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Motor power supply system

A technology of power supply system and motor, applied in control system, AC motor control, electrical components, etc., to achieve the effect of low cost, solving instantaneous large current, and reducing cost

Active Publication Date: 2021-04-23
SHANGHAI MITSUBISHI ELEVATOR CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in this scheme, when there is a large enough instantaneous current passing through, the AC contactor must not be able to face such a situation

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0067] Such as figure 1 As shown, the motor power supply system includes a frequency converter 11, a battery on-off device 30 and a battery 23;

[0068] The frequency converter 11 is composed of an AC-DC-AC circuit, and is used to supply power to the motor 12 and drive the motor 12 to run;

[0069] The incoming line end of the frequency converter 11 is used to connect to the external network AC power supply, and the outgoing line end is connected to the motor 12;

[0070] The electric storage on-off device 30 includes a STO (Safe Torque Off) circuit 301, a drive module 302 and a bidirectional DC converter (DC-DC) 303;

[0071] In the STO circuit 301, its charge input terminal STO1 is connected to the positive DC side of the inverter 11, its discharge input terminal STO2 is connected to the negative terminal of the storage device 23 and the negative terminal of the bidirectional DC converter 303, and its discharge output terminal PWR_OUT_2 is connected to the The DC side of t...

Embodiment 2

[0084] Based on the motor power supply system of Implementation 1, the motor 12 is a traction motor for driving the elevator car to move up and down.

[0085] Preferably, the motor power supply system also includes a main contactor 10;

[0086] The main contactor 10 is arranged between the AC power supply of the external network and the input terminal of the frequency converter 11, and controls the switching of the AC power supply of the external network to the power supply circuit of the motor 12.

[0087] In the motor power supply system of Embodiment 2, when the elevator is running, the AC power from the external network is controlled by the main contactor 10 and sent to the main circuit of the elevator. After the AC-DC-AC change of the frequency converter, the motor is driven to rotate to drive the car for up or down. When the elevator car is fully loaded and descends, the weight of the car side is greater than that of the counterweight side. At this time, according to th...

Embodiment 3

[0089] Based on the implementation of a motor power supply system such as image 3 As shown, the frequency converter 11 includes a rectifier 111 and an inverter 112;

[0090] The input terminal of the rectifier 111 is connected to an external network AC power supply, and outputs a DC voltage to the input terminal of the inverter 112;

[0091] The inverter 112 inverts the DC voltage at its input terminal into an AC voltage to supply power to the motor 12 .

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PUM

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Abstract

The invention discloses a motor power supply system, which is characterized in that a frequency converter consists of an AC-DC-AC circuit and is used for supplying power to a motor; a charging input end of an STO circuit is connected with a DC side positive end of the frequency converter, a discharging input end of the same is connected with a negative end of a current condenser and a negative end of a bidirectional DC converter, a discharging output end of the same is connected with the DC side positive end of the frequency converter, a charging output end is connected with a charging side input positive end of the bidirectional DC converter, and a working power supply output end is used for providing working voltage for a driving module; the bidirectional DC converter adopts a bridge circuit, and an energy storage side output positive end of the bidirectional DC converter is connected with a positive end of the current condenser; the bidirectional DC converter is provided with a fault sampling signal output end; the fault sampling signal output end outputs a fault sampling signal to the driving module; and the driving module outputs a diagnosis signal to a control end of the STO circuit. According to the motor power supply system, the STO circuit is used for controlling the current on-off of the energy storage end current condenser and the motor side, the cost is low, and the problem of instantaneous large current can be solved.

Description

technical field [0001] The invention relates to elevator drive and control technology, in particular to a motor power supply system. Background technique [0002] With the continuous deepening of the urbanization process, more and more buildings have begun to rise in the city, and the architectural space of the city is continuously extending in the vertical direction, which has also resulted in the increasing use of vertical elevators. Although the vertical elevator provides great convenience for the vertical transportation of people in the building, it also consumes a lot of power. [0003] When the vertical elevator is running, the traction motor is in the state of regenerative power generation under the condition of heavy load downward, light load upward and deceleration. At this time, the elevator not only does not consume electric energy, but will convert part of the potential energy of the elevator system into electric energy and feed it back to the in the elevator sy...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02P27/08H02M1/34
CPCH02P27/085H02M1/34
Inventor 张宇航张磊梁佳杰
Owner SHANGHAI MITSUBISHI ELEVATOR CO LTD