Capacitor start motor

 In capacitor start motor,start capacitance and start winding string together,thus forming a LC circuit,the circuit has good phase shift (and thus have a very good starting torque).The resistance for the motor will also increase the cost.Fixed phase capacitor motor Another motor is fixed phase capacitor (PSC) motor (i.e.,capacitor motor) up and running.This kind of motor operation mode is similar to the capacitor start motor described above,but it does not have the centrifugal switch,so its secondary winding is connected to the grid.PSC motor is usually used in hair dryer,electric fans,blowers,and other need to change.Under the condition of invariable load by changing www.dongfeng-motor.com the running winding signal to achieve the purpose of make the motor run at different speeds.All six winding connection respectively,a three-phase motor can connect two winding together through the rest of the a winding capacitance connected to start winding to run into one capacitor start motor.The repulsion motor Repulsion motor is single-phase ac motor rotor winding,it is similar to ac/dc motor.In the repulsion motor armature with brush nipple rather than and in series with the magnetic field.

Already have a few kinds of repulsion motor into production use,but most of all,with repulsion start sensing (RS)-IR motor operation.RS-IR motor with a centrifugal switch all the short commutator connect together,so when it is up to full speed it will run in the form of induction induction motor sales motor.RS-IR was used in the motor under low temperature and low voltage per ampere provide large starting torque.In 2005,almost did not sell any type of repulsion motors.Single-phase ac synchronous motor Small single-phase motor can also be designed to be magnetized rotor.This does not require any motor in the rotor induction motor,so they will not be lower than the main frequency.Instead,they will be as the rotation frequency synchronization.Because of their high speed precision,this kind of motor is typically used in electric power mechanical clock,record machine and tape recorder; They are also used in such as ribbon machine and telescope driving mechanism requires precise time of equipment.Shaded pole type synchronous motor is one of them.Because of inertia,so it is difficult to the rotor from state stopped immediately accelerated to synchronous speed.This kind of motor usually need some special way to start.A variety generator rotor and stator of different Design with a small induction motor (it will share the same and the synchronous motor excitation coil and rotor) or one-way speed (guarantee the rotor startup positive speed) as the very light of the rotor.

The difference between the speed reducer and frequency converter speed control Electrical engineers

Through the difference between the speed reducer and frequency converter speed control of mechanical devices often need to adjust the speed of three-phase asynchronous motor,often use reducer adjustment change frequency reduction ratio or transducer to adjust the speed of the motor. But by what is the difference between the speed reducer and frequency converter speed control? Together (see electrical engineer) to take us to get to know it.Reducer speed:Reducer is through mechanical transmission device to reduce the motor (motor) speed,such as common gear deceleration,turbine worm reducer,etc.Through the reducer to adjust the speed of the motor general need to make sure the following information:1,the types and specifications of the motor,speed,power (or torque),starting characteristics,short-term overload capacity,the moment of inertia,etc.

2,the types of mechanical work,specifications,purpose,rotational speed and power (or torque). Working system: constant load or changing load,variable load load diagram; Rev.,braking and short-time overload torque,start frequency; Shock and vibration levels; Direction of rotation,motor and reducer coupling way,whether the shaft extension with radial force and axial force.3,installation type (reducer and motor,the relative position of working machine,vertical and horizontal).4,transmission ratio and the margin of error.5,environmental temperature,air velocity,dust concentration and environmental conditions such as ph value; (if there is a circulating lubrication and cooling conditions,lubrication station) and the limitation on the vibration and noise.6,to the degree of service life,Motor vehicle safety and reliability requirements.7,the requirement for the size and weight.8,the demands induction motor price of operation and control.9,the source of material,blank,standard parts and inventory.10,on volume,cost and price requirements.

11 and delivery term.Frequency converter speed control:Inverter is by changing the frequency of alternating current motor (motor) in order to achieve the purpose of speed regulation. Reduce the motor speed by the frequency converter,you can achieve the goal of energy saving. But generally within 0-50 hz frequency conversion motor to realize the constant torque speed control,within the scope of 50-100 hz to realize constant power speed regulation,and stepless speed regulation,wide speed range.To sum up,through the difference between the speed reducer and frequency converter speed control is mainly: reducer speed a wider range of speed (slow),but generally not stepless speed regulation,speed regulating motor after a lot of physical and electrical parameters can be continued,in addition to the speed loss; And use frequency converter speed control can realize stepless speed regulation,but limited range of speed (only within 3 -- 100 hz speed),speed when affected by a lot of electric parameters,and can't guarantee the original motor of the number of parameters,and fever more serious.

