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CN-122029729-A - Motor driving device

CN122029729ACN 122029729 ACN122029729 ACN 122029729ACN-122029729-A

Abstract

The invention provides a motor driving device, which is provided with a cover, wherein the cover is easy to install on a shell and is difficult to fall off from the shell after installation. The motor driving device includes a charging portion, a housing accommodating the charging portion and having an opening, a cover configured to be fitted to the housing and to cover the opening of the housing, at least one protrusion formed on one of the housing and the cover, and at least one recess formed on the other of the housing and the cover for fitting the protrusion. The projection has a first tapered surface inclined in such a manner that the height of the projection decreases along the fitting direction of the projection with respect to the recess. Or on the basis of this, the recess has a tapered groove inclined in such a way that the depth decreases in the direction of the assembly.

Inventors

  • HATTORI YOSHITAKA

Assignees

  • 发那科株式会社

Dates

Publication Date
20260512
Application Date
20231027

Claims (13)

  1. 1. A motor driving device, wherein, The motor driving device comprises: A charging section; a case which houses the charging unit and has an opening; a cover configured to be attached to the housing and to cover the opening of the housing; At least one protrusion formed on one of the housing and the cover, and At least one recess formed in the other of the housing and the cover for the protrusion to fit, The motor driving device satisfies at least one of the condition that the protrusion has a first tapered surface inclined in such a manner that a height of the protrusion decreases along an assembling direction of the protrusion with respect to the recess, and the recess has a tapered groove inclined in such a manner that a depth decreases along the assembling direction.
  2. 2. The motor driving device according to claim 1, wherein, At least one of the projection and the recess has a cylindrical shape, and the cover is configured to be rotatable with respect to the housing with the projection as a fulcrum.
  3. 3. The motor drive apparatus according to claim 2, wherein, The protrusion has the first tapered surface, and the recess has a groove having a width smaller than a diameter of the recess.
  4. 4. A motor driving apparatus according to claim 2 or 3, wherein, The protrusion has the first tapered surface and a second tapered surface having a different inclination direction from the first tapered surface.
  5. 5. The motor driving device according to claim 2, wherein, The motor driving device includes at least 1 protruding portion formed on one of the housing and the cover, and at least 1 recessed portion formed on the other of the housing and the cover, the protruding portion and the recessed portion being arranged and configured to hold the cover in an open state with respect to the housing by fitting the protruding portion into the recessed portion.
  6. 6. The motor driving device according to claim 5, wherein, The housing has a groove adjacent to the recess and extending toward an outside of the housing.
  7. 7. The motor driving device according to claim 1, wherein, At least one of the housing and the cover has a notch that facilitates flexing of the housing or the cover.
  8. 8. The motor driving device according to claim 2, wherein, The housing has a divided structure including a first housing portion and a second housing portion, and a gap is formed between the first housing portion and the second housing portion on a rotation axis of the cover relative to the housing.
  9. 9. The motor driving device according to claim 2, wherein, The cover has a locking mechanism that secures the cover relative to the housing.
  10. 10. The motor driving device according to claim 9, wherein, The locking mechanism includes a U-shaped portion that is elastically deformable, and a grip portion that is formed in the U-shaped portion and is engageable with the housing.
  11. 11. The motor driving device according to claim 10, wherein, The lock mechanism includes a stopper for restricting displacement of the grip portion at a substantially center in a width direction of the U-shaped portion, the width direction being perpendicular to the elastic deformation direction.
  12. 12. The motor driving device according to claim 10, wherein, The lock mechanism includes stoppers for restricting displacement of the grip portion on both sides of the U-shaped portion in a width direction perpendicular to an elastic deformation direction.
  13. 13. The motor driving device according to claim 9, wherein, The locking mechanism is configured to be openable and closable by using a tool.

