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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
Fax: 0086-755-88350011
E-mail: sales@contmp.com |
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| Trends |
| Electrical Technology Co., Ltd. Lee when the two software products to obtain registration certificate |
| 2009-08-02 18:44:16 |
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With the large number of stepper motor control to market bearing grinding machine, stepper motor control system is also an increasing number of surface, single-axis stepper motor control system is also less, but more than two-axle The stepper motor system, such as the two systems are often not synchronized, such as size, scattered and poor fault instability.
Stepper motor system problems are manifold. We groove ball bearing inner ring analysis done grinder, has tried several brands of internal stepper motor and found that the two systems are not synchronized is very serious. Sync error test from the PLC, digital control module, stepper motor drives and stepper motor to start.
Ball Screw lead 4mm, harmonic reduction ratio reducer to 1:80, step-by-step moment angle of 0.9 °.
Stepper motor positioning error has been repeated more than machine accuracy of the test 3 times. In accordance with the pulse equivalent to 0.125μm, the table repeat the positioning error in a total of 20 times has been achieved 0.003. Table 1 Description of the data is not just stepping motor error, the error of the mechanical system becomes even more evident.
We analyzed this machine feeding mechanism and compensation agencies, found that more serious mechanical problems. First, the ball screw small nominal diameter (Φ20), the accuracy of three low grade, and handle more serious crawling phenomenon; Second, to the quick jump into the fuel tank and the ball screws designed positioning, assembly location of deviation can not be eliminated ; Third, the harmonic reducer and ball screw locking screw is not only a key link to connect or sell; Fourth, without the use of ball screws, bearings and so on.
Then we analyzed the machine's electrical system, found in Inverters, transformers and stepper motor controller placed near side, the data from the PLC output cables without shielding, with a strong set and weak electric cables and so mixed问题. These issues are the impact of stepping motor system instability. Pulse equivalent to 0.125μm.
As the stepper motor system in our country less interference, the electrical design of the layout will have the chance unreasonable direct feed system and error compensation system, combined with systematic errors of mechanical systems, machine tools will work in an unstable状态.
Is not to say that as long as the machine tool hydraulic systems feed into a compensation to the compensation into the stepper motor system, the whole machine will be on comprehensive performance improved significantly. Stepper motor to replace the original complex hydraulic feed compensation system, the original spare parts of hydraulic and mechanical fluctuations in the processing chain drive eliminates the error, and stepper motor to the process can be divided into several stages, each stage can be Selection of different feeding frequency control pulse rate, pulse number can be used to control the machine tool table to improve, it is indeed the hydraulic system than the original bearing grinder a big progress. However,
Is followed by other relevant parts of machine tools along with updates to the design of the grinding machine will meet the technical requirements for processing. Both the mechanical structure design or the design of the electrical system should not ignore the stepper motor system is relatively weak anti-interference characteristics. If we question the above solution is not a proper solution, if the overall machine tool parts and components, especially the key mechanical components or hydraulic system was the standard machine, the stepper motor system control grinder bearings will not be essentially the be improved. |
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