A method for estimating electromechanical time constant of electric motor
A time constant and electromechanical technology, which is applied in the direction of motor generator testing, measuring electricity, measuring electrical variables, etc., can solve the problems of large measurement error and large noise of current data, and achieve the effect of simple estimation and simple operation
Active Publication Date: 2022-04-12
BEIJING AUTOMATION CONTROL EQUIP INST
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This method relies on high-precision current testing equipment, and the measured current data is often noisy, especially for small motors, the measurement error is large
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[0016] A method for estimating the electromechanical time constant of a motor, comprising the steps of:
[0017] 1) Test and record, obtain the corner and the required time, and repeat it many times;
[0018] 2) Analysis and simplification, and establishment of relational expressions simultaneously;
[0019] 3) Solve and calculate, solve the motor start-up process time;
[0020] 4) Calculate the electrical time constant τ according to the empirical formula.
[0021] In the step 1), apply the rated voltage to the motor armature for a period of time, obtain the motor rotation angle and time through the electromagnetic dotting timer, repeat the test for many times, and record ψ 总1 、ψ 总2 、ψ 总3 、ψ 总4 , t 总1 , t 总2 , t 总3 , t 总4 .
[0022] Said step 2), the motor motion process can be divided into start-up process, steady-state process and braking process, assuming that the angle ψ of each motor start-up process 启动 and time t 启动 , the angle ψ of the braking process 制动 a...
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The invention belongs to the field of motor characteristic testing, and in particular relates to a method for estimating the electromechanical time constant of a motor. It includes: Step 1: Test and record, apply the rated voltage to the motor armature, obtain the motor rotation angle and time through the electromagnetic dot timer, and record four times in total; Step 2: Establish a relational expression; Step 3: Solve and calculate, Solve for t with variance as the optimal objective 启动 , Step 4: Calculate the electrical time constant τ, according to the formula τ=0.7t 启动 , to get the electromechanical time constant. The beneficial effect of the present invention is: the electromechanical time constant of the motor is estimated through the motor rotation angle and time, no high-precision current testing equipment is needed, no need to record the movement process of the motor, the operation is simple, and the simple estimation of the electromechanical time constant of the motor has good guiding significance.
Description
technical field [0001] The invention belongs to the field of motor characteristic testing, and in particular relates to a method for estimating the electromechanical time constant of a motor. Background technique [0002] The electromechanical time constant of the motor is an important parameter index of the motor. Before assembly and use, it is often necessary to test the electromechanical time constant of the motor separately to ensure that the system index requirements are met. [0003] Usually, the electromechanical time constant test method is the current method, that is, after the rated voltage is applied to the motor armature, the test current rises from 0 to the highest value and then drops to the current value I T time required. This method relies on high-precision current testing equipment, and the measured current data is often noisy, especially for small and small motors, and the measurement error is relatively large. Contents of the invention [0004] The p...
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IPC IPC(8): G01R31/34
CPCG01R31/343
Inventor 高炳东庞喜浪熊官送关平王帅卢扬何平
Owner BEIJING AUTOMATION CONTROL EQUIP INST