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Shenzhen And Engineering Co., Ltd.
Address: 5D, Yunsong Building, Tairan Industrial and Trade Park, Futian District, Shenzhen
Tel: 0086-755-88350033 /88350081
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| Trends |
| CNC servo motor control technology developments |
| 2009-08-02 18:39:40 |
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(has been browse 113 times)
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February 17, 2009 Electrical Engineering Electrical Technology
Modern motor control theory of the development of CNC machine tool servo systems of exchange, digital, intelligent CNC system, servo motor and the commonly used control system are:
(A) open-loop control system
Used as a stepper motor-driven devices, do not have the location and speed of detection devices, there is no feedback circuit, control circuit simple and cheap. Stepper motor and the main difference between an ordinary motor lies in its control of the pulse, it is this characteristic of stepper motor can and modern digital control technology. However, in the control of stepper motor accuracy, speed, range, low-speed performance are not as good as the traditional closed-loop control of DC servo motor. In high precision is not in need of special occasions can be used on the stepper motor, stepper motor can play its simple structure, high reliability and low cost characteristics.
(B) semi-closed-loop and closed-loop position control system
DC servo motor or AC servo motor as the drive components, can be used with the built-in electric pulse encoder or brushless resolver tachogenerator as location / speed detection device to form the semi-closed-loop position control system can also be used directly grating installed in the workbench or inductosyn position detection device as to constitute a high-precision closed-loop position control system-wide.
70's, the United States invented the machine tool company GATTYS DC servo motor torque, since the beginning of a large number of countries in the use of CNC machine tools DC servo motor drive. Open-loop system gradually replaced by the closed-loop system. DC servo motor to drive the device as a DC servo system, control circuit is relatively simple, lower price. Its main drawback is that it has a DC servo motor for the mechanical device, easy to wear brushless, maintenance workload and easy run-time from spark to the motor to increase speed and power of the larger difficulties. Although the induction motor are cheap, simple structure, but the early performance as a result of poor
Therefore, a long time not been applied on the NC system. With the power of electronic technology and modern development of the theory of motor control, in 1971, Germany's Siemens invented the Blaschke AC asynchronous machine vector control method; in 1980, Leonhard German research team led by the microprocessor in the application of vector control progress in the study so that the practical use of vector control. From the late 70s, the gradual introduction of CNC machine tools for the induction motor spindle drive motor.
If the DC motor structure, "in turn" to deal with, that is, around the armature assembly in the stator, rotor part for the permanent magnet and the rotor shaft encoder to measure the magnetic pole position control switch for the electronic exchange of electronic phase, which constitutes a permanent magnet brushless DC motor. |
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