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Nowadays in CNC cutting machine related products, many product accessories need to be carefully selected and maintained, especially new CNC cutting machine products, but also need to understand the product and performance of CNC cutting machine, otherwise it will happen once The problem is that it is difficult to handle the drive unit including the drive unit and the motor. The purchase of the drive unit mainly lies in the selection of the drive unit. Because the motor is a common component, the performance difference exists only in different manufacturers and models.
Drive motors can be divided into three major categories: reactive stepper drive motors, hybrid (also known as permanent magnet reaction) stepper drive motors and servo drive motors.
Reactive stepper drive motor rotor without windings, by the excitation of the stator windings generate reaction torque to achieve stepping operation. The permanent magnet for the rotor of the hybrid stepper motor is stepped by the electromagnetic torque generated by excitation and permanent magnets. The stepper motor is controlled by pulses. The direction of rotation of the motor can be changed by changing the order of energization. Changing the frequency of the pulse can change the rotation speed of the motor. The stepper motor has a certain step accuracy and there is no cumulative error. But the efficiency of the stepper motor is low, the ability to drag the load is not large, the pulse equivalent can not be too large, the speed range is not large. At present, the stepping motor can be divided into two phases, three phases, and five equal ones. The commonly used stepping motor is a five-phase stepping motor. For a long time in the past, stepper motors accounted for a large market, but are currently being replaced by servo motors.
At present, the commonly used CNC flame cutting machine servo motor is an AC servo motor, equipped with an optical encoder at the shaft end of the motor, and used for frequency conversion control by detecting the rotor angle. From the lowest speed to the highest speed, the servo motor can run smoothly and the torque ripple is small. The servo motor has a long overload capacity, a small moment of inertia and a large stall torque. The servo motor has a very small starting frequency and can quickly accelerate from the lowest speed to the rated speed.
The AC servo motor is used as the driving device, which can be the same as a DC servo motor to form a high-precision, high-performance semi-closed-loop or closed-loop control system. As the brushless AC servo motor structure, almost no maintenance, relatively small size, is conducive to speed and power increase. At present, DC servo motors have been replaced in a wide range. After the emergence of a fully digital AC servo system using high-speed microprocessors and dedicated digital signal processors (DSPs), the original hardware servo control was changed to software servo control, and advanced algorithms in some modern control theories were realized, which greatly improved the Because of the performance of the servo system, the servo unit can greatly improve machining efficiency and machining accuracy, but the price of the servo drive unit is also high. With the gradual improvement of the servo control technology, the servo drive unit is gradually becoming the main force of the drive unit, and the price of the servo drive unit is gradually reduced.
There are two servo drives. An impulse control method is adopted. Such a driver and the motor are closed-loop, but they are not fed back to the numerical control system. Such a driver can be called open-loop servo control to some extent. Another kind adopts the voltage control method, carries on the electrical machinery rotational speed control through the voltage level, the electrical machinery feedback signal passes the driver feedback to the numerical control plasma cutter to carry on the position control.
When selecting the drive unit, the proportion of the drive unit's price in the entire CNC machine tool should also be considered. The lower price of the entire CNC machine tool generally chooses a stepping drive unit, while the higher-priced machine tool selects the servo drive unit. However, when selecting the drive unit, the matching between the drive unit and the numerical control system must also be considered. When selecting the closed-loop control system, the closed-loop servo drive unit must be selected. AC servo systems are superior to stepper motors in many performance aspects. However, stepper motors are often used to perform the motor in some less demanding applications. Therefore, in the design process of the control system, various factors such as control requirements and costs should be comprehensively considered, and appropriate control motors should be selected.
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March 12, 2023