China's economic growth rate will still exceed 8% this year and next year

In its annual economic publication "Asia Development Outlook 2012", ADB predicts that as the world's second largest economy, China's GDP growth rate will reach 8.5% in 2012 and 2013 after reaching 9.2% in 2011. % And 8.7%. The inflation rate is expected to remain at around 4% in the next two years. Paul Haydens, chief representative of the ADB representative office in China, pointed out at a press conference in Beijing that in the next two years, investment will continue to be the main engine driving China’s economic growth. Infrastructure construction areas such as railways, agricultural irrigation and urban public transportation Investment in other areas will accelerate. In addition, China will build 7 million affordable housing units this year, which will partially offset the impact of the slowdown in real estate investment growth. In terms of consumption, Haydens believes that the driving force for China's consumption growth in the future will come from the continuous improvement in employment conditions, the increase in wage levels and the continuous increase in government social expenditures. The ADB report predicts that imported inflationary pressure will be reduced this year, and the government's continued regulation of the real estate market will also help control domestic inflation. “Although China’s CPI rebounded to 3.6% year-on-year in March, which exceeded analysts’ expectations, the inflation rate will continue to decline throughout the year.” Haydens believes that as China’s inflationary pressures ease, this year’s macroeconomic policy The focus will shift from "controlling inflation" to "stabilizing growth." The report believes that in the next two years, China's fiscal policy is expected to continue to be expansionary, and fiscal expenditures will continue to tilt toward education, medical care, pensions, affordable housing and other social security projects. Monetary policy will remain stable. In addition, as rising costs have affected the competitiveness of Chinese export products, the pace of RMB appreciation may slow down. Haydens pointed out that the main downside risk facing China's economy comes from the fragility of external demand. In view of the deteriorating terms of trade and the bleak global economic outlook, the contribution of net exports to economic growth is still negative. In addition, we must be alert to the impact of domestic local government debt. He suggested that China should continue to firmly promote inclusive growth and environmentally sustainable development to ensure the sustainability of economic growth.

Servo motor maintenance methods and summary of common problems

Servo motors are one of the important components used in current drive equipment. There are many types and brands of servo motors. Among them, FANUC and Mitsubishi's servo motors are the most widely used. When we use the servo motor, we often have some small faults because of the long time of use. I have sorted out these small faults. Although it is not as good as the company's professional maintenance personnel, it can also be used as a preliminary understanding. Servo motor repair Observe whether sparks are generated between the carbon brush and the commutator when the motor is running and the degree of sparks to repair: 1. There are only 2 to 4 tiny sparks. If the surface of the commutator is flat at this time. In most cases, repair is not necessary; 2. There is no spark. No need to repair; 3. There are more than 4 very small sparks, and there are 1 to 3 large sparks, you don't need to disassemble the armature, just use sandpaper to grind the carbon brush commutator; 4. If there are more than 4 large sparks, the commutator needs to be polished with sandpaper, and the carbon brush and armature must be removed. Replace the carbon brush and polish the carbon brush. Repair of commutator: 1. The surface of the commutator is obviously uneven (touch by hand) or sparks when the motor is running, as in the fourth case. At this time, the armature needs to be disassembled and the converter is processed with a precision machine tool; 2. It is basically flat, but there are very small scars or sparks. For example, in the second case, l mouth 1 is hand-grinded with water sandpaper without disassembling the armature. The order of grinding is: first press the outer circle of the commutator Radial, process a wooden tool, cut several different thickness of water sandpaper into strips as wide as the commutator, and remove the carbon brush (please pay attention to the carbon brush groove on the handle of the removed carbon brush Make a mark on the top to ensure that the left and right are not changed during installation. Use a wooden tool wrapped with sandpaper to fix the commutator, press the motor rotation direction with the other hand, and gently rotate the shaft commutator to grind. Servo motor repairs use the order of the thickness of sandpaper to be coarser and then finer. When a piece of sandpaper is too blind to use, change to a finer sandpaper until the fine water sandpaper (or metallographic sandpaper) is used up. How to align the servo motor encoder phase with the rotor magnetic pole phase zero point: 1. Phase alignment of incremental encoder The alignment method between the phase of the UVW electronic commutation signal of the incremental encoder with commutation signal and the phase of the rotor magnetic pole, or the electrical angle phase, is as follows: (1) Use a DC power supply to pass a DC current less than the rated current to the UV winding of the motor, U input, V output, and orient the motor shaft to a balanced position; (2) Observe the U-phase signal and Z signal of the encoder with an oscilloscope; (3) Adjust the relative position of the encoder shaft and the motor shaft; (4) While adjusting, observe the transition edge of the encoder U-phase signal and the Z signal until the Z signal is stable at a high level (here the normal state of the Z signal is low by default), lock the encoder and motor Relative position relationship (5) Twist the motor shaft back and forth, after letting go, if the Z signal can be stabilized at a high level every time the motor shaft freely returns to the equilibrium position, the alignment is valid. 2. Phase alignment of absolute encoder The phase alignment of the absolute encoder is not much different for single-turn and multi-turn. In fact, the phase alignment of the encoder is aligned with the phase of the electrical angle of the motor within one turn. The current practical method is to use the EEPROM inside the encoder to store the measured phase after the encoder is randomly installed on the motor shaft. The specific method is as follows: (1) Install the encoder on the motor randomly, that is, consolidate the encoder shaft and motor shaft, as well as the encoder shell and motor shell; (2) Use a DC power supply to pass a DC current less than the rated current to the UV winding of the motor, U input, V output, and orient the motor shaft to a balanced position; (3) Use the servo drive to read the single-turn position value of the absolute encoder and store it in the EEPROM that records the initial phase of the electrical angle of the motor inside the encoder; (4) The alignment process ends. Foshan Chuangchi Electromechanical Equipment Co., Ltd. is a company specializing in the sales of FANUC and MITSUBISHI CNC machine tool control system accessories. At the same time, it provides customers with CNC equipment maintenance, providing fanuc servo motor repair, Fanuc CNC System repair, FANUC servo drive repair, FANUC servo motor repair, FANUC system acc

