JP2008168974A - Control device for man conveyor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To obtain a man conveyor driving a motor by preventing decline in operation efficiency and increase in an electric current flowing in the motor. <P>SOLUTION: This control device 50 for the man conveyor 1 for circulating a plurality of endlessly connected steps 7 by driving the motor 25 by AC voltage having frequency is provided with an inverter 23 for making the AC voltage and frequency variable; an electric current detection sensor 29 for generating an electric current detection signal by detecting an electric current of the motor 25; a motor control means for controlling a slide angle frequency of the motor 25 while decomposition into a magnetizing current and a torque current flowing in the motor 25 is performed by the inverter 23; a first determination part 83 for determining whether or not the electric current detection signal exceeds a reference electric current signal and generating an overload signal when the electric current detection signal exceeds the reference electric current signal; and a slide angle frequency calculating part 65 increasing the slide angle frequency based on generation of the overload signal. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

The present invention relates to a control device for a man conveyor.

A conventional man conveyor control device, as described in the following Patent Document 1, is a man conveyor that circulates and moves a plurality of steps connected endlessly by a driving device, depending on the state of passengers entering the man conveyor. Based on the detection means for detecting the current of the motor constituting the changing drive device and the detection result of the detection means, it is determined that the load of the drive device exceeds a predetermined value or the load exceeds the predetermined value. In some cases, there are those provided with operation control means for controlling the drive device to lower the operation speed.

According to the control device for the man conveyor, it is possible to realize speeding up, power saving, and equipment saving of the passenger conveyor without enlarging the equipment and the power equipment.
JP 2004-123348 A

However, in the control device for the man conveyor, when the load of the drive device exceeds a predetermined value or when it is determined that the load exceeds the predetermined value, the drive device is controlled to reduce the operation speed. Therefore, there was a problem that the driving efficiency was lowered.
On the other hand, in order to prevent the reduction of the operation efficiency, even if the boarding on the man conveyor increases, if an attempt is made to maintain the operation speed, the current flowing through the inverter that drives the motor increases and the semiconductor element constituting the inverter There was a problem of overloading.

The present invention has been made to solve the above-described problems. Even if the boarding on the man conveyor increases, the motor efficiency is prevented from decreasing and the current flowing through the motor is prevented from increasing. It is an object to prevent an overload of a semiconductor element that drives the semiconductor device.

A control device for a man conveyor according to a first aspect of the present invention is the control device for a man conveyor which drives a motor by an AC voltage having a frequency to circulate and move a plurality of steps connected endlessly. Motor driving means for making the frequency variable; current detecting means for detecting a current of the motor to generate a current detection signal; and the motor driving means are decomposed into a magnetizing current and a torque current flowing through the motor. Motor control means for controlling the slip angular frequency of the motor; and an overload signal for determining whether the current detection signal is larger than a reference current signal and determining that the current detection signal exceeds the reference current signal. First determining means to be generated;
Slip angular frequency calculating means for increasing the slip angular frequency based on the occurrence of the overload signal.

According to a second aspect of the present invention, there is provided a control device for a man conveyor that detects a temperature of a motor and generates a temperature detection signal, determines whether the temperature detection signal is larger than a reference temperature signal, and Second judging means for generating an abnormal temperature signal that the temperature detection signal exceeds the reference temperature signal, and the slip angular frequency calculating means restores the slip angular frequency based on the temperature abnormal signal. Is preferred.
Thereby, not only overload of the motor driving means but also overload of the motor can be prevented.

According to the present invention, even if the boarding on the man conveyor increases, the operation efficiency is prevented from being lowered, and the current flowing through the motor is prevented from increasing, so that the semiconductor element of the motor driving means for driving the motor is overloaded. Can be prevented.

Embodiment 1 FIG.
An embodiment of the present invention will be described with reference to FIGS. FIG. 1 is an overall configuration diagram of a man conveyor showing one embodiment of the present invention, and FIG. 2 is a block diagram of a motor and a control portion of the man conveyor shown in FIG.
In FIG. 1, a man conveyor 1 has a handrail 3, a deck board 5, and a large number of circulating steps 7, and includes a lower truss 8 and an upper truss 9 at the entrance. ing. In the man conveyor 1, a three-phase induction motor 25 as a driving source for driving the step 7 is driven and controlled, and a speed for controlling the speed of the motor 25, that is, a speed control of the motor 25 is controlled. 50 and an operation switch 50 s for operating / stopping the control device 50.

