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Control method and method for switching power grid driving of escalator into variable frequency driving

An escalator and variable frequency drive technology, applied in the field of variable frequency control, can solve the problems of low reliability, low efficiency, and difficult to achieve, and achieve the effects of stable current, smooth escalator transition, and no current flow

Active Publication Date: 2016-10-12
GUANGDONG UNIV OF TECH
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Problems solved by technology

[0005] The purpose of the present invention is to provide a control method and device for switching an escalator from power grid drive to variable frequency drive. The purpose is to solve the problems of low efficiency, difficult , quickly track the current motor speed, and realize smooth switching to variable frequency drive

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  • Control method and method for switching power grid driving of escalator into variable frequency driving

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[0047] In order to enable those skilled in the art to better understand the solution of the present invention, the present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments. Apparently, the described embodiments are only some of the embodiments of the present invention, but not all of them. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

[0048] The flow chart of a specific embodiment of the control method for switching the escalator from the grid drive to the variable frequency drive provided by the present invention is as follows figure 1As shown, the method includes:

[0049] Step S101: Disconnect the drive motor of the escalator from the grid;

[0050] Step S102: After the disconnection time reaches the preset first time, sample the two-p...

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Abstract

The invention discloses a control method and a device for switching power grid driving of an escalator into variable frequency driving. The method comprises the following steps: disconnecting a driving motor of the escalator with a power grid; sampling the two-phase current of a motor stator after disconnection time reaches a preset first time; computing the output voltage target value of an inverter unit through a following logic algorithm, and determining the frequency target value of the inverter unit; gradually transiting the output voltage of the inverter unit to the output voltage target value according to the output voltage target value and the frequency target value, so as to drive the motor and accomplish the switching of the escalator from power grid driving into variable frequency driving. According to the method, when switching is performed, the driving motor of the escalator is actively disconnected from the power grid, the current rotate speed of the motor is rapidly tracked, the switching from power grid driving into variable frequency driving is accomplished, the method is simple and practical, during switching, the current of the motor stator is stable, overcurrent cannot occur, the escalator is smooth in transition, and the method has good engineering practice value.

Description

technical field [0001] The invention relates to the technical field of frequency conversion control, in particular to a control method and device for switching an escalator from a power grid drive to a frequency conversion drive. Background technique [0002] Escalators are widely used in hotels, shopping malls, subways, railway stations and other places. In practical application, in order to meet the needs of energy saving and safety, the escalator switches continuously between the grid drive and the variable frequency drive. When the grid drive switches to the variable frequency drive, the inverter unit will generally stop output immediately. It is in the state of free rotation within a certain period of time. Since the current motor speed is unknown, a direct start will cause excessive inrush current due to a large slip and cause start-up failure. Excessive inrush current will also endanger the stability of the motor and peripheral equipment. Therefore, switching from g...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B66B25/00
CPCB66B25/003
Inventor 张淼祝大芬黎庆发唐雄民
Owner GUANGDONG UNIV OF TECH
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