A bearing, the outer bearing ring, during which the rolling elements such as balls or rollers and other parts of the holder, relative movement between them, the relative movement between elements of the impact on irregular Noises. So bearing sound often distributed over a wide frequency band, low-frequency portion of the inner and outer eccentric or irregular, or rolling elements arranged in irregular spots and other precision rotation effect, causing the rotation frequency or frequency noise an

Property values by inspection characteristics can be divided into sampling Sampling Inspection and measurement sampling two categories. Counting the piece also includes sampling and sampling point count sampling, sampling is based on the piece in the sample being tested several substandard products, infer whether the entire batch of products received; whereas interest point sampling is based on the sample was seized the product contains the number of unqualified inferred entire batch of products

Mechanical characteristics of the motor, start, braking, speed and control performance should meet the requirements of the mechanical properties and production process, the impact the motor course of their work on the quality of power supply (such as voltage fluctuations, Xie wave interference), should be within the limits of; Cooling method according to a predetermined operating system, Kiev circumstances as determined by the motor power, the temperature rise of the motor should be limited wit

With the shortage of resources, countries are looking for energy-efficient way to tap the energy-saving potential of the motor, saving way to find effective is an effective way. There are a variety of motor energy saving methods, such as improving the efficiency of the motor, improve the power factor of the motor speed control and energy saving, VVVF control. Now to discuss the motor power factor energy saving. Asynchronous motor power factor varies with the load, rated load power factor, low p

Routine maintenance is very important to reduce and avoid motor failure in the operation of one of the most important aspects of the inspection tour and promptly remove any irregularities lead to the root cause. Serious accident analysis in the event of an accident, take measures to reduce the stop when the number of accidents and repair essential technical work to improve the efficiency of the motor is running the day-to-day maintenance of the motor run its normal course, very important, but ru

The power of the motor. To select the required power should be based on production machinery, try to keep the motor running at rated load. Options, should pay attention to the following points: (1 If the motor power is selected too small. Appears small horse cart phenomenon, caused by the motor overload long-term to insulate heat damage. Even the motor is burned. (2) If the motor power option too. There will be a big horse car phenomenon. The output mechanical power can not be fully utilized,

Efficient motor is a generic standard type motor having a high efficiency motor. Efficient motor design, materials and workmanship to take measures, such as the use of reasonable stator and rotor slot number, the fan parameters and sinusoidal winding measures to reduce losses, the efficiency can be increased by 2% - 8%, an average of 4%. In 2002, the Chinese motor total capacity of approximately 400 GW, of which almost 80% for small and medium 660TW ?h of the annual electricity consumption. 87%

First, explosion-proof electrical equipment is divided into two categories: I class coal mine electrical equipment; electrical equipment used by the II place outside the mine. Class II electrical equipment is divided into three categories: IIA.IIB.IIC. Second, to understand the division of the explosion-proof grade, first look at the explosive gas mixture at the ignition temperature of the grouping: group with T1.T2.T3.T4.T5.T6 that the ignition temperature t (° C), the ignition temperature of

Motor noise generated in different ways, can be broadly divided into electromagnetic noise, mechanical noise and aerodynamic noise. Determine the various categories of noise of an electric motor, usually requires a combination of several methods to achieve. Analysis of the mechanical noise of the motor used to cut off the power supply method, the noise generated by the motor by the inertia continue to operate after power outage for the main part of the mechanical noise; electromagnetic noise ch

All grid-connected wind generator through a three-phase alternating current (AC) motor mechanical energy is converted into electrical energy. The generator is divided into two main types. Frequency synchronous generator operation and it is connected to exactly the same frequency of the grid, the synchronous generator is also known as an alternator. Asynchronous generator running frequency is slightly higher than the grid frequency, the asynchronous generator often referred to as induction genera