Electromagnetic structure for angle sensor and angle sensor

Abstract

The present application discloses an electromagnetic structure for an angle sensor and an angle sensor, the electromagnetic structure for the angle sensor including: a stator assembly including a stator magnetic core and a stator winding, the stator winding being provided on one side of the stator magnetic core and including a stator excitation winding and a stator angle winding provided in layers, the stator excitation winding being used to connect an external power supply; and a rotor assembly including a rotor magnetic core and a rotor winding, the rotor winding being provided on one side of the rotor magnetic core and located on a side of the stator winding away from the stator magnetic core, an air gap being formed between the stator winding and the rotor winding, the rotor winding including the rotor excitation winding and the rotor angle winding provided in layers and electrically connected to each other.

Description

[Technical Field]

[0001] (CROSS-REFERENCE TO RELATED APPLICATIONS) This application claims priority to Chinese patent application No. 202311812873.8, filed on December 27, 2023, the entire contents of which are incorporated herein by reference.

[0002] The present application relates to the technical field of sensing devices, and in particular to an electromagnetic structure for an angle sensor and an angle sensor. [Background technology]

[0003] Moving systems such as automobiles and robots require sensors that utilize global effects, which can attenuate interference in angle signals caused by mechanical vibrations. However, high-precision sensors require many windings and complex electromagnetic structures, resulting in problems such as large volume, difficulty in fabrication, and high cost. Brushless rotor winding structures are commonly used to detect angles because of their advantages of easy maintenance and high reliability. Sensors using brushless rotor winding structures are more accurate than reluctance resolvers, which perform position detection using changes in air-gap reluctance. However, sensors using brushless rotor winding structures require windings attached to the rotor to generate a magnetic field related to the rotor's position, and therefore require an additional toroidal transformer-like structure to transfer excitation energy to the rotor, resulting in a large sensor volume. Summary of the Invention [Problem to be solved by the invention]

[0004] The main purpose of this application is to propose an electromagnetic structure for angle sensors to solve the problem of large volume of conventional sensors. [Means for solving the problem]

[0005] To achieve the above object, the electromagnetic structure for an angle sensor proposed in this application comprises: a stator assembly including a stator magnetic core and a stator winding, the stator winding being provided on one side of the stator magnetic core, the stator winding including a stator excitation winding and a stator angle winding provided in a stacked manner, the stator excitation winding being used to connect an external power source; a rotor assembly including a rotor magnetic core and a rotor winding, the rotor winding being provided on one side of the rotor magnetic core, the rotor winding being located on a side of the stator winding remote from the stator magnetic core, an air gap being formed between the stator winding and the rotor winding, the rotor winding including a rotor excitation winding and a rotor angle winding that are provided in layers and are electrically connected to each other.

[0006] In one embodiment, the stator excitation winding and the stator angle winding, and the rotor excitation winding and the rotor angle winding are provided on different layers of a circuit board; and / or The stator angle windings include a stator angle sine winding and a stator angle cosine winding, and a phase difference in electrical angle is provided between the stator angle sine winding and the stator angle cosine winding.

[0007] In one embodiment, the stator excitation winding includes a first excitation winding, a second excitation winding, and a first circuit board, the first excitation winding and the second excitation winding are both provided on the first circuit board, the first circuit board is provided with a first connection hole and a first electrical connection portion, one end of the first excitation winding is connected to the first electrical connection portion, the other end of the first excitation winding is electrically connected to one end of the second excitation winding via the first connection hole, the other end of the second excitation winding is connected to the first electrical connection portion, and the first electrical connection portion is used to connect an external power supply.

[0008] In one embodiment, the stator angle sine winding includes a first angle winding, a second angle winding, and a third circuit board, the first angle winding and the second angle winding are both provided on the third circuit board, the third circuit board is provided with a third connection hole and a third electrical connection portion, the first angle winding is connected to the third electrical connection portion, the first angle winding is electrically connected to the second angle winding through the third connection hole, and the second angle winding is electrically connected to the third electrical connection portion; The stator angle cosine winding includes a third angle winding, a fourth angle winding, and a fifth circuit board, the third angle winding and the fourth angle winding are both provided on the fifth circuit board, the fifth circuit board has a fourth connection hole and a fourth electrical connection portion, the third angle winding is connected to the fourth electrical connection portion, and the third angle winding is electrically connected to the fourth angle winding through the fourth connection hole.

