The motors are widely used in industrial, commercial, utilities and household appliances, and other fields, as fans, pumps, compressors, machine tools and other equipment, power. In general, the industrialized countries and developing countries, the power consumption of the motor in the total electricity consumption accounts for a sizeable proportion. Since the 1970s, the first energy crisis, the United States on an extensive survey of the motor electricity consumption. According to the U.S. Dep

1, do not design too slim or flat motorMotor design and strive to get the best performance with a minimum of materials and costs. In general, flat motor with less iron, copper more, more structural materials. Elongated motor with iron more with less copper, less structural material, but poor stiffness of the structure. Therefore, the diameter and length of the ratio of the motor there is an optimum value. The inner circle and the length of the core ratio of about 1:1. The design motor to optimi

To do a good job of rolling bearings of the high-pressure explosion-proof motor selection, we must first understand the explosion-proof motor field use conditions, including load driven by the motor (pumps, fans, compressors, etc.), work system, frequent start, load fluctuations; followed by the full analysis of site conditions based on the selected type of rolling bearings, and to determine the configuration of the front and rear bearings; Finally, based on a bearing life calculation to determi

Depending on the thread for different purposes can be divided into: 1 metric standard thread (International Metric Thread System): China's national standard CNS using threads. Crests of the plane, easy turning, compared with arc-shaped teeth at the end, in order to increase the thread strength. The thread angle of 60 degrees, M represents specifications. Metric thread can be divided into Coarse and fine pitch. Notation such as M8x1.25. (M: Code 8: nominal diameter, 1.25: pitch). 2 standard

At present, the international development of motor efficiency standards in the United States, Canada, Mexico, Brazil, Australia and New Zealand. China was in the beginning of this year issued a motor energy efficiency standards, and will officially take effect on August 1, 2002. Agreement on the EU-wide European motors and power electronics manufacturers Association (CEMEP) indicators, although not as a European directive, but the EU environmental and energy-saving programs have been included in

Storage period of more than six months or shut down more than 2 months after the use of explosion-proof motor, you should check the condition of the bearing device. If there is serious pollution, oil, oil dry, parts, corrosion and other conditions, explosion-proof motor bearing device disintegrated, thoroughly clean the bearings and bearing parts (filling pipe, bearing cover, bearing cover, block oil ring, oil drain boxes, etc.), and then re-lubrication. Rolling internal should be filled grease

A lot of the geometry of the motor core size, winding size, dimensions, mounting dimensions, the size of a variety of other structural components. But what kinds of main dimensions: the motor electromagnetic process is mainly carried out in the air gap, the form of energy conversion is carried out through the main air gap flux. The main dimensions must be closely related to the air gap. Practice has proved that, near the airgap armature diameter (D) and the the core effective length (LEF) is the

In order to improve the accuracy and repeatability of the test motor efficiency for small and medium-sized asynchronous motor by measuring each loss component so as to strike a loss of efficiency analysis. But the specific methods used in the international are not uniform. Motor efficiency test method standards used in different countries and regions, their main difference lies in the treatment of stray load loss. IEEE-112b provisions of stray load losses determined by the input and output metho

In the disassembly of the bearing should note the following: (1) In the process of dismantling should pay attention to the protection of motor surface explosion avoid the bump and scratch, explosion-proof motor overhaul of the rolling bearing device shall comply with the standard GB3836.13-1997 explosive gas atmospheres electrical equipment - Part 13: explosive gas the relevant requirements of the environment with the maintenance of the electrical equipment. (2) to maintain the bearing and the

Classification of three-phase asynchronous motor 1, according to the three-phase asynchronous motor rotor structure Can be divided into squirrel-cage motors and wound motor. 2, according to the three-phase asynchronous motor protection type Can be divided into open type (IP11) three-phase asynchronous motors, protective three-phase asynchronous motors (IP22 and IP23) enclosed three-phase asynchronous motors (IP44), explosion-proof three-phase asynchronous motor. Open type (IP11): the price