These driving methods of stepping motor have both advantages and disadvantages

by:V&T Technologies     2020-01-11
The development of driver technology, from the original only abroad to the emergence of various excellent technologies in China, can be seen in the progress of domestic technology, at the same time, we can also see that the development of high-end technology brought about by the technological revolution leads the market revolution. Nowadays, with the rapid development of electronic technology and computer technology, the demand for stepping motors is also increasing. It can be said that stepping motors are used in all walks of life. Where there is a stepping motor, there is a stepping motor driver. 1. Constant voltage drive, single voltage drive means that in the process of motor winding operation, only one direction voltage is used to supply power to the winding, and multiple windings alternately provide voltage. This method is a relatively old driving method, which is basically not used now. With this kind of drive, the circuit is simple, the components are few, the control is simple, and the implementation is relatively simple. However, it must provide a transistor with sufficient current for processing. The Stepping Motor has relatively low running speed, large vibration and large heat generation. 2. High and low voltage drive. Due to many shortcomings of constant voltage drive and the further development of technology, new high and low voltage drive is developed to improve some shortcomings of constant voltage drive. The principle of high and low voltage drive is, high-voltage control is used when the motor moves to the whole step, low-voltage control is used when the motor moves to half step, and low-voltage control is also used when the motor stops. High and low voltage control improves vibration and noise to a certain extent. For the first time, the concept of subdivision control of stepping motor is proposed, and the working mode of halving current when stopping is also proposed. However, the circuit is relatively complex in constant voltage driving, and the requirements for high frequency characteristics of triodes are improved. The motor still has large vibration at low speed and large heat generation. Now this driving mode is basically not used. 3. Self-excited constant current chopper drive the working principle of self-excited constant current chopper drive is to turn off the current through hardware when the current reaches a certain set value through hardware design, and then switch to another winding for power supply, when the current energized by the other winding reaches a certain fixed current, it can be turned off by hardware, thus pushing the stepping motor to run repeatedly. In this way, the noise is greatly reduced, the rotating speed is improved to a certain extent, and the performance is improved to a certain extent compared with the previous two. However, the requirements for circuit design are relatively high, the requirements for circuit anti-interference are relatively high, it is easy to cause high frequency, burn out the drive components, and the requirements for component performance are relatively high. 4. Current comparison chopper Drive, current comparison chopper drive is to convert the winding current value of stepping motor into A certain proportion of voltage and compare it with the preset value output by D/A converter, compare the results to control the winding phase current. This kind of driving mode makes the motion control simulate the characteristics of sine wave, greatly improving the performance, the motion speed and noise are relatively small, and relatively high subdivision can be used, which is the current popular control method. However, this circuit is relatively complex. It is difficult to control the interference in the circuit and the theoretical requirements are consistent. It is easy to generate jitter. When controlling the peaks and troughs of the sine wave, it is easy to cause high frequency interference, this leads to the heating of the driving element or aging due to excessive frequency, which is also the main reason why many drivers are prone to red light protection when used for more than a year. 5. Submersible drive, which is a brand-new motion control technology, is based on the premise that the current current is compared with chopper drive technology, A brand-new driving method to overcome the shortcomings and innovate. Its core technology is to increase the driving element heating and high frequency suppression protection technology on the premise of current comparison chopper driving. However, this kind of price is relatively high, and the matching requirements for each stepping motor and driver are relatively strict at present. TAG high and low voltage drive
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