[0009] In one embodiment, the rotor excitation winding includes a third excitation winding, a fourth excitation winding, and a seventh circuit board, the third excitation winding and the fourth excitation winding are both provided on one side surface of the seventh circuit board, the seventh circuit board is provided with a fifth connection hole and a fifth electrical connection portion, one end of the third excitation winding is connected to the fifth electrical connection portion, the other end of the third excitation winding is electrically connected to one end of the fourth excitation winding via the fifth connection hole, the other end of the fourth excitation winding is electrically connected to the fifth electrical connection portion, and the fifth electrical connection portion is electrically connected to the rotor angle winding.

[0010] In one embodiment, the rotor angle winding includes a fifth angle winding, a sixth angle winding, and a ninth circuit board, the fifth angle winding and the sixth angle winding are provided on the ninth circuit board, the ninth circuit board has a seventh connection hole and a seventh electrical connection portion, the fifth angle winding is connected to the seventh electrical connection portion, and the fifth angle winding and the sixth angle winding are electrically connected to the sixth angle winding through the seventh connection hole.

[0011] In one embodiment, the electromagnetic structure for the angle sensor includes M sets of stator excitation windings and N sets of stator angle windings, where M and N are both positive integers, a second angle difference is provided between different stator angle windings, a third angle difference is provided between the first angle winding and the second angle winding, and a fourth angle difference is provided between the third angle winding and the fourth angle winding; the electromagnetic structure for the angle sensor includes P sets of rotor excitation windings and Q sets of rotor angle windings, where P and Q are both positive integers, a fifth angle difference is provided between different rotor angle windings, and a sixth angle difference is provided between the fifth angle winding and the sixth angle winding.

[0012] In one embodiment, the rotor magnetic core and the stator magnetic core are both made of a ferromagnetic material having a magnetic permeability of 100 or more.

[0013] In one embodiment, the stator excitation winding includes an annular winding that goes around from the center to the edge, and the stator angular winding and the rotor angular winding each include two semi-annular windings that are arranged symmetrically about the center.

[0014] Furthermore, the present application proposes an angle sensor including the above-mentioned electromagnetic structure for the angle sensor. [Effects of the Invention]

[0015] The technical solution of this application is a stacked arrangement of a stator magnetic core, a stator excitation winding, a stator angle winding, a rotor excitation winding, and a rotor angle winding. An air gap is formed between the stator winding and the rotor winding. An external power source supplies an excitation current to the stator excitation winding, causing the stator excitation winding to generate an alternating excitation magnetic field in the air gap. This alternating excitation magnetic field is connected to the rotor excitation winding via the stator magnetic core and the rotor magnetic core, generating an induced electromotive force in the rotor excitation winding. However, due to the orthogonality of the electromagnetic structure between the excitation winding and the designed angle winding, even if they are located in the same area, they do not induce back electromotive force. However, because the rotor excitation winding is connected to the rotor angle winding, an alternating current is generated in the rotor angle winding, generating an alternating magnetic field in the air gap, which in turn generates an induced electromotive force in the stator angle winding. The excitation winding, which is made up of the stator excitation winding and the rotor excitation winding, and the angle winding, which is made up of the stator angle winding and the rotor angle winding, share the air gap in one area, which makes the structure of the electromagnetic structure more compact and achieves the purpose of reducing the volume of the entire electromagnetic structure.

