Since the nineteen eighties, as integrated circuits, power electronics and AC variable speed drive technology development, permanent magnet AC servo drive technology has the prominent development, international well-known electrical manufacturers have introduced their own AC servo motor and servo drive products and constantly improve and update. AC servo system has become a modern high performance servo system the main development direction, so that the original DC servo facing the crisis of being eliminated. After 90 time, countries in the world have already been commercialized AC servo system using full digital controlled sine wave motor servo drive. AC servo drive device on the transmission field development change rapidly.

Permanent magnet AC servo motor DC servo motor with comparison, the main advantages are : 1 without brushes and a commutator, so reliable, low requirement for maintenance and maintenance. The stator winding heat dissipation is more convenient. The moment of inertia is small, easy to improve system speed. It adapted to the high speed high torque working state. It is under the same power has smaller volume and weight. Since the German MANNESMANN Rexroth Indramat division in 1978 at the Hannover trade fair officially launched MAC permanent magnet AC servo motor and drive system, which marks the new generation of AC servo technology has entered a practical stage. Until the nineteen eighties later, each company has a complete series of products. The servo device market turned to AC system. Early analog system such as zero drift, anti interference, reliability, accuracy and flexibility of the deficiencies, can not fully meet the requirements of the motion control, in recent years with the microprocessor, digital signal processor ( DSP ) application, appeared digital control system, control part can be entirely by software, are known as the inclusion oboro only Shen or Tuan Stachyurus fresh world war, what just Shen AC PMSM Servo system. So far, the high performance servo system mostly adopts the permanent magnet synchronous AC servo motor drive, control using fast, accurate positioning of the full digital position servo system. Typical manufacturers such as Germany's Siemens, the United States Cole Morgan and Japanese companies such as Panasonic and yaskawa. Japan Yasukawa motor produced by the launch of small AC servo motors and drives, which D series applied to CNC machine tools ( the maximum speed of 1000r / min, torque is 0.25 ~ 2.8N.m ), R series applies to the robots ( the maximum speed of 3000r / min, torque is 0.016 ~ 0.16N.m ). After the introduction of M, F, S, H, C, G six series. Nineteen ninties has launched a new D series and R series. From the old series of rectangular wave driving, 8051 single chip control to sine wave drive, 80C, 154CPU and gate array chip control, torque fluctuation is reduced from 24% to 7%, and the reliability is improved. In this way, only a few years time formed a series of eight ( range 0.05 ~ 6kW ) is a complete system, to meet the working mechanism, conveying mechanism, welding robot, robot assembly, electronic components, machinery, printing machine, high-speed winding machine, winding machine, different needs. In the production of machine tool numerical control device and the famous Japanese law that G ( Fanuc ) company, in the nineteen eighties medium also launched a series of S ( 13 specifications ) and L series ( 5 specifications ) of permanent magnet AC servo motor. L series have smaller moment of inertia and mechanical time constant, applied to the requirements of special fast response servo system. Other Japanese manufacturers, such as: Mitsubishi Motors ( HC-KFS, HC-MFS, HC-SFS, HC-RFS and HC-UFS Series ), Toshiba machine ( SM Series ), big iron work (BL Series ), Sanyo Electric ( BL Series ), stone motor ( S Series ) and many other manufacturers have also entered the permanent magnet AC servo system in competition. Germany Rexroth company ( Rexroth ) of the Indramat branch of the MAC series AC servo motor a total of 7 model 92 specifications. Germany Siemens ( Siemens ) the company's IFT5 series three-phase permanent magnetic AC servo motor is divided into standard type and short type two categories, a total of 8 model 98 kinds of specifications. It is alleged that the series AC servo motor with the same output torque of the DC servo motor IHU series compared to, weight only 1 / 2, supporting the transistor PWM driver 6SC61 series, most can be used for 6 axis motor control. Germany Bosch ( BOSCH ) Company production of ferrite permanent magnet SD series ( 17 specifications ) and the rare earth permanent magnet SE series ( 8 specifications ) and Servodyn SM series AC servo motor drive controller. The United States famous servo device production company Gettys once as Gould Electronics Corporation, a division ( Motion Control Division ), the production of M600 series AC servo motor and A600 series servo driver. After the merger to the recovery of AEG, Gettys, A700 full digital AC servo system. The United States of America A-B ( ALLEN-BRADLEY ) company drive division production of type 1326 ferrite permanent magnet AC servo motor and 1391 AC PWM servo controller. The motor comprises 3 frame 30 sizes. I.D ( Industrial Drives ) is a famous American Cole Morgan ( Kollmorgen ) industrial drive division, BR-210, BR-310, BR-510 has produced three series of 41 specifications of the brushless servo motor and BDS3 type servo drive. Since 1989, launched a new series designed with his stealing. ( Goldline ) permanent magnet AC servo motor, including the B ( small inertia ), M ( of inertia ) and EB ( type ) three kinds big, 10, 20, 40, 60, 80, five model, each class has 42 specifications, all use of NdFeB permanent magnet materials, torque range of 0.84 ~ 111.2N.m, 0.54 ~ 15.7kW power range. Accessory drive BDS4 ( Analog ), BDS5 ( digital type, including position control ) and Smart Drive ( digital ) three series, the maximum continuous current 55A. Goldline series represents the contemporary permanent magnet AC servo technology newest level. The Irish Inland was Kollmorgen in an overseas division, now merged into the AEG, in the production of DC servo motor, DC torque motor and servo amplifier. Production of 2200, 3300 BHT1100, three model 17 kinds of specifications of SmCo permanent magnet AC servo motor and a eight controller. The French Alsthom group in Paris Parvex factory production LC series ( long ) and GC series ( short ) AC servo motor a total of 14 specifications, and the production of AXODYN series drive. The former Soviet Union for the numerical control machine tool and control the development of the two series of AC servo motor. The By series using ferrite permanent magnet, a two frame, each frame has 3 core length, each with two winding data, a total of 12 specifications, continuous torque range of 7 ~ 35N.m. 2 By series using rare earth permanent magnet, a 6 frame and 17 specifications, torque range of 0.1 ~ 170N.m, supporting the 3 type controller. In recent years, Japanese Panasonic launched a full digital MINAS series AC servo system, the permanent magnet AC servo motor MSMA series of small inertia type, power from 0.03 ~ 5kW, 18 kinds of specifications; medium inertia type MDMA, MGMA, MFMA three series, power from 0.75 ~ 4.5kW, 23 kinds of specifications, MHMA series of large inertia motor power ranges from 0.5 to 5kW, 7 kinds of specifications. Korea SamSung company in recent years the development of the digital control for permanent magnet AC servo motor and drive system, in which the FAGA AC servo motor a series of CSM, CSMG, CSMZ, CSMD, CSMF, CSMS, CSMH, CSMN, CSMX variety of models, power from 15W to 5kW. Now often use (Powerrate ) which is a comprehensive index as the servo motor quality factor, a measure of comparison of all kinds of AC and DC servo motor and stepper motor dynamic performance. Power change rate of said motor continuous ( rated ) torque and rotor inertia ratio. According to the power change rate analysis, permanent magnet AC servo motor technology index to American I.D Goldline series is the best Siemens, Germany IFT5 series of.