The linear screw stepping motor drive technology can ensure a fairly high performance level and has higher simplicity than the traditional motor drive device that converts rotary motion into linear motion. Since the linear motor is directly connected to the moving load, there is no back clearance between the motor and the load, and the flexibility is very small.
The advantages of linear screw stepping motor in machine tool application are as follows:
1. The linear drive device can achieve a capacity of less than 1 μ M/s or speeds up to 5m/s. The linear drive system can ensure constant speed characteristics, and the speed deviation is better than ± 0.01%. In applications requiring higher acceleration, smaller linear screw stepping motors can easily provide an acceleration greater than 10g, while traditional motors generally generate an acceleration within the range of 1g.
2. The linear screw stepping motor has a simple structure and is composed of few components, so it requires less lubrication (the linear guide needs regular lubrication). This means that it has a long service life and runs cleanly. In contrast, the traditional drive system consists of more than 20 parts, including motor, coupling, ball screw, U-block, bearing, pillow block and lubrication system.
Other advantages of linear screw stepping motor include lower force and smaller velocity ripple, thus ensuring a more stable motion profile. Of course, it depends on the structure of the motor, magnetic plate and driving software. In order to take advantage of the inherent dynamic braking of linear screw stepping motor, the drive amplifier should effectively monitor the inverse electromotive force (EMF), even if the system power supply may be turned off. Multiple linear screw stepping motors can be installed in a "back to back" manner to ensure that the force is increased. Additional magnetic plates can also be added to ensure substantial unlimited travel (limited by feedback equipment and cable length) without loss of accuracy.
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