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elevator

A technology of elevator and current command, applied in the direction of electrical components, control generator, motor generator control, etc., can solve problems such as difficult synchronous motor control, inability to obtain magnetic pole position signals, etc.

Active Publication Date: 2021-07-09
HITACHI LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In an elevator using a synchronous motor, if the sensor used to detect the magnetic pole position fails, the magnetic pole position signal cannot be obtained and it is difficult to control the synchronous motor

Method used

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Embodiment Construction

[0028] Hereinafter, embodiments of the present invention will be described with reference to the drawings. In each figure, members with the same reference numerals denote the same constituent elements or constituent elements having similar functions.

[0029] figure 1 It is an overall configuration diagram of an elevator showing one embodiment of the present invention.

[0030] In the present embodiment, the movement of the car 104 is controlled by controlling the drive of the synchronous motor 103 by a drive control device including the power converter 101 and the controller 100 (control device). The controller 100 includes a current command generating unit 1 , a magnetic pole position command generating unit 2 , a magnetic pole phase difference adding unit 3 , and an initial magnetic pole position estimating unit 4 . These functions will be described later. In addition, a load cell 7 is installed on the car 104 , and the load of the car 104 is detected by the load cell 7 ...

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Abstract

The elevator of the present invention includes a synchronous motor for driving the car, a brake, and a control device for controlling the synchronous motor, wherein the control device includes: a magnetic pole position command generation unit for generating a magnetic pole position command; a magnetic pole position estimating section; a magnetic pole phase difference adding section which calculates a phase difference between the initial magnetic pole position and the magnetic pole position of the stator of the synchronous motor in the case where the load torque at the initial magnetic pole position and the motor torque are in balance, by combining it with The initial magnetic pole positions are added to calculate the corrected initial magnetic pole position, and the corrected initial magnetic pole position is output to the magnetic pole position command generation part; and the brake control part, when the brake control part releases the brake, the magnetic pole position command generation part will correct the The initial magnetic pole position is set as the magnetic pole position command, after the brake is released, the car is started.

Description

technical field [0001] The invention relates to an elevator driven by a synchronous motor. Background technique [0002] In order to drive an elevator, a synchronous motor using a permanent magnet can be used from the viewpoint of miniaturization and high efficiency. In order to control such a synchronous motor, it is necessary to detect the magnetic pole position of the rotor. As a sensor for detecting the magnetic pole position, for example, an optical or magnetic rotary encoder, a resolver, or the like can be used. [0003] In an elevator using a synchronous motor, if a sensor for detecting a magnetic pole position fails, a magnetic pole position signal cannot be obtained, making it difficult to control the synchronous motor. In particular, in the case of controlling an elevator using a counterweight, if the synchronous motor cannot output a torque equivalent to the difference between the weight of the counterweight and the weight of the car, the car will be driven by t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B66B1/30B66B5/02H02P21/32
CPCB66B1/30B66B5/02H02P21/32
Inventor 照沼智明高山直树井上真辅大沼直人
Owner HITACHI LTD