Motor winding embedded line maintenance

Wound rotor motor is a class of asynchronous motor. Asynchronous motor is according to the rotor winding form, divided into wound rotor and cage. The working principle of asynchronous motor is when the three-phase stator winding of the motor (the difference between 120 degree Angle), after the ventilation with balanced three-phase alternating current (ac), will produce a rotating magnetic field, the rotating magnetic field cutting rotor winding, thus produce induced current in the rotor winding, rotor winding is closed path), the rotor of current-carrying conductor under the effect of the stator rotating magnetic field will produce electromagnetic force, as to form the electromagnetic torque on the motor shaft, drive motor rotation, and the motor rotating direction and rotating magnetic field in the same direction. So the asynchronous motor is also known as induction motor. 1 composition and the function Three-phase asynchronous motor consists of stator and www.facebook.com/dongfeng.motor rotor two basic parts. Is the fixed part of the motor stator, to produce a rotating magnetic field, mainly by the stator core, stator winding and base parts. The rotor is rotating part of the motor, the rotor iron core and rotor winding and the rotor parts, its effect is obtained rotational torque under the action of a rotating magnetic field. Different rotor according to its structure is divided into squirrel cage rotor and rotor winding. 

Two basic characteristics and USES asynchronous motor Asynchronous motor mainly used as a motor. It is the industrial and agricultural production and the most widely used in national economic sectors and demand one of the biggest motor. Metal cutting motor part machine tools, steel rolling equipment, air blower, grinder, water pump, oil pump, light machinery, textile machinery, mining machinery, etc., the vast majority USES the asynchronous motor drive. In people's everyday life, the application of the asynchronous motor is increasingly widely, such as magnetic generator electric fans, washing machines, refrigerators, air conditioning and other household electrical appliances, the use of single-phase asynchronous motor. Drag motor for electric drive, the vast majority of asynchronous motor, its power consumption accounts for about 60% of the total load of power grid. Asynchronous motor is widely used because it has a simple structure, convenient use, reliable operation, high efficiency, and easy, low cost, etc. Asynchronous motor itself, the high performance is poorer, to have a broad smooth speed range, generally USES the dc motor. Nearly one hundred and twenty years, on the basis of the power electronic device and a microcomputer developed ac induction motor speed control system, make the speed regulating performance of asynchronous motor is able to change, and thus its application more widely. 

Asynchronous motor is running, must absorb reactive power from the grid, which will make the power factor of power grid. Due to the power factor of power grid can use other way to compensate, so this does not prevent the widespread use of asynchronous motor. Main classification 3 asynchronous motor Many different kinds of asynchronous motor, have different classification from different angles. According to the number of stator phase points are single-phase asynchronous motor, three-phase asynchronous motor. According to the rotor winding form, generally can be divided into wound rotor and cage type two kinds. Squirrel-cage asynchronous motor, and a single cage, double squirrel cage and deep slot. According to the size of the motor or power, is divided into large, medium, small size and low power motor. According to the motor protection form into open, protected, enclosed. In addition, you can press the motor run time of ventilation and cooling, installation structure, insulation class, working methods such as classification, here is differ a list.

The present situation of the stepper motor electrical engineer

Step motor has become the third class except dc motor and ac motor motor. Traditional motor as an electromechanical energy conversion device, in the human production and life into play a key role in the process of electrification. But in today's human society into the era of automation, the function of the traditional motor can not meet all sorts of motion control system such as factory automation and office automation. To meet these requirements, development of a series of new motor system has the control function, which has its own characteristics, are widely used and category is stepping motor. General electrical engineer is pointed out that the development of stepper motor is closely related to the computer industry. Since the stepper motor in the computer peripheral equipment to replace later, small dc motor to improve the performance of the equipment, quickly promoted the development of the stepper motor. On the other hand, the development of the microcomputer and digital control technology, and will perform component as the numerical control system of step motor applied to other areas, such as electric machine, small power mechanical processing machine tools, electric motor cooling fan measuring instruments, optical and medical equipment, packaging machinery, etc. 

Mature process, any kind of products are basically specifications varieties gradually unify and simplify the process. Now, the development of the stepper motor has come down to the reluctance of single conductor structure type, the structure of the hybrid and claw pole permanent magnet three categories. Cheap, the claw pole motor performance index is not high, the hybrid and magnetic resistance type main motor as high resolution, because the hybrid stepping motor has small control power, good running stability and gradually in a dominant position. The most typical product is two phase 8 50 gear motor, step away from the Angle of 1.8 ° / 0.9 ° steps (full/half); And five phase 10 pole 50 tooth and some rotor 100 teeth of two and five phase motor fan stepper motor, five phase motor is mainly used in the occasion of high performance. So far, the industry developed countries very rare magnetic resistance type stepping motor. Stepper motor of the biggest producers were Japan, such as Japanese servo company, Oriental, SANYODENKI and MINEBEA and NPM company etc., especially east company in Japan, whether the motor performance and appearance quality, or the means of production, all is the best in the world. Now Japanese stepper motor output (including foreign owned company) nearly 200 million units. Another conclusion is type HB stepping motor is more suitable for low speed high torque purposes; The RM type is suitable for the smooth running and speed greater than 1000 r/min purpose; And at the time of the low speed PM type of low cost, vibration and high speed, large torque of three-phase type PM stepping motor is better than the performance of the two phase motor.