Based on a brushless motor

 In order to facilitate the control system modeling and single phase motor price analysis of needs, we main to control coil current by convention, rather than to control the stator magnetic field. Because we can easily detect the motor current, the magnetic flux (the actual) is difficult to get. In the brushless motor, coil current directly through the three groups produced the stator magnetic field. Because of the three group of coil is man-made according to the installation of 120 - degree Angle difference to each other, so the magnetic field generated by the three groups of coil there is also a 120 - degree Angle difference to each other. And www.dongfeng-motor.com the three magnetic field overlap with the stator magnetic field is produced. 

To flow through the stator coil magnetic field modeling, we introduced the concept of "space current vector". Fixed coil current space vector has a fixed magnetic field direction, it 3 phase induction motor is entirely by magnetic flux through a coil coil size and the current interaction. In this way, we can use the space current vector ac motor to represent the stator magnetic field, the space current vector is of three groups of coil current generated by the vector space superposition. Explain the space current vector is an intuitive way, we can assume that the stator consists of a set of coils, only this group of coil and the current generated by the magnetic field and the superposition of three groups of coil to produce magnetic field in front of is the same.

Voltage current transformer applications

Capacitive pressure machine available in high pressure and ultrahigh pressure used to measure the motor vehicle spare parts voltage and the power is in the power system, electric energy metering, relay protection and automatic ac electric motor control, etc., and can double as coupling capacitor is used for power line carrier communication system. If you have any requirements, can provide for harmonic voltage measurement of internal and external terminals. (1) the installation run place: indoor or outdoor. (2) above sea level: product no more than 330 kv and below 2000 m. 500 kv products no more than 1000 m, according to the order, can offer until 4000 m plateau type products. (3) temperature: - / + 40 degrees, 40-25 / + 45 degrees. Selected by the user in order (also can choose other temperature classes). 


(4) wind speed: not more than 42 m/s. (5) pollution level: Ⅰ level electrical motor filthy (outer insulation creepage distance 17 mm/kv or higher); Filth Ⅲ level (outer insulation creepage distance 25 mm/kv or higher); Filth Ⅳ level (outer insulation creepage distance 31 mm/kv or higher). Pollution level in by the user to choose when you order it. (6) ice thickness: not more than wholesalemotor.blogspot.com 10 mm. (7) seismic intensity: no more than 8 degrees. According to user requirements, also can provide higher seismic ability of the product. Rated frequency (8) systems: 50 hz or 60 hz have users in order is determined. (9) system earthing conditions: neutral point grounding or neutral not effective effectively; Be determined by the user in order.

Three-phase asynchronous motor efficiency and power factor

Induction motor efficiency and power factor is contradictory.For the same kind of Y series motor,high efficiency,low power factor.On the other hand,low efficiency,high power factor,high power,good for motor use; The power factor is low,will reduce the network transmission efficiency,because of low power factor,so the grid reactive power loss is big.So for ac induction attack efficiency indicators put forward higher requirements of wholesalemotor.blogspot.com both,puts forward higher requirements to the power factor index.The efficient and high voltage three-phase asynchronous motor,it overcomes the defect of old asynchronous motor,its insulation thickness thinning by the original unilateral 1.5 mm to 1.3 mm; Innovation design of star - Angle joint series hybrid hard winding method,reduce the stray loss of the motor,greatly improving the efficiency of the high voltage motor;Motor efficiency is low,the loss is big.For ac motor,is the resistance loss,in this way,the greater the loss of P in the power triangle,the greater the power factor Angle phi is smaller,the greater the power factor cos phi.Conversely,high efficiency,low loss,P is in the power triangle is smaller,the power factor Angle phi is smaller,the power factor cos phi is smaller.In

order to satisfy the motor power factor,efficiency,two indicators,the backward of the structural

design of centrifugal fan,a significant reduction in the high efficiency high pressure loss in the

three-phase asynchronous motor machinery and noise.The efficient high-voltage three-phase

asynchronous motor can not only improve the work efficiency of the motor,and can also achieve the goal of reducing energy consumption,will be widely used in power stations,petrochemical,urban water supply,cement,paper making,metallurgy,coal and other industries,has an extremely extensive application prospect in the market,has significant economic and social benefits.Shell directly related to the personal safety and equipment protection grade selection of reliable operation,should

be based on motor using occasions,to prevent human exposure to the motor internal dangerous

parts,prevent solid foreign body into the chassis,prevent water from entering the shell cause harmful effects to the motor.Motor by letters IP protection grade plus two characteristics of Numbers,the first characteristic figures show that Motor vehiclethe solid proof,the second feature figures show that the liquid.It is widely

used in industry and People's Daily life.This kind of motor stator system group composed of group

working system and starting winding.Its working principle are similar to those of three-phase

asynchronous motor.The author through the analysis of the working principle of the single-phase

capacitor motor to illustrate its positive &negative or transform a one-way operation of single-phase capacitor motor for positive and negative transfer lines of practical control circuit.A.Simple working principle 1.When you don't answer the capacitance starting winding can a single phase or three phase asynchronous motor starting or running conditions,in terms of this item is set to the

current in the winding of motor in whether can produce a rotating magnetic field.If not in the

starting system group of the single-phase capacitor motor concatenated appropriate capacitor Tend to

attend.If you want to improve the power factor,should reduce the motor air gap,increase the serial

number of turns per phase.And rotor balancing machineto improve efficiency,increase should be ac motor air gap,which can reduce the harmonic stray loss,due to the harmonic stray loss and air gap of 1.5 ~ 1.6 power ratio.The two measures the reverse.When turn the timer can't start again,to the motor shaft by hand a little at this time can turn the rotation of the external force.After inspection found that the washing machine in the two capacitors,there is a short circuit phenomenon in a capacitor,the only change after short circuit capacitor in the same specification,then turn the timer when the normal operation of washing machines.In the washing machine motor is the typical positive &negative use capacitor motor control mode.Single-phase capacitor start motor is one of the single-phase asynchronous motor.

Brushless motor hall installation

In a power cycle,each coil winding brushless motor internal change the Angle of the current direction is the phase Angle of wholesalemotor.blogspot.com brushless motor,electric bicycle brushless motor Machine commonly used phase Angle in both 120 and 60 degrees,the phase Angle of 60 degrees or 120 degrees of centrifugal pump brushless motor and brushless controller to drive,phase Angle The controller can't direct swap.Brushless motor has three hall element,they shoulder the task of inform controller when to change the direction of current,for different phase Angle,the installation position of the hall element Different,in general,the phase Angle motor fan of 60 degrees of three hall element should be placed parallel;The phase Angle of 120 degrees of three hall element should be parallel to,but one in the middle A hall element in turn state.

YCL single phase high torque small ac electric motors

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