A method suitable for measuring no-load characteristics of self-excited large synchronous motors
A technology of synchronous motors and no-load characteristics, which is applied in the direction of motor generator testing, measuring electricity, and measuring devices. accurate effect
Active Publication Date: 2020-05-19
HUAZHONG UNIV OF SCI & TECH
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Problems solved by technology
Moreover, for large-scale hydroelectric generators, the speed is determined by the water turbine. Under normal circumstances, the water flow rate has already fluctuated greatly, so it is difficult to ensure that the motor is stably at the rated speed, which results in a large error in the measured no-load characteristics
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[0044] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.
[0045] Such as figure 1 As shown, the no-load characteristic measuring method suitable for self-excited large synchronous motor of the present invention comprises the following steps:
[0046] (1) When the motor speed increases to a certain value, the motor will naturally slide and decelerate depending on its own mechanical inertia;
[0047] Specifically, to start the motor, in order to avoid the influence of resistance at low speed, when the motor speed rises to 80% of the rated speed, for a motor with a prime mover, the prime mover will not work, so as to avoid the influence of the prime mover s...
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The invention discloses a no-load characteristic measuring method suitable for a self-excitation large synchronous motor. According to the method, the accurate motor counter electromotive force is obtained through calculation according to the terminal voltage, the terminal current and the synchronous reactance, an excitation exciter does not need to be additionally arranged to ensure the completeno-load state of a terminal, and measurement can be carried out by directly utilizing an excitation system of the motor per se; the voltage at the end of the motor is converted into the voltage valueat the rated frequency, the rotating speed of the motor is not required to be stabilized at the rated value, and the measurement difficulty is effectively reduced; in the process of calculating the counter electromotive force, the method fully considers the saturation effect of the reactance when the exciting current is large, so that the counter electromotive force obtained through calculation ismore accurate, meanwhile, a d-axis and q-axis synchronous reactance change curve of the motor after saturation is considered can be obtained, and research on other aspects such as motor control is facilitated.
Description
technical field [0001] The invention belongs to the technical field of motor testing, and more specifically relates to a method for measuring no-load characteristics of a self-excited large synchronous motor. Background technique [0002] The no-load characteristics of synchronous motors are of great significance for testing the manufacture and design of motors, and at the same time characterize the saturation characteristics of motor inductance, which is also crucial for its stability analysis. Therefore, the no-load characteristic test is one of the performance tests that must be carried out and assessed after the motor leaves the factory and is transported to the installation site. [0003] The existing no-load characteristic measurement is carried out according to the method recommended by the national standard GB / T 1029-2005. This method requires the motor to be at the rated speed, and the separate excitation system is used to ensure the complete no-load state of the ma...
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IPC IPC(8): G01R31/34
CPCG01R31/343G01R31/346
Inventor 周理兵马一鸣王晋肖洋
Owner HUAZHONG UNIV OF SCI & TECH