4. What is a servo motor? How many types are there? What are the operating characteristics?
A: Servo motors, also known as actuator motors, are used as actuating elements in automatic control systems to convert the received electrical signals into angular displacements or angular velocity output on the motor shaft. Divided into two categories of DC and AC servo motors, its main feature is that there is no self-rotating phenomenon when the signal voltage is zero, and the speed decreases uniformly with the increase of torque.
What is the difference between the AC servo motor and the brushless DC servo motor in terms of function?
Answer: AC servo is better because it is sinusoidal wave control, torque pulsation is small. DC servo is trapezoidal wave. But DC servo is simpler and cheaper.
Permanent magnet AC servo motor
Since the 1980s, with the development of integrated circuits, power electronics and AC variable-speed drive technology, permanent magnet AC servo drive technology has been an outstanding development, the famous electrical manufacturers have launched their respective AC servo motor and servo drive series products and continue to improve and update. AC servo system has become the main development direction of contemporary high-performance servo system, so that the original DC servo facing the crisis of being eliminated. 90 years later, the world has commercialized AC servo system is the use of fully digital control of the sine wave motor servo drive. AC servo drive in the field of transmission development is changing rapidly. Permanent magnet AC servo motor with DC servo motor comparison, the main advantages are:
1) no brushes and commutator, so work reliably, low maintenance and maintenance requirements.
(2) stator winding heat dissipation is more convenient.
(3) Small inertia, easy to improve the rapidity of the system.
(4) Adapted to high speed and large torque working condition.
(5) Smaller size and weight under the same power.
Since the German MANNESMANN's Rexroth's Indramat division in 1978 Hanover Trade Fair officially launched the MAC permanent magnet AC servo motor and drive system, which marks such a new generation of AC servo technology has entered the stage of practicality. By the mid to late 1980s, companies have a complete range of products. The entire servo device market has shifted to AC systems. Early analog systems such as zero drift, anti-interference, reliability, accuracy and flexibility, there are shortcomings, can not fully meet the requirements of motion control, in recent years, with the application of microprocessors, new digital signal processor (DSP), the emergence of digital control systems, the control part of the software can be completely carried out by the software, respectively, known as ???Hazel???? Only or tuan ging fresh, valiant? Only the permanent magnet AC servo system.
To date, most of the high-performance electric servo system using permanent magnet synchronous type AC servo motor, control drive more fast, accurate positioning of the full digital position servo system. Typical manufacturers such as Germany Siemens, the United States Kollmorgen and Japan's Panasonic and Yaskawa and other companies.
YASKAWA Electric Japan introduced a small AC servo motor and drive, which D series for CNC machine tools (maximum speed of 1000r/min, torque of 0.25 ~ 2.8N.m), R series for robotics (maximum speed of 3000r/min, torque of 0.016 ~ 0.16N.m). Later on, six more series were introduced: M, F, S, H, C, G. In the 1990s, the new D and R series were successively introduced. From the old series of rectangular wave drive, 8051 microcontroller control to sinusoidal wave drive, 80C, 154 CPU and gate array chip control, torque fluctuations from 24% to 7%, and improve reliability. In this way, it took only a few years to form a more complete system of eight series (power range of 0.05 ~ 6kW) to meet the different needs of working machines, handling mechanisms, welding robots, assembly robots, electronic components, processing machinery, printing machines, high-speed winding machines, winding machines, etc..
To produce machine tool CNC devices and the famous Japanese Fanuc (Fanuc) company, in the 1980s
Period also introduced the S series (13 specifications) and L series (5 specifications) of permanent magnet AC servo motors. L series
There is a smaller inertia and mechanical time constant for the requirements of a particularly rapid response to the position of the servo system. servo systems that require particularly fast response.
Other Japanese manufacturers, such as Mitsubishi Electric (HC-KFS, HC-MFS, HC-SFS, HC-RFS and HC-UFS series), Toshiba Seiki (SM series), Okuma Tetsusho (BL series), Sanyo Electric (BL series), Tateishi Electric (S series) and many others, have also entered the permanent magnet AC servo system fray.
Germany's Rexroth's (Rexroth) Indramat division's MAC series of AC servo motors *** has 92 specifications in seven machine numbers.
