Servo motor cable to relieve stress

 Electric Motors 1 HP 3PH
Specifications
1. Shape: squirrel cage
2. CE.ISO CCC 
3. Side Terminal Box 
4. Free Foot Mounting 
5. 100% copper wire 
A: to ensure that the cable is not because of external bending force or under vertical load torque or its spare parts weight, especially in the cable or joint at the exit. B: in the case of a servo motor to move, should put cable (that water pump price is, with the motor configuration) is firmly fixed diesel magnetic generator single phase motor generator to a stationary part (motor), and small diesel engine should use an additional cable installed in synchronous generator the cable support to prolong it, so www.dongfeng-motor.com that the ac induction motor bending stress can be reduced to a minimum. C: the diesel generator set bend radius of the cable to be as large as possible.

Master electrical troubleshooting method 2

ac three phase asynchronous electric motor stator 

Specifications
1. 20 years manufacturing experience 

2. competitive price,high quality 
Faults exclusion is an important work of maintenance personnel, to eliminate the fault, must know the cause of the failure, more important is can theoretically analysis, solve the fault occurred, should have certain professional theory knowledge, to master the methods of troubleshooting. (a) current test method: test method is usually in the measurement circuit current conformed to the normal, a method to determine the cause of the electrical motor 12v 1000w problem. For low voltage circuit, often use the ammeter or multimeter current file concatenated in circuit to measure; For high voltage circuit, often using clip-on ammeter test. (2) the instrument test method: with the aid of all kinds of instruments to measure ac electric motor various parameters, such as using oscilloscope to observe the waveform and the change of the parameters, in order to analysis the cause of the failure, much used in low voltage circuit. 


Y2 series 0.75kW (1HP) AC Motor for Speed Control
Specifications
1. effiency: IE2 and IE1 
2. 20 years manufacturing experience 
3. 12 months guarantee 

4. low noise and vibtration 
(3) the conventional method: rely on human sense organs (such as: some burning in the electrical equipment in use, the smell of burnt food lighter, discharge phenomenon, etc.) and with the aid of ~ simple instruments (e.g. multimeter) to find the cause of the problem. This method is the most commonly used in maintenance, is also used in the first place. (4) to replace the original accessories: in doubt a device or circuit board is faulty, but not sure, and there are alternative parts, alternative test, to see whether the fault disappear, returned to normal. (5) electricalmotor1.blogspot.com direct method: to understand in the cause of the problem or according to the experience, judge the location of the failure, can be directly check suspect point of failure.

Positive pressure type motor

electric motor stator rotor lamination motor parts 

Specifications
1. Lamination of electric motor 
2. IP54 class F 
3. 100% copper 
4. silicon steel stamping 

5.stunning performance
 It's a type of positive pressure type electrical equipment. The electric motor 12v 500w structure features are: (1) have a full configuration of ventilation system, the motor internal may affect the structure of the ventilation blind Angle. (2) shell and tube made of noncombustible wholesalemotor.blogspot.com materials, and has enough mechanical strength. (3) within the shell and the main relative to the outside world keep enough positive pressure air. (4) the motor must have a safety device (e.g., time relay and flow monitor), to ensure adequate ventilation, also must have the shell pressure under voltage automatic protection and alarm device. (5) ac motor quick open the door or cover shall be on shell with power interlock device. In China there is no unified positive pressure type electric motor motor series products.

Three-phase asynchronous motor current sampling hardware circuit

Stator Motors Rotor 

Specifications
1. 20 years manufacturing experience 
2. competitive price,high quality 

3. Brand Name: FUJIAN DONGFENG MACHINERY ELECTRICAL LIABILITY CO., LTD

Current sampling hardware circuit as shown in figure 5, three-phase asynchronous motor current sampling resistance R7_1 for 3 m - liuyunqian @ yeah - embedded learning sampling resistor, take its at the ends of the voltage input 7860, to 7860 MC7805 input A steady supply of 5 v power supply, R9 and C4 RC low-pass filter, through A/D conversion isolation output frequency modulation for 10 MHZ clock and A data flow, by the transformation of the interface chip 0872 processing, signal output CS, SDAT and SCLK motor spare parts road, access to the SPI interface of DSP, read 15 digital quantity. HCPL27840 chip is agilent an isolation amplifier, it has superior performance, like the CMRR, offset voltage, nonlinearity, working temperature range and voltage have strict index, etc. Disorder of low offset voltage and low temperature coefficient allows precise generator set spare parts use of automatic calibration technology. Tolerance of the gain of 5% and 0.1% of linearity, provides accurate feedback and control further performance requirements. 


Y2 series electric motor wholesale

Specifications
1. effiency: IE2 and IE1 
2. 20 years manufacturing experience 
3. 12 months guarantee 
4. low noise and vibtration 

5. AC Voltage: 220V/380V, 380V/660V,400V/690V,220V/400V

Wide temperature range allows HCPL7840 to be applied to all kinds of bad working environment. HCPL - 7840 consists of A three-phase asynchronous motor current sampling resistance - liuyunqian @ yeah - embedded learning A/D converter, also match have A D/A converter, the principle as shown in figure 7, input electricalmotor1.blogspot.com dc signal through the three-phase asynchronous motor current sampling resistance - liuyunqian @ yeah - embedded learning modulator to the encoder quantization and coding, under the clock signal control, in the form of digital string passed to the light emitting diode, drive leds light. Due to the current strength is different, have different luminous intensity, the demodulation side has A photocell will detect the change, will receive the light signal into electrical signal, and then sent to the decoder and D/A AC synchronous generator converters back into analog signals, after filtering the output. Jamming signals due to the current weak enough to drive leds luminous, and therefore there is no corresponding electrical signal output on demodulation, thus suppressed. So on the output side get effective dc signal is magnified.

