Sealing material and structure of the current transformer

1, the seal induction motor material Now the oil-immersed capacitive current transformer the sealing surface adopt oil resistant rubber gasket. Oil resistant rubber gasket performance: compression rate is 25% to 30%, at 130 ℃ when the inflation rate was 4%, and 50 ℃ when the shrinkage rate of 2.4%. According to the statistical data of the leakage of oil caused by gasket quality accounted for about 70% of the total oil leakage rate of above. Choose qualified rubber gasket, to eliminate leakage of transformer oil has a key role, of course it needs to communicate with transformer manufacturers. 2, the structure of the seal Transformer metal expander was adopted to realize full sealed, expander oil temperature changes when the volume of the compensation effect. In order to ensure the sealing surface fully tighten, do not lead to overly compressed seal again, most parts of limit seal. But in porcelain bushing www.facebook.com/dongfeng.motor and tank, metal expander coupling seal face and a outlet seal face of flange connection. Parts from the scene found that 400v ac motor motor vehicle the leakage of oil, it is precisely the flange surface is the most easy to oil leakage. So the flange face seal assembly procedure and process is particularly important. Good flange sealing surface must be smooth sealing surface cleaning, the pressure appropriate, reliable positioning, flange surface parallel uniform.

What are the regulations on motor operation and matters needing attention?

(1) motor under the condition of rated cooling,according to the rated data stipulated in the factory brand of the running,do not allow the limitation of ambiguous motor run blindly.(2) the motor coil and iron core of maximum monitoring temperature should be according to the provisions of the factory,such as the factory did not make clear a regulation should be according to the provisions of the table below,the motor runs in any circumstance should not exceed the temperature rise.Insulation class A grade B E F,resistance thermometer resistance thermometer resistance thermometer measurement method,static son 220v electric motor winding temperature rise of the temperature rise of 506060757080,8595100110105115,static iron core temperature,607580,95100115,the above-mentioned numerical temperature when the environment temperature of 35 ℃ (3) allows the temperature of the motor bearings,should abide by the provisions of the factory.No manufacturing rules,according to the following provisions: A,for the sliding bearing,shall not exceed 80 ℃.B,for rolling bearing,shall not exceed 100 ℃ (poor quality of oils and fats,do not exceed 85 ℃) 

(4) motor can be changed at rated voltage general-5% to + 10% within the scope of operation,its rating unchanged.(5) the motor run in rating,and voltage unbalance rate shall not be greater than 5%,the difference of three phase current shall not be greater than 10%.(6) the motor is running,in each bearing measured vibration shall not exceed the provisions of the table below: motor speed vibration value (double amplitude) mm,3000 rpm0.05,1500 rpm0.085,1000 rpm0.10,750 RPM and below 0.12 Motor in the process of running in addition to the strict rules,should also pay attention to the following questions: (1) the current of the motor under normal circumstances should not exceed allowable values,the difference between the three phase current shall not be greater than 10%.(2) sound and smell: motor start capacitor during normal operation of the sound should be IE2/IE3 electric motor uniform normal,no noise;No coke smell or smoke near the motor,if found to have different sounds,measures should be taken to processing coke smell or smoke.(3) the performance of the bearing,mainly is the lubrication situation,lubricating oil is normal,the temperature is high,whether there is sundry.(4) other situations,such as cooling www.dongfeng-

motor.com water system is normal,wound rotor motor brush on the slip ring is normal

operation.

General provisions of small thermal power plant generator excitation system?

1,the local thermal power plants should be according to the unit type exciter equipped standby armature or rectifier excitation device of spare parts.2,on the same commutator or slip

rings,especially on the same polarity,should use the same brand of brush.Brush in the brush frame should be able to free up and down (general gap of 0.1~0.2 mm).3,the generator should be equipped with forced excitation device and automatic adjusting excitation gasoline generator parts device.(including stopping and starting) in normal operation of the device must be input.4,in addition to automatic excitation regulator,in the excitation circuit of dc exciter,shall also have the manual adjusting excitation electrical and mechanical pressure field rheostat.

On the rheostat,equivalent to a generator no-load rotor and stator and rated conditions,should be in the red line.In the manual rheostat mechanical transmission device,also should be on the same token.In addition,in the mechanical transmission device,should draw arrows,pointed out that the direction of ac geared motor the mechanical transmission device rotation when enhanced excitation.All within the same power plant generators of this rotation,should be consistent.5,the generator should be equipped with automatic field suppression device (except brushless excitation system),and should be under the condition of the rotor winding insulation allowed by the overvoltage drop-out as soon as possible.

