CN211391439U - Electric power steering system and power-assisted electric device thereof - Google Patents
Electric power steering system and power-assisted electric device thereof Download PDFInfo
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- CN211391439U CN211391439U CN201921450270.7U CN201921450270U CN211391439U CN 211391439 U CN211391439 U CN 211391439U CN 201921450270 U CN201921450270 U CN 201921450270U CN 211391439 U CN211391439 U CN 211391439U
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Abstract
The utility model provides an electric power steering system and helping hand electric actuator thereof, helping hand electric actuator install in electric power steering system, helping hand electric actuator includes: an electric machine, the electric machine comprising: a motor shaft; the motor rotor is arranged on the motor shaft; the induction part is arranged on the motor shaft and is a stamped metal sheet; a motor stator; and the controller is axially integrated in the motor and is arranged on a motor shaft of the motor, and the controller comprises a sensing circuit board for sensing the sensing part to detect the position of the motor rotor. The utility model provides an electric power steering system and helping hand electric actuator thereof, simple structure just can realize electric motor rotor's position detection.
Description
Technical Field
The utility model relates to an electric power steering system especially relates to an electric power steering power assisting device and helping hand electric actuator thereof.
Background
The existing electric steering power unit structure design usually takes a motor as a center, and has three structures, namely side mounting, rear end mounting and front end mounting. However, the side mounting method has high material cost and large radial size of the power unit, which is not favorable for the whole vehicle arrangement and the miniaturization design of the power unit. The rear end mounting is bulky at the end of the motor, which also has a negative impact on the overall vehicle layout and the miniaturized design of the power unit.
Compared with the side mounting and rear mounting modes, the electric steering power unit structure mounted at the front end is more convenient for the whole vehicle arrangement and the miniaturization design of the power unit.
In the structural design of the front-end-mounted electric power steering unit, the position sensing of the motor rotor generally has three modes:
1) the sensing component of the rotary-change type position sensing is a silicon steel iron core arranged on an electrode shaft, and the sensor is a rotary-change coil and a decoding circuit. However, the material cost and the application cost of the resolver type sensor are high;
2) the induction component of the Hall switch type position sensing is a multi-rail multi-level magnet on the surface, and the sensor is 5 to 7 Hall switch chips. However, hall switch position sensing has high requirements for magnets and mounting, and magnetic fields in components have a large influence on hall switch position sensing;
3) the magnetic resistance type position sensing part is a strong magnetic magnet, and the sensor is a plurality of magnetic resistance type sensing chips. However, magnetoresistive position sensing is costly and the magnetic field within the components has a large impact on magnetoresistive position sensing.
Therefore, on the premise of ensuring the position sensing reliability of the motor rotor, the power unit with both cost and whole vehicle arrangement is provided, which is a problem to be solved urgently in the field.
SUMMERY OF THE UTILITY MODEL
The utility model discloses a overcome the defect that above-mentioned correlation technique exists, provide an electric power steering helping hand system and helping hand electric actuator thereof, the technical scheme that this paper describes overcomes one or more problems that lead to because correlation technique's restriction and defect to a certain extent at least.
According to the utility model discloses an aspect provides a helping hand electric actuator installs in electronic power steering system, helping hand electric actuator includes:
an electric machine, the electric machine comprising:
a motor shaft;
the motor rotor is arranged on the motor shaft;
the induction part is arranged on the motor shaft and is a stamped metal sheet;
a motor stator;
and the controller is axially integrated in the motor and is arranged on a motor shaft of the motor, and the controller comprises a sensing circuit board for sensing the sensing part to detect the position of the motor rotor.
In one or more examples, a plane of the sensing circuit board is perpendicular to the motor shaft.
In one or more examples, the sensing circuit board is located on a side of the inductive component facing away from the motor stator.
In one or more examples, further comprising:
the controller shell is provided with a first shaft hole for the motor shaft to pass through, the controller shell is provided with an accommodating space for accommodating the controller, and the controller shell is back to one side of the accommodating space and is connected with the motor stator.
