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Load commutation inverter drive electrically excited synchronous motor rapid parking method

A technology of synchronous motor and electric excitation, applied in the direction of the stopping device, etc., to achieve the effect of fast stopping, short stopping time, and short stopping time

Active Publication Date: 2018-06-29
兰天驰
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method does not require additional floor space, and the disadvantage is that it can only be used at lower motor speeds

Method used

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  • Load commutation inverter drive electrically excited synchronous motor rapid parking method
  • Load commutation inverter drive electrically excited synchronous motor rapid parking method
  • Load commutation inverter drive electrically excited synchronous motor rapid parking method

Examples

Experimental program
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Effect test

specific Embodiment approach 1

[0020] The fast stopping method of the electric excitation synchronous motor driven by the load commutation inverter in this embodiment, the fast stopping method belongs to the electric braking method, and the fast stopping method includes when the motor speed is high and when the motor speed is low The fast parking methods of these two states are:

[0021] When the motor speed is high, use the LCI starting device, adopt the method of feedback braking, and feed back the kinetic energy of the motor to the grid to make the motor stop quickly; the full name of LCI is load commutation inverter;

[0022] When the motor speed is low, the method of energy consumption braking is adopted to consume energy in the motor winding, so that the motor stops quickly.

specific Embodiment approach 2

[0023] The difference from Embodiment 1 is that the fast stopping method of the electric excitation synchronous motor driven by the load commutation inverter in this embodiment, when the motor speed is high, the LCI starting device is used and the feedback braking method is used to stop the motor The method of feeding the kinetic energy of the kinetic energy back into the power grid makes the process of stopping the motor quickly. In the case of a high motor speed, the motor speed is relatively high after the excitation current of the motor with a high speed and a medium speed is increased, and the speed obtained by increasing the motor terminal voltage is relatively low. high,

[0024] First, when booting the device with LCI:

[0025] Then the LCI drive device works in the electric running state, and the directions of the voltages and currents are as follows: image 3 Shown: the rectifier works in the "rectification state" (firing angle αd =2.34U 2 cosα, DC bus current Su...

specific Embodiment approach 3

[0030] The difference from Embodiment 1 or Embodiment 2 is that the fast stopping method of the load commutation inverter driving the electric excitation synchronous motor in this embodiment adopts the energy-consumption braking method when the motor speed is low, and the Energy is consumed in the motor windings, and the process of making the motor stop quickly is that when the motor is at a low-to-medium speed, the energy consumption braking method is used to stop the motor quickly. In order to avoid the instantaneous short-circuit current being too large when the three-phase winding is short-circuited, first De-excitation, so that the motor terminal voltage drops to 0; then gradually build up the excitation, closed-loop adjustment of the short-circuit current, adjust the braking torque, so that the motor stops quickly.

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Abstract

The present invention provides a load commutation inverter drive electrically excited synchronous motor rapid parking method. When a current common large-power synchronous motor braking method employsan energy consumption braking method, energy is consumed on an external resistor, the volume of the external power resistor is large, and the occupation area is large. When a motor rotating speed ishigh, the method employs a LCI starting device and a method of braking feedback is employed to perform feedback of the kinetic energy of the motor to a power grid to rapidly stop the motor; and when the motor rotating speed is low, the energy braking method is employed to consume the energy in a motor winding to rapidly stop the motor. The method is shorter in required time for completing parking,and is especially suitable for the electrical dragging occasions requiring frequent starting and stopping.

Description

Technical field: [0001] The invention relates to a fast parking method for an electric excitation synchronous motor driven by a load commutation inverter. Background technique: [0002] The load commutation inverter (Load Communicated Inverter, referred to as LCI) is a synchronous motor starting device. The phase-controlled rectifier bridge composed of thyristors rectifies the input AC into DC and provides a variable DC voltage. Smoothing reactor L on the DC bus m Play the role of filtering and current limiting, and provide a relatively smooth DC current for the output current source inverter. The output inverter realizes natural commutation through the back electromotive force (BEF) of the synchronous motor, so as to achieve the effect of variable frequency starting. The block diagram of a typical LCI drive synchronous motor control system is as follows: figure 1 The basic structure diagram of the LCI driven electric excitation synchronous motor soft starter is shown in ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02P6/24
CPCH02P6/24
Inventor 兰天驰
Owner 兰天驰
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