变频器精度选型（Frequency converter accuracy selection）.doc

变频器精度选型（Frequency converter accuracy selection） Foundation of equipment supervision: selection and practice of low voltage large power converter Abstract: the correct selection of frequency converter is essential to the normal operation of mechanical equipment electronic control system. Selection of frequency converter, should start according to the actual situation of the enterprise, reasonable choice of converter voltage level in a certain power range (below 1000Kw) to select the low voltage inverter at the same time, according to the type of machinery and equipment load torque characteristics, speed range, speed and accuracy of static starting torque and the use of environmental requirements, determining the choice of control the way and the protection level of inverter. Key words: frequency converter accuracy selection The inverter is mainly used for adjusting the speed of AC motor, speed control scheme is ideal, with the rapid development of the whole China economy, market to drive product requirements gradually increase, inverter speed range to its wide speed and high precision, fast dynamic response, in many speed control play an increasingly important role in the field of application, it has good speed performance, but also has significant energy saving effect, especially the application of frequency converter in fan and pump, the load in the number of applications of various sectors of the national economy is numerous, widely distributing, huge power consumption, and the speed range is limited (50% - 100%). Is a very promising field of application. Take the power plant for example, a large number of boiler auxiliary transmission system capacity is generally large, there is a serious energy waste when running at fixed speed. The high power converter, can be in power plant boiler fan and pump equipment such as boiler, blower, boiler fan, boiler water feeding pump, condensate pump, water pump, slag mortar pump for supporting or transformation, energy-saving ef