The IFT5 series of three-phase permanent-magnet AC servo motors from Germany's Siemens are divided into two categories: standard and short, with 98 specifications in eight chassis numbers. It is claimed that the series of AC servo motor with the same output torque DC servo motor IHU series, compared to the weight of the latter only 1/2, supporting the transistor pulse width modulation driver 6SC61 series, up to 6 axes of motor control.
Germany's BOSCH produces ferrite permanent-magnet SD series (17 specifications) and rare-earth permanent-magnet SE series (8 specifications) AC servo motors and Servodyn SM series drive controllers.
Gettys, a leading American servo manufacturer, was once a division of Gould Electronics (Motion Control Division), producing the M600 series of AC servo motors and the A600 series of servo
drives. The company merged with AEG, reverted to the Gettys name, and introduced the A700 fully digital AC servo system.
The Drive Division of A-B (ALLEN-BRADLEY), USA, produced the Model 1326 Ferrite Permanent Magnet AC Servo Motor and the Model 1391 AC PWM Servo Controller. The motors include 3 seat numbers***30 sizes.
I.D. (Industrial Drives) is the famous Kollmorgen (Kollmorgen) Industrial Drives Division, has produced BR-210, BR-310, BR-510 three series of *** 41 specifications of the brushless servo motors and BDS3-type servo drive. Since 1989, we have introduced a new series of Goldline permanent magnet AC servo motors, including B (small inertia), M (medium inertia), and EB (explosion-proof), with five models of 10, 20, 40, 60, and 80 chassis, and 42 specifications for each major category, all of which are made of neodymium-iron-boron (NdFeB) permanent magnets, and have torque ranges from 0.84 to 111.2 N.m, and power ranges from 0.54 to 15.5 N.m. The new series of motors are also available in the market. The power ranges from 0.54 to 15.7kW, and the supporting drives are BDS4 (analog type), BDS5 (digital type with position control) and Smart Drive (digital type), with a maximum continuous current of 55A. The Goldline series represents the latest level of contemporary permanent magnet AC servo technology.
Inland, Ireland, formerly a foreign division of Kollmorgen, now merged with AEG, is known for its production of DC servo motors, DC torque motors and servo amplifiers. The company produces SmCo permanent magnet AC servo motors and eight controllers in 17 sizes for the BHT1100, 2200, and 3300 seat numbers***.
France's Alsthom Group produces the LC series (long type) and GC series (short type)
AC servo motors*** in 14 sizes and the AXODYN series of actuators at its Parvex plant in Paris.
The former Soviet Union developed two series of AC servo motors for CNC machine tools and robot servo control. Which ДBy series using ferrite permanent magnets, there are two chassis number, each chassis number has three kinds of core length, there are two kinds of winding data, *** 12 specifications, continuous torque range of 7 ~ 35N.m. 2 ДBy series of rare-earth permanent magnets, 6 chassis number 17 specifications, torque range of 0.1 ~ 170N.m, supporting the 3 ДБ type controller.
In recent years, Japan's Panasonic launched the all-digital MINAS series of AC servo systems, in which the permanent magnet AC servo motor MSMA series of small inertia type, the power from 0.03 ~ 5kW, **** 18 kinds of specifications; inertia type MDMA, MGMA, MFMA three series, the power from 0.75 ~ 4.5kW, ***23 kinds of specifications, the MHMA series of large inertia type, the power from 0.75 ~ 4.5kW, ***23 kinds of specifications. The MHMA series of large inertia motors have a power range from 0.5 to 5kW, with 7 specifications.
South Korea's Samsung developed in recent years all-digital permanent magnet AC servo motors and drive systems, which FAGA AC servo motor series CSM, CSMG, CSMZ, CSMD, CSMF, CSMS, CSMH, CSMN, CSMX a variety of models, the power from 15W ~ 5kW.
Now often used gambling β time XI?
Nowadays, it is often used to compare the dynamic response performance of various AC/DC servo motors and stepping motors by using this comprehensive index as the quality factor of servo motors, which is the power rate (Powerrate). The power rate of change indicates the ratio of continuous (rated) motor torque to rotor moment of inertia.
Calculated and analyzed according to the rate of change of power, it can be seen that the technical index of permanent magnet AC servo motor is the best in the U.S.A. I.D's Goldline series, and Germany Siemens' IFT5 series is the second best.
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Servo motors and stepper motors are not required to drive the driver