High-precision rod-shaped motor
By employing magnetic conductive elements and alternating cylindrical magnet assemblies in a rod-shaped motor, combined with a magnetic encoder for position and speed detection, the problem of magnetic encoders being affected by strong magnets or high temperatures is solved, achieving accurate detection and cost reduction, while protecting the normal operation of the magnetorheological vibration damper.
Patent Information
- Application Number
- CN202522081315.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-09-28
- Publication Date
- 2025-11-28
- Estimated Expiration
- 2035-09-28
AI Technical Summary
When using existing high-precision rod motors for speed and position detection, magnetic encoders are easily affected by strong magnets or high temperatures, while optical encoders have poor resistance to contamination. Furthermore, the magnetic field of the magnetic encoder can affect the magnetorheological damper, leading to problems with detection accuracy and device reliability.
Design a high-precision rod-shaped motor that uses magnetic conductive parts and alternating cylindrical magnet assemblies, combined with a magnetic encoder for position and speed detection, to avoid the influence of the magnetic field on the magnetorheological vibration damper, and to ensure accurate positioning and assembly of the magnets through positioning slots and positioning pins.
It achieves precise speed and position detection, improves anti-interference capability, optimizes assembly process, and reduces costs, while protecting the normal operation of magnetorheological vibration dampers.
Smart Images
Figure CN223613176U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to motor technical field especially relates to a high accuracy bar -like motor. BACKGROUND
[0002] At present, more and more cars use high-precision bar-shaped motor as automobile shock absorber motor, in order to improve the damping effect, the bar-shaped motor of automobile damping in the field is often integrated with magneto-rheological damper. Magneto-rheological damper is a kind of intelligent damping device that realizes adjustable damping by using the characteristics of magneto-rheological fluid (MRF). In the field, high-precision bar-shaped motor mostly uses magnetic encoder, magnetic grid encoder or optical grid encoder to detect speed and position. The disadvantage of magnetic grid encoder is that it needs to match magnetic grid ruler, and the magnetic grid ruler is easy to be damaged by strong magnetism or high temperature, which leads to the failure of the encoder. The disadvantage of optical grid encoder is that it needs to match optical grid ruler, and the optical grid ruler has poor anti-pollution ability, and fingerprints or dust on the ruler surface will affect the normal work of the encoder. The disadvantage of using magnetic encoder is that the magnetic field of the magnet used by the magnetic encoder will affect the magneto-rheological damper in the motor. SUMMARY
[0003] The technical problem to be solved by the embodiment of the utility model is to provide a high-precision bar-shaped motor to realize accurate detection of speed and position and avoid affecting the magneto-rheological damper in the motor.
[0004] In order to solve the above technical problems, the embodiment of the utility model provides a high-precision bar-shaped motor, which comprises a rotor, a stator and a magneto-rheological damper, the rotor is integrated with a magnet assembly, the magnet assembly comprises a magnetic conducting piece and a plurality of magnets arranged correspondingly on the outer side of the magnetic conducting piece, the plurality of magnets are arranged periodically and alternately along the axial direction of the rotor, and the stator is provided with a magnetic encoder for displacement of the rotor.
[0005] Further, the magnet assembly has two groups, and the magnets of the two groups of magnet assemblies are staggered at the alternate positions.
[0006] Further, the number of magnets of the two groups of magnet assemblies is different, and the magnetic periods are different.
[0007] Further, the magnet is cylindrical.
[0008] Further, the magnetic conducting piece is provided with a positioning groove, and the plurality of magnets are arranged in the positioning groove, and the cross section of the positioning groove is semicircular.
[0009] Further, the magnet assembly further comprises a positioning pin, and the top inner side of the magnetic conducting piece is provided with a positioning groove correspondingly.
[0010] The utility model discloses beneficial effect is: the utility model discloses utilize the magnetic member and isolate the magnetic field of magnet to the magneto rheological fluid position of magneto rheological damper, avoid the influence to magneto rheological damper, the utility model discloses through the magnetic encoder detection periodicity and alternate arrangement's magnetic field change of magnet, realize the rotor position feedback, improve the anti -interference ability simultaneously, optimize the assembly technology, can also reduce the cost. BRIEF DESCRIPTION OF DRAWINGS
[0011] Figure 1 It is the perspective view of the high-precision bar motor of the utility model embodiment.
[0012] Figure 2 It is the plan view of the high-precision bar motor of the utility model embodiment.
[0013] Figure 3 It is Figure 2 The sectional view at D-D in it.
[0014] Figure 4 It is Figure 3 The enlarged view at A in it.
[0015] Figure 5 It is the perspective view of the 2 groups of magnet assemblies in the high-precision bar motor of the utility model embodiment.
[0016] Figure 6 It is the perspective view of the magnetic member of the utility model embodiment.