[0016] In order to more clearly explain the technical solutions in the embodiments of the present application or the prior art, the following briefly introduces the drawings that need to be used in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present application, and those skilled in the art can also obtain other drawings based on the structures shown in these drawings without any creative effort. [Brief explanation of the drawings]

[0017] [Figure 1] 1 is a schematic diagram of the internal structure of an embodiment of an electromagnetic structure for an angle sensor according to the present application; [Figure 2] 1 is a structural schematic diagram of an embodiment of an electromagnetic structure for an angle sensor according to the present application; [Figure 3] 1 is a structural schematic diagram of a stator excitation winding of an embodiment of an electromagnetic structure for an angle sensor according to the present application. FIG. [Figure 4] 1 is a structural schematic diagram of a stator angle winding of an embodiment of an electromagnetic structure for an angle sensor according to the present application; FIG. [Figure 5] 1 is a structural schematic diagram of a rotor excitation winding of an embodiment of an electromagnetic structure for an angle sensor according to the present application. FIG. [Figure 6] 1 is a structural schematic diagram of a rotor angle winding of an embodiment of an electromagnetic structure for an angle sensor according to the present application; FIG. [Figure 7] 10 is a structural schematic diagram of a rotor angle winding in another embodiment of the electromagnetic structure for an angle sensor according to the present application; FIG. DETAILED DESCRIPTION OF THE INVENTION

[0018] The realization of the object, functional features and advantages of the present application will be further explained in combination with the examples and with reference to the drawings. The technical solutions in the embodiments of the present application will be clearly and completely explained below in conjunction with the drawings in the embodiments of the present application, and it should be apparent that the described embodiments are only some of the embodiments of the present application, not all of the embodiments, and all other embodiments that can be obtained by those skilled in the art based on the embodiments of the present application without any creative effort fall within the scope of protection of the present application.

[0019] In addition, if there is a description of a direction in the examples of the present application (for example, up, down, left, right, front, back, etc.), the description of the direction is used only to explain the relative positional relationship and movement status between each member in a specific posture, and if the specific posture changes, the description of the direction also changes accordingly.

[0020] Furthermore, when a description of "first," "second," etc. appears in an embodiment of the present application, such description is for descriptive purposes only and should not be understood as expressing or implying relative importance or the number of the indicated technical features. Therefore, a feature qualified as "first" or "second" may explicitly or implicitly include at least one of the features. Furthermore, when the word "and / or" appears in the full text, its meaning includes three parallel schemes. For example, "A and / or B" includes scheme A, scheme B, or a scheme that simultaneously satisfies both A and B. Furthermore, technical solutions in each embodiment may be combined with each other, provided that such combination is feasible by a person skilled in the art. If a combination of technical solutions is mutually inconsistent or impractical, such combination of technical solutions should be considered as non-existent and does not fall within the scope of protection claimed by the present application.

[0021] This application proposes an electromagnetic structure for an angle sensor.

[0022] 1 to 7 , in one embodiment of the present application, an electromagnetic structure for an angle sensor includes a stator assembly 1 and a rotor assembly 2. The stator assembly 1 includes a stator magnetic core 11 and a stator winding 12. The stator winding 12 is provided on one side of the stator magnetic core 11. The stator winding 12 includes a stator excitation winding 121 and a stator angle winding 122 that are provided in layers. The stator excitation winding 121 is used to connect an external power supply. The rotor assembly 2 includes a rotor magnetic core 21 and a rotor winding 22. The rotor winding 22 is provided on one side of the rotor magnetic core 21. The rotor winding 22 is located on the side of the stator winding 12 that is away from the stator magnetic core 11. An air gap 3 is formed between the stator winding 12 and the rotor winding 22. The rotor winding 22 includes a rotor excitation winding 221 and a rotor angle winding 222 that are provided in layers and are electrically connected to each other.

