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Method for providing given frequency in motor starting phase

A motor start-up and stage technology, applied in the field of motor start-up to provide a given frequency, can solve problems such as grid impact, achieve smooth start, reduce start-up current, and avoid start-up overcurrent tripping

Inactive Publication Date: 2012-01-25
CHINA CNR LIMITED DALIAN ELECTRIC TRACTION R&D CENT
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The technical problem to be solved by the present invention is to provide a method for setting the starting frequency of the motor, which can solve the problem of impact on the power grid due to sudden acceleration changes during the frequency conversion starting process of the existing motor

Method used

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  • Method for providing given frequency in motor starting phase
  • Method for providing given frequency in motor starting phase
  • Method for providing given frequency in motor starting phase

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Embodiment Construction

[0026] In order to make the above objects, features and advantages of the present invention more comprehensible, the present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0027] refer to figure 2 , which shows the flow of an embodiment of the method for providing a given frequency during the motor startup phase of the present invention, which specifically includes the following steps:

[0028] Step 201: Divide the motor starting process into an initial phase, a linear acceleration phase and an end phase;

[0029] Step 202: In the initial stage, the provided given frequency increases from 0, and the acceleration of the given frequency gradually increases;

[0030] Step 203: In the linear acceleration phase, provide a given frequency with a constant acceleration;

[0031] Step 204: In the final stage, the acceleration at the given frequency gradually decreases, and when the target frequency of the...

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Abstract

The invention provides a method for providing given frequency in a motor starting phase. The method is characterized by at least comprising a beginning phase and an ending phase in the starting process of the motor; in the beginning phase, the given frequency is provided at continuously-increasing acceleration, the given frequency and the acceleration of the given frequency are zero at the beginning of the beginning phase; in the ending phase, the given frequency is provided at the continuously-decreased acceleration; and the given frequency is increased to target frequency and the acceleration of the given frequency is decreased to zero in the end of the ending phase. In the invention, the starting phase of the motor is divided into the beginning phase and the ending phase, the accelerations of the given frequency are zero when the beginning phase is started and the ending phase is ended, the problem that an electric fence generates the impact by using the traditional linear acceleration method due to the mutation of the acceleration can be solved, the smooth starting of the motor can be realized, the starting current can be reduced, the starting overcurrent tripping can be avoided and thereby the performance of the motor can be fully exerted.

Description

technical field [0001] The invention relates to the technical field of frequency converter frequency control, in particular to a method for providing a given frequency during the starting phase of a motor. Background technique [0002] The three-phase asynchronous motor has simple structure, easy maintenance, low environmental requirements, and has obvious advantages in energy saving and productivity improvement. It has been widely used in industrial and agricultural production, transportation, national defense and daily life. There are two starting methods for three-phase asynchronous motors: one is direct starting, that is, the motor is directly connected to the rated voltage to start; Several forms such as autotransformer starting. At present, the most widely used starting method is the frequency conversion method. [0003] The frequency conversion starting method is to gradually increase the given frequency during the starting process. The existing given method adopts ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02P1/30
Inventor 高宏洋韩红彬刘丽沈世博
Owner CHINA CNR LIMITED DALIAN ELECTRIC TRACTION R&D CENT
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