Robot controller

1. A robot controller configured to control a motor of a robot,

the robot controller comprising:

a housing accommodating a heat generating part that generates heat;

a vent hole that is open on a wall of the housing;

a fan configured to supply air, introduced through the vent hole into the housing, to the heat generating part; and

a lid part configured to cover the vent hole, wherein:

the wall is a first wall;

the fan is a first fan; and

a second wall of the housing is made of a material having high heat conductivity, the heat generating part being fixed to the second wall,

the robot controller further comprising:

a cover covering the second wall and including an opening portion; and

a second fan arranged so as to be opposed to the opening portion and configured to supply the air to an inside of the cover through the opening portion.

2. The robot controller according to claim 1 , further comprising a heat sink detachably attached to an outer surface of the second wall, wherein:

the cover covers the heat sink; and

the second fan supplies the air to the heat sink.

3. The robot controller according to claim 1 , wherein the second fan is arranged so as to be opposed to the lid part and the opening portion and supplies the air to the lid part and the inside of the cover.

4. The robot controller according to claim 1 , further comprising an attaching portion by which the second fan is detachably attached to the housing, wherein

the lid part is attached to the attaching portion.

5. The robot controller according to claim 1 , wherein the housing has a rectangular solid shape and includes:

a main body including the first wall, the second wall, and a third wall opposed to the first wall; and

a fourth wall opposed to the second wall and detachably provided at the main body.

6. The robot controller according to claim 1 , wherein an electric power supply connector by which electric power is supplied to the second fan is provided on an outer surface of the first wall.