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EMERSON A6410 轴振监测模块
无刷同步电动机由于没有滑环、碳刷等可能产生火花的环节，在化工、煤矿等具有爆炸性环境的场所有着较为广泛的应用。此外，由于去掉了碳刷等易损元件，大大提高了电机的整体可靠性，在一些要求持续长时间高可靠性运行的场合也有着不少的应用。近年来随着节能观念的转变，大量的无刷同步电动机将面临变频改造。EMERSON A6410 轴振监测模块由于无刷同步电动机固有的技术特点，在变频调速运行时，同步电机遇到的弱磁投励、电机逆相运行、变频器-励磁器协同控制等问题，一直制约着无刷同步电动机的变频应用。EMERSON A6410 轴振监测模块 本文基于无刷同步电动机的结构和原理，对无刷同步电动机在变频运行中所遇到的各种问题进行了详细的分析，并根据理论分析和仿真试验的结果对这些问题提出适当解决方法，使变频器能够驱动无刷同步电动机可靠、经济地调速运行。
无刷同步电动机在工频稳态运行时，励磁器向励磁发电机的定子励磁绕组通以适当的励磁电流，在励磁发电机的转子电枢绕组端部感应出三相交流电压，由旋转整流器(等效于二极管整流器)整流成直流电压，施加在无刷同步电动机的转子励磁绕组上，为其提供持续的励磁电流。EMERSON A6410 轴振监测模块根据励磁发电机的物理特性，其输出的电枢电压近似于电机转速和励磁发电机励磁电流的乘积成正比，因此励磁器可以通过调节晶闸管的触发角，调节励磁发电机的定子励磁电流，达到调节无刷同步电动机的转子励磁电流的目的。
Brushless synchronous motors are widely used in explosive environments such as chemical and coal mines due to their lack of slip rings, carbon brushes, and other links that may generate sparks. In addition, due to the removal of vulnerable components such as carbon brushes, the overall reliability of the motor has been greatly improved, and there are also many applications in some situations that require long-term and high reliability operation. In recent years, with the transformation of energy-saving concepts, a large number of brushless synchronous motors will face frequency conversion transformation. Due to the inherent technical characteristics of brushless synchronous motors, the EMERSON A6410 shaft vibration monitoring module encounters problems such as weak field excitation, motor reverse phase operation, and frequency converter exciter coordinated control during variable frequency speed regulation operation, which have always restricted the frequency conversion application of brushless synchronous motors. EMERSON A6410 Shaft Vibration Monitoring Module This article analyzes in detail the various problems encountered by brushless synchronous motors in variable frequency operation based on the structure and principle of brushless synchronous motors. Based on theoretical analysis and simulation test results, appropriate solutions are proposed for these problems, enabling the frequency converter to drive brushless synchronous motors to operate reliably and economically.
When a brushless synchronous motor operates at power frequency steady state, the exciter applies an appropriate excitation current to the stator excitation winding of the excitation generator. A three-phase AC voltage is induced at the end of the rotor armature winding of the excitation generator, which is converted into a DC voltage by a rotating rectifier (equivalent to a diode rectifier) and applied to the rotor excitation winding of the brushless synchronous motor to provide continuous excitation current. The EMERSON A6410 shaft vibration monitoring module outputs an armature voltage that is approximately proportional to the product of motor speed and excitation current of the excitation generator based on the physical characteristics of the excitation generator. Therefore, the exciter can adjust the stator excitation current of the excitation generator by adjusting the triggering angle of the thyristor, achieving the goal of adjusting the rotor excitation current of the brushless synchronous motor.
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