance R of the winding is calculated. The initial resistance R is obtained based on the following equation (1). R = E / I --- (1)

Here, the voltage constant K of the DC motor 4 is calculated while the car is forcibly stopped by the brake. The voltage constant K is, as shown in the following equation (2), the rated voltage V
It is determined according to the type of the hoist from n, the rated current In, and the rated rotation speed Nn. K = (Vn−In × R) / (2π × Nn / 60) Equation (2)

Here, it is desirable that the voltage E output from the voltage command generating means 23 has an appropriate value such that an excessive load is not applied to the brake due to the generated rotational torque of the motor. Thus, according to the equation (1) of the winding initial constant detecting means 24,
The obtained initial resistance R is stored in the winding constant storage means 25.
Next, the outside air temperature measured by the outside air temperature measurement unit 32 by the temperature detector 33 is stored in the winding constant storage unit 25. Thereby, the winding initial resistance measurement storage operation step (S4
The operation of 1) ends, and a series of operations ends.

Next, if the winding initial measurement mode selection operation step (S40) is not the winding initial measurement mode, the process proceeds to the winding temperature measurement operation step (S42), and the winding temperature is measured in the normal operation mode. Is measured.

This winding temperature measurement operation step (S42)
, The winding constant detecting means 26 calculates the speed signal ω from the speed detecting circuit 5, the current signal I from the current detecting circuit 6, and the output voltage E from the voltage command generating means 23.
The winding resistance Rs is obtained using the following equation (3). Rs = (E−K × ω) / I (3)

Next, the winding temperature detecting means 27 calculates the winding resistance Rs calculated by the winding constant detecting means 26, the resistance value R stored in the winding constant storing means 25 and the temperature detection. Using the initial outside air temperature value Tn and the temperature coefficient measured by the outside air temperature measuring means 32 by the heater 33, the winding temperature T is obtained by the following equation (4). T = Rs / R × (234.5 + Tn) -234.5 --- Equation (4)

As described above, in the winding temperature measuring operation step (S42), the winding temperature detecting means 27 measures the winding temperature T, and then proceeds to the winding temperature first level determining operation step (S43). The winding safety determination means 28 determines whether the winding temperature is equal to or higher than the first level temperature. In this embodiment, the winding safety determining means 28 has first and second level temperatures as set temperature values as set temperatures for safety determination, for example, the first level is the second level. Is set higher than the set temperature of.

If it is determined in the winding temperature first level determination operation step (S43) that the winding temperature is equal to or higher than the first level, the operation proceeds to the operation determination operation step (S44), and the current elevator is operated. It is determined whether or not is operating. Here, whether or not the elevator is currently operating is determined by the control circuit 13.
The determination is made based on the output pattern of the pattern generation circuit 12 within.

Then, this operation determination step (S)
If it is determined in 44) that the elevator is not currently operating, the process proceeds to a no-call answering operation step (S45), and the activation restricting means 29 accepts no response to the call to the car 8 at all. Instead, the operation of the elevator is stopped as it is. That is, when the car 8 is stopped, even if a call is generated, the stop is continued without responding to the call.

In addition, a driving determination operation step (S44).
When it is determined that the elevator is currently operating,
Next, proceeding to the nearest floor driving operation step (S46), the activation restricting means 29 decelerates and stops the car 8 to the nearest floor,
Stop the operation of the elevator.

That is, if the winding temperature of the DC motor 4 is determined by the winding safety determining means 28 to be equal to or higher than a predetermined value, the starting restricting means 29 determines that the car 8 is running and the current Regardless of the above, an operation command for decelerating and stopping the car 8 to the nearest floor is output to the pattern generation circuit 12, and the car 8 is stopped at the nearest floor.

Next, if it is determined in the aforementioned winding temperature first level determination operation step (S43) that the winding temperature is equal to or lower than the first level set temperature, the winding temperature second level determination operation is performed. Proceeding to step (S47), the winding safety determining means 28 determines whether the winding temperature is equal to or higher than the second level temperature.

Here, as a result of this determination, the winding temperature becomes the second
When the temperature is equal to or higher than the level, the process proceeds to a start interval setting operation step (S48), and the start restricting means 29 takes a longer time from when the car 8 is stopped to when it is started, that is, a stop time of the car 8, and the elevator operation By increasing the start interval, the ratio of the time of energization to the windings of the DC motor 4 is reduced, and an operation for reducing the temperature rise of the windings is performed.

Thereafter, the process proceeds to a passenger display announcement operation step (S49), in which the notifying means 30 displays to the passenger that the activation interval of the elevator operation has been extended,
And an announcement is made and the passenger is notified to that effect.

Similarly, after performing the above-described nearest floor driving operation step (S46), the notification means 30 notifies the passenger of a report of stopping the car 8 to the nearest floor by an announcement or display.

Similarly, after executing the above-described call non-answering operation step (S45), the notification means 30 does not accept any response to the elevator call, that is, the fact that the car 8 cannot be operated. Notify passengers of the report by announcement or display.

