Hollow actuator
By designing a hollow actuator in the electric power steering system, using an external rotor-type rotary transformer and a magnetic sensor gear structure with built-in rotor, the motor miniaturization and control accuracy problems are solved, and the actuator is flattened and high environmental resistance is achieved.
Patent Information
- Application Number
- CN202411756222.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-03
- Publication Date
- 2025-03-11
AI Technical Summary
The motors in existing electric power steering systems are difficult to miniaturize, resulting in an increase in the size of the equipment and the ability to fully utilize its advantages when the actuator length increases, affecting control accuracy and environmental tolerance.
A hollow actuator is designed. By using an external rotor-type rotary transformer and placing the rotor in a magnetic sensor gear, the length of the actuator is reduced and the shape of the actuator is as flat as possible, thereby improving the control accuracy and environmental resistance of the equipment.
The flattening of the actuator profile is achieved, the control accuracy of the equipment is improved, and the environmental resistance of the actuator is improved.
Smart Images
Figure CN119602545A_ABST
Abstract
Description
[0001] Methodology Area
[0002] The invention relates to the technical field of sensors, and in particular to a hollow actuator.
[0003] Background Methods
[0004] In the past, many technical efforts have been made to reduce the size of motors and other actuators. At present, the technology of miniaturizing actuators using rotary transformers as sensors has been widely used. Magnetic shielding is necessary in electric power steering systems. Due to the need to provide magnetic shielding, the motor in the electric power steering device has always been difficult to miniaturize. In view of this, the cover of the motor housing adopts magnetic shielding to reduce the size of the motor. In this case, the cover of the motor housing is made of magnetic material, so it also plays the role of magnetic shielding, so that the size of the motor in the central axis direction can be reduced compared with the case where a magnetic shielding plate is separately provided on the cover. Hollow actuators can be used in robots and various automation equipment to expand the range of motion and make them more slender. However, if the length of the actuator becomes longer, its advantages cannot be fully utilized. On the other hand, in order to improve the control accuracy of the equipment, environmental tolerance must be improved. Therefore, a new type of central control actuator needs to be developed. Summary of the invention
[0005] Purpose of the invention: To solve the above problems, the present invention provides a hollow actuator, which reduces the length of the hollow actuator to make the actuator as flat as possible to improve the control accuracy of the equipment, while also making the actuator have excellent environmental resistance.
[0006] Technical solution: To achieve the above-mentioned purpose, the hollow actuator described in the present invention includes a magnetic sensor, a rotary transformer arranged in the vertical direction of the magnetic sensor, a gear connected to the magnetic sensor, and a rotor arranged inside the gear; the rotary transformer, gear and rotor form a space.
[0007] Furthermore, the hollow actuator axis is located in a horizontal direction.
[0008] Furthermore, the sensor and the rotary transformer are both perpendicular to the hollow actuator axis.
[0009] Furthermore, the space includes a conversion plate.
[0010] Furthermore, the rotary transformer is of an outer rotor type.
[0011] Furthermore, the rotary transformer, the gear and the rotor are each provided with two.
[0012] Furthermore, the rotary transformer, gear and rotor are all symmetrically arranged with respect to the axis of the hollow actuator.
[0013] Furthermore, the magnetic sensor and the rotary transformer are arranged in a direction to form a thin hollow actuator.
[0014] Beneficial effects: Compared with the prior art, the present invention has the following significant effects: by adopting an outer rotor type rotary transformer and arranging the rotor in the magnetic sensor gear to reduce the length of the hollow actuator, the actuator shape is made as flat as possible to improve the control accuracy of the equipment, and at the same time the actuator has excellent environmental resistance. BRIEF DESCRIPTION OF THE DRAWINGS
[0015] Figure 1 It is a schematic diagram of the overall structure of the present invention.
[0016] Figure 2 It is a cross-sectional view of the structure of the traditional central control actuator described in the present invention. DETAILED DESCRIPTION
[0017] The present invention discloses a hollow actuator. Figure 1 to Figure 2 As shown, the hollow actuator provided by the present invention is further described in detail below: the hollow actuator 8 includes a magnetic sensor 1, a rotary transformer 3 arranged in the vertical direction of the magnetic sensor 1, a gear 12 connected to the magnetic sensor 1, a rotor 34 arranged inside the gear 12, a stator 35, a magnetic sensor cover 7, and a conversion plate 9. Among them, the rotary transformer 3, the gear 12 and the rotor 34 form a space S; the axis 2 of the hollow actuator 8 is located in the horizontal direction; the sensor 1 and the rotary transformer 3 are both perpendicular to the hollow actuator axis 2; the space S contains the conversion plate 9 or other accessories; the rotary transformer 3 is an outer rotor type; the rotary transformer 3, the gear 12 and the rotor 34 are each provided with two, and are all symmetrically arranged with the axis of the central control actuator 8, forming a magnetic sensor arrangement structure 10, and the magnetic sensor arrangement structure 10 forms a thin hollow actuator.
[0018] like Figure 2 As shown, in the conventional central control actuator 48, the second magnetic sensor 41 and the second rotary transformer 43 are installed in parallel in the axial direction. The arrangement structure of the magnetic sensors will increase the length of the conventional central control actuator 48. In addition, if a second conversion plate 49 is installed in the conventional central control actuator 48 and the conversion plate is connected to the outside through a cable 40, the length of the conventional central control actuator 48 will inevitably increase.
[0019] The hollow actuator 8 provided by the present invention reduces the length of the central control actuator 8 by setting a magnetic sensor arrangement structure 10, so that the hollow actuator has a flat appearance as much as possible, forming a thin hollow actuator to improve the control accuracy of the equipment, and at the same time making the actuator have excellent environmental resistance.
Claims
1. A hollow actuator, characterized in that: The invention comprises a magnetic sensor (1), a rotary transformer (3) arranged in a vertical direction of the magnetic sensor (1), a gear (12) connected to the magnetic sensor (1), and a rotor (34) arranged inside the gear (12); the rotary transformer (3), the gear (12) and the rotor (34) form a space (S).
2. The hollow actuator according to claim 1, characterized in that: The hollow actuator shaft (2) is located in a horizontal direction.
3. The hollow actuator according to claim 2, characterized in that: The sensor (1) and the rotary transformer (3) are both perpendicular to the hollow actuator shaft (2).
4. The hollow actuator according to claim 1, characterized in that: The space (S) contains a conversion plate (9).
5. The hollow actuator according to claim 1, characterized in that: The rotary transformer (3) is of an outer rotor type.
6. The hollow actuator according to claim 1, characterized in that: The rotary transformer (3), the gear (12) and the rotor (34) are each provided with two.
7. The hollow actuator according to claim 1, characterized in that: The rotary transformer (3), the gear (12) and the rotor (34) are all symmetrically arranged about the axis of the hollow actuator (8).
8. The hollow actuator according to claim 1, characterized in that: The magnetic sensor (1) and the rotary transformer (3) are arranged in a direction to form a thin hollow actuator.