In-wheel motor with motor position sensor and brake system
A vehicle wheel assembly comprises: a wheel for mounting a tire thereon; and an in-wheel motor mounted in the inner space of the wheel and comprising: a rotor connected to the wheel, wherein a magnet is mounted to a center portion of the rotor rotatably coupled with a bearing assembly and arranged at a rotation axis of the wheel, a stator configured to drive the rotor, a rotary sensor disposed in sensing relationship with the magnet mounted to the center portion of the rotor, the rotary sensor configured to be responsive to rotation of the magnet for generating a signal, and an electronic device comprising a circuit board and electronics; and a brake actuator configured to apply brake to the wheel or the rotor. The electronics mounted on the circuit board comprise a single electronic control unit configured to control both the in-wheel motor and the brake actuator.
1. A vehicle wheel assembly comprising:
a wheel for mounting a tire thereon and having an inner space,
an in-wheel motor mounted in the inner space of the wheel and configured to drivingly rotate the wheel, the in-wheel motor comprising:
a rotor connected to the wheel, wherein a magnet is mounted to a center portion of the rotor rotatably coupled with a bearing assembly and arranged at a rotation axis of the wheel,
a stator configured to drive the rotor, wherein the rotor is configured to be rotatable relative to the stator,
a rotary sensor disposed in sensing relationship with the magnet mounted to the center portion of the rotor, the rotary sensor configured to be responsive to rotation of the magnet for generating a signal, and
an electronic device comprising a circuit board and electronics mounted on the circuit board; and
a brake actuator configured to apply brake to the wheel or the rotor,
wherein the electronic device configured to control the in-wheel motor and the brake actuator is positioned in an inner cavity formed in the stator.
2. The vehicle wheel assembly of claim 1 , further comprising:
two-phase dielectric material; and
one or more covers coupled with the stator to form a hermetic enclosure, wherein the electronic device and the two-phase dielectric material are contained in the hermetic enclosure formed by a wall of the stator and the one or more covers coupled with stator, and the two-phase dielectric material is in contact with the wall of the stator and the electronic device so that the two-phase dielectric material changes temperature of the stator and the electronic device by transitioning between a liquid phase and a gaseous phase.
3. The vehicle wheel assembly of claim 2 , further comprising a wire electrically connecting the circuit board contained within the hermetic enclosure and the rotary sensor disposed outside the hermetic enclosure so that an electronic control unit mounted on the circuit board receives the signal generated by the rotary sensor.
4. The vehicle wheel assembly of claim 1 , wherein the electronics mounted on the circuit board comprise a single electronic control unit configured to control both the in-wheel motor and the brake actuator.
5. The vehicle wheel assembly of claim 1 , wherein the rotary sensor and the magnet of the rotor mounted to the center portion of the rotor are arranged to be collinear with the rotation axis of the wheel.
6. The vehicle wheel assembly of claim 1 , wherein the magnet of the rotor mounted to the center portion of the rotor and the rotary sensor are disposed between the bearing assembly and a vehicle.
7. The vehicle wheel assembly of claim 1 , wherein:
at least a part of the center portion of the rotor, which is coupled with the bearing assembly and the magnet is mounted to, is positioned inside the inner cavity of the stator, and
other magnets included in the rotor radially surround an outer surface of the stator.
8. A vehicle wheel assembly comprising,
a wheel for mounting a tire thereon and having an inner space, and
an in-wheel motor mounted in the inner space of the wheel and configured to drivingly rotate the wheel, the in-wheel motor comprising:
a rotor connected to the wheel, wherein a magnet is mounted to a center portion of the rotor rotatably coupled with a bearing assembly and arranged at a rotation axis of the wheel;
a stator configured to drive the rotor, wherein the rotor is configured to be rotatable relative to the stator, and
a rotary sensor disposed in sensing relationship with the magnet mounted to the center portion of the rotor, the rotary sensor configured to be responsive to rotation of the magnet for generating a signal,
wherein the electronic device configured to control the in-wheel motor and a brake actuator configured to apply brake to the wheel or the rotor is positioned in an inner cavity formed in the stator.