Next, an administrator report operation step (S5)
0), the notification means 31 similarly performs the above-described activation interval setting operation step (S48),
The fact that the startup interval of elevator operation has been extended,
Notify the elevator management company or administrator.

Next, the notification means 31 similarly informs the elevator management company or the administrator that the car 8 has been decelerated and stopped to the nearest floor after the execution of the above-described nearest floor driving operation step (S46). report.

Next, similarly, after executing the above-described call non-answering operation step (S45), the notifying means 31 continues to receive no response to the elevator call, that is, to continue with the car 8. Notify the elevator management company or the administrator that the vehicle has been stopped and cannot be operated.

If it is determined in the aforementioned winding temperature second level determination operation step (S47) that the winding temperature is not equal to or higher than the second level, this operation is terminated here. A series of operations ends. After the above-described administrator notification operation step (S50) is executed, the operation is ended there, and a series of step operations of the elevator control device is ended.

As described above, according to this elevator control device, the winding temperature of the DC motor can always be calculated, so that the thermal protection of the DC motor can be promptly performed regardless of the operation. The effect that a highly reliable elevator apparatus can be provided is obtained.

Further, the calculated winding temperature of the DC motor is divided into a plurality of temperature levels, and the elevator operation is restricted in accordance with each of the divided temperature levels. The safe state can be maintained, and the operation can be performed without lowering the operation efficiency of the elevator as much as possible.

In addition, the system is provided with a means for receiving the information of the control circuit for restricting the operation of the elevator and informing the passenger of the operation status of the elevator based on the information, so that the stop of the elevator operation and the refuge operation to the nearest floor can be performed. Even in the case of occurrence, the situation can be promptly notified to the passenger, and driving that provides a sense of security to the passenger can be performed.

Further, a notifying means for receiving the information of the control circuit for restricting the operation of the elevator and notifying the elevator operating status based on the information to the elevator manager or the management company is provided. Even if a slammed drive to the floor occurs, the situation can be immediately reported to the manager or the management company, and the driver can be provided with a sense of security for the passengers and prompt action by the management company.

Further, an outside air temperature measuring means for measuring the outside air temperature of the DC motor, a winding initial constant detecting means for measuring the winding resistance of the DC motor at an initial operation stage when the elevator is started, an outside air temperature measuring means, Since it is provided with winding constant storage means for storing measurement value data measured by the winding initial constant detection means, it is possible to measure winding resistance and outside air temperature at the initial stage of the DC motor, and further store I can put it.

Further, since the winding constant detecting means for constantly detecting the winding resistance of the DC motor by means of the speed detecting means for detecting the rotation speed of the DC motor, the torque detecting means and the voltage command generating means, is provided. The winding resistance can always be calculated.

Further, since the winding temperature detecting means for calculating the temperature of the winding of the DC motor by means of the winding constant storing means and the winding constant detecting means is provided, the temperature of the winding of the DC motor can be constantly maintained during operation. Can be calculated.

Further, there is provided a winding safety determining means for determining the thermal safety of the winding of the DC motor by comparing the temperature difference between the temperature detected by the winding temperature detecting means and a predetermined temperature. Therefore, it can be determined whether the winding temperature is safe regardless of the operation, and the safety of the elevator operation can be improved.

In addition, starting limiting means for limiting the starting of the elevator in accordance with output data of the winding safety determining means for determining the thermal safety of the windings of the DC motor to ensure the safety of the windings of the DC motor. Therefore, it is possible to determine whether or not the winding temperature is safe regardless of the operation, and it is possible to limit the start of the elevator operation based on the determination, so that efficient operation can be performed.

Further, it is possible to provide a highly reliable elevator apparatus capable of quickly protecting the DC motor regardless of the operation.

Embodiment 2 Hereinafter, a second embodiment of the present invention will be described with reference to FIG. In FIG. 2, the control circuit 13 includes the storage value of the winding constant storage means 25, the signals of the speed detection circuit 5 and the current detection circuit 6, and the voltage command generation means 23.
A winding constant detecting means 26 for calculating the resistance of the winding of the DC motor 4 based on the output signal value from the DC motor 4 is provided.

Further, the configuration and operation of each of the other units are the same as those in the first embodiment, and thus detailed description is omitted. here,
In FIG. 2, as described above in the first embodiment, the winding constant detecting means 26 can always calculate the winding resistance Rs of the DC motor 4 in the normal operation mode of the elevator.

Further, the torque control means 22 and the speed control means 21 of FIG. 2 operate the elevator using the value of the winding resistance Rs calculated by the winding constant detection means 26 as an input value. .

The equation for calculating the voltage constant K of the DC motor 4 described in the first embodiment is obtained by the same equation (2) as in the first embodiment.