Three-phase asynchronous motor wiring diagram

Three-phase asynchronous motor wiring diagram:three-phase three-phase motor stator winding of each phase winding has two thread ends.A head is called the head end,on the other side called terminal.Provisions of the first phase winding head end with that D 1,end in 4 D;acmotor2.blogspot.com The second phase winding head end with D2,said end D5 said;The third phase winding end of the first represented respectively with D3 and D6.The six thrum import terminal connector,terminal marked accordingly D1~D6 tag,as shown in figure (1).Six of the three-phase stator winding end three-phase stator windings can be A star or triangle,y connection is to the end of the three-phase winding up magnet prices in parallel,the D4,D5,D6 three terminal with copper link together,and the three-phase winding head end access three-phase ac power supply respectively,the D1,D2,D3,respectively connected to A,B,C phase power source,as shown in figure 

(2).And triangle by law is the first end of the first phase winding to the 1 D connected to the end of the third phase winding D6,access to another phase power;Head end of the second phase winding connected to the end of the first phase winding D4 D2,and access to the second phase power;Head end of the third phase winding D3 connected to the end of the second rotor and stator phase winding D5,and access to the third phase power supply.Admiral in the patch panel terminal and D6 D1,D2 and D4,D3,and D5 connect with copper,then access to the three-phase power supply respectively,as shown in figure (3).An electric motive is pick a star or triangular,should depends on factory rules,available from the motor nameplate.Is the first of the three phase stator winding end manufacturers set beforehand,in no case can be generator parts stator arbitrary upside down,but the first end of the three-phase winding can be conversed together,such as the end of the three-phase winding D4,D5,D6 upside down as the head end,D1,D2 and D3 as an end,but never separate the ends of the head of a phase winding upside down,otherwise will produce wrong wiring.If wrong wiring junction box found raw,or winding end of the first mistake,light can't the normal starting motor,electric cause starting current is too large for a long time,motor heating is serious,affect the life,or burning motor winding,short circuit or power.

Currently there are 5 kinds of electric vehicles

brush series brushless dc motor,permanent magnet dc motor,ac motor (induction motor),permanent magnet synchronous motor and BLDC motor FM.Brushless dc series motor are: the advantage is that big start torque,overload capacity is strong,the disadvantage is that need to change the carbon brush,high speed has the ring of fire,not suitable for high speed running,low efficiency,large volume,protection and energy feedback is poor,mainly used in electric tricycle.Brush with permanent magnet dc motor: advantage is better than brushless diesel generator dc series motor has high efficiency,energy feedback is good,starting torque and overload ability general,defect is need to change the carbon brush,high speed has the ring of fire,not suitable for high speed operation,efficiency,large volume,moderate protective ability is poor,mainly used in electric tricycle.

Ac motor,the advantage is simple structure,high reliability of motor itself,the disadvantage is that starting torque is small,large starting current,motor depends on increasing the starting current to produce a large torque,but due to the battery characteristics,the battery provides large current,affects the motor torque,the motor efficiency is low,the control of complex,energy feedback performance is poor.Switched reluctance motor: advantage is in low speed with large torque,defect is low speed vibration,noise,low efficiency,poor energy feedback,rarely used.Permanent magnet synchronous motor,the advantage is with high efficiency,energy feedback acmotortrading.blogspot.com is good,the disadvantage is that when the low speed torque cannot ascend,lose the step problem,rarely used.

Brushless dc motor: advantages are: (1) motor external characteristic is good,very accord with the load characteristics of electric vehicles especially motor has low speed high torque characteristics of the precious,can provide large starting torque,satisfy the requirement of the vehicle acceleration.(2) the wide speed range,the motor can run tall in the low speed range,due to mechanical commutator and brush motor,the motor can run under low.(3) motor with high efficiency,especially under the light load cars,motor can still keep high efficiency,it is very important for precious battery power.(4) overload capacity is strong,this kind of motor than Y series motor overload capacity can be improved more than 2 times,can meet the needs of the vehicle bumps blocked.(5) regenerative braking effect is single phase generator good,because of the permanent IE2/IE3 electric motor magnetic motor rotor has the very high,when the car downhill or brake motor generator can be completely into the state,to recharge the battery,the electric braking effect at the same time,reduce the financial burden on mechanical brake.

