Linear module with built-in AC servo motor

Abstract

The invention discloses a linear module with a built-in AC servo motor. The linear module includes a housing, an AC servo motor, a lead screw assembly and a bearing. The AC servo motor includes a motor silicon steel sheet, a motor coil and a rotor assembly. The rotor assembly passes through a through hole in the middle of the motor silicon steel sheet and is installed in the motor silicon steel sheet. The motor coil is wound inside the motor silicon steel sheet. The lead screw assembly includes a lead screw and a ball lead screw nut. The bearing is connected on a sliding seat through a bearingsupport plate, and the bearing is located on both sides of the AC servo motor or the ball lead screw nut. By adopting the ball lead screw nut fixation and nut rotary motion mode, the AC servo motor is installed in the sliding seat. With the movement of the ball lead screw nut, miniaturization and microminiaturization can be achieved, vast space is saved, and multiple motors can be arranged to operate separately without mutual interference. The motor of the invention has lower cost than a linear motor, and has faster rotation speed and higher precision than a stepping motor. Motor power can bereduced, and the motor of the invention is more energy-saving and more environmentally-friendly.

Description

technical field [0001] The invention relates to the technical field of automation devices, in particular to a linear module with a built-in AC servo motor. Background technique [0002] At present, the motor linear module on the market is a through-type stepping motor plus a trapezoidal screw. The stepping motor is an open-loop motor, and the current position and speed cannot be known. The maximum speed can only reach 700 revolutions per minute, so it cannot rotate at high speed. , high-speed rotation will lose steps, resulting in inaccurate walking position, and can not achieve precise positioning; the trapezoidal screw is used inside, and the trapezoidal screw has large friction, easy loss, large temperature rise, poor accuracy, low speed, poor rigidity, and Caton, the trapezoidal screw nut has no bearing support, is made of copper or plastic, and has a large backlash. [0003] Secondly, the external servo motor is connected through a coupling or a synchronous pulley, and...

AI Technical Summary

Problems solved by technology

[0002] At present, the motor linear module on the market is a through-type stepping motor plus a trapezoidal screw. The stepping motor is an open-loop motor, and the current position and speed cannot be known. The maximum speed can only reach 700 revolutions per minute, so it cannot rotate at high speed. , high-speed rotation will lose steps, resulting in inaccurate walking position, and can not achieve precise positioning; the trapezoidal screw is used inside, and the trapezoidal screw has large friction, easy loss, large temperature rise, poor accuracy, low speed, poor rigidity, and Caton, trapezoidal screw nut without bearing support, made of copper or plastic, large backlash

[0003] Secondly, the external servo motor is connected through a coupling or a synchronous pulley, and the length is long. In the case of rapid acceleration and deceleration, the coupling has axial torsion problems and cannot respond to changes in the motor speed in real time. For example, in embroidery machines and laser cutting machines, the speed requirements cannot be met in real time, and the coupling itself will also have related problems including fracture, screw slippage, inability to hold the motor shaft and screw shaft tightly, and the service life of the timing belt is short. Flexible structure reduces overall rigidity

[0004] In addition, the traditional module adopts the movement mode of screw rotation and fixed nut. The screw itself has a certain mass and has a moment of inertia when it rotates. The maximum critical speed is limited, resulting in the external servo losing part of the torque to drive the screw. Rotation, and the rotation of the long-stroke screw will appear like a "rope skipping" phenomenon, resulting in unstable system operation, machine shaking, and loud noise

[0005] Furthermore, the external servo motor cannot perform full-closed-loop feedback after being connected by a coupling and a ball screw. At the same time, the increase in transmission components reduces the stability and accuracy of the system. Traditional linear modules can only be equipped with one motor to control one nut action. Unable to achieve independent movement of multiple sliding seats

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