Prediction method of reliability of operation temperature rise of large and medium-sized motors
A technology of operating temperature and prediction method, which is applied in the direction of motor control, electrical components, electrical digital data processing, etc., and can solve problems such as uncertain temperature rise of motors
Active Publication Date: 2018-07-27
YANGZHOU UNIV
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[0003] The purpose of the present invention is to propose a method for predicting the reliability of the temperature rise of large and medium-sized motors in response to the above-mentioned problem of uncertain temperature rise caused by the uncertainty of various temperature-rise influencing factors—that is, the temperature of the stator winding of the motor does not exceed the maximum allowable temperature. temperature reliability method
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[0109] Below in conjunction with accompanying drawing and embodiment the present invention will be further described:
[0110] The motor used for the main water pump of a pumping station is a synchronous motor with a rated voltage of 6000V, a rated current of 180A, a number of phases of 3, an insulation class of F, a core mass of 3.693t, a core height of 370mm, and the number of ventilation channels 6, the height of the ventilation groove is 10mm, the inner diameter of the iron core is 2290mm, the outer diameter of the iron core is 2600mm, the height of the ventilation groove is 10mm, the width of the groove is 18mm, the length of the iron core is 155mm, the number of ventilation grooves is 216, and the stator is 75°C The phase resistance is 0.2416Ω, the exciting current under the rated load is 177A, and the winding resistance is 0.6398Ω.
[0111] In step A, the main factors affecting the temperature rise of the motor winding are determined:
[0112] When the ambient temperat...
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The invention discloses a prediction method of reliability of operation temperature rise of large and medium-sized motors and belongs to the technical field of reliability and durability of mechanicaland electrical power equipment. The prediction method comprises steps as follows: determination of main influence factors of temperature rise of a motor winding; calculation of heat generation amountand temperature rise of a motor under the influence of the determined factors; determination of random numerical characteristics of main influence factors of temperature rise of the motor winding; determination of the possible minimum value and the maximum value of operation temperature of the motor winding at different environment temperatures; calculation of the reliability that the operation temperature of the motor winding is smaller than the given temperature at different environment temperatures; calculation and determination of the reliability of operation temperature rise of the motorwinding. The probability that the operation temperature of the motor is lower than the highest allowable temperature under the influence of multiple uncertain factors can be accurately predicted, theprediction method is more scientific, the prediction result is more reasonable, a scientific basis is provided for design, selection and application of the motor and a ventilation cooling system thereof, the operation safety reliability of the motor is improved, and the prediction method has great theoretical academic value and engineering application significance.
Description
technical field [0001] The invention belongs to the technical field of reliability and durability of electromechanical power equipment, and relates to a method for predicting the reliability of operating temperature rise of large and medium-sized motors. A method for predicting the reliability of motor operating temperature rise due to uncertainties in factors such as ventilation. Background technique [0002] During the operation of the motor, a large amount of heat will be generated due to the existence of various losses, which will cause the temperature of each part of the motor to rise. If the heat cannot be discharged in time, the temperature of the motor will continue to rise. Corresponding to a motor with a certain insulation level, if the maximum allowable temperature is exceeded, the insulation of the motor will accelerate aging, or even break down directly, causing accidents and losses. The earth affects the safe and reliable operation of the motor. Therefore, th...
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IPC IPC(8): G06F17/50
CPCG06F30/17G06F2119/08H02P29/64
Inventor 仇宝云许梦凡陆霞郭嫱汤黎明薛成龙张偲刘地赵方玲
Owner YANGZHOU UNIV
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