Servo driver

Abstract

The invention discloses a servo driver, and belongs to the technical field of servo drivers. The servo driver comprises a connecting piece, and a housing cover plate, an IGBT power module, a PCB circuit board and a housing base which are stacked together in sequence. The connecting piece comprises a plurality of support rings and a plurality of connecting bolts, the plurality of support rings are respectively inserted into the notches of the IGBT power module, the plurality of support rings are arranged at intervals along the circumferential direction of the IGBT power module, one end of each connecting bolt is sleeved with a connecting nut, the connecting bolts sequentially penetrate through the shell cover plate, the IGBT power module, the corresponding supporting rings, the PCB and the corresponding connecting bolts, and the connecting bolts are in threaded fit with the corresponding supporting rings. And the shell cover plate and the shell base are detachably connected together. According to the servo driver provided by the invention, the weight of the IGBT power module does not act on the PCB, pseudo soldering or falling of a welding spot is avoided, and the reliability and the safety of the servo driver are improved.

Description

technical field [0001] The invention belongs to the technical field of servo drives, and more specifically relates to a servo drive. Background technique [0002] In the fields of numerical control, industrial robots, injection molding machines, textile machinery, packaging machinery, etc., with the continuous improvement of the level of industrial automation, higher requirements are put forward for the efficiency and performance of servo drives. Among them, the reliable installation of the IGBT power module is the key to the reliable operation of the servo drive. [0003] In the related art, the IGBT power module is installed as follows: use self-tapping screws to pass through the through holes of the PCB circuit board and screw into the four mounting feet of the IGBT power module, fix the PCB circuit board and the IGBT power module together, and then install the IGBT power module. The pins of the module are welded to the PCB circuit board to achieve the purpose of reducin...

AI Technical Summary

Problems solved by technology

[0004] However, in the high-power electromechanical servo system in the aerospace field, due to specific space constraints, the area of ​​the PCB circuit board is large, and the mechanical environment requirements such as vibration and impact are more stringent.

The area of ​​the PCB circuit board is large, and accordingly, the amplitude becomes larger. Since the housing base of the IGBT power module is made of metal, the weight of the IGBT power module makes the vibration of the PCB circuit board worse, resulting in the pins of the IGBT power module and the PCB circuit. The stress of the solder joints between the boards is relatively large, and it is easy to form a virtual solder joint or even fall off. In more serious cases, the pins of the IGBT power module will be forced to be pulled out and the module will fail.

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