9. The vehicle wheel assembly of claim 8 , wherein the rotary sensor and the magnet of the rotor mounted to the center portion of the rotor are arranged to be collinear with the rotation axis of the wheel.
10. The vehicle wheel assembly of claim 8 , wherein the magnet is mounted to a distal end of the center portion of the rotor.
11. The vehicle wheel assembly of claim 8 , wherein the rotary sensor and the magnet of the rotor mounted to the center portion of the rotor are disposed between the bearing assembly and a vehicle frame or body.
12. The vehicle wheel assembly of claim 8 , wherein:
at least a part of the center portion of the rotor, which is coupled with the bearing assembly and the magnet is mounted to, is positioned inside an inner cavity of the stator, and
other magnets included in the rotor radially surround an outer surface of the stator.
13. The vehicle wheel assembly of claim 8 , further comprising:
two-phase dielectric material;
an electronic device comprising a circuit board and electronics mounted on the circuit board; and
one or more covers coupled with the stator to form a hermetic enclosure, wherein the electronic device and the two-phase dielectric material are contained in the hermetic enclosure formed by a wall of the stator and the one or more covers coupled with stator, and the two-phase dielectric material is in contact with the wall of the stator and the electronic device so that the two-phase dielectric material changes temperature of the stator and the electronic device by transitioning between a liquid phase and a gaseous phase.
14. The vehicle wheel assembly of claim 13 , further comprising a wire electrically connecting the circuit board contained within the hermetic enclosure and the rotary sensor disposed outside the hermetic enclosure so that an electronic control unit mounted on the circuit board receives the signal generated by the rotary sensor.
15. A vehicle wheel assembly comprising,
a wheel for mounting a tire thereon and having an inner space, and
an in-wheel motor mounted in the inner space of the wheel and configured to drivingly rotate the wheel, the in-wheel motor comprising:
a rotor connected to the wheel,
a stator configured to drive the rotor, wherein the rotor is configured to be rotatable relative to the stator, and
an electronic device comprising a circuit board and electronics mounted on the circuit board; and
a brake actuator configured to apply brake to the wheel or the rotor,
wherein the electronic device configured to control the in-wheel motor and the brake actuator is positioned in an inner cavity formed in the stator.
16. The vehicle wheel assembly of claim 15 , wherein the electronics of the electronic device positioned in the inner cavity formed in the stator comprise a single electronic control unit configured to control both the in-wheel motor and the brake actuator.
17. The vehicle wheel assembly of claim 15 , wherein the electronics of the electronic device positioned in the inner cavity formed in the stator comprise:
a first switch module configured to control current supplied to conductors of the stator,
a second switch module configured to control power supplied to the brake actuator, and
a single electronic control unit configured to control the first switch module for the stator and the second switch module the brake actuator.
18. The vehicle wheel assembly of claim 15 , further comprising:
two-phase dielectric material; and
one or more covers coupled with the stator to form a hermetic enclosure, wherein the electronic device and the two-phase dielectric material are contained in the hermetic enclosure formed by a wall of the stator and the one or more covers coupled with stator, and the two-phase dielectric material is in contact with the wall of the stator and the electronic device so that the two-phase dielectric material changes temperature of the stator and the electronic device by transitioning between a liquid phase and a gaseous phase.
19. The vehicle wheel assembly of claim 18 , further comprising a wire electrically connecting the circuit board contained within the hermetic enclosure and the brake actuator disposed outside the hermetic enclosure so that a single electronic control unit mounted on the circuit board controls the brake actuator.
20. The vehicle wheel assembly of claim 1 , wherein the in-wheel motor is configured to have 48 stator slots and 40 rotor poles.