Echo and A Boy in Our University
Echo was born in a rich family. She was the school flower of our university and every student discussed her every day. She turned a blind eye on any other outstanding boy’s pursuit and fell in love with a poor boy on the contrary. No one of us could understand why she should have had fallen in love him. She would ride her gas powered bicycle or take a taxi to school before she fell in love with him, but she went by the bus when she decided to ran after him, because she wanted to take the opportunity to meet him in a short distance. He rode his electric trike to avoid her, because he thought that he did not match her and he did not want to become other students’ jokes. But she still insisted to pursue him. He told her one day that he did not want her like that and that she could find a better man than him. She went on her homemade brushless motor electric car and ran after him with the quickest speed. She told me that she would never give up pursuing him before he promised her.
Paragraph. 单击此处进行编辑.
Domestic R & D of Servo motor
Servo motors have a wide range of applications military, industrial and daily life. With the ripe of computer technology and the development of field technology, it also contributed to the servo system implementations and architecture continues to evolve. Control constituter’s digital control servo system has attracted more and more attention. Fieldbus-based Distributed servo system has many advantages, such as less connection, high reliability, easy system maintenance and expansion and so on. Currently, foreign corporations Siemens, ORM EC Systems, Rexroth and other companies already have launched their own product distributedservo motor controller system; Some domestic scholars also has sponsored the research of this units, but the relevant papers is countable, and there is Nor a series of products.
Servo motors have a wide range of applications military, industrial and daily life. With the ripe of computer technology and the development of field technology, it also contributed to the servo system implementations and architecture continues to evolve. Control constituter’s digital control servo system has attracted more and more attention. Fieldbus-based Distributed servo system has many advantages, such as less connection, high reliability, easy system maintenance and expansion and so on. Currently, foreign corporations Siemens, ORM EC Systems, Rexroth and other companies already have launched their own product distributedservo motor controller system; Some domestic scholars also has sponsored the research of this units, but the relevant papers is countable, and there is Nor a series of products.
The origin of servo motor
Servo: from the meaning of .Greek word "slave". People want to make "servo organization” into a docile tool, so as to subject to the requirements of control signal. Before the signal came, the rotor is stationary; when the signal came, it immediately turns the rotor; but when the signal disappears, the rotor can be immediately stopped. Because of its "server" performance, hence the name was adopted.
Servo motors are generally divided into DC servo and AC servo. as to servo DC motors, the advantages is that it with accurate speed control, hard torque speed characteristic , simple principle, easy operation methods and cheaper price. But it also accompanies with some disadvantages, such as brush commutation, speed limits, additional resistance generated, wear particles (for clean room).
Servo motors are generally divided into DC servo and AC servo. as to servo DC motors, the advantages is that it with accurate speed control, hard torque speed characteristic , simple principle, easy operation methods and cheaper price. But it also accompanies with some disadvantages, such as brush commutation, speed limits, additional resistance generated, wear particles (for clean room).
China developed permanent magnet coreless motor
According to the spot news of rare-earth permanent magnet coreless motor promotion exhibition which organized by National Development and Reform Commission in Shenzhen: rare-earth permanent magnet coreless motor developed by the Shenzhen Special Electrical Co., Ltd. Antoine Hill, coreless motor to achieve major design breakthroughs of Coreless motor designation.
Rare-earth permanent magnet coreless motor is the future direction of the motor industry on behalf of a new type of special motors, adopting non-core, brushless, non-magnetic damping, and rare earth permanent magnet power generation technology to change the structure of silicon steel sheet and winding the motor stator, combined with independent research and development electronic smart inverter technology, make the ac motor system efficiency up to 95% or more.
CNC servo motor control
In recent years, the servo motor control technology is moving into the exchange, digital and intelligent three directions. As executive body of CNC machine tools, servo system will integrate power electronic devices, control, drive and protection into a combination, And with advancements of the digital pulse width modulation technology, special electrical materials technology, microelectronic technology and modern control technology, it has gone from stepping into the DC motor, then to the development process of ac motor.