The working principle of the three-phase asynchronous motor

Working principle of the three-phase asynchronous motor is as follows:Symmetrical three phase winding ventilation with symmetrical three phase current,to produce a rotating magnetic field,magnetic field line cutting rotor winding,according to the principle of electromagnetic induction,rotor winding of e and I,rotor winding by the effect of electromagnetic force in the magnetic field,electromagnetic torque,which make the rotor rotation,the rotor output mechanical energy,drive the mechanical load.The rotor asynchronous motor rotating speed n < p > Say again synchronous motor below:Synchronous motor as a generator running,the rotor winding with dc excitation at work,by external mechanical force to drive the rotor rotation,the direction of the n0 and torque T direction on the contrary,the stator of the induced emf (electromagnetic induction principle),and then the output voltage.Run-time synchronous motor for motor,rotor electricalmotor1.blogspot.com winding with dc excitation at work,the stator three phase alternating current (ac),to produce a rotating magnetic field,drive the rotor synchronous rotation.Widely used three-phase asynchronous motor,but after running through a long time,can produce all kinds of fault,www.facebook.com/guohong.trading determine the cause of the problem in time,the corresponding processing,is to prevent failure,ensure the normal operation of equipment is an important work.Additional information:Generator in the form of a lot of,but its working principle is motor lamination based on the law of electromagnetic induction and electromagnetic force law.Therefore,the construction of the general principle is: use the appropriate magnetic and conductive material electromagnetic induction of the magnetic circuit and electric circuit with each other,to produce electromagnetic power,achieve the goal of energy conversion.

Stepper motor internal structure and working principle

Real-time monitor the running status of the safety and control of the whole system is very

important,TMC428 provide stateful inspection function.Each processor to send packets to TMC428,TMC428 returns the data to the microprocessor.Most of the motor drive circuit with a serial port are provided with different state (not work,work,etc.) and error sign (short circuit,open circuit,the high temperature).Such,TMC428 can at any time to provide the movement parameters and working mode of motor current and status.From the motor driver Daisy chain back to the TMC428 packet is 48 bits long.TMC428 put it in two 24 bit register.In this way,the microprocessor can directly read the information in the register.Combining TMC428 and TMC236 stepper motor drive control system.TMC236

internal integration HVCMOSFET constitute the complete bridge driving circuit,it adopts constant

current chopper drive way to drive the bipolar two-phase stepper electric vehicle motor motor,and has the characteristics of low power consumption,high efficiency.As shown in figure 3 is three TMC236 3 shaft,motor drive and the TMC428 control principle diagram.Using special of step motor motion controller and driver circuit system with peripheral circuit is simple,strong anti-jamming capability and high reliability etc,can reduce the development cost control circuit.The whole system in addition to the power supply only five IC,therefore,small volume,simple control,particularly applicable to 3 axis when step motor driver.Experiment proved that the control of step motor drive high positioning accuracy,plus,deceleration performance is good,at the same time,the start-stop,inversion is also very good performance.

TMC428 is made up of each unit regispumpster and on-chip RAM.Its internal including

two external serial interface,waveform generator and the pulse generator,micro step unit,multi-port

RAM controller and the interrupt controller.TMC428 generally from the microprocessor control

instruction,the microprocessor is through the sending and receiving fixed length packet of TMC428

registers and RAM to read and write operations.TMC428 register and the function of the on-chip RAM is different.Registers are used to store the overall motor configuration parameters and motion

parameters,and on chip RAM to store the drive serial interface configuration and micro step

table.Refers to the drive motor the population parameter TMC236 in Daisy chain configuration.Motion parameters including the current position of the motor,target location,maximum speed,maximum

acceleration,current ratio,waveform generator and generator parameters,and subdivide microstep resolution,etc.On chip RAM including 64 addresses the data space,each address data can be stored 24 bits wide,before a 32-bit address data is to drive Daisy chain configuration of serial communication

data wholesalemotor.blogspot.com

packets,the 32-bit address data for micro step subdivision table.Drive the serial interface is the

communication interface between TMC428 and Daisy chain drive.From TMC428 to drive between the length of the serial data packet is configurable,so as to adapt to the different types and manufacturers of circuit composed of SPI ring structure,the maximum length of data for 64 - bit.After initialization,TMC428 and stepper motor drives the communication between the is done automatically.Different types of drives can be mixed with SPI interface connection with TMC428 constitute a Daisy chain structure.TMC428 with most manufacturers of stepper motor driver circuit compatible.

It can be directly connected with SPI mouth stepper motor drive,also be able to connect additional devices commonly used parallel port driver.Even with a step,direction of input of stepper motor driver can also by TMC428 control.TMC236 stepper motor drive circuit is very simple to connect

into serial Daisy chain structure,using the TMC428 3 axis stepper motor control system can play a

better TMC428 control characteristics.After the initialization,TMC428 can automatically send packets

to each TMC236 Daisy chain,that is to say,the driver serial interface after initialization can work automatically and without the participation of the microprocessor.As long as the position and velocity can be written into the specified register control motor.TMC428 multi-port RAM controller can manage data access sequence.In this way,the microprocessor can read/write registers at any time

and on chip RAM data.Through waveform generator can handle is stored in registers in the motion parameters and calculate the motor speed curve.Pulse generator is calculated according to the waveform generator speed to generate the step pulse.Stepper pulse generating TMC428 drive serial interface will automatically send packets to stepper motor drive Daisy chain to drive the stepper motor.When using microstep control,micro step started processing unit according to the step pulse

produced by the pulse generator,at the same time according to the selection of micro step resolution

steps to produce the whole,half step and micro pulse,and gave the Daisy chain drive by driving a

serial port.