In one or more examples, further comprising:
and the controller shell cover covers the controller shell so as to enable the controller to be sealed between the controller shell and the controller shell cover.
In one or more examples, further comprising:
and the coupling is arranged at one end of the motor shaft, which faces away from the motor stator, and at least part of the coupling is exposed out of the controller shell cover.
In one or more examples, the sensing circuit board includes:
one or more excitation circuits for generating an excitation signal;
one or more receive circuits to receive the feedback signal.
In one or more examples, the sensing circuit board is provided with a second shaft hole for the motor shaft to pass through, the excitation circuit and the receiving circuit are annular coils surrounding the shaft hole, and the excitation circuit, the receiving coil and the shaft hole are coaxial.
In one or more examples, the sensing circuit board includes one excitation circuit, the sensing circuit board includes one receiving circuit, and the second shaft hole, the receiving circuit, and the excitation circuit are sequentially located from a center of the second shaft hole to an outside.
In one or more examples, a maximum radius of the receiving circuit is not greater than a maximum radius of the inductive component.
According to the utility model discloses an on the other hand still provides an electric power steering system, include:
a booster including the booster electric device as described above; and
a steering gear.
Compared with the prior art, the utility model discloses an advantage includes at least:
the utility model discloses an integrate in helping hand electric actuator's controller and install the punching press sheetmetal on the motor shaft as response part to the realization detects helping hand electric actuator's electric motor rotor's position, the utility model provides a helping hand electric actuator is under the prerequisite of guaranteeing electric motor rotor position sensing reliability for helping hand electric actuator simple structure, the cost is lower, does benefit to whole car and arranges and miniaturized design.
Drawings
The above and other features and advantages of the present invention will become more apparent by describing in detail exemplary embodiments thereof with reference to the attached drawings.
Fig. 1 shows a schematic view of an electric power steering system according to an embodiment of the present invention.
Fig. 2 shows an assembly view of an electric power assist device according to an embodiment of the present invention.
Fig. 3 shows an exploded view of a part of an electric power assist device according to an embodiment of the present invention.
Fig. 4 shows a schematic diagram of a controller according to an embodiment of the invention.
Detailed Description
Example embodiments will now be described more fully with reference to the accompanying drawings. Example embodiments may, however, be embodied in many different forms and should not be construed as limited to the examples set forth herein; rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the concept of example embodiments to those skilled in the art. The described features, structures, or characteristics may be combined in any suitable manner in one or more embodiments.
Furthermore, the drawings are merely schematic illustrations of the present invention, which are not necessarily drawn to scale. The same reference numerals in the drawings denote the same or similar parts, and thus their repetitive description will be omitted.
Reference is now made to the drawings, wherein the technical solutions will be described with reference to specific embodiments, without being limited to the same embodiments. Fig. 1 shows a schematic view of an electric power steering system according to an embodiment of the present invention. The electric power steering system may include, for example, a steering wheel 110, a torque sensor 130 (the torque sensor 130 includes a steering shaft 120), a booster (including, for example, an assist motor 140 and a decelerator 150), and a steering gear 160.
When a driver steers the steering wheel 110, the torque sensor 130 detects the steering torque of the driver, the vehicle speed sensor detects the driving vehicle speed of the vehicle, the controller of the power motor 140 determines the control current of the power motor 140 according to the steering torque and the driving vehicle speed of the vehicle, and controls the torque and the rotating direction of the power motor 140 based on the control current, the motor torque is amplified by the motor reducer 150 and acts on the steering shaft 120 as the motor assist torque, and the steering torque of the steering wheel 110 and the motor assist torque of the power booster act on the steering gear 160 together to drive the tire 170 to rotate, thereby realizing the steering function.
The electric power assisting device according to an embodiment of the present invention will be described with reference to fig. 2 and 3. Fig. 2 shows an assembly view of an electric power assist device according to an embodiment of the present invention. Fig. 3 shows an exploded view of a part of an electric power assist device according to an embodiment of the present invention. The assist electric device 140 is mounted on the electric power steering system shown in fig. 1.
