Stepping Motor Drive mode

by:V&T Technologies     2020-01-07
Stepping motor drive mode, the development of stepping motor drive technology, from the original foreign outshine others to the emergence of various excellent technologies in China, we can see the progress of domestic technology, and at the same time, we can also see that, every technological innovation will bring several markets that use high-end technologies to guide the market **. 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. Advantages: The circuit is simple, the components are few, the control is simple, and the implementation is relatively simple. Disadvantages: A triode with sufficient current must be provided for switching processing, and the running speed of the stepping motor is relatively low, the motor has a large vibration and a large heat. Since it is no longer used, it is not described much. Stepper motor driver 2. For high and low voltage drive, due to the above 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. Advantages: high and low voltage control improves vibration and noise to a little 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. Disadvantages: The circuit is relatively complex in constant voltage driving, and the requirements for high frequency characteristics of triode 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. Advantages: 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. Disadvantages: 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 (The main technologies currently used in the market) Current comparison chopper drive converts the winding current value of stepping motor into A certain proportion of voltage, compares it with the preset value output by D/A converter, and compares the results to control the switch of power tube, so as to achieve the purpose of controlling winding phase current. Advantages: the motion control simulates the characteristics of sine wave, greatly improves the performance, the motion speed and noise are relatively small, and relatively high subdivision can be used, which is the current popular control method. Disadvantages: The circuit is relatively complex, the interference in the circuit is difficult to control and the theoretical requirements are consistent, jitter is easy to occur, and the peaks and troughs forming sine waves are controlled, which 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 is a brand-new motion control technology. This 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. Advantages: in addition to the advantages of current comparison chopper drive, the heating is particularly small and the service life is longer. Disadvantages: new technology, high price, currently each stepping motor and driver matching requirements are relatively strict. Related reading: working principle of Fuji servo motor, stepping motor uses standard TAG stepping motor drive
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