Electric learning dribs and drabs

The choice of cable specification:low pressure parts,we are usually calculated according to current loop,again on this foundation to set aside 35% of the allowance (that is,computing current divided by 0.65),according to the results single phase induction motor compared with the current carrying capacity of the cable select cable; High pressure parts,wholesalemotor.blogspot.com it is in the loop on the basis of the calculation of cable set aside 20% of allowance,which is divided by 0.8 Electrical single phase asynchronous motor five prevention:1 to prevent false points,or circuit breaker.2 to prevent loading and isolating switch.3 prevent charged hang (us) ground wire (switch).4 with a ground wire (switch) circuit breaker (isolating switch).5 prevent straying into charged interval.The low voltage side of transformer is electric motors price quick break according to escape (maximum short-circuit current) three-phase short-circuit current setting.

The category of dc regulated power supply and choose

Dc stable power supply according to the habit can be divided into chemical power supply,linear

regulated power supply stability and switch mode power supply,they respectively have different types:Chemical power source,we used ordinary dry-cell batteries,lead-acid batteries,nickel cadmium,nickel metal hydride,lithium ion batteries are belong to this category,each have their advantages and disadvantages.With the single phase asynchronous motordevelopment of science and technology,and the intelligent battery;In rechargeable battery materials,American researchers found that manganese a iodide,use it can produce cheap,small,discharge time is long,many times after charging still maintain good performance and environmentally friendly rechargeable batteries.Linear stable power supply,linear regulated power supply is a common feature is that it is power device adjusting pipe work in the linear area,stable output by adjust the voltage drop between the tube.

Due to adjust the tube static loss is big,need to install a large radiator to electric motors 12

voltheat it.And because the transformer work in power frequency (50 hz),so the weight

is bigger.This kind of power source advantage is high stability,small ripple,high reliability,easy to make it more road,continuous adjustable output of finished products.The disadvantage is that large volume,heavy,efficiency is relatively low.Such a stable power supply and there are 5kw permanent magnet generator many,from the output properties can be divided into www.dongfeng-motor.com regulated power supply and current regulator and voltage regulator,steady into voltage steady flow (bistable) power supply.From the point of the output value can be divided into fixed point switch to adjust output power,band and several continuous adjustable potentiometer.From the output indicator can be divided into pointer on type and digital display type and so on.

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.