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A method for identifying static/rotating synchronous motor, related equipment and frequency converter

A technology for synchronous motors and equipment, which is applied in frequency converters to identify the static/rotating fields of synchronous motors, and can solve the problem of not being able to automatically identify whether the motor is stationary or rotating

Active Publication Date: 2021-03-23
维谛新能源有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The embodiment of the present invention provides a method for identifying the standstill / rotation of a synchronous motor, related equipment, and a frequency converter to solve the problem that the existing starting method for a synchronous motor cannot automatically identify whether the motor is stationary or rotating

Method used

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  • A method for identifying static/rotating synchronous motor, related equipment and frequency converter
  • A method for identifying static/rotating synchronous motor, related equipment and frequency converter
  • A method for identifying static/rotating synchronous motor, related equipment and frequency converter

Examples

Experimental program
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Effect test

Embodiment 1

[0042] Embodiment 1 of the present invention provides a method for identifying the standstill / rotation of a synchronous motor, which can be applied to start-up control of a synchronous motor by a frequency converter. Specifically, as figure 1 As shown, it is a flow chart of the steps of the method for identifying the standstill / rotation of a synchronous motor in Embodiment 1 of the present invention, and the method may include the following steps:

[0043] Step 101: Provide a set excitation current to the rotor of the synchronous motor.

[0044] Applying excitation current to the synchronous motor rotor will form the main magnetic flux of the rotor. If the rotor of the synchronous motor rotates, the stator winding of the synchronous motor can induce the three-phase fundamental wave electromotive force E due to the cutting of the main magnetic flux 0 =4.44·f N1 k N1 ·φ 0 , where f N1 is the rotational frequency of the synchronous motor rotor, k N1 is the fundamental wind...

example 1

[0074] Specifically, if the large voltage detection unit is firstly selected to detect the stator voltage, then the frequency converter may specifically include the following steps in implementing the method for identifying the standstill / rotation of the synchronous motor, as follows: figure 2 Shown:

[0075] S1: start;

[0076] S2: The inverter confirms that it has received the signal to start the synchronous motor;

[0077] S3: Control the excitation cabinet to apply the set excitation current to the rotor of the synchronous motor;

[0078] S4: Select the large voltage detection unit;

[0079] S5: Detect the stator voltage;

[0080] S6: Determine whether the detected stator voltage is greater than 500V; if yes, execute S7; if not, jump to S9;

[0081] S7: Calculate the frequency, amplitude and phase of the stator voltage according to the detected stator voltage;

[0082] S8: The frequency converter supplies voltage to the synchronous motor according to the calculated f...

example 2

[0091] Specifically, if the ultra-low voltage detection unit is firstly selected to detect the stator voltage, the inverter implements the method for identifying the standstill / rotation of the synchronous motor may specifically include the following steps, as image 3 Shown:

[0092] T1: start;

[0093] T2: The inverter confirms that it has received the signal to start the synchronous motor;

[0094] T3: Control the excitation cabinet to apply the set excitation current to the rotor of the synchronous motor;

[0095] T4: selected extremely low voltage detection unit;

[0096] T5: Detect stator voltage;

[0097] T6: Determine whether the detected stator voltage is less than 500V; if yes, execute T7; if not, skip to T11;

[0098] T7: According to the detected stator voltage, calculate the frequency, amplitude and phase of the stator voltage;

[0099] T8: Determine whether the synchronous motor is stationary, if yes, skip to T9; if not, skip to T10;

[0100] T9: start the s...

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Abstract

The invention relates to a method for identifying a stationary / rotating state of a synchronous motor, related equipment and a frequency converter. The method can be used for supplying a set excitationcurrent to a rotor of the synchronous motor; due to the arrangement of a detection unit with a large precision measurement range and a detection unit with a small precision measurement range and highmeasurement precision, the method can be used for measuring high stator voltages precisely, and identifying fast rotation of the synchronous motor; in particular, the method can be used for measuringa voltage value precisely for the extremely low stator voltage, thereby accurately identifying whether the synchronous motor rotates slowly or is stationary, and being capable of realizing automaticstarting of the synchronous motor without determining the state of the synchronous motor manually before starting.

Description

technical field [0001] The invention relates to the technical field of electric motors, in particular to a method for identifying the static / rotation of a synchronous motor, related equipment and a frequency converter. Background technique [0002] Motors are widely used in metallurgy, petrochemical, electric power and other industries. The moment of inertia of the motor is relatively large. When the frequency converter used to control the motor is stopped or the fault is reset, the motor is often still rotating at high speed; if the restart must wait for the motor to come to a standstill, it will take a long time, so the so-called "Flying start" or "speed tracking start" method to realize the rotation start of the motor. It can be seen that the starting of the motor needs to be determined according to the current running state of the motor, whether to use a static start or a rotating start. [0003] The existing technology is relatively mature for the starting method of a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R31/34
Inventor 孙建强王海军胡志远
Owner 维谛新能源有限公司
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