Electric motor having grounding contact of a controller

An electric motor, comprising:

• a rotor unit, which rotates about a vertical center axis extending in a vertical direction;
• a stator unit, which is disposed around the rotor unit;
• a housing where the stator unit is fixed inside;
• and
• a bearing mechanism, which rotatably supports the rotor unit relative to the stator unit;
• wherein
• the housing includes:
• a cylindrical wall portion, the stator unit being located inside of the cylindrical wall portion;
• a bottom which is provided at a bottom vertical end of the cylindrical wall portion and which extends radially outward;
• and
• a cover plate which is on one side of the stator unit that is opposite to the bottom;
• the cover plate is fixed to a radially inner side surface of the cylindrical wall portion and covers an opening of the cylindrical wall portion;
• the bearing mechanism includes at least two bearings, one of the at least two bearings is supported by the cover plate and another of the at least two bearings is supported by the bottom of the housing;
• the cover plate is made of electrically conductive elements and includes three projections protruding away from the stator unit;
• at least a portion of the at least one projection overlaps the radially inner side surface of the cylindrical wall portion when viewed in a radial direction so that the at least one projection contacts, directly or indirectly, at least one grounding contact of a controller which drives and controls the electric motor on one side of the cover plate and the controller is electrically connected to a ground potential through the housing;
• and
• the three projections are disposed at equal distances from each other in a circumferential direction of the cover plate.