Motor including bus bars and bus bar holder

1. A motor, comprising:

a rotor including a shaft with a center on a center axis extending in one direction toward both a first side and a second side;

a stator enclosing the rotor and rotating the rotor about the center axis;

a first bearing located at a first side of the stator in the one direction and supporting the shaft;

a second bearing located at a second side of the stator in the one direction opposite to the first side of the stator and supporting the shaft;

a cylindrical housing holding the stator and the first bearing;

a bus bar assembly holding the second bearing, and allowing an end of a first side of the bus bar assembly to be located in the housing;

a cover fixed to the housing to cover at least a portion of a second side of the bus bar assembly;

a circuit board disposed between the second bearing and the cover in the one direction, and allowing a surface of a second side of the circuit board to cross the one direction;

a sensor magnet directly or indirectly fixed to the shaft at a second side of the second bearing; and

a rotation sensor which is attached to the circuit board, and faces the sensor magnet in the one direction; wherein

the bus bar assembly includes:

a bus bar electrically connected to the stator;

a wiring member electrically connecting an external power supply to the circuit board; and

a bus bar holder holding the bus bar and the wiring member;

the bus bar holder includes:

a cylindrical main body portion including an opening at a second side of the cylindrical main body portion; and

a connector portion protruding from the main body portion toward a radially outer side of the center axis;

the wiring member includes:

an external power-supply connection terminal provided to the connector portion to be electrically connected to the external power-supply; and

a circuit board connection terminal electrically connected to the circuit board;

the bus bar includes a coil connection portion that protrudes from an inner surface of the main body portion and is electrically connected to a coil of the stator;

an end of a second side of the coil connection portion is located ahead of a surface of a first side of the circuit board toward the second side of the circuit board;

the bus bar holder includes a second bearing holding portion that holds the second bearing, and a connection portion that connects the main body portion to the second bearing holding portion;

the connection portion is located at a second side of the connection portion ahead of an end of a first side of the second bearing holding portion; and

at least a portion of the sensor magnet overlaps with the connection portion in a radial direction.

2. The motor of claim 1 , wherein at least a portion of the coil connection portion overlaps with the circuit board in the radial direction.

3. The motor of claim 1 , wherein at least a portion of the second bearing holding portion overlaps with the stator in the radial direction.

4. The motor of claim 1 , wherein the surface of the second side of the circuit board is perpendicular or substantially perpendicular to the one direction.

5. The motor of claim 1 , wherein the circuit board connection terminal and the coil connection portion are located at different positions in a circumferential direction of the center axis.

6. The motor of claim 1 , further comprising:

a sensor magnet holding portion attached to the shaft and holding the sensor magnet;

wherein

at least a portion of the sensor magnet holding portion overlaps with the second bearing in the radial direction.

7. The motor of claim 1 , wherein:

the circuit board connection terminal includes a plate-shaped portion; and

the plate-shaped portion includes a connection surface parallel or substantially parallel to the surface of the second side of the circuit board; wherein

the connection surface is in contact with the surface of the second side of the circuit board.