[0017] BRIEF DESCRIPTION OF DRAWINGS
[0018] 1, rotor, 2, stator, 3, magnetic encoder, 4, magnetic member, 5, magnet, 6, positioning groove, 7, positioning pin, 8, positioning groove, 9, magneto rheological damper. DETAILED DESCRIPTION
[0019] It should be noted that the embodiments in the present application and the features in the embodiments can be combined with each other without conflict, and the utility model will be further explained in detail in combination with the drawings and specific embodiments.
[0020] In the embodiment of the utility model, if there is a directional indication (such as up, down, left, right, front, back, etc.), it is only used to explain the relative position relationship, movement condition, etc. between components in a certain specific posture (as shown in the drawings), if the specific posture changes, the directional indication also changes accordingly.
[0021] In addition, in the utility model, if the description of "first", "second" and the like is only used for the purpose of description, and cannot be understood as indicating or implying the relative importance of the indicated technical features or implicitly indicating the number of the indicated technical features. Therefore, the features limited by "first", "second" can explicitly or implicitly include at least one feature.
[0022] Please refer to Figures 1-6 The high-precision bar-shaped motor comprises a rotor, a stator and a magneto-rheological damper. The magneto-rheological damper is a common knowledge, which generally comprises a magneto-rheological liquid cavity and a magneto-rheological rod. The magneto-rheological liquid cavity is filled with magneto-rheological liquid.
[0023] The rotor is integrated with a magnet assembly (preferably embedded on the inner wall of the rotor). The magnet assembly comprises a magnetic conducting piece (generally made of magnetic conducting material, such as 45 steel) and a plurality of magnets arranged at the outer side of the magnetic conducting piece (the side away from the axis of the rotor is the outer side). The plurality of magnets are periodically and alternately stacked along the axial direction of the rotor, and the stator is correspondingly provided with a magnetic encoder for displacement of the rotor. The magnetic encoder detects the S\N pole change of the magnet to realize the position and speed detection of the rotor.
[0024] As an embodiment, the magnet assembly has two groups, and the two groups of magnet assemblies are arranged side by side, and the magnets of the two groups of magnet assemblies are staggered at the alternation. The number of magnets of the two groups of magnet assemblies is different, and the magnetic period is different (i.e. the resolution is different). The two groups of magnet assemblies can further improve the detection accuracy, thereby facilitating the automobile to reduce the shock more accurately.
[0025] As an embodiment, the magnet is cylindrical, which facilitates assembly, i.e. drilling a circular hole on the inner wall of the rotor, and then stacking the magnetic conducting piece and the magnet to realize rapid assembly.
[0026] As an embodiment, the magnetic conducting piece is provided with a positioning groove, and the plurality of magnets are arranged in the positioning groove, and the cross section of the positioning groove is semicircular. The positioning groove positions the stacked magnet, which facilitates rapid and accurate assembly of the magnet.
[0027] As an embodiment, the magnet assembly further comprises a positioning pin, and the top inner side (the side towards the axis of the rotor is the inner side) of the magnetic conducting piece is correspondingly provided with a positioning groove, and the positioning pin is embedded in the positioning groove. The positioning pin facilitates radial positioning of the magnetic conducting piece, prevents rotation of the magnetic conducting piece, and ensures the orientation and position of the magnet; the magnetic conducting piece is clamped by the fixing pin and fixed on the rotor, which facilitates assembly.
[0028] Although the embodiments of the utility model have been shown and described, it can be understood by those skilled in the art that various changes, modifications, replacements and variations can be made to these embodiments without departing from the principles and spirits of the utility model, and the scope of the utility model is defined by the appended claims and their equivalent scope.
Claims
1. A high-precision bar motor comprising a mover, a stator, and a magnetorheological damper, characterized by, The mover is integrated with a magnet assembly, the magnet assembly includes a magnetic conducting piece and a plurality of magnets arranged on the outer side of the magnetic conducting piece, the plurality of magnets are arranged in an axial periodic alternating stack, and a magnetic encoder for displacement of the mover is arranged on the stator.
2. The high-precision bar motor according to claim 1, wherein The magnet assembly has two groups, and the magnets of the two groups of magnet assemblies are staggered.
3. The high-precision bar motor according to claim 2, wherein The number of magnets of the two groups of magnet assemblies is different, and the magnetic periods are different.
4. The high-precision bar motor according to claim 1, wherein The magnet is a cylinder.
5. The high-precision bar motor according to claim 4, wherein The magnetic conducting piece is provided with a positioning groove, and the plurality of magnets are arranged in the positioning groove, and the cross section of the positioning groove is semicircular.
6. The high-precision bar motor according to claim 1, wherein The magnet assembly further includes a positioning pin, and the inner side of the top of the magnetic conducting piece is provided with a positioning groove.