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A Method of Measuring the Equivalent Rotor Copper Loss of Squirrel-cage Asynchronous Motor

A technology for the copper loss of asynchronous motors and rotors, which can be used in the measurement of electricity, measurement of electrical variables, and motor-generator testing, etc.

Active Publication Date: 2020-10-27
XI AN JIAOTONG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, as the rated power of the motor increases, the fundamental frequency stray loss also increases, and the calculation of electromagnetic power can no longer ignore the influence of the fundamental frequency stray loss. A new method that can consider the fundamental frequency stray loss is urgently needed Determination method

Method used

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  • A Method of Measuring the Equivalent Rotor Copper Loss of Squirrel-cage Asynchronous Motor

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Embodiment Construction

[0022] The present invention will be described in further detail below in conjunction with the accompanying drawings and specific embodiments.

[0023] Please refer to figure 1 , a method for measuring the equivalent rotor copper loss of a squirrel-cage asynchronous motor of the present invention comprises the following steps:

[0024] Step 1. Block the rotor of the squirrel-cage asynchronous motor to be tested. The measures to block the rotor generally include: a) clamp the shaft extension with a special splint, b) clamp the shaft extension with a special clamp, c) use a Hardwood boards support shaft extensions, etc.

[0025] Step 2: Apply a three-phase symmetrical low voltage U with a slip frequency to the stator winding of the squirrel-cage asynchronous motor 1 ;Depend on figure 1 The equivalent circuit of the motor locked-rotor test shown, the calculation formula is Estimated value U can be obtained 1 , U 1 yes The magnitude of ; where: The phase voltage of the ...

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Abstract

The invention discloses a method for measuring equivalent rotation copper consumption of a squirrel cage-type asynchronous motor. The method comprises the steps of blocking a squirrel cage-type asynchronous motor rotor, applying a three-phase symmetric voltage of a stator winding slip frequency so that a locked-rotor current is same as a stator current under a load state, and recording an input power, a stator voltage and a stator current. The rotor copper consumption of a locked-rotor test is equal to the input power subtracted from stator copper consumption, iron consumption and stray loss,and the result is equivalent rotor copper consumption corresponding to the same rotor frequency and the rotor current of the motor under the load state. According to the method for measuring the equivalent rotation copper consumption of the squirrel cage-type asynchronous motor, the rotor copper consumption of the squirrel cage-type asynchronous motor under the load running working condition is measured by an equivalent idea.

Description

technical field [0001] The invention belongs to the technical field of loss measurement of asynchronous motors, in particular to a method for measuring the equivalent rotor copper loss of a squirrel-cage asynchronous motor. Background technique [0002] The loss measurement method directly affects the evaluation of the motor efficiency index and the temperature field analysis. The traditional method is used to measure the rotor copper loss in the national standard GB / T 1032-2012-10.3, that is, the rotor copper loss is the slip multiplied by the electromagnetic power, and the electromagnetic The power is equal to the stator input power minus the stator copper loss and iron loss. From the analysis of the motor power flow, it can be seen that the calculation of the above electromagnetic power ignores the fundamental frequency stray loss, that is, the additional stator copper loss caused by the skin effect and the eddy current loss caused by the end cover magnetic flux leakage. ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R27/26G01R31/34
CPCG01R27/2688G01R31/346
Inventor 刘新正李浩杰陈文李志恒李鹏王娟
Owner XI AN JIAOTONG UNIV
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