In addition, advanced sensor technology has greatly improved AC motor speed control system dynamic response and positioning accuracy. AC servo motor control system generally used in brushless resolver, hybrid optical encoder and absolute encoder as position, speed sensor, the sensor has a response time of less than 1μs.
Continuous rotation servo motor
All of servo motor can be changed into variable speed motor. General speaking, control the motor speed and direction need a motor driver chip and other components, and servo motors have been equipped with these devices. Modified servo motor is the most common and cheapest, to get the robot used in the transmission method of digital control, thus get a continuous rotation of the servo motor. This change is partly mechanical and partly. The electrical partly is changing electrical potentiometer into two fixed resistors with resistance, mechanical changes will prevent the motor part of the full rotation of the stopper from removing. motor is precise instrument, if you have no professional knowledge, you’d better not open it.
DC brushless motor
With the development of control technology and the increasing demand for energy-saving society，DC brushless motor as a new type of high efficiency motor has been widely used. Traditional brushless DC motor control use square-wave, they are easy to implement, however there are some limitations in the application of some areas that have requirements for noises. For these applications, the use of sine wave control can solve this problem.
Sine wave brushless DC motor control that is exerted by a certain voltage motor windings, the motor windings produce sinusoidal current by controlling the amplitude and phase sinusoidal current to control the motor torque purposes. Compared with the traditional square wave than a sinusoidal motor phase current and continuous change, no change relative to current mutation, so the motor running with low noise.
EKCW series brushless motor
China Refrigeration Exhibition "best new product" refers to the products that with the principle of independent research and development, with a certain degree of technical innovation and advanced, in line with low-carbon, green, environmentally friendly principles and fully reflects their own technological progress and development. After a rigorous assessment of the TRP layers, EKCW series DC brushless motor fan coil eventual acquire consensus appreciation and was selected as ‘outstanding new products’ for the show.
EKCW Series DC brushless motor fan coil adopts new patented brushless DC technology which researches by EKCW EUROKLIMAT Group and China Aerospace Science and Engineering Group, realizing the diversification of step less speed control by virtue of leading air treatment technology. In this process, brushless motors play a key role.
Permanent magnet synchronous AC servo motor technology
With the development of modern industrial right precision, high-speed, high-performance requirements，the traditional motor controller is no longer competent in high requirement occasion , in many demanding real-time, high efficiency occasion, it must use special digital signal processor (DSP) to replace some of the traditional controller function. Especially in the complex control algorithms or optimization algorithms, DSP’s unique ability to quickly calculate the apparent manifestation.
In addition, with the advancement of integrated circuit manufacturing technology and the development of power electronics, AC servo has also been considerable development. A position and velocity measurements was built in AC servo motor encoder, in most cases, the waveform directly out from encoder is irregular.
Servo motor
It is need system to provide precise position control and speed control in the servo motors system, at the same time, it also asked to fast respond, high speed, turning smooth and stable torque. As for higher requirements System, the control of servo motor is more complex, the system controller, motor drive, position and speed sensing must be formed into a closed loop control system; as to motor commutation, the current the motor uses a lot of Huo Seoul sensor feedback to achieve commutation, the accuracy of switch Hall sensor is not too high. But new-developed
AVAGO surpass six-channel commutation optical encoder AEDB-9340 series, it can simply develop the feedback mechanism brushless DC motor (BLDC) servo system closed loop. this machine helps to save significant designation and development of motor manufacturers; and the sensor accuracy of switches is also much higher.
The application of brushless DC motor
With the development of power electronics technology, new permanent magnet materials and the fast computing power of the DSP (digital signal processor), the applications of brushless DC motor is growing popularity. Compared with DC motors, Brushless DC motors has similar high speed performance, it also overcome the commutation spark, low reliability and other defects that DC motors using mechanical reversing device caused.Brushless DC motor with the characteristics of small size, light weight, high efficiency, flexible shape and size, so it is widely used in servo system, CNC machine tools, electric vehicles, household appliances and other various fields, it has become the main direction of modern servo technology.
Paragraph. 单击此处进行编辑.