The power-assisted electric device 140 includes a motor and a controller 17. The motor comprises a motor shaft 19, a motor rotor, a motor stator 23 and an inductive component 15. The motor rotor is mounted on the motor shaft 19. The motor stator 23 is located at an end of the motor shaft 19 facing away from the inductive component 15. The inductive component 15 is mounted on the motor shaft 19. The inductive component 15 is a stamped metal sheet. The controller 17 is axially integrated in the motor and is mounted on the motor shaft 19 of the motor. The controller 17 includes a sensing circuit board for sensing the sensing part 15 to detect the position of the motor rotor. Therefore, the position of the motor rotor can be obtained by sensing the sensing component 15 and the sensing circuit board, and only the stamped metal sheet and the sensing circuit board are needed, so that the cost is low.
In one or more examples of the present invention, the plane of the sensing circuit board is perpendicular to the motor shaft 19. At the same time, the plane of the punched metal sheet of the sensing part 15 is also perpendicular to the motor shaft 19 so that the plane of the sensing circuit board is parallel to the plane of the punched metal sheet of the sensing part 15, thereby improving the accuracy and precision of position sensing.
In one or more examples of the present invention, after the installation is completed, the sensing part 15 is located on the back surface of the sensing circuit board toward one side of the motor stator 23.
In one or more examples of the present invention, the power-assisted electric device further includes a controller housing 21. The controller case 21 is provided with a first shaft hole 211 through which the motor shaft 19 passes. The controller housing 21 has an accommodating space for accommodating the controller 17, and one side of the controller housing 21 facing away from the accommodating space is connected to the motor stator 23.
In one or more examples of the present invention, the power assist electric device further includes a controller case cover 13. The controller shell cover 13 covers the controller shell 21, so that the controller 17 is enclosed between the controller shell 21 and the controller shell cover 13, thereby protecting the controller 17 and adjusting the appearance of the controller 17, and facilitating the arrangement of the whole vehicle.
In one or more examples of the present invention, the electric assist device further comprises a coupling 11. The coupling 11 is mounted on the end of the motor shaft 19 opposite to the motor stator 23 and is at least partially exposed outside the controller cover 13 to connect with other shafts of the electric power steering system so as to transmit the rotation assistance provided by the power assisting electric device.
The controller 17 provided by the present invention is described below with reference to fig. 4. Fig. 4 shows a schematic diagram of a controller according to an embodiment of the invention.
The sensing circuit board includes one or more excitation circuits 175 and one or more receiving circuits 173. In the embodiment shown in fig. 4, the sensing circuit board includes one excitation circuit and one receiving circuit, but the present invention is not limited thereto. The excitation circuit 175 is used to generate an excitation signal. The receiving circuit 173 is used for receiving the feedback signal. The excitation signal generates a feedback signal via the rotation of the sensing part, and the generated feedback signal is received by the receiving circuit 173, so that the excitation circuit 175 and the receiving circuit 173 jointly sense the rotation of the sensing part to obtain the rotation angle of the motor rotor, thereby determining the position of the motor rotor. The sensing circuit board may further include, for example, a circuit chip for converting the angle signal and the electric signal.
In one or more examples of the present invention, the sensing circuit board is provided with a second shaft hole 171 through which the motor shaft passes, the excitation circuit 175 and the receiving circuit 173 are annular coils surrounding the second shaft hole 171, and the excitation circuit 175, the receiving coil 173 and the second shaft hole 171 are coaxial. Thereby, the accuracy of the detected angle signal can be improved.
In one or more examples of the present invention, the second shaft hole 171, the receiving circuit 173, and the exciting circuit 175 are sequentially from the center O of the second shaft hole 171 to the outside. A gap is provided between the receiving circuit 173 and the edge of the second shaft hole 171. There is a gap between the receive circuit 173 and the drive circuit 175. Thus, signal interference between circuits is prevented, and transmission of an excitation signal and reception of a feedback signal are facilitated.
In one or more examples of the present invention, the maximum radius of the receiving circuit 173 is not greater than the maximum radius of the sensing component (e.g., 15 in fig. 3). Therefore, when the rotor rotates, the projection of the metal target on the induction component completely covers the receiving circuit, and the sensed signal energy is maximized.