Description

Motor driving device Technical Field The present disclosure relates to motor drive devices. Background Motor driving devices are known as driving devices for driving motors used for driving axes of machine tools and robots, for example. A general motor drive device includes electronic components such as a power element and a capacitor for supplying current to a motor. The motor drive device includes, as electrical connection means for these electronic components, a bus bar (bus bar) made of metal such as copper, brass, or aluminum, a fixed terminal for mounting the bus bar on a substrate, or the like. The bus bar is disposed in a case formed by resin molding, for example. In addition, since the bus bar is sometimes mounted by a user, some motor driving apparatuses include a housing that houses a substrate on which the bus bar is mounted and has an opening portion so that the bus bar on the substrate can be accessed by the user, and a cover that covers the opening portion of the housing to protect the bus bar. Prior art literature Patent literature Patent document 1 Japanese patent laid-open No. 04-162598 Patent document 2 Japanese patent application laid-open No. 2018-032919 Patent document 3 Japanese patent application laid-open No. 2019-213419 Disclosure of Invention Problems to be solved by the invention The cover of the motor driving device is preferably assembled easily because it is assembled to the housing after the user mounts the bus bar to the substrate in the housing. On the other hand, since a large current may flow in the bus bar, it is not preferable that the cover be easily detached from the case from the viewpoint of safety such as prevention of electric shock. Accordingly, a motor drive device having a cover that is easily attached to a housing and is difficult to separate from the housing after attachment is desired. Solution for solving the problem One embodiment of the present disclosure is a motor drive device including a charging portion, a housing that houses the charging portion and has an opening, a cover configured to be fitted to the housing and to cover the opening of the housing, at least one protrusion formed on one of the housing and the cover, and at least one recess formed on the other of the housing and the cover to be fitted with the protrusion, the motor drive device satisfying at least one of the condition that the protrusion has a first tapered surface inclined in such a manner that a height of the protrusion decreases in a fitting direction of the protrusion with respect to the recess, and the recess has a tapered groove inclined in such a manner that a depth decreases in the fitting direction. Drawings Fig. 1 is a schematic perspective view of a motor driving device according to an embodiment. Fig. 2 is a perspective view of the vicinity of the cover of the first embodiment. Fig. 3 is an enlarged partial view of the cover of fig. 2. Fig. 4 is a partial enlarged view of fig. 2. Fig. 5 is a perspective view of the vicinity of the cover of the second embodiment. Fig. 6 is an enlarged partial view of the cover of fig. 5. Fig. 7 is a perspective view of the vicinity of the cover of the third embodiment. Fig. 8 is an enlarged partial view of the cover of fig. 7. Fig. 9 is a perspective view of the vicinity of the cover of the fourth embodiment. Fig. 10 is an enlarged partial view of the cover of fig. 9. Fig. 11 is a perspective view of the cover and housing of fig. 9 from another angle. Fig. 12 is a perspective view showing a state in which the cover of fig. 11 is turned 90 degrees. Fig. 13 is a perspective view of the vicinity of the cover of the fifth embodiment. Fig. 14 is an enlarged partial view of the cover of fig. 13. Fig. 15 is a perspective view of the vicinity of the joint portion of the cover and the housing of the sixth embodiment. Fig. 16 is a perspective view of the cover and housing of fig. 15 from another angle. Fig. 17 is a perspective view of the vicinity of the cover of the seventh embodiment. Fig. 18 is an enlarged partial view of the cover of fig. 17. Fig. 19 is a perspective view of the vicinity of the cover of the eighth embodiment. Fig. 20 is a schematic perspective view of a motor drive device of the ninth embodiment. Fig. 21 is a top view of the motor drive apparatus of fig. 20. Fig. 22 is a perspective view of the vicinity of the cover of the tenth embodiment. Fig. 23 is an enlarged view of the locking mechanism of the cover of fig. 22. Fig. 24 is a cross-sectional view taken along line XXIV-XXIV of fig. 23. Fig. 25 is a perspective view of the vicinity of the cover of the eleventh embodiment. Fig. 26 is an enlarged view of the locking mechanism of the cover of fig. 25. Fig. 27 is a cross-sectional view taken along line XXVII-XXVII of fig. 26. Fig. 28 is a perspective view of the vicinity of the cover of the twelfth embodiment. Fig. 29 is a cross-sectional view taken along line XXIX-XXIX of fig. 28. Fig. 30 is an enlarged view of the locking mecha