Constant voltage driving Single voltage driving means that during the operation of the motor winding, only one direction voltage is used to supply power to the winding, and multiple windings alternately supply voltage. This method is an older driver, and it is basically no longer needed.
Advantages: The circuit is simple, the components are few, the control is simple, and the implementation is relatively simple. Disadvantages: It is necessary to provide a triode with a large enough current for switching processing, the motor running speed is relatively low, the motor vibration is relatively large, and the heat is large. Since it is no longer used, it is not described much.
High-low voltage drive due to the above-mentioned shortcomings of constant voltage drive, the further development of technology, the development of new high and low voltage drive to improve some of the shortcomings of constant voltage drive, the principle of high and low voltage drive is to use high voltage when the motor moves to the whole step Control, use low pressure control when moving to half step, and use low pressure to control when stopping.
Advantages: High and low voltage control improves vibration and noise to a certain extent. For the first time, the concept of stepping motor is subdivided, and the working mode of halving current at stop is also proposed.
Disadvantages: The circuit is relatively complex with constant voltage driving, and the high-frequency characteristics of the triode are required to be improved. The low-speed motor still vibrates relatively loudly, and the heat is still relatively large. Basically, this driving mode is not used.
The self-excited constant current chopper drive self-excited constant current chopper drive works by hardware design. When the current reaches a certain set value, its current is turned off by hardware, and then the other winding is energized. When the current supplied by the winding reaches a certain fixed current, it can be turned off by hardware, and so on, the stepping motor is driven.
Advantages: The noise is greatly reduced, the speed is improved to some extent, and the performance is improved compared with the first two.
Disadvantages: The circuit design requirements are relatively high, the circuit anti-interference requirements are relatively high, easy to cause high frequency, burn out the drive components, and the component performance requirements are relatively high.
Current comparison chopper drive (the main technology used in the market)
The current comparison chopper drive converts the stepper motor winding current value into a certain proportion of voltage, compares it with the preset value of the D/A converter output, and compares the result to control the power tube switch to achieve the control winding phase current. purpose.
Advantages: The motion control simulates the characteristics of the sine wave, greatly improves the performance, the motion speed and the noise are relatively small, and the relatively high subdivision can be used, which is the currently popular control method.
Disadvantages: The circuit is more complicated, the interference in the circuit is difficult to control and the theoretical requirements are consistent, and it is easy to generate jitter. When controlling the peaks and troughs of the sine wave, it is easy to cause high-frequency interference, which may cause the driving element to heat up or the frequency is too high. Aging, which is the main reason why many drivers are prone to red light protection when they are used for more than a year.
Submersible drive (new technology adopted by Shuoke CNC)
This is a brand new motion control technology, which is a new driving method that is innovative under the premise of current current chopper driving technology to overcome its shortcomings. The core technology is to increase the driving element heating and high frequency suppression protection technology under the premise of current comparison chopper driving.
Advantages: In addition to the advantages of current comparison chopper drive, the heat is particularly small and the service life is long.
Disadvantages: New technology, the price is relatively high, currently the matching requirements of each motor and driver are relatively strict.
The development of drive technology, from the original foreign ones to the emergence of various domestic excellent technologies, can be seen in the progress of domestic technology, but also can be seen that every technological innovation will bring several market revolutions to guide the market with high-end technology. Today, when the stepping technology is relatively mature, Shuoke CNC brings a new stepping drive technology to push the domestic stepper drive to the international market again. Originally relying on imported drivers to obtain high-performance domestic manufacturers, seeing this technology. After the content stated, I believe that the expectations of domestic technology will change from the inside. The domestic engineers who used to import small Japanese are now asking them to find a reason to reject the small Japanese products. They can say NO again with Little Japan.
Extralings: Subdivision Technology
The subdivision technology is a kind of technology to improve the precision extended by the above various driving technologies. This kind of technology has certain limitations to improve the accuracy. It is not that your driver has 128 subdivisions, and its accuracy. It is equal to 1.8 degrees divided by 128, I believe that the comrades who are deeply involved in the step-driven technology are recognized by me; and those who tell you that the accuracy of 1.8 degrees is divided by 128 are nothing more than the following three kinds of people:
1. Conductor: Hear from others and say to others;
2, the promoter: I hope you buy something with him, tell you to listen;
3, the involved: just started to contact the stepper drive, have not carefully pondered the technology.
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