Across the pond, you will find the Deutsches Institute fur Normung (DIN) flange specification, consisting of a variety of European styles which have been unified into one code for the purpose of commonality. Designation as a DIN Flange by the German Institute of Standardization assures the user of design quality the way an ASME flange would here in America. Although much less common than ANSI/ASME steel flanges in the United States, many of our international customers request flanges to these specifications for a variety of applications such as imported steel vessels, cargo ships, and other infrastructure which may consist of metric pipes/valves and European designed equipment.
The subset flanges under the DIN standard consist of the same style of flanges in the United States, including the most commonly used slip on flanges, weld neck, flanges, and blind flanges. Adapter flanges can be custom made to end user requirements for the mating of American flanges to international ones, however we find it is a much more common and easy solution to provide DIN flanges to mate to existing equipment.
The most common metric type flanges fall under the following categories:
DIN 2501 through 2503 for flat ring flanges
DIN 2512 through 2519 for alternate face flanges
DIN 2627 through 2633 for weld neck flanges
DIN 2641 through 2642 for lap joint flanges
DIN 2565 through 2569 for threaded/companion flanges
DIN 2527 for blind flanges
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Interpretation of the characteristics of the inverter motor 2, the electromagnetic design of the general asynchronous motor, the performance parameters that are mainly considered when redesigning is the overload capacity, start-up performance, efficiency and power factor. (Silicon tube, radiator hose) and variable frequency motor, because the critical slip ratio is inversely proportional to the power frequency, it can be started directly when the critical slip is close to 1. Therefore, overload capacity and starting performance need not be considered too much, but must be solved. The key issue is how to improve the motor's adaptability to non-sinusoidal power supplies. The method is generally as follows: 1) Reduce the stator and rotor resistance as much as possible. Decreasing the stator resistance can reduce the fundamental wave copper loss, so as to compensate for the increased copper loss caused by higher harmonics. 2) In order to suppress the higher harmonics in the current, it is necessary to appropriately increase the inductance of the motor. However, the rotor leakage resistance of the rotor slot is large, and the skin effect is also large, and the copper loss of high-order harmonics also increases. Therefore, the size of the motor leakage reactance must take into account the rationality of the impedance matching within the entire speed range. 3) The main magnetic circuit of the variable frequency motor is generally designed to be in an unsaturated state. First, considering the higher harmonics will deepen the saturation of the magnetic circuit, and secondly, considering the low frequency, the output voltage of the frequency converter is appropriately increased in order to increase the output torque. 2. When the structural design is re-structured, the main consideration is also the influence of non-sinusoidal power characteristics on the insulation structure, vibration, and noise cooling modes of the variable frequency motor (recommended: DC motor). Generally, the following issues should be considered: 1) Insulation class, general For class F or higher, strengthen the insulation of the ground and the insulation of the coil, especially the ability to withstand the impact voltage of the insulation. 2) For the vibration and noise problems of the motor, fully consider the rigidity of the motor components and the entire body, and try its best to increase the natural frequency so as to avoid resonance with each secondary wave. 3) Cooling method: forced air cooling is generally used, that is, the main motor cooling fan is driven by an independent motor. 4) To prevent shaft current measures, bearing insulation measures shall be used for motors with capacity exceeding 160KW. Mainly is easy to produce magnetic circuit asymmetry, it will also produce the shaft current. When the current generated by other high-frequency components combine to act together, the shaft current will greatly increase, which will lead to bearing damage. Therefore, insulation measures are generally adopted. 5) For constant power variable frequency motors, when the speed exceeds 3000/min, a special high temperature resistant grease should be used to compensate for the temperature rise of the bearing. Inverter motors can operate in the long-term range from 0.1HZ to -130HZ. Ordinary motors can operate in the range of 20 to 65Hz for 2 poles. 4 poles operate in the 25 to 75Hz range. 6 poles are 30-- 85hz range for long-term operation. 8-pole for long-term operation in 35--100hz range