What are the characteristics of the salient pole windings of the motor
Squirrel cage type and winding type two kinds of rotor winding of AC induction motor. Squirrel cage type structure is relatively simple, generally by the aluminum alloy casting in the rotor iron core slot and from both ends of the end ring short connection; but also useful for copper strips are embedded and welded on the copper end rings. In order to improve the starting performance, the squirrel cage type can be made into deep groove type and double cage and other special type. Winding of the winding and the stator winding is the same as the stator winding, which can be used in the form of a wave winding. The form of the wave winding is made of a single or a few turns of the rod. The two element is welded into a coil in the end, and the winding is different from the winding. Wave winding is often used for large AC motor rotor windings and DC motor armature windings.
Of the stator winding connection form different polarity motor according to the polarity relations, divided into salient pole type and Shu pole type two types.
Explicit winding
A motor stator with four salient poles, each of which forms a magnetic pole; and the polarity of the formation of the adjacent two coils is different; four poles are formed on the four salient poles. Therefore, in the explicit pole type windings, each group of windings form a pole, that is, the number of windings and the number of poles are equal. In addition, in order to make the adjacent poles can be N, s polarity pairs exist, it must be the opposite of the current direction in the two groups of adjacent coils. So the connection mode of two adjacent coils must be connected in series, which is called "joint" and "tail" ".
Industry focus
With the deterioration of the environment, the lack of resources, energy conservation and environmental protection concept is becoming more and more deep into the economic and social development, all countries in the energy saving technology and the promotion of investment. Along with China's "Twelfth Five Year" energy saving and environmental protection industry planning, the introduction of energy saving and environmental protection has been pushed up a new height. According to the investment adviser released by the 2011-2015 in China's energy efficiency motor industry investment analysis and forecast report shows that the total capacity of the motor installed capacity has reached more than 4 KWh, the annual electricity consumption of 1.2, accounting for 60% of the total electricity consumption, including the total installed capacity of wind turbines, pumps, compressors, the annual consumption of 800000000000 KWh, accounting for 40% of the total electricity consumption. Most of these motors are running in the lower power utilization rate, as long as the electric energy utilization rate of these motors can be improved by 10 to 15%, at least 10000000000 KW can be saved for the whole year. Enough to see the great potential and importance of the motor energy saving market. Motor energy consumption phenomenon is serious, not only increased the cost of production, resulting in a great waste of electric energy, but also with the implementation of China's energy-saving emission reduction strategy is not consistent. At present, the energy consumption of motor can be effectively changed by improving the operation efficiency of the motor, the energy saving effect is very obvious, and the energy consumption can be reduced by 20% to 30% compared with the ordinary motor. Motor energy saving the main way, one is by the frequency conversion speed control system, improve the efficiency of the frequency conversion motor two is the use of high efficiency motor.
