Electro mechanical brake and electrical actuator thereof
The present invention provides an electro mechanical brake ( 1 ) comprising an electrical actuator ( 2 ) which can simplify the structure of the electro mechanical brake ( 1 ) by integrating a control module ( 120 ) into a motor housing ( 11 ). The electrical actuator ( 2 ) may comprise a motor housing ( 11 ), a motor ( 110 ) provided inside the motor housing ( 11 ), and a control module ( 120 ) for controlling the motor ( 110 ), wherein the control module ( 120 ) is inside the motor housing ( 11 ).
1. An electrical actuator for an electro mechanical brake, comprising:
a motor housing;
a motor provided inside the motor housing;
a control module for controlling the motor, wherein the control module is inside the motor housing, the control module comprising at least a first printed circuit board provided with a control circuit for controlling the motor, a support element for holding the at least first printed circuit board, and wherein the at least first printed circuit board and the support element each have an annular shape with a center through-hole through which a drive shaft of the motor may be extended; and
an electromagnetic brake fixed on the support element, wherein the electromagnetic brake is configured to generate a brake torque to stop the rotation of the drive shaft of the motor.
2. The electrical actuator according to claim 1 , wherein:
the control module is attached to the motor housing.
3. The electrical actuator according to claim 2 , wherein:
the at least first printed circuit board further comprises a power management circuit for managing power to the motor.
4. The electrical actuator according to claim 3 , wherein:
the at least first printed circuit board is fixed to one side of the support element.
5. The electrical actuator according to claim 1 , wherein:
the control module further comprises at least a second printed circuit board configured to manage power supply for the motor; and the support element is configured to hold at least the first and second printed circuit board.
6. The electrical actuator according to claim 5 , wherein:
the at least first and second printed circuit board are stacked and fixed to one side of the support element.
7. The electrical actuator according to claim 5 , wherein:
the at least first and second printed circuit board are fixed to opposite sides of the support element.
8. The electrical actuator according to claim 5 , wherein:
the second printed circuit board has an annular shape with a center through-hole through which the drive shaft of the motor may be extended.
9. The electrical actuator according to claim 5 , wherein:
the second printed circuit board and the support element have an annular shape with a center through-hole through which the drive shaft of the motor may be extended.
10. The electrical actuator according to claim 9 , wherein:
the support element is a flat plate.
11. The electrical actuator according to claim 9 , wherein:
the support element has an annular projection that projects from the center through-hole for holding and fixing a bearing therein.
12. The electrical actuator according to claim 1 , wherein:
the control module further comprises at least one capacitor connected to at least one printed circuit board.
13. The electrical actuator according to claim 12 , wherein:
the electrical actuator further comprises a side cover for covering a side of the motor housing.
14. The electrical actuator according to claim 13 , wherein:
the at least one capacitor is attached to the side cover.
15. The electrical actuator according to claim 12 , wherein:
the at least one capacitor is configured as a separate assembly attached to at least one printed circuit board.
16. The electrical actuator according to claim 5 , wherein:
the first printed circuit board is electrically connected to the second printed circuit board via board-to-board connectors, cables or busbars.
17. The electrical actuator according to claim 4 , wherein;
the support element is integral with the motor housing.
18. The electrical actuator according to claim 5 , wherein:
the support element is integral with the motor housing.
19. The electrical actuator according to claim 17 , wherein:
the support element is a flange.
20. The electrical actuator according to claim 18 , wherein:
the support element is a flange.
21. The electrical actuator according to claim 4 , wherein:
the support element is a separate element fixed to the motor housing.
22. The electrical actuator according to claim 5 , wherein:
the support element is a separate element fixed to the motor housing.
23. The electrical actuator according to claim 4 , wherein:
the support element is configured for cooling components on a printed circuit board.
24. The electrical actuator according to claim 5 , wherein;
the support element is configured for cooling components on a printed circuit board.
25. The electrical actuator according to claim 23 , wherein:
the support element is made from a thermally conductive metal.
26. The electrical actuator according to claim 24 , wherein:
the support element is made from a thermally conductive metal.
27. The electrical actuator according to claim 13 , wherein:
the side cover has an annular projection for guiding the drive shaft of the motor.
28. The electrical actuator according to claim 1 , wherein:
the motor housing has a hollow cylindrical shape.
29. The electrical actuator according to claim 1 , wherein:
the motor housing is made from a thermally conductive metal.
30. The electrical actuator according to claim 1 , wherein:
the motor housing includes at least one cable channel thereon.
31. The electrical actuator according to claim 13 , wherein:
the side cover includes at least one hole.
32. An electro mechanical brake, comprising:
an electrical actuator according to claim 1 , and
a mechanical brake mechanism directly or indirectly driven by the motor.
33. The electro mechanical brake according to claim 32 , wherein:
the mechanical brake mechanism is arranged within a drum brake.
34. The electro mechanical brake according to claim 32 , wherein:
the mechanical brake mechanism is arranged within a disc brake caliper.
35. The electro mechanical brake according to claim 32 , further comprising:
a transmission unit provided between the mechanical brake mechanism and the electrical actuator, wherein the mechanical brake mechanism is driven by the transmission unit.
36. The electro mechanical brake according to claim 35 , wherein;
the transmission unit comprises gears.
37. The electro mechanical brake according to claim 36 , wherein:
the gears are planet gears.