The inverter no-load current is greater than the load current

 115/120 V AC Voltage and Three-phase Phase small 240v electric motor
Specifications
1.Specifications1.3-phase asynchronous motors 
2.IEC standard 
3.OEM 
4.Voltage:50HZ &60HZ;380V&415V 
5.Protection class: IP54 
A 75 kw micro can WIN - G9 inverter commissioning the strange phenomenon Cause: a cement plant users to send a 75 kw can WIN - G9 frequency converter, the cause of the problem is, in the operation of the fire smoke in the inverter, the inverter downtime. Check, the power input circuit of the machine for three phase half controlled bridge, using the principle of controlled rectifier, on the main loop of the dc energy storage capacitor "soft power" and save the small power inverter commonly used rechargeable contactor. In fact half controlled bridge in this here is equivalent to non-contact soft blunt electricity switch. Inspection found that one of the thyristor module electrical motor 12v 1000w terminals have obvious signs of flashover arc burning, but the measurement is not short circuit. Found in the disassembly easily fixed nut landed, flashover reason seems to be a connecting screw loose, causing poor contact. The module for a combination of a diode and a one-way thyristor. And then check the control panel and inverter main circuit, without exception. The module, more than two phase half controlled bridge as the ac electric motor power input, after power on, with a small power 2.2 kW three-phase motor, feel no problem, switch to the new module after a same model, then to the site for installation.

DONGFENG Brand Two Speed Motor
Specifications
1. DONGFENG Brand Two Speed Motor 
2. 3000RPM-750RPM 
3. Electrical motor 
4. factory price best quality 

5. 100% copper 
 Precaution, first will run to 5 hz frequency, frequency converter load as a fan, motor connector off first, make the motor no-load running. This trial run, got a fright! Frequency at 5 hz, no-load running current 45 a, although feel slightly larger, but consider for a possible repair, or frequency converter for motor winding parameters such as starting curve or torque compensation made adjustment caused by waiting for a reason, without notice. When up to 10 hz inverter panel shows the current and the output current is measured with clip-on table, have reached the 100 a! And the oscillation amplitude of the output current is great, but test the three-phase output voltage, about 70 v, balanced and stable. The motor cable release, electric logging on the inverter output, output frequency 10 hz, the output voltage is 70 v, 20 hz to 150 v, 35 hz to 250 v, after decreasing with frequency, to 50 hz, 400 v. In this process, the measurement of three-phase output voltage balance is very good. The inverter output of V/F curve electricalmotor1.blogspot.com accords with quadratic load torque characteristics. No problem. Output voltage balance and stability, and the output current is too large and the current volatility, obviously for the load caused by abnormal. This is lead to the conclusion of conventional judgment.

Switch control equipment

Cast Iron electrical motor auto spare parts 
Specifications
1. 20 years manufacturing experience 
2. competitive price,high quality

3. Delivery Detail:within 10 days after receiving deposit 
In computer network system, the concept of exchange is the improvement of the Shared work patterns. Have we been introduced before the HUB of the HUB is A Shared equipment, the HUB itself does not recognize the destination address, host A to magnet generator host B when the same local area network data transmission, data packets in with the architecture of the HUB is broadcast on the network mode of transmission, by every one terminal via validation data in baotou address information to determine whether to accept. That is to say, in this way of working, the same time can only transmit a set of data frames on the network of communication, if a collision have to try again. This way is Shared network bandwidth. Switches have a very high bandwidth of the back of the bus and internal exchange matrix. 


OEM industrial electric motors
Specifications
1. effiency: IE2 and IE1 
2. 20 years manufacturing experience 
3. 12 months guarantee 

4. low noise and vibtration
All switch ports are articulated in the back on the bus, the control circuit receives packets, deal with port looks for acmotor2.blogspot.com in memory in order to determine the destination MAC address table (network adapter hardware address) of the NIC (NIC) articulated in which port, through internal exchange matrix quickly to send the packet to the destination port, if there is no destination MAC to broadcast to all ports, exchange the opportunity to "learn" after receiving port in response to the new address, and put it in the internal address table. Using switches can also keep the network "block", through contrast address table, only allows the necessary three phase asynchronous motor network traffic through the switch. Through switches filtering and forwarding, can effectively isolate the broadcast storm, reduce the occurrence of package and the wrong package by mistake, avoid sharing conflict.

The choice of single-phase capacitor electric mechanical and electrical capacity

The choice of single-phase capacitor small electric fan motor electric mechanical and electrical capacity Most of single-phase motor capacitor,such
acmotor2.blogspot.com as washing machines,electric fans,submersible pump,small
woodworking planer,etc.But due to capacitor spoiled or improper selection capacity,Motor running temperature,noise,power consumption increases,the speed is reduced,the phenomenon such as torque decreases,here the selection of electrical and mechanical capacity of the capacitor motor approach to electricity Work friends can do a introduction,for your reference. Calculation method 1:Single-phase
capacitor electric mechanical and electrical capacity depends on the size of the deputy winding current.

Because of different sizes,single phase motor power to consider when choosing capacitance rev Dynamic torque,speed,temperature,noise and loss should be within the normal range.So first of all should from the nameplate detect single-phase motor power,calculate the primary winding of the electricity Flow,and then according to the primary winding current (0.5 0.7) times to perkins diesel generator set calculate the current value of each winding current,according to the formula C = IC * 10 divided by 2 PI fVo.The formula of the I I = P = V is obtained. 2:the selection of capacitor Single-phase capacitor motor should first choose oil-immersed capacitor,pressure value should be above 400 v.Second optional www.facebook.com/guohong.trading ac electrolytic capacitor,its small size,low prices,but life Life is a bit short.