The drive unit of the motor 25 of the man conveyor 1 includes a converter 21 that rectifies the AC power source e to generate a DC voltage, and an inverter as a motor drive means that controls the motor 25 by converting the DC voltage into a variable voltage variable frequency. 23. The detection unit of the motor 25 detects a current flowing through the motor 25, generates a current detection signal and inputs the current detection signal to the control device 50, and detects the rotational position of the motor 25. An encoder 27 as position detecting means for generating a position detection signal and inputting it to the control device 50; a temperature sensor 25s for detecting the temperature of the rotor of the motor 25 and generating a temperature detection signal and inputting it to the control device 50; have.

In FIG. 2, the control device 50 operates when the operation switch 50 s is turned on, stops when the operation switch 50 s is turned off, and differentiates the position detection signal generated from the encoder 27 to obtain a speed detection signal, and a speed command signal. A subtractor 51 for obtaining a speed deviation signal ωe that is a deviation between ω * and the speed detection signal ωr, a speed control unit 53 for obtaining a current command signal from the speed deviation signal ωe, and an excitation current command i _d * from the current command signal. A slip angular frequency ωs obtained from an Id computation unit 55 to be obtained, an Iq computation unit 57 to obtain a torque current command i _q * from a current command signal, an excitation current command i _d *, a torque current command iq *, and a secondary time constant τ 2 of the motor. And a sliding angular frequency calculation unit 65 for calculating

Further, the control device 50 adds the speed detection signal ωr and the slip angular frequency ωs to obtain the primary angular frequency ω, an integrator 69 that integrates the primary angular frequency ω to obtain the rotational phase θ, A three-phase / two-phase converter 73 that converts a three-phase current detection signal of the motor 25 into a d- and q-axis two-phase current, and fixing / rotation to the current detection signals Id and Iq according to the rotation phase θ of the motor 25 A coordinate conversion unit 75 that performs coordinate conversion, and generates two-axis voltage commands V _d and V _q of d and q from the two-phase currents of the d and q axes, the excitation current command i _d *, and the torque current command iq *. The current control unit 59, the coordinate conversion unit 61 that performs rotation / fixed coordinate conversion from the two-axis voltage commands V _d and V _q and the rotation phase θ, and the voltage control signals V _u and V _{v based} on the coordinate converted voltage command. , V _w for obtaining a 2-phase / 3-phase converter 63.

The control device 50 determines whether or not the current detection signal is larger than the reference current signal, generates a overload signal that the current detection signal exceeds the reference current signal, and the temperature detection signal A second determination unit 85 that determines whether the temperature detection signal exceeds the reference temperature signal and generates a temperature abnormality signal indicating that the temperature detection signal exceeds the reference temperature signal, and the slip angle frequency calculation unit 65 includes an overload signal The slip angular frequency ωs is increased on the basis of the occurrence of the slip, and the slip angular frequency is restored based on the temperature abnormality signal.
Here, the reason why the slip angular frequency ωs is increased by the generation of the overload signal is that the torque generated by the motor 25 increases in proportion to the slip angular frequency ωs and the current flowing through the motor 25 hardly increases. However, if the slip angular frequency ωs is increased, the rotor loss of the motor 25 increases and the temperature of the rotor is increased. Therefore, the temperature of the rotor of the motor 25 is detected by the temperature sensor 25s, and the second determination unit 85 The slip angular frequency is restored to the original by the generation of the temperature abnormality signal from the.

The operation of the control device for the man conveyor configured as described above will be described with reference to FIGS. FIG. 3 is a flowchart showing the operation of the control device for the man conveyor according to FIG.
Now, the operation switch 50s is on, and the man conveyor 1 is operating at the rated speed. A speed command signal ω * is generated, the motor 25 rotates, the encoder 27 generates a position detection signal, and the speed detection unit 31 generates a speed detection signal ωr. The subtractor 51 obtains a speed deviation signal ωe that is a deviation between the speed command signal ω * and the speed detection signal ωr and inputs it to the speed control unit 53.

The speed control unit 53 generates a current command signal based on the speed deviation signal ωe, and sends the excitation current command i _d * and the torque current command iq * to the current control unit 59 via the Id calculation unit 55 and the Iq calculation unit 57, respectively. input. On the other hand, the slip angle frequency calculation unit 65 obtains the slip angle frequency ωs from the excitation current command i _d *, the torque current command iq * and the secondary time constant τ 2 of the motor, and the adder 67 calculates the slip angle frequency ωs and the speed detection signal. The primary angular frequency ω is obtained by adding ωr, and the rotational phase θ is input to the coordinate conversion unit 75 via the integrator 69.