6.Motor small volume,light weight,high power,can effectively reduce weight,save a space.7 no mechanical commutator motor,USES the totally enclosed structure,prevent dust from entering the motor internal,high reliability.Simple than asynchronous motor was motor control system.Faults is more complicated than the ac motor motor itself,brushless dc motor controller than there are complex.

Stepper motor frequency control of motor speed

Although the stepper motor with strong ability,high precision,rapid start-up speed the characteristics of easy to control,but in the actual operation process due to improper start and stop control,select the appropriate size three-phase asynchronous motor power still started shaking and stops the phenomenon of overshoot,from surface affect the control precision of the system.Especially the work in the frequent start and stop a step motor,this kind of phenomenon is more obvious [2].This paper proposes a kind of stepping motor based on single chip microcomputer control discrete acceleration and deceleration control method.Ordinate is frequency f,the unit for pulse/SEC or

step/SEC.Abscissa time t,www.dongfeng-

motor.comthe unit is in seconds.Stepper motor to f0 accelerate starts to run time t1 the highest frequency f,and then run at a constant speed,to t2 time began to slow,in t5 moment motor

stalling,the total number of N.The motor from static accelerated to the highest operating frequency

and the highest operating frequency to stop to the is the key to the stepper motor control,usually

adopt uniform acceleration and deceleration mode.

Deceleration control of stepping motor by single chip microcomputer,in fact is to change the output pulse interval,software and hardware can be used two ways.Software methods rely on delay program to change the frequency of the pulse output,ac synchronous motor of which the length of the delay is dynamic,and the method because of the need to constantly produce control pulse,occupies a large amount of CPU time; Hardware methods depend on single chip microcomputer internal timer to achieve,after each into the timer interrupt,change the time constant of timer (load),a two-dimensional table as a controlled object by stepping motor drives the ball screw in the

X/Y direction linkage.This paper discusses a kind of a circular trajectory with minimal parameters of interpolation method and the method of step motor frequency control of motor speed.Stepping motor control system of the development of the hardware and software collaborative simulation method was adopted,the system development cycle and cost can be centrifugal pump greatly reduced by acc when the pulse frequency

increases gradually,slows down the pulse frequency decreases.How to identify qualified factory motor? This method takes up less CPU time,it is a kind of high efficiency of stepping motor speed control method.Considering the single chip microcomputer resources (word length) and programming is convenient,the timer does not need to be calculated every step loading value.As shown in figure 3,using the discrete method to deceleration curve discretization.Rising speed is points after discretization steps,and every rise a step in the steps to keep for a period of time,to overcome the stepper motor rotor velocity lag caused by the moment of inertia.Only when the actual speed reaches preset to accelerating,actually also automatically correct local velocity error.

6 kv motor insulation to reduce fault handling

Fault handling Although there are damage inspection found that bar insulation,but winding wire

itself is not affected.So we try to adopt a new method for processing,insulating layer with teflon

insulation bags,namely use insulation partition way on the electric motor cooling fan basis of the original winding wire rods to strengthen its insulation capability.Specific operation,the motor to overhaul,disintegration,and high pressure fan with bamboo knife of compressed air to motor winding and iron core of the dust cleared,the breakdown point and all loose clearance winding wire rods,with at least double (single withstand voltage 2000 v) teflon insulation tape winding,with bamboo slot wedge pressure,and then filled with resin,dry.All slot wedge update or upset,make the slot wedge,wire rods are stationary,able to withstand motor starting,running huge electric power.Processing has been completed,to direct current withstand voltage test of the motor again,when the step up to 5000 v,instrument and the "breakdown" signal,review found that motor used in 50 lead was copper core rubber line wholesalemotor.blogspot.com breakdown.Originally because motor operating environment temperature is higher,and the circulating water station in the original design,the motor selection using natural air cooling,according to the arrangement of design room,adjacent to the center line of the two motors from 3.0 m,running a motor cooling wind,is just another motor cooling air into the wind,because of the close,the motor often run in more than 40 degrees Celsius temperature environment,accelerate the rubber insulation aging,make

the rotor balancing machine shorten service life.The processing of wire insulation to strengthen on the motor.Lead to motor clean with gasoline,white cloth,and then using 6 kv with heat insulation tube heat insulation,all dc withstand voltage test was carried out on the motor after processed,the result completely conform to the requirements of the regulations.Equipment is working well so far.