【文章內(nèi)容簡介】 refore naturally, scattered hot condition is lacked paratively. Generator is realizing energy transition , is internal to produce power loss , so makes generator give out heat. Study to show , is under generator with high speed operation condition , have near 1/3 generator give out heat quantity from generator rotor produce , and the absolutely most of heats that rotor produces are passed through the air gap between rotor and stator in stator。 Others 2/3 the stator that heat produces in generator. So produce the major solution method of giving out heat for generator is the cycle for that generator stator adopts cooling fluid flow to carry out force to cool. Typical cooling system is to cool generator stator with the water type cooling installation of outer circulation , goes to the heat tape of generator. What angle contact ball bearing give out heat , is roller mainly under high speed and the rolling friction between raceway, the etc. that receive the top sliding friction that moment produces as well as the viscous friction of lubricating oil produce. Reduce little bearing to give out heat the major measure of quantity: ( 1 ) reduce the diameter of little ball properly reduce little ball diameter can reduce little centrifugal force and top moment, so, reduce little friction, quantity decreases to give out heat. ( 2 ) adopt new material for example adopt porcelain material do ball, porcelain ball bearing and steel quality angle contact ball bearing are pared with , when high speed turns around ball and raceway between roll with sliding friction reduce little, give out heat to measure reduction. 6 ( 3 ) the lubrication way oil gas of reasonable adopting and the lubrication waies such as oil fog for bearing not only have lubrication role, still have certain cooling role. Service life and the performance of electrical main shafts that design and assembly electrical main shaft will get must carry out elaborate design and production for the electrical every part of main shaft. The stator of electrical main shaft from have is high Dao the high quality flat of silicon steel of magic rate press repeatedly, in stator cavity have to rush system inlay line groove. Rotor from rotor core, squirrel cage and runner shaft 3 partial groups bee. Location precision and the size precision of the case of main shaft will also directly affect the prehensive precision of main shaft. Usually directly design bearing hole in the case of main shaft on, to add to pack generator stator must open at least one end. When the high speed of main shaft spins , any unbalanced quality of Xiao De arouses the vibration of high frequency of big electrical main shaft. Therefore the precision requirement of dynamic balancing of precise electrical main shaft reach G1 G0. 4 levels. For the dynamic balancing of this kind of grade, with conventional method, it is the insufficient dynamic balancing that need to still carry out whole after assembling to carry out dynamic balancing only respectively before assembling for every element on main shaft, even still design special voluntarily balanced system to realize the online dynamic balancing of main shaft. Additionally, when designing electrical main shaft must ply with structural symmetrical principle, key coupling and thread coupling strictly in electrical main shaft on have been prohibited use, and have adopted profit coupling generally, realize torque with this transmit. After profit coupling and thread coupling or key coupling pare have: Will not produce curved and torsion stress on main shaft, as the revolving precision of main shaft does not affect。 the sport control of little electrical main shafts in the machine tool of numerical control in, electrical main shaft usually adopts the method of frequency control. Now, there are the ordinary drive and control of frequency conversion mainly , direct torque and control as well as the drive of vector control actuator control 3 kinds of control way. Ordinary frequency conversion is scalar drive and control, it drives to control property, export power and rotational speed for permanent torque drives into direct ratio. It is thought of that the development performance of the ordinary control of frequency conversion is not enough to manage , in low speed, control performance is not good, export power is not enough to stabilize , also does not have C axle function. But price is cheap , has simple structure , is used in grinding machine and ordinary with high speed milling machine etc. normally. Vector control technology imitate the control of the motivation of direct current, with rotor magic field it is directional , use vector the method of alternating e to realize drive and control, have good development perform