Here, in place of the initial resistance R in the equation (2) according to the first embodiment, the value of the winding resistance Rs calculated by the winding constant detecting means 26 is substituted as an input value.
The voltage constant obtained by the substitution result is represented by the voltage constant Ks
As in equation (2) of the first embodiment, the following equation (5) can be newly created. Ks = (Vn−In × Rs) / (2π × Nn / 60) Equation (5)

By using the equation (5), the Ks value of the voltage constant Ks always calculated in the normal operation of the elevator is always used again as re-input data by the torque control means 22 and the speed control means 21 in FIG. By performing the above operation, control circuit means having higher operation controllability can be obtained, and an elevator apparatus capable of performing operation with high accuracy acceleration / deceleration and landing accuracy can be provided.

That is, since the constant Ks with higher precision can be used by always replacing the winding resistance with the newly calculated resistance value Rs, it is possible to control the elevator drive with higher precision.

As described above, the resistance value of the winding is always calculated by the winding constant detecting means of the DC motor, and the calculated resistance value of the winding is used again as the re-input data, whereby the control having higher operation controllability is performed. Since the circuit means is obtained, it is possible to provide an elevator apparatus capable of performing highly accurate acceleration / deceleration and landing precision operation.

[0071]

As described above, the elevator control apparatus according to the present invention has the following effects. The elevator control device according to the present invention includes a control circuit that constantly calculates the winding temperature of the DC motor during the elevator operation and limits the operation of the elevator according to the calculated winding temperature of the DC motor. The present invention can quickly provide thermal protection for a DC motor and provide a highly reliable elevator apparatus.

[Brief description of the drawings]

FIG. 1 is a configuration diagram of a DC elevator control device according to a first embodiment of the present invention.

FIG. 2 is a block diagram showing a control circuit of the DC elevator control device according to the present invention.

FIG. 3 is a flowchart showing the operation of the DC elevator control device according to the present invention.

[Explanation of symbols]

1 three-phase AC power supply, 2 converters, 3 inverters,
4 DC motor, 5 speed detection circuit, 6 Current detection circuit,
7 sheave, 8 basket, 9 counterweight, 10 smoothing capacitor, 11 elevator control section, 12 pattern generation circuit, 13 control circuit, 14 PWM circuit, 15 base drive circuit, 21 speed control means, 22 torque control means,
23 voltage command generating means, 24 winding constant constant detecting means, 25 winding constant storing means, 26 winding constant detecting means, 27 winding temperature detecting means, 28 winding safety determining means, 29 starting limiting means, 30 reporting means , 31 notification means, 32 outside air temperature measurement means.

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 3F002 AA10 CA07 CA10 EA01 GA06 GB01 GB02 3F303 CB46 CB48 DB27 DC01 EA03 5H571 AA09 BB10 CC05 DD01 EE06 FF01 GG02 GG04 HA10 HC01 HD02 JJ28 KK08 LL01 LL22 LL29 MM34

Claims (10)

[Claims] 1. A DC motor for driving and controlling an elevator, temperature measuring means for constantly measuring the temperature of a winding of the DC motor during operation of the elevator, and the elevator using a temperature signal from the temperature measuring means. And a control circuit for controlling the operation of the elevator. 2. The control circuit according to claim 1, wherein the temperature of the winding section is classified into a plurality of temperature levels by a temperature signal from the temperature measuring means, and the operation of the elevator corresponding to each of the temperature levels is controlled. The elevator control device according to claim 1. 3. The elevator control device according to claim 1, further comprising a notification unit that receives a signal from the control circuit and notifies a passenger of an operation state of the elevator. 4. The elevator control apparatus according to claim 1, further comprising a notification unit that receives a signal from the control circuit and notifies an elevator manager or a management company of an operation state of the elevator. 5. An outside air temperature measuring means for measuring an outside air temperature of a DC motor, an initial winding constant detecting means for measuring a winding resistance of the DC motor during an initial operation when an elevator is started, and an initial winding constant. 2. The elevator control device according to claim 1, further comprising a winding constant storage unit that stores measurement value data of the outside air temperature measurement unit and a detection unit. 6. A control circuit comprising: a speed detecting means for detecting a rotation speed of the DC motor; a torque detecting means for detecting a torque of the DC motor; and a voltage command generating means for outputting a predetermined voltage to the DC motor. 2. The elevator control device according to claim 1, further comprising a winding constant detecting unit that constantly detects a winding resistance of the DC motor based on the following. 7. The elevator control according to claim 1, wherein the control circuit has a winding temperature detecting means for calculating a winding temperature of the DC motor by means of a winding constant storing means and a winding constant detecting means. apparatus. 8. The control circuit includes a winding safety determining unit that determines the thermal safety of the DC motor by comparing the winding temperature detected by the winding temperature detecting unit with a predetermined reference temperature. The elevator control device according to claim 1. 9. The control circuit according to claim 1, further comprising a start-up limiting unit that limits the start-up of the elevator using an output signal of the winding safety determination unit to ensure the safety of the winding of the DC motor. 2. The elevator control device according to claim 1. 10. The elevator control device according to claim 1, wherein the control circuit has control means for controlling the operation of the elevator using the latest winding resistance information from the winding constant detection means.