Identification Method of Electrical Performance Parameters of Three-phase Asynchronous Motor
A technology of electrical performance and identification method, applied in the direction of measuring resistance/reactance/impedance, measuring electrical variables, measuring devices, etc., to achieve the effect of rapid acquisition and simple operation
Active Publication Date: 2018-04-10
昆明电器科学研究所
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Problems solved by technology
[0003] Using a three-phase symmetrical AC voltage power supply capable of outputting DC voltage, adjustable frequency and adjustable amplitude to realize the identification method of electrical performance parameters of a three-phase asynchronous motor has not been reported before the invention is proposed.
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[0028] Take a three-phase four-pole 380V, 5.5kW asynchronous motor as an example. The stator of the asynchronous motor in this example is star-connected, and a MEGMEET constant voltage frequency frequency converter is used as an adjustable power supply to simultaneously measure voltage, current and phase angle.
[0029] Apply two DC voltages to the three-phase stator windings of the motor, and measure the current at the same time. Apply a voltage of 10V, and the measured current is 1.12A (A-B, A-C, B-C average), which is substituted into the formula: (Star connection method), the calculated stator resistance R 1 is 4.47Ω.
[0030] Add three-phase symmetrical alternating current to the motor from 2V to 20V at intervals of 1V, so that the motor can basically run stably at the synchronous speed of the power supply, and draw image 3 The schematic diagram of the calculation of iron loss is shown, and p is calculated by extrapolation method Ω is 21W, select a set of test data wi...
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The invention discloses a method for identifying electrical performance parameters of a three-phase asynchronous motor. Firstly, the motor stator resistance R1 is calculated by applying two DC voltages to the three-phase stator windings of the motor and measuring the current at the same time; secondly, applying a three-phase symmetrical sinusoidal AC voltage to the motor, and measuring the current when the motor is running at the synchronous speed of the power supply. Calculate the power, calculate the complex impedance, and thus calculate the motor excitation resistance Rm and reactance X1+Xm; finally, apply a three-phase symmetrical sinusoidal AC voltage to the motor, keep the motor stationary, measure the current, calculate the power, and calculate the complex impedance, thus Calculate the motor rotor resistance R2' and reactance X2' to achieve the purpose of identifying the electrical performance parameters of the three-phase asynchronous motor. The invention has the characteristics of simple operation and the ability to quickly obtain the electrical performance parameters of the motor when applied in the field, and is applicable to all three-phase asynchronous motors.
Description
technical field [0001] The invention relates to a method for identifying electrical performance parameters of a three-phase asynchronous motor. In particular, the identification method of the electrical performance parameters of the three-phase asynchronous motor is realized by using a three-phase symmetrical AC voltage power supply capable of outputting DC voltage, adjustable output frequency, and adjustable amplitude. technical background [0002] The use effect of three-phase asynchronous motors strongly depends on its electrical, mechanical and mechanical characteristics. Its electrical parameters are an important basis for analyzing motors, designing and manufacturing motors, and motor system design, and are the basis for torque, speed, and energy control during motor operation. Electrical parameters of three-phase asynchronous motors: stator resistance, excitation resistance, rotor resistance, stator reactance, excitation reactance, and rotor reactance are the basis fo...
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Inventor 杨津听李宏王世平洪亚昆李陶赵锦宏高磊鸿赵煜
Owner 昆明电器科学研究所