Most electricians know, three-phase motor three-phase stator windings of each phase winding has two lead the first. One is called the head-end, the other end is called the end. Provisions of the first end of the first phase winding which means that the end D1 D4; second phase windings of the first end which means that the end with the third phase windings of the first end of D3 and D6 to D5; D2. D1 to D6 mark the six lead the first terminal into the terminal box, terminal marked accordingly. The

1 explosion-proof electrical equipment: under specified conditions, will not cause the explosive surroundings lit electrical equipment. 2 explosive mixture: between the lower flammable gas, vapor, mist, dust or fibers and air mixture explosion. 3 Maximum surface temperature: around electrical equipment for explosive atmospheres ignite any parts or electrical equipment electrical equipment within the specified range to work under the most adverse operating conditions may cause any surface maxim

First , CE certification: national products in the European market to trade a unified technical specification, simplifying trade procedures. Any country to enter the European Union, the European Free Trade Area of need for CE certification, CE mark affixed on the product. CE certified products to enter the market of the European Union and the European Free Trade Area countries pass. CE certification means that the product has reached the security requirements of the EU Directive; business to con

1. According to the requirements of the directive on the use of the CE certification mark should be the means by which conformity assessment mode, conformity assessment principles and Council Directive No. 93/465/EEC, eight authentication mode, select the appropriate mode. 2. According to the directive calls for self-assessment or apply for third-party assessment or forced to apply for EC notification procedures recognized certification body, the preparation of the manufacturer of self-assessme

Generation of corona is formed because of the the smooth conductor to produce a non-uniform electric field, when the voltage rises to a certain value in the vicinity of the unevenness of the electrode with a small radius of curvature of the electric field around the discharge occurs due to an air free, corona. Not occur because of the weak electric field in the periphery of the corona collision free, corona peripheral electrically charged particles are basically ions, these ions will form a coro

Who is the object of the CE mark to accept?CE certification mark accepted for EC Member States national regulatory authorities responsible for the implementation of market and product safety control, rather than the customer, when a product has attached CE mark certification, the member responsible for sales of safety oversight authorities should be assumed to meet instruction requires free circulation in the EC market. Who is responsible for the correctness of the CE certification mark?Manufac

Protection technology generally used for three-phase asynchronous motor stator windings burned, overheat protection, over-current protection and phase failure protection. 1, overheat protection part of the view that no matter what the cause of failure will eventually lead to the stator windings of the motor overheating and burning. Therefore, as long as to prevent overheating of the motor windings, also the protection of the motor. But in fact, the motor itself, there is the difference of the t

When the induction motor is in a stopped state, from the electromagnetic point of view to see, like a transformer, received power to the stator winding is equivalent to the primary coil of the transformer into a closed circuit of the rotor winding is equivalent to the secondary coil of the transformer is short-circuited; stator windingand no electrical contact between the rotor winding, the only contact of the magnetic flux through the stator, air gap, the rotor core into a closed circuit. When

The motor noises nothing more than for two reasons: mechanical and electrical. 1 mechanical Such as damage or scratch the motor cooling fan motor housing, motor fixed unstable. The situation in this regard is a good deal, if I could find the source of the noise, generally a good deal. 2 electrical (1) the carrier frequency of the inverter is set too low Appropriate carrier frequency is set higher, but this time will cause some problems if the carrier frequency is so high that they cause int

Practice has proved that, combined with the needs of users in the design of the motor protection (motor protection) should meet the following requirements: 1, using the current sampling This will not only take into account the different characteristics of the flow and phase failure protection, but also fully reflect no matter where phase failure should be reflected in the fact that in the current of the power supply line; avoid the shortcomings and limitations of the sampling program. Use of v