The above are merely exemplary embodiments of the present invention, and the present invention is not limited thereto, and the position, the number, and the shape of the components can be changed without departing from the concept of the present invention, and the increase and decrease of the components are all within the protection scope of the present invention.
Compared with the prior art, the utility model discloses an advantage includes at least:
the utility model discloses an integrate in helping hand electric actuator's controller and install the punching press sheetmetal on the motor shaft as response part to the realization detects helping hand electric actuator's electric motor rotor's position, the utility model provides a helping hand electric actuator is under the prerequisite of guaranteeing electric motor rotor position sensing reliability for helping hand electric actuator simple structure, the cost is lower, does benefit to whole car and arranges and miniaturized design.
Other embodiments of the invention will be apparent to those skilled in the art from consideration of the specification and practice of the invention disclosed herein. This application is intended to cover any variations, uses, or adaptations of the invention following, in general, the principles of the invention and including such departures from the present disclosure as come within known or customary practice within the art to which the invention pertains. It is intended that the specification and examples be considered as exemplary only, with a true scope and spirit of the invention being indicated by the following claims.
Claims (11)
1. An electric power assist device mounted to an electric power steering system, the electric power assist device comprising:
an electric machine, the electric machine comprising:
a motor shaft;
the motor rotor is arranged on the motor shaft;
the induction part is arranged on the motor shaft and is a stamped metal sheet;
a motor stator;
and the controller is axially integrated in the motor and is arranged on a motor shaft of the motor, and the controller comprises a sensing circuit board for sensing the sensing part to detect the position of the motor rotor.
2. An electric assist as set forth in claim 1 wherein a plane of said sensing circuit board is perpendicular to said motor shaft.
3. An electric assist as set forth in claim 1 wherein said sensing circuit board is located on a side of said induction member facing away from said motor stator.
4. The power assist electric device of claim 1, further comprising:
the controller shell is provided with a first shaft hole for the motor shaft to pass through, the controller shell is provided with an accommodating space for accommodating the controller, and the controller shell is back to one side of the accommodating space and is connected with the motor stator.
5. The booster electric device of claim 4, further comprising:
and the controller shell cover covers the controller shell so as to enable the controller to be sealed between the controller shell and the controller shell cover.
6. An electric assist as claimed in claim 5, further comprising:
and the coupling is arranged at one end of the motor shaft, which faces away from the motor stator, and at least part of the coupling is exposed out of the controller shell cover.
7. The power assist electric device of claim 1, wherein the sensing circuit board comprises:
one or more excitation circuits for generating an excitation signal;
one or more receive circuits to receive the feedback signal.
8. An electric assist as set forth in claim 7 wherein said sensing circuit board is provided with a second axial bore through which said motor shaft passes, said excitation circuit and said receiver circuit being annular coils surrounding said axial bore, said excitation circuit, said receiver circuit and said axial bore being coaxial.
9. The electric assist device of claim 8, wherein the sensing circuit board includes one excitation circuit, the sensing circuit board includes one receiving circuit, and the second shaft hole, the receiving circuit, and the excitation circuit are arranged in sequence from a center of the second shaft hole to an outside.
10. An electric assist as set forth in claim 8 wherein said maximum radius of said receiver circuit is no greater than the maximum radius of said inductive member.
11. An electric power steering system characterized by comprising:
a booster including the booster electric device according to any one of claims 1 to 10; and
a steering gear.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921450270.7U CN211391439U (en) | 2019-09-03 | 2019-09-03 | Electric power steering system and power-assisted electric device thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921450270.7U CN211391439U (en) | 2019-09-03 | 2019-09-03 | Electric power steering system and power-assisted electric device thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN211391439U true CN211391439U (en) | 2020-09-01 |
Family
ID=72223128
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201921450270.7U Active CN211391439U (en) | 2019-09-03 | 2019-09-03 | Electric power steering system and power-assisted electric device thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN211391439U (en) |
-
2019
- 2019-09-03 CN CN201921450270.7U patent/CN211391439U/en active Active
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