Air switch principle

When line short-circuit or serious overload current,short circuit current instantaneous tripping over setting current value,electromagnetic trip generate ac electric motor enough suction,incorporating armature suck hit the lever,toggle hook around a shaft seat up and lock release,lock wholesalemotor.blogspot.com in reaction under the action of the spring will be three pairs of single phase asynchronous motor main contactor breaking,cut off power supply.When line general overload,overcurrent,although cannot make electromagnetic trip action,but it can make the heat element produces a certain quantity of electric motors 12 volt heat,prompting bimetallic strip heated bending upwards,push the lever to toggle hook and lock release,breaking will be the main contact,cut off power supply.

With a brush brushless

Brushless dc motor is composed of stator main body of the motor and drive, is a typical mechatronics product. The stator winding of the motor to make more balanced three-phase y connection, With three phase asynchronous motor is electrical motor 24v very similar. On the rotor of the motor with the magnetization of the permanent magnet has, in order to detect the polarity of the motor rotor, inside the motor is equipped with position sensing Device. Drive consists of power electronic devices and integrated circuit, its function is: accept the motor start, stop, brake signal, to control the start and stop of the motor Check and brake; Accept the position sensor signals and positive &negative, used to control the inverter bridge on and off of each power tube produce continuous torque; Accept the speed instruction and feedback Signal, which is used to control and adjust the speed; To provide protection and display, and so on. Because of brushless dc motor based on self-control type operation, so don't like frequency control of motor speed synchronous motor overload start under plus startup winding on the www.dongfeng-motor.com rotor, also do not When the load mutation generate oscillation and step out. Medium and small capacity of the permanent magnet brushless dc motor (BLDCM), now more than using high magnetic energy product of rare earth ndfeb material (Nd - Fe - B) Material. As a result, the volume of rare earth permanent magnet brushless motor than three-phase asynchronous motor with capacity reduces a frame number. Nearly thirty years in view of the asynchronous motor frequency control of motor speed Research, in the final analysis is looking for a way to control the asynchronous motor torque, rare earth permanent magnet brushless dc motor is bound to its wide speed range, small volume, high efficiency and steady state Speed and small error characteristics appeared in the field of speed advantage. Because of brushless dc motor has the characteristics of a dc motor, is also the electrical motor 12v 1000w device of frequency variation, so also known as straight Flow frequency conversion, the international general term for BLDC) motors running efficiency of the brushless dc motor, torque at low speed, precision of speed is more good than any of the control technology of inverter, so value Attention to the industry. The product has production more than 55 kw, can design to 400 kw, can meet the requirements of industry energy saving and high performance drive. 

1, fully replace the dc motor speed control, comprehensive alternative, comprehensive alternative to asynchronous motor frequency converter + frequency conversion motor + reducer speed; 2, can run for high power at low speed, can save the reducer direct drive big load; 3, have all the advantages of traditional dc motor, and cancelled the carbon brush and slip ring structure; 4, torque characteristic is excellent, medium and low speed torque performance is good, big start torque, small starting current; 5, stepless speed regulation, wide speed range, strong overload capacity; 6, small volume, light weight, large output; 7, soft and soft stop, good braking performance, saves the original mechanical braking or electromagnetic braking device; 8, high efficiency, no excitation loss and carbon brush motor itself loss, eliminate the multiple reduction consumption, comprehensive energy-saving rate can reach 20% ~ 60%, power saving a year only to recover Cost; 9, high reliability, good stability and strong adaptability, simple maintenance and maintenance; 10, turbulence shock resistance, low noise, little vibration, smooth operation, long service life; 11, no radio interference, does not produce sparks, especially suitable for explosive place, explosion-proof type; 12, according to the needs of optional trapezoidal wave motor and is XuanBo magnetic field magnetic field. 21 points for attention (1) before disassembly, should surface dust with compressed air blowing off the motor, and scraped perkins diesel generator set clean surface dirt. 

2 choose motor working place, the disintegration of the clean up the scene environment. (3) familiar with the motor structure characteristics and maintenance technical requirements. (4) ready to collapse the required tools and equipment (including special tools). 5] in order to further understand the defects of the motor running, conditional when can do an inspection test before disassembly. Therefore, the motor with load test, detailed inspection machine Parts, such as temperature, sound, vibration, and test the voltage, current, speed, etc., and then disconnect the load, do a no-load check test, measure and no-load current No-load loss, recorded. [6] to cut off the power supply, electrical wiring to remove, recorded. Once the appropriate voltage test motor insulation resistance by megger are. Maintenance in order to keep up with The Times when measured insulation resistance compared to judge the trend of change motor insulation and insulation State, different temperature should be measured insulation resistance value conversion to the same temperature, the average conversion to 75 ℃. Being tested to absorb than K. When the absorption ratio greater than 1.33, which indicates that the motor insulation or degree of be affected with damp be affected with damp be affected with damp be affected with damp or not serious. In order to compare with previous data, should will likewise Any temperature measured absorption than the conversion to the same temperature.

Electronic commutation motor

ECM motor in forced air furnace and in order to save electricity of the HVAC system is used more and more,because of induction motor sales the HVAC system of fan running for a long time in the daytime.In the cost efficiency of the HVAC system with ECM motor is still questionable,the cost of the repair this motor is www.facebook.com/guohong.trading almost equal to or even more than saving it.Other single-phase capacitor motor general principal deputy for the parallel operation,the main current in our actual use load range of 90 degrees or so, You can get the best performance;And series connection generally appear in one pole winding speed regulating pole change motor,when in actual use NaZhu vice around the load ac alternators 220v range Consistent set of basic Angle,unable to form a circular magnetic field.