Stepper motors have been widely used in electromechanical integration equipment such as machine tools because of their reasonable price, high cost performance and convenient control. The stepping motor must rely on the signal provided by the controller and the driving power supply to complete the up-conversion, down-conversion, fast-forward, variable-speed, stop, reverse, etc., so the level of the control circuit and the driving power supply determines the running performance of the stepping motor and stability. How to make control simpler, more convenient, and more economical is another important topic in the application of stepper motors.
At present, a large number of mechatronics equipment, machine tool equipment and automated production equipment have adopted PLC control, and some of them need to adopt stepper motor servo control drive scheme. For example, it is necessary to realize multi-speed, multi-stroke feed control or auxiliary control (grinding feed, automatic grinding wheel correction, etc.).
The PLC itself does not have a high-speed pulse output. To this end, an additional intelligent control module matching the stepper motor control is added on the basis of the PLC. The module is equipped with a subdivided driving power supply, and the cost of the entire control part is relatively high, which limits the promotion and use of the stepping motor driver.
In order to overcome the above problems, Shanshe Motor has supplied a new type of control driver product, which makes full use of the various resources and high running speed of the single-chip microcomputer, and uses software to complete various hardware functions and other functions, and the stepper motor control module and driver. The power supply is combined into one. The hardware circuit is simplified, the cost is greatly reduced, and the size is small, and the installation and use are convenient. It is widely used in two-phase, no more than 3A hybrid stepping motors (80 series and below).
The control driver is based on the current popular ATM89C51 with 4K FLASH ROM, as shown in Figure 1, including input, D/A conversion, power amplification and other modules.
The biggest feature of this control driver is software. The following main functions are accomplished through software: input scanning, lifting frequency, software pulse ringing and full/subdividing switching.
The MCU receives level signals from four external input ports: one for control direction: the other three bits are used to control speed, and different combinations of them can select 7 commonly used operating frequencies and stop reset states (as shown in the attached table). ). Automatically complete the lifting frequency, the whole step / subdivision switching, etc., and output the pulse after the ring.
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