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Asynchronous motor rotor time constant adjusting method

A technology of rotor time constant and adjustment method, applied in the control of generator, motor generator control, electronic commutation motor control, etc., can solve the problem of no torque test, etc., and achieve the effect of high efficiency and less time-consuming

Active Publication Date: 2016-08-24
中国船舶重工集团公司第七一二研究所
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

And in some practical applications, there may not be a torque tester or similar torque test equipment

Method used

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  • Asynchronous motor rotor time constant adjusting method
  • Asynchronous motor rotor time constant adjusting method
  • Asynchronous motor rotor time constant adjusting method

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Embodiment Construction

[0024] The present invention will be described in further detail below in conjunction with the accompanying drawings.

[0025] In some practical applications, there may be no torque test or similar torque test equipment. In this case, it can be considered to roughly judge whether the rotor time constant is accurate by observing the modulation coefficient of the frequency converter when the motor is running, and Give the adjustment method.

[0026] The present invention is mainly applicable to the occasions where there is no torque tester or torque test equipment in the vector control of asynchronous motors, and the deviation of the rotor time constant is relatively large, and the accuracy of the rotor time constant can be roughly judged by observing the modulation coefficient of the frequency converter when the motor is running , adjust the rotor time constant according to the rotor time constant offset coefficient curve.

[0027] figure 1 Shown is the equivalent circuit dia...

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Abstract

The invention discloses an asynchronous motor rotor time constant adjusting method. The asynchronous motor rotor time constant adjusting method comprises the steps: judging whether the rated field current is accurate; commanding the motor to operate with high speed under zero load, recording and extracting several practical modulation coefficients for a frequency converter in different rotating speed stages, obtaining the due theoretical modulation coefficient in the normal situation through calculation, comparing the values of the two modulation coefficients and adjusting the excitation current value set by the system until the two modulation coefficients for several different speed points become approximate; and on the basis of determining that the excitation current value set by the system is approximate to the rated excitation current value, commanding the motor to run with moderate load or heavy load in the high speed stage, recording and extracting several practical modulation coefficients for the frequency converter in different rotating speed stages, calculating the modulation coefficients under the corresponding rotating speed at the same time, and comparing the values of the two coefficients at several different speed points. The asynchronous motor rotor time constant adjusting method is high in efficiency and low in consumed time, and can be quickly mastered and applied to field debugging to enable the motor rotor time constant to be approximate to a true value so as to guarantee the motor to work in the optimal state.

Description

technical field [0001] The invention belongs to the field of indirect vector control of asynchronous motors with speed sensors, and specifically relates to a rotor time constant adjustment method, which is mainly applicable to occasions where torque testers or torque test equipment are not provided in the vector control of asynchronous motors, and the deviation of the rotor time constant is relatively large . Background technique [0002] AC asynchronous motors have the advantages of simple structure, convenient manufacture, low price, sturdy and durable, small inertia, reliable operation, little maintenance and can be used in harsh environments, etc., and have been widely used in industrial and agricultural production. The method of AC asynchronous motor speed regulation is also developing continuously. After the 1970s, a new control idea - vector control has been promoted and popularized, and is widely used in various industries. Vector control is based on the theory of c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02P21/16
Inventor 李鹏姬凯杨进京刘忠举赵影
Owner 中国船舶重工集团公司第七一二研究所
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