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Elevator control device

A control device, elevator technology, applied in the direction of circuit devices, emergency protection circuit devices, emergency protection devices with automatic disconnection, etc.

Active Publication Date: 2012-06-13
TOSHIBA ELEVATOR KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, in this patent document 1, the part that detects the phase loss abnormality of the "three-phase AC power supply" does not target the "three-phase AC motor".

Method used

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Experimental program
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no. 1 Embodiment approach

[0023] figure 1 It is a figure which shows the structure of the control apparatus of the elevator concerning 1st Embodiment of this invention.

[0024] In addition, DE1 to 3 in the figure represent subtractors, and AD1 to 2 represent adders. In addition, "SPC" is a speed control command, "WTC" is a load balance torque current command, and "ICHK" is a current check command. These commands are output from the traveling control unit 30 corresponding to the main control device.

[0025] In this device, a three-phase AC motor 1 is provided as a motor. In addition, each control device including an inverter 4 is provided as a motor drive unit of the three-phase AC motor 1 . The three-phase AC motor 1 has three-phase windings of U-phase, V-phase, and W-phase, and is rotated by sequentially exciting them. Also, in figure 1 In the example of , it shows the state where the phase U is lost.

[0026] A pulley 1 a is rotatably attached to the rotating shaft of the three-phase AC motor...

no. 2 Embodiment approach

[0078] Next, a second embodiment of the present invention will be described.

[0079] In the first embodiment described above, the current phase θ of the three-phase AC motor 1 is initially set to 0° at the time of phase loss confirmation. However, as described above, when a synchronous motor equipped with permanent magnets is used as the three-phase AC motor 1, torque may be generated in the permanent magnets depending on the phase of the current flowing at the time of phase loss confirmation.

[0080] Therefore, in the second embodiment, the current phase θ is selected according to the value of the rotation phase θ0 of the three-phase AC motor 1 to minimize the generation of torque.

[0081] Figure 8 It is a figure which shows the structure of the control apparatus of the elevator concerning 2nd Embodiment of this invention. Also, with respect to the above-mentioned first embodiment figure 1 The parts with the same structure are attached with the same symbols, and their ...

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PUM

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Abstract

The invention provide a controller of an elevator. The galvanoscope instruction 'ICHK' became effective, thereby each phase supply of the three-phase AC electric motor from the inverter can be used for the electric voltage flowing through the current for confirming the default phase. Each phase supply of the three-phase AC electric motor from the inverter can be used for the electric voltage flowing through the current for confirming the default phase. At this time, the current detector detects current value flowing over each phase, moreover compared with the set reference value for default phase judgment in advance. If the reference value is low, the default phase is judged to be happened, moreover the running of the lift car is forbidden immediately.

Description

technical field [0001] The present invention relates to a control device for an elevator equipped with a three-phase AC motor, and more particularly to a control device for an elevator that detects a phase loss abnormality of the three-phase AC motor. Background technique [0002] Generally, an elevator includes a three-phase AC motor as a drive source for the car. This three-phase AC motor has three-phase windings, and they are rotated by sequentially exciting them. However, if one of the three phases loses a phase due to some cause such as vibration, the rotation of the three-phase AC motor cannot be controlled at a predetermined speed. Therefore, the car will run at an abnormal speed, thereby being in a dangerous state. [0003] Therefore, usually, when an abnormal speed exceeding a predetermined value is detected while the car is running, it is determined that a phase loss has occurred in the three-phase AC motor, and the operation of the car is stopped urgently. Howe...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B66B5/02H02H3/253
Inventor 秋月博光嶋根一夫
Owner TOSHIBA ELEVATOR KK