Motor
A motor includes a rotor, a stator, a bearing, a motor housing, a bearing holder, and a bus bar. The rotor includes an axially extending shaft. The stator radially opposes the rotor. The bearing rotatably supports the shaft. The motor housing accommodates the stator and opens to one axial side. The bearing holder holds the bearing and covers the opening of the motor housing. The bus bar is connected to the conductive wire drawn out from the stator and is located on the bearing holder. The bearing holder includes a recess radially outside of the bearing and including an upper surface recessed to the other axial side. The bus bar includes a base portion and a connection portion. The base portion is located radially outside of the recess and extends in the circumferential direction.
1. A motor comprising:
a rotor including an axially extending shaft;
a stator radially opposing the rotor;
a bearing that rotatably supports the shaft;
a motor housing that accommodates the stator and that opens to one axial side;
a bearing holder that holds the bearing and that covers an opening of the motor housing; and
a bus bar connected to a conductive wire drawn out from the stator and located on the bearing holder; wherein
the bearing holder includes a recess that is located radially outside of the bearing and that includes an upper surface recessed to another axial side;
the bus bar includes:
a base portion located radially outside of the recess and extending in a circumferential direction; and
a connection portion that extends from the base portion to the other axial side and that is connected to the conductive wire; and
at least a portion of the connection portion is located in the recess.
2. The motor according to claim 1 , wherein
the bearing holder includes a coupling portion that is located radially outside of the recess and that protrudes to the other axial side;
the coupling portion is fitted into an opening of the motor housing; and
the axially other end of the recess is located on one axial side relative to the axially other end of the coupling portion.
3. The motor according to claim 1 , wherein
a plurality of the base portions have a plate shape and overlap in the axial direction; and
the connection portion extends radially inward from a radially inner surface of each of the base portions.
4. The motor according to claim 1 , wherein the bus bar includes a terminal portion extending radially outward from a radially outer surface of the base portion and connected to an external connection terminal.
5. The motor according to claim 1 , wherein a circuit board on which a sensor to detect a rotational position of the rotor is mounted is located on one axial side of the bus bar.
6. The motor according to claim 5 , wherein the sensor is located on one axial side of the shaft and detects a rotational position of the rotor by detecting a magnetic flux of a sensor magnet located at one axial side end portion of the shaft.
7. The motor according to claim 6 , wherein
the sensor magnet is connected to the shaft via a magnet holding portion;
the bearing holder includes a tubular cylindrical portion that surrounds the center axis and in which the magnet holding portion is located; and
one axial end of the magnet holding portion is located on the other axial side relative to one axial end of the cylindrical portion.
8. The motor according to claim 7 , wherein another axial end of the connection portion is located on the other axial side relative to the one axial end of the magnet holding portion.
9. The motor according to claim 6 , wherein at least a portion of the base portion overlaps with the sensor magnet in the radial direction.
10. The motor according to claim 1 , further comprising a motor cover that covers the bus bar from one axial side.
11. The motor according to claim 10 , wherein the motor cover has a disc shape, and includes a radially outer end located radially outside of a radially outer end of the base portion.
12. The motor according to claim 1 , wherein
a circuit board on which a sensor that detects a rotational position of the rotor is mounted is located on one axial side of the bus bar;
the sensor is located on one axial side of the shaft and detects a rotational position of the rotor by detecting a magnetic flux of a sensor magnet located at one axial side end portion of the shaft;
the motor further includes a motor cover that covers the bus bar from one axial side and that is located on the other axial side relative to the circuit board; and
the motor cover has an axial thickness of a region axially opposing the sensor and the sensor magnet thinner than a thickness of a region other than the region axially opposing the sensor and the sensor magnet.