[0023] The stator magnetic core 11, the stator excitation winding 121, the stator angle winding 122, the rotor excitation winding 221 and the rotor angle winding 222 are laminated, an air gap 3 is formed between the stator winding 12 and the rotor winding 22, and an excitation current is supplied to the stator excitation winding 121 from an external power supply, whereby the stator excitation winding 121 generates an alternating excitation magnetic field in the air gap 3, and the alternating excitation magnetic field is connected to the rotor excitation winding 221 via the stator magnetic core 11 and the rotor magnetic core 21, generating an induced electromotive force in the rotor excitation winding 221. In addition, since the rotor excitation winding 221 is connected to the rotor angle winding 222, an alternating current is generated in the rotor angle winding 222, generating an alternating magnetic field in the air gap 3, and the alternating magnetic field generates an induced electromotive force in the stator angle winding 122. The excitation winding consisting of the stator excitation winding 121 and the rotor excitation winding 221 and the angle winding consisting of the stator angle winding 122 and the rotor angle winding 222 share the air gap 3 in one area, which makes the structure of the electromagnetic structure for the angle sensor more compact and achieves the purpose of reducing the volume of the entire electromagnetic structure for the angle sensor.

[0024] In one embodiment, referring to FIGS. 3 to 6, the stator excitation winding 121 and the stator angle winding 122, and the rotor excitation winding 221 and the rotor angle winding 222 are provided on different layers of the circuit board.

[0025] In the above structure, the stator magnetic core 11, the stator excitation winding 121, the stator angle winding 122, the rotor excitation winding 221, and the rotor angle winding 222 are all stacked to generate an excitation magnetic field and an alternating magnetic field in the axial direction. The stator excitation winding 121, the stator angle winding 122, the rotor excitation winding 221, and the rotor angle winding 222 are all mounted on different layers of the circuit board, which allows the stator excitation winding 121, the stator angle winding 122, the rotor excitation winding 221, and the rotor angle winding 222 to be fabricated precisely, thereby improving the structural precision of the electromagnetic structure. When this electromagnetic structure is applied to a sensor, the measurement precision of the sensor can also be improved.

[0026] Due to the orthogonal characteristics of the excitation magnetic field, the excitation magnetic field cannot induce back electromotive force in the stator angle winding 122 and the rotor angle winding 222, so the excitation winding consisting of the stator excitation winding 121 and the rotor excitation winding 221 and the angle winding consisting of the stator angle winding 122 and the rotor angle winding 222 do not interfere with each other. In other words, the stator excitation winding 121 and the rotor excitation winding 221 have 0 equivalent magnetic pole pairs in the tangential direction, but 1 equivalent magnetic pole pair in the radial direction, so the excitation magnetic field does not induce back electromotive force in the angle windings of the stator angle winding 122 and the rotor angle winding 222. The axial direction is a direction perpendicular to the stator magnetic core 11, the stator excitation winding 121, the stator angle winding 122, the rotor excitation winding 221, and the rotor angle winding 222; the radial direction is a direction that coincides with or is opposite to the radial direction of the circulating locus of the stator magnetic core 11, the stator excitation winding 121, the stator angle winding 122, the rotor excitation winding 221, and the rotor angle winding 222; and the tangential direction is a direction that coincides with the tangential direction of the circulating curved locus of the stator magnetic core 11, the stator excitation winding 121, the stator angle winding 122, the rotor excitation winding 221, and the rotor angle winding 222.

[0027] In one embodiment, the rotor excitation winding 221 is electrically connected to the rotor angle winding 222. The rotor angle winding 222 receives an excitation current supplied from the rotor excitation winding 221, and generates an axial alternating magnetic field related to rotor angle information in the air gap 3, i.e., the above-mentioned axial alternating magnetic field, which is connected to the stator angle sine winding 1221 and the stator angle cosine winding 1222. Therefore, the back electromotive force in the rotor excitation winding 221 generates an AC current in the rotor angle winding 222, and when the electromagnetic structure for the angle sensor is applied to the sensor, the rotor angle winding 222 generates an alternating magnetic field with one magnetic pole pair in the tangential direction. Since the number of magnetic pole pairs of the alternating magnetic field generated in the tangential direction by the rotor angle winding 222 is one, the alternating magnetic field and the excitation magnetic field are perpendicular to each other and do not interfere with each other. However, the alternating magnetic field of the pair of magnetic poles generated by the rotor angle winding 222 can be effectively connected to the stator angle sine winding 1221 and the stator angle cosine winding 1222, which also have one magnetic pole pair, and causes the stator angle sine winding 1221 and the stator angle cosine winