Motor development history

Motor development www.dongfeng-motor.com history In 1835,produced the world's first can drive small traction motor of the application of a blacksmith in the United States of Wen Bo (Thomas Davenport).In the early 1870 s,the world's first commercial motor by the Belgian electrical engineer Zenobe Theophile Gamme invention.In 1888,a famous American inventor nikola tesla used Faraday electromagnetic induction principle,ac motor,the invention is the induction motor.In small electric motors 1845,British physicist,hui tu (Wheatstone) to apply for the patent of the linear motor,but the principle in the 1960 s were seriously,designed the practical linear motor,the current has been widely applied in wholesalemotor.blogspot.com industry.In 1902,the Swedish engineer Dan nelson use tesla of stator a rotating magnetic field induction motor,synchronous motor was invented.In 1923,the Scot James Weir French invented type three-phase Variable reluctance (Variable reluctance) stepper motor.In 1962,through the help of hall element,a practical DC brushless motor has finally come out.In the 1980 s,the utility of ultrasound motor begins to come out.

When using the motor must pay attention to the problem?

Should you make before putting on electricity to run the following checks:1) the power supply voltage is appropriate (overvoltage is likely to cause the damage to the driver module);For input dc + / - polarity must not wrong,drive the motor model or current setting of the controller is appropriate (at the beginning of not too big);2) strong control signal lines,industrial site best shield to electricalmotor1.blogspot.com consider,such as using twisted pair);3) don't start in all of the need to connect the line,only together as the most basic system,after running well,and then gradually connection.4) must be clear grounding method,or is not empty.5) start running half an hour to closely observe the state of the motor,such as ac alternators 220vmovement is normal,voice and temperature rise,found the problem immediately stop adjustment.7,the stepper motor is up and running,sometimes move don't move or in situ to reverse,runtime sometimes out of step,what's the problem? 

Make check general to consider the following aspects:1) whether the motor torque is enough big,can drive the load,so we usually recommend the user selection to choose moment when 50%~100% larger than the actual need of motor,step motor cannot load running,even a moment,can cause Out of step,serious when a halt or irregular back again and again.2) host controller to input your step pulse current is big enough (> 10 generalnma),so that the optical coupling and stable conduction,the frequency of the input is too high,lead to receive less than,if the upper controller output circuit is CMOS circuit, Also want to choose CMOS input type of drives.3) whether the start frequency is too high,is set to accelerate the process in the launcher,the best from the start of the motor regulation within the frequency began to accelerate to the set frequency,even if the acceleration time is very short,otherwise may be unstable,even in the idle state.gasoline generator spare parts4) when the motor is fixed,and sometimes this could be happening,belong to normal. Because,in fact,this caused the motor's strong resonance caused by the state of out of step. Motor must be fixed. 5) for 5 phase motor phase A wrong motor cannot work.

The classification of the electromagnetic interference source (disturbance)

Electromagnetic interference,there are many kinds of classification methods,for example,according to the route of transmission,can be divided into the conducted interference and the radiated interference,the conducted interference transmission properties of the electric coupling,magnetic coupling and electromagnetic coupling;According to the transmission properties of radiated interference,can be divided into the near-zone induction coupling and far ground radiation coupling;According to 12v motor the band,can be divided into narrowband and broadband:According to the interference frequency range,and can be subdivided into five kinds of l (table 1);According to the subjective intention of implementation of the intruder,can be divided into intentional interference and has no intention of interference;According to the nature of the interference sources,can be divided into natural interference and man-made interference (figure l - 1),etc.Mainly discuss under the natural disturbance (disturbance) and human disturbance (harassment).1.Natural disturbance.Natural electromagnetic interference sources exist in the earth and the universe,the natural electromagnetic phenomenon produces electromagnetic noise.

The electromagnetic noise generated by the nature of the electromagnetic phenomenon,typically include:(1) atmospheric noise,such as lightning;(2) the sun noise,sunspot activity during geomagnetic storm;(3) NingZhou noise,from the Milky Way;(4) electrostatic discharge (ESI)).2.Human disturbance.Human disturbance from intends to launch interference sources and has no intention of interference sources.Intends to launch the interference source is dedicated to radiate electromagnetic energy equipment,for example,radio,television,communications,radar,navigation,such as transmitting equipment,is a space launch to useful signal of electromagnetic energy to work,they don't require these signals to the electronic system or equipment will form functional disturbance,and is an important single phase induction motor pollution source of electromagnetic environment.There are many devices are unconsciously emission electromagnetic energy,for example,automobile ignition system,different kinds of power device and the device of the motor,lighting,strobe lights advertising,high voltage power line,industrial,scientific and medical didn't prepared,and the receiver local oscillation are unconsciously electromagnetic energy emitted radiation,etc.The launch could be to space radiation,can also be along the conductor conducted emission,electromagnetic energy is emitted by random or regular,generally has a very wide band or discrete spectrum,the power can be emitted from leather tile to mw order of magnitude.

Any electrical and electronic equipment could cause artificial harassment,list some prone to harassment of the equipment.(1) household appliances and and civilian equipment:(1) contact electrical appliances,such as refrigerators,electric iron,electromagnetic switch,relay,etc.(2) use the commutator motor equipment such as electric drill,vacuum cleaners,electric mixer,dental medical equipment,etc.(3) household electric power semiconductor devices,such as silicon rectifier dimmers,switching power supply,etc.(2) the high frequency equipment:(1) high frequency equipment used in industry,such as plastic welder,high frequency welding machine,high frequency heater,etc.(2) high frequency medical equipment,such as VHF and uhf physical therapy device,high frequency knife,electric measuring instrument,etc.

(3) power equipment:(1) power 6v electric motor transmission equipment,such as pay (straight) flow servo motor,stepping motor,solenoid valve,contactor,etc.(2) converter device of power electronic devices,such as controllable rectifier,inverter,inverter,ac voltage regulator,UPs power supply,etc.(3) power transmission equipment,such as high voltage power transmission lines,high voltage circuit breaker,transformer,etc.(4) electrified railway,such as electric locomotive,catenary,etc.(4) the internal combustion engine,including the ignition system,generator,voltage regulator,brush,etc.(5) the radio transmitting and electricalmotor1.blogspot.com receiving devices,including mobile communication system,radio,television,radar,navigation equipment,etc.(6) high speed digital circuit equipment:including computer and related equipment.Various interference

sources may be periodic,its frequency range can be from 0 Hz to tens of thousands of Hector,a few MHZ or even several GHZ or higher.The jamming signal may also is cyclical or pulse form.Energy can also be very weak or megawatt.

Stepper motor

Stepper motor no-load start frequency,often referred to as "empty frequency".This is to choose an indicator of step motor is more important.If required frequent start,stop,in a flash,and the speed at 1000 r/min or so (or higher),usually need to "accelerate the start".Directly if you need to start the high-speed operation,had better choose asynchronous motor reactive or permanent magnet stepper motor.The step motor "empty frequency" are high.Keep the torque stepper motor,similar to the "power" referred to in the traditional motor.Of course,the distinction that having essence.Physical structure of step motor,is completely different from ac,dc motor,the output power of the stepper motor is variable.Series three phase asynchronous motor no-load start frequency,often referred to www.facebook.com/guohong.trading as "empty frequency".This is to choose an indicator stator of step motor is more important.If required frequent start,stop,in a flash,and the speed at 1000 r/min or so (or higher),usually need to "accelerate the start".Directly if you need to start the high-speed operation,had better choose reactive or permanent magnet stepper motor.The step motor "empty frequency" are high.

Methods for searching the artificial

If not installed within substation grounding line selection device,also is not installed on line

grounding fault indicator or short circuit in one fault indicator,also does not have good grounding fault detector,it had to adopt artificial find stupid way.To find the steps as follows:(1) by hand (or scheduling,same below) switch,in order to know which article for grounding transformer

substation,by www.facebook.com/guohong.trading scheduling which to know.2 there are two ways to find the next point of failure: one is cascade line segments,or will often have a fault line,with 2.5 kV shaking table test grounding relatively insulation,insulation resistance small during the fault period,reduce search range (of course,in the transformer substation outlet side must be hanging safety protection measures such as grounding line);The second is the line segment as far as possible,and then try step by step and sending,and scheduling stator winding machine

interactive coordination,with zero sequence voltage alarm when the segment for fault section.Methods for searching the artificial operation very troublesome,if the line length,branch number,switch section,that is not good operation,coupled with the sky and the weather,that would be much bad treatment.Suggest or some less investment in equipment technology is used to cooperate with artificial search,can get ac alternators 220vtwice the result with half the effort,both provides the power supply reliability and the social efficiency,also created economic benefits.

How do you determine the stepper motor driver dc power supply?

