Three-phase asynchronous motor current sampling resistance

Sampling resistance is also known as current resistance, electric flu resistance measurement, sampling resistance, current induced resistance. General English translated into from resistor, Current sensing resistor. With simple words description is a resistance smaller resistance, series in the www.dongfeng-motor.com circuit used in the current into a voltage signal is measured. Such resistance, it is divided according to the function of the products use resistance. Sampling resistance function is used as the reference, commonly used in a feedback circuit, stabilized voltage supply circuit, for example, to make the output voltage constant state, want to part from the output voltage is the voltage for your reference (the form of generator set spare parts commonly used sampling resistor), if the output is high, the input is automatically reduced voltage, reduce the output; If the output is low, the input is raising voltage automatically, try output to rise. 


Commonly used in power supply products, or electronic, digital, power supply part of the mechanical and electrical products, powerful. In numerous electronic products are often see sampling resistor. Sampling resistance generally use is precise resistance, low resistance, high precision, generally in resistance precision within + / - 1%, higher requirement of use when resistance with 0.01% accuracy. The majority of domestic production is based on manganese bronze material plug-in small diesel generator resistance, however, the majority of users have more need of strips of high precise resistance to achieve the function sampling, this is in order AC synchronous generator to meet the requirements of product miniaturization product production automation. Able to produce at low temperature coefficient, high precision, low on resistance to meet user requirements manufacturers in domestic is very little resistance.

3 okw motor, 380 v voltage. The power factor is 0.2, could you tell me how to calculate the rated current?

Rated current I = P30KW U0.38 KV / 1.732 * * 0.2 = 227.9081 A, but electric motor 12v 500w 30 kw motor power factor can't be so low ah, do you want to calculate no-load running current of motor. The question you ask is problematic. ac three phase motor 30 kw motor power factor should be above 0.75. If according to the capacity of current rating: I = P30KW U0.38 KV / 1.732 * * 0.75 = 60.7755 A. Teach you two formula, very useful: "capacity divided by the number of kv, dealer by coefficient of seventh. "A kw, two current" can estimate the rated current of three-phase motor. Low power factor, then the acmotor2.blogspot.com motor should be banned the example of the net. Line current of three-phase ac asynchronous motor I material 2 P, P - power, kw. I material 2 x 60 kw motor current 30 = 60 a.

The cause of the motor heat have?

Motor in people's life and production as the indispensable important power provider,chance of

appearing in the process of using a lot of electric hot phenomenon,but a lot of people don't know how to solve the more serious is that I don't know what causes fever of motor,it should be in the motor control first,in use process by xi electric vehicle motor'an motor repair shop today professional and technical personnel to introduce you to the cause of the motor heating. Constant to motor,the summer sales First,in the process of the use of the motor due to overload or overload,motor in the process of operation will appear the phenomenon of fever,this definition is very strict,if in the process of use is not in

accordance with the tonnage,approved by the motor is not only in the process of motor use will

shorten the service life of the motor,more serious is that will cause security problems.Second,the cooling fan is not normal work can also lead to the use of the motor in the process of electricalmotor1.blogspot.com the phenomenon of fever,everyone knows that one of the largest in the process of the use of the motor cooling cooling fan near the motor itself,but because of the cause of the dust in the process of using or not often maintenance,can lead to a cooling fan can not work normally,that is to say,will not be able to play their function of heat dissipation.Xi 'an motor repair shop of professional and technical personnel suggest everybody,in the use of motor used in production and life,must pay attention to the detail problem,that is to say,at the motor fan time of use,want to undertake according to the standard of operation,another is to ensure the daily inspection and maintenance,it is in production,we must do as long as the best of these products inspection and maintenance,in in the process of production can be profitable.

Vice winding single-phase electric machine Lord judge method

Vice winding single-phase electric machine Lord in manufacturing,the basic follow the winding impedance is small,the principle of three phase generator impedance is bigger and vice winding.This helps prolong capacitor discharge time,enhancing the effect of phase shift capacitor.The first step is to use a multimeter find resistance from three fuses the two largest root lead,remaining a lead is the deputy winding is connected to the public end.As shown above in the largest lead resistance between a and c,b is lead the public end.Motor vehicle In the second step,using a multimeter measure public end and the other two root,the resistance between the lead connection at the end with the larger one of the lead resistance Between the winding is acmotor2.blogspot.com winding.Connection between smaller a lead winding is the main winding.As shown in figure in the BC lead the resistance between the larger,lead c is vice winding wire.Between ab resistance is small,the lead is a main winding wire.

high performance single phase electric motor ML motor

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