A direct torque control system

 The characteristics of the direct torque control is to control the stator flux linkage, is directly under the stator static coordinate system, with space vector concept, by detecting the stator voltage, current, direct calculation under the stator coordinate and control the flux linkage and torque of the motor, torque, high dynamic performance. It does not require the ac motor into equivalent dc motor, and thus eliminate the vector transformation of many complex calculations, it does not need to imitate the ac motor capacitor dc motor control, and thus do not need for decoupling and simplify the mathematical model of ac motor, and just care about the size of the electromagnetic torque and so on in addition to the stator resistance of all control motor parameters change good robustness, the stator flux observer is introduced by magnetic chain model can easily, and conveniently estimate the synchronous speed information, at the same time is also very easy to get torque model, flux model and torque model would constitute the complete motor model, and thus can easily achieve speed spare parts sensorless control, if again set the speed regulator in the system, can be further high-performance dynamic torque control. 

To be sure, the direct torque control inverter with different switching device, control method is also different. Depenbrock initially proposed directly from the control theory, mainly in the high voltage, high power and low switching frequency inverters are widely used in the control. Current control method is applied to general inverter is a kind of improvement, suitable for high switching frequency inverters. ABB company first launched in 1995 ACS600 series general inverter direct torque control system, the dynamic torque response speed has reached < 2 ms, when the belt speed sensor PG 0.001% rate of static accuracy of soil, in the case of without speed sensor PG even affected by the change of the input voltage or load mutation, also can be plus or minus 0.1% of the speed control accuracy. Other companies also is trying to target with direct torque control, such as Fuji company FRENIC5000VG7S series high performance electricalmotor1.blogspot.com speed sensorless vector control of general frequency converter, with direct torque control method and difference, but it also has to do the speed control accuracy + / - 0.005%, 100 hz and 800 hz current response speed response and torque control accuracy + / - 3% (PG). Other companies such as Japan's mitsubishi, Hitachi, the latest series of products such as Finland VASON speed sensorless control of similar design, performance have further improved.

Wound rotor asynchronous motor rotor series resistance speed control method

Wound rotor asynchronous motor rotor string into the additional resistance,make the slip of the

motor,motor under low single phase asynchronous motor speed running.The series resistance,the greater the lower the speed of 5kw permanent magnet generator the electric motors price motor.This method is simple,easy to control,but the slip power consumption in acmotortrading.blogspot.com the form of heat on the resistance.Step speed,mechanical properties of soft.

Hot summer, the motor running problems should be paid attention to

In the operation of the motor in the hot summer work should pay attention to the following: 1, monitoring the power supply voltage change in voltage should not be more than or less than 10% of the rated voltage range, if lower than this range, should be appropriately reduced load operation. At the same time, the three-phase voltage imbalance also cannot too much. The difference of any two phase voltage should not exceed 5%, otherwise will make motor fever too fast. Motor power are best a voltmeter and switch directly to monitor. 2, monitors the running motor current Under normal circumstances operation shall not exceed the nameplate rating. Also should pay attention to whether the three phase current balance and any two interphase current difference should not be more than 10% of the rated current, otherwise the motor has a fault. Particular attention to whether there is a lack of phase operation. Shall furnish ammeter monitoring of large capacity motor running current, capacity should also be smaller motor line current is measured with a clip-on ammeter at any time. 3, monitoring the temperature of the motor The temperature rise shall not exceed allow the limits of the motor nameplate. In operation of the motor temperature rise is monitoring the motor running condition of direct and reliable way. Check the temperature rise method can refer to the 144 q. Online road furnish voltmeter, ammeter, and overload protection device, also is Motor vehicle the main way to monitor the temperature rise. 4, monitor the motor running in induction motor price the noise, vibration and smell when the motor running, voice even, smooth operation, insulating paint smell and the smell. In case of abnormal noise, vibration, insulating paint smell, etc., that motor overheating or other failures. 5, surveillance gear work To watch if there's any loose for pulley or coupling, transmission belt with and without sliding phenomenon (sliding belt is too loose), belt joint are in good condition. 6, monitor the condition of the bearing Pay attention to the bearing noise and fever. When using a thermometer to measure, rolling bearing heating temperature not over 95 ℃, sliding bearing heating temperature not over 80 ℃. Bearing abnormal sound or overheating, is poor lubrication bearing, wear and tear caused by severe. 7, monitor the condition of the fuse Should always pay attention to whether there is a photograph of blown fuse, lest cause lack of phase operation make the motor overheating. In a word, the motor in the process of running, monitoring the current, the change of temperature, found problems in a timely manner.

Three-phase motor open phase protection and current changes

Its working principle: Combination switch Q closed first, prepare for motor starting. The main circuit and control circuit and electricity, connect to A, C and two ac contactor coil KM2 electricity, iron core is sucked, concatenated in ac contactor KM1 normally open contacts closed KM2. When press the starting button SB2, ac contactor KM1 electric suction, main circuit of the three main contact closure, auxiliary contact since locking, starting motor M. When there is lack of phase motor, if the lack of A phase or C phase, ac contactor coil KM2, losing electricity concatenated in ac contactor coil KM1 contact KM2 disconnect, make the ac contactor coil KM1 lost electricity, so the lock off contact, the contact is disconnected, the motor can't start losing electricity (right now) or stop; If lack of phase B, ac contactor coil KM1 losing electricity, the lock off contact, main contact disconnect, motor power, can't start (right now) or stop the operation. Thus ensure the motor in diesel generating set the circuit of phase is not 8500w gasoline generator destroyed.