12.How do you determine the stepper motor driver dc power supply?A.determine the voltage of the hybrid stepping motor drive power supply voltage is usually A wide range (e.g.,the power supply voltage IM483 for 12 ~ 48 VDC),the power supply voltage is usually according to the requirements of the machine work speed and response to choose.If the motor working speed is higher Or response requires faster,so the voltage value is high,but pay attention to the power supply voltage ripple cannot exceed drives the input voltage,otherwise may damage the drives.B.determination of current power supply current is generally according to the output current (I) to determine the drive.If the linear single phase induction motorpower supply,power supply electric current generally desirable I 1.1 ~ 1.3 times; If the switch power supply,power supply current generally desirable I 1.5 ~ 2.0 times.induction motor sales 13.Hybrid stepping motor drives the offline signal FREE generally used under what circumstances?When FREE for off-line signal low electricity at ordinary times,drive the output to the motor current is cut off,The motor rotor in the free state (offline).In some automation equipment,if the drive continuous electric power requirement direct drive motor shaft (manually),Low signal,it can be FREE offline,make motor for manual operation or adjustment.After done manually,then FREE signal is high,to continue to automatic

control.14.If the adjustment electricalmotor1.blogspot.com in a simple way,two phase stepping motor rotation direction after the power supply?Just put the motor and drive wiring A+and A-(or B+and B -) switch

General electrical engineer to summarize the influence of frequency converter for motor

1 the efficiency of the motor and the problem of temperature rise In either in the form of a frequency converter, both in the operation of the different degree of harmonic voltage and current, make the motor in non-sinusoidal voltage, power flow operation. At the current widespread use of sine wave type PWM inverter as an example, the basic is zero, the low-order harmonic larger than the rest of the 220v electric motor carrier frequency times the left and right sides of higher harmonic components as: 2 u + 1 (u for modulation ratio). Can lead to higher harmonic motor stator copper loss, rotor copper loss, iron loss and the increase of the additional loss, the most significant is the rotor copper loss; For asynchronous motor is close to the base wave frequency corresponds to the synchronous speed of rotation, therefore, higher harmonic voltage to a larger slip cutting rotor after conducting bar, will produce very big rotor loss; In addition, also should be considered because of skin effect produced by the additional copper loss. These losses will make motor extra heat, low efficiency, output power decreases, and such as ordinary motor running in the inverter output non-sinusoidal power supply conditions, the general temperature will increase 10% to 20%. 2 motor insulation strength problem At present middle and small converter, many are using the PWM control mode.

 It's about several thousand to more than 10 KHZ carrier frequency, which makes the motor stator winding to withstand high voltage build-up rate, equivalent to impose great impulse voltage gradient on motor, the motor of the turn-to-turn insulation withstand more ordeal. In addition, the rectangular produced by PWM inverter chopper superposition of impulse voltage on the motor operating voltage, which not only high peak and the high frequency impulse voltage, would pose a threat to the electric motor 12v 500w insulation of the motor, to ground insulation under the repeated impact of high pressure can accelerate ageing. 3 harmonic electromagnetic noise and vibration Ordinary motor using frequency inverter power supply, can make the electromagnetic, mechanical, ventilation and other factors caused by the vibration and noise becomes more complicated. Frequency conversion power harmonic and motor electromagnetic part contains all of the time the inherent space harmonic interference each other and form all kinds of electromagnetic vibration force. When the electromagnetic wave frequency and motor of the body's natural vibration frequency is consistent or close to, will produce resonance phenomenon, so as to increase the noise. Due to the motor operating frequency range wide, wide speed change range, all kinds of the electromagnetic wave frequency is difficult to avoid the components of the motor of the inherent vibration frequency.

 Four shaft voltage increase Shaft voltage refers ac motor to two axes voltage or voltage between shaft and shaft, for motor frequency conversion power supply, usually on each phase voltage on the motor is balanced, however, because each phase rectifier components and control components differences in features, may be a momentary voltage imbalance, produced in the shaft larger shaft voltage; Combined with the harmonic voltage on the rotor will be bearing oil film as medium to form a earth capacitance, producing a capacitive current; The current flows through the oil film between shaft and bush, if critical lubrication condition, the oil film will be destroyed, there will be a large current flows through the oil film, thus shortening bearing alloy, bearing life or damage to the accident. 5 motor for frequent starting and braking ability to adapt As a result of the inverter power supply, motor can under low frequency and voltage start, in the form of no impact current and frequency converter is available for braking modes of the brake quickly, create conditions for the realization of the frequent starting and braking, and the mechanical system and electromagnetic system of the motor is in circulation under the action of alternating force, brings to the mechanical structure and insulation structure fatigue and accelerated aging problem. 6 low-speed cooling problems First of all, the impedance of the asynchronous motor is not ideal, when power frequency is low, the power loss caused by high order harmonic. Second, general motors in speed decreases, current and magnetic flux basic keep inconvenience, but the cooling air volume and speed of three proportional to reduce, cause the low speed of a motor cooling conditions deteriorate, a sharp increase in temperature is difficult to realize the constant torque output. General electrical engineer pointed out that, in view of the above issues ahead of protective 8500w gasoline generator measures to prolong the service life of click.