JP2005104650A - Elevator door opening/closing device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To solve problems wherein, when an elevator door is opened/closed at low cost by a motor of a small rated power, the force to press the door in the closing direction is required so as to prevent the door from being opened though there is no problem in opening/closing the door, and while, to realize it, the motor is locked by the technology such as servo lock, or a brake is provided on the motor, the configuration and the control have been complicated and the cost has been high. <P>SOLUTION: To prevent a door from being opened, the opening position of the door is sensed by using a signal of a magnetic pole position sensor which has been originally provided in a DC brushless motor, the current runs in the motor to generate the torque in the door closing direction. In this method, a false door-pressing force can be obtained in a very effective manner by a simple circuit at low cost. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

The present invention relates to an elevator door opening / closing device using a DC brushless motor, which is related to an improvement in a control system in a door closing state during door opening / closing.

In order to keep the door closed when the door is closed, an elevator door opening and closing device has been used to prevent the motor from rotating in the opening direction by providing a brake or using a control technology such as servo lock. Need to put. In addition, in order to close the door against the force of opening the door by an external external pressure or an external external pressure, a force for pressing the door in the closing direction is required.
JP 2002-066862 A

  In order to hold the door when the door is closed, which is a conventional technology, the elevator door opening and closing device that holds the motor so that it does not rotate in the opening direction by using a brake or control technology such as servo lock There is a disadvantage that the number of parts increases and the cost becomes high. Further, it is necessary to use a motor having a large rated output in order to hold the door even if a short brake is used for braking by short-circuiting the winding terminals of the motor.

The need for technical solutions is that ordinary elevator doors are very light and are made with low friction, and motors with a low rated output are only needed to open and close the doors. It can be driven sufficiently. However, when the door is closed, it is necessary to keep the door closed against the force of opening the door by human or external external pressure. Become.
Therefore, in order to perform elevator door control using an inexpensive DC brushless motor for the purpose of opening and closing a general door, and to obtain sufficient resistance when the door is closed, a motor with a large rated output must be used. In addition, the motor needs to be energized in normal times, power consumption is large, and the configuration itself is expensive.

Conventionally, a control technology called servo lock has been used as an improvement measure.
However, this technology called servo lock is a technology that always feeds back the position signal of the motor and generates a rotational force in the opposite direction to the motor so that the motor is stopped. In order to realize this control, a position signal with relatively high resolution is required, and a position detection element such as an encoder is required. Due to this configuration, there is a drawback that the door opening and closing device itself is expensive.
The control method of the elevator door opening / closing device this time needs to be realized at low cost, and can be made inexpensive by diverting the magnetic pole position sensor that the DC brushless motor has in advance to obtain the excitation signal.

  The problem to be solved by the present invention is a method for obtaining a force for pressing the door in the closing direction when the door is closed with a motor having a relatively small rated output. Moreover, this function is realized with an inexpensive configuration.

In order to obtain a high torque when a door is closed at low cost by using a DC brushless motor, the present invention uses a magnetic pole position sensor for excitation switching that is originally provided in the DC brushless motor.
When the door is normally closed, the door is pressed in the door closing direction with a torque that is small enough not to open the door, and the signal output from the motor position detection element when the door is about to be opened artificially is counted. Then, it detects that the door has been opened.
At that time, by passing an electric current so that a torque greater than the rotational force of the motor is generated and moving the door in the door closing direction, the same action as holding the door in the closing direction by a pseudo force is achieved. Let

  In the elevator door control device of the present invention, the door control can be realized with a motor having a relatively small rated output, and therefore, by using the magnetic pole position sensor for excitation switching originally provided in the DC brushless motor, it is inexpensive. Door opening and closing device.

  In elevator door opening / closing control, it is particularly effective when you want to move a relatively light door at low cost. In that configuration, a DC brushless motor is preferably used as the motor. This is because a DC brushless motor generally includes a magnetic pole position sensor for switching excitation, and this signal can be used.

An elevator door opening / closing device is an important issue regarding a door opening / closing device regulated by law or the like, which has a pressing force against the force of artificially opening when the door is closed.
When an attempt is made to open the door with an external force artificially when the door is closed, an opening operation caused by the external force is detected, and a force for closing the door is generated against the force. When no external force is applied, the door is lightly pressed in the door closing direction. (In this state, the current flowing through the motor can be very small.)

  At this time, if the door is likely to be opened artificially, the signal of the magnetic pole position sensor of the motor is input to the microcomputer, and this signal is counted by the microcomputer.

  When a value set in advance in the microcomputer, for example, the number of signals actually input in 10 counts, the value of the current supplied to the motor is increased.

  When the current is increased, the motor torque is increased, and the reverse magnetic pole position sensor output reaches the set value, the motor current value is returned to the original small value after a certain period of time.

  In the configuration of the door opening and closing device according to the present invention, the door used for the partitioning or the like is used for opening and closing a door that is light in weight and does not need to respond at high speed, and that opens and closes a door that is heavy and requires high speed opening and closing. When a brushless motor is used and it is intended to be realized at low cost, any door can be applied.

(Example 1) The basic composition of a door opening and closing device is shown. (Example 2) An example of a DC brushless motor and an open / close control circuit is shown.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Motor controller 2 DC brushless motor 3 Drive side gear box 4 Door 5 Rubber belt 6 Driven side pulley 7 DC brushless motor 8 Magnetic pole position sensor 9 Power element for excitation switching 10 Energized phase switching distribution circuit 11 Microcomputer

Claims (2)

In an elevator door opening and closing device using a DC brushless motor, when holding the door so that it cannot be opened when the door is closed, the door is normally pushed with a low torque in the door closing direction and the door is likely to be opened. An elevator door opening and closing device characterized by detecting this and generating a high torque. The elevator door opening and closing device according to claim 1, wherein the door is likely to be opened using a signal detected via a magnetic pole position sensor built in the DC brushless motor. An elevator door opening and closing device characterized in that a high torque is generated upon detecting that