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About FANUC FANUC CNC system repair and maintenance explanation

About FANUC FANUC CNC system repair and maintenance: (Foshan Chuangchi Electromechanical Equipment Co., Ltd.) FANUC FANUC machine tool repair, FANUC CNC system repair, FANUC FANUC CNC system controller repair service provider. If you need other FANUC parts repair, please call our company. Professionally provide FANUC (Fanuc) CNC system component maintenance. Professional FANUC (FANUC) maintenance test platform for professional FANUC CNC system component maintenance. Foshan Chuangchi Electromechanical Equipment Co., Ltd. is a professional repair company for industrial equipment circuit boards and chip-level repairs. It is a high-tech enterprise integrating development, sales and service. As a high-tech enterprise leading the market with technological innovation, Chuangchi Electromechanical Equipment pays special attention to the absorption and training of talents. The company has nearly 20 senior engineers. The company's service scope includes: Siemens, Kobe, Barmag, AB, LG, ABB, Meidensha, Danfoss, Lenze, Fuji, Sanken, Mitsubishi, Yaskawa, Omron, Schneider, Ryan, LUST, SEW, Baomi Le and other high and low voltage inverters, FANUC CNC repairs, CNC CNC system repairs, industrial control equipment, inverters, DC drives, servo PLCs, touch screens and other automated industrial control products repair. How to troubleshoot the external electromagnetic induction interference of the inverter? (1) The necessity of eliminating interference sources In the internal circuit of the inverter, although certain anti-interference measures are set and taken, due to the large difference in the working environment of the inverter, the anti-interference measures of various types of inverters are not exactly the same, so It is very important to take noise suppression measures outside the inverter to eliminate the source of interference. (2) Methods to reduce or eliminate electromagnetic interference In order to reduce or eliminate electromagnetic interference that causes the control loop of the variable frequency speed regulation system to malfunction, the following methods can usually be used: ① If there are some measures for contact control appliances (such as relays, contactors, circuit breakers, etc.) around the inverter working environment, the control coils should be connected in parallel to prevent surge current absorption components or devices ② In order to prevent interference from the power input of the inverter, an input filter should be installed at the power input of the inverter. ③For control circuits requiring shielded cables, reliable shielding and grounding must be conducted in accordance with regulations: the grounding terminal of the inverter must also be connected to a safe and reliable point grounding wire in accordance with regulations. ④ Shorten the cable distance between the inverter control circuits as much as possible, and isolate it from the inverter power supply and output main lines How does the spike voltage affect the motor in the variable frequency speed regulation system The output voltage of the inverter contains high-order harmonic impulse voltage (1) Diminishing strength Used in motor coils, it will reduce the insulation strength of the motor coil windings, especially the PWM control type inverter is more obvious. (2) Coil insulation damage is the output voltage waveform of the inverter when there is no filter. There is an obvious impulse voltage at the rising edge of the inverter output voltage waveform. If suppression measures are not taken, it is easy to cause damage to the motor coil insulation. How to avoid the impact of the peak voltage formed by the high-frequency switch on the motor? (1) Treatment method In order to prevent the premature aging of the insulation of the motor coil or damage to the motor and frequency converter, it is usually possible to provide a method of adding an output reactor to reduce the high-order harmonic impulse voltage on the motor terminal pin. For PwM type inverters, a filter should also be installed on the voltage input side of the motor. Filter added (2) Problems that need to be explained. The method of installing a filter on the voltage input side of the motor When the cable between the frequency converter and the motor is long, although the output reactor can reduce the peak load current, the output reactor cannot reduce the transient voltage peak on the motor terminal. Therefore, be sure to shorten the length of the cable between the inverter and the motor as much as possible.

Introduction to the classification of Mitsubishi CNC systems