The three-phase / two-phase conversion unit 73 converts the three-phase current detection signal of the motor 25 into the d- and q-axis two-phase currents, and the coordinate conversion unit 75 adjusts the current detection signal Id, in accordance with the rotational phase θ of the motor 25. The fixed / rotational coordinate conversion to Iq is performed and input to the current control unit 59, and the current control unit 59 inputs the voltage commands v _d and v _q to the coordinate conversion unit 61. The gauge conversion unit 61 performs rotation / fixed coordinate conversion from the biaxial voltage commands v _d and v _q and the rotation phase θ, and supplies the voltage control signals V _u and V to the inverter 23 via the two-phase / three-phase conversion unit 63. _v, by entering the V _w to rotate the motor 25.

When the passengers on the man conveyor 1 increase and the current flowing through the motor 25 increases, the first determination unit 83 determines whether the current detection signal is larger than the reference current signal, and the current detection signal is the reference current. If the signal is exceeded, an overload signal is generated (step S101), and the slip angular frequency calculation unit 65 increases the torque generated from the motor 25 by increasing the slip angular frequency ωs based on the occurrence of the overload signal. Then, the man conveyor 1 is operated while maintaining the rated speed (step S103). When the slip angle frequency ωs is increased and the motor 25 is operated for a long time, the temperature of the rotor of the motor 25 rises.

The second determination unit 85 determines whether or not the temperature detection signal is larger than the reference temperature signal. When the temperature detection signal exceeds the reference temperature signal, a temperature abnormality signal is generated (step S105), and the slip angle frequency calculation is performed. The unit 65 restores the slip angular frequency based on the temperature abnormality signal (step S107). If it is determined whether or not the operation switch 50s is pressed and the operation switch 50s is turned off (step S109), the operation is terminated.

According to the control device 50 of the man conveyor 1 according to the above embodiment, in the man conveyor control device 50 that circulates and moves a plurality of steps connected endlessly by driving the motor 25 with an alternating voltage having a frequency. The inverter 23 that makes the AC voltage and frequency variable, the current sensor 29 that detects the current of the motor 25 and generates a current detection signal, and the inverter 25 are decomposed into a magnetizing current and a torque current flowing through the motor 25. A motor control unit that controls the slip angle frequency of the motor 25, a first determination unit 83 that generates an overload signal that determines whether or not the current detection signal is larger than the reference current signal, and an overload A slip angular frequency calculating unit 65 that increases the slip angular frequency based on the generation of a signal is provided.

According to such a control device 50, even if the number of passengers entering the man conveyor 1 increases, the operating speed is prevented from being lowered, and the current flowing in the motor 25 is prevented from increasing and the semiconductor element of the inverter 23 that drives the motor 25 is driven. Can prevent overload.

According to the man conveyor control device 50 according to the above embodiment, the temperature sensor 25s that detects the temperature of the motor 25 and generates a temperature detection signal, and determines whether the temperature detection signal is larger than the reference temperature signal. It is preferable that the second determination unit 85 generates a temperature abnormality signal to exceed the slip angle frequency calculation unit 65, and the slip angle frequency calculation unit 65 restores the slip angle frequency based on the temperature abnormality signal. Thereby, not only the overload of the inverter 25 but also the overload of the motor 25 can be prevented.

  The present invention can be applied to a control device for a man conveyor.

1 is an overall configuration diagram of a man conveyor showing an embodiment of the present invention. It is a block diagram of the control part of the man conveyor shown in FIG. It is a flowchart which shows operation | movement of the control apparatus of the man conveyor by FIG.

Explanation of symbols

  1 man conveyor, 7 steps, 23 inverter, 25 motor, 25 s temperature sensor, 27 encoder, 29 current sensor, 50 control device, 65 slip angular frequency calculation unit, 83 first determination unit, 85 second determination unit.

Claims (2)

In a control device for a man conveyor that circulates and moves a plurality of steps connected endlessly by an AC voltage having a frequency,
Motor driving means for making the AC voltage and the frequency variable;
Current detection means for detecting a current of the motor and generating a current detection signal;
The motor driving means is decomposed into a magnetizing current and a torque current flowing in the motor, and a motor control means for controlling a slip angle frequency of the motor;
First determination means for determining whether the current detection signal is greater than a reference current signal, and generating an overload signal that the current detection signal exceeds the reference current signal;
Slip angular frequency calculating means for increasing the slip angular frequency based on the occurrence of the overload signal;
A control device for a man conveyor characterized by comprising: Temperature detecting means for detecting a temperature of the motor and generating a temperature detection signal;
A second determination means for determining whether or not the temperature detection signal is greater than a reference temperature signal, and generating a temperature abnormality signal that the temperature detection signal exceeds the reference temperature signal;
The slip angular frequency calculating means restores the slip angular frequency based on the temperature abnormality signal.
The control device for a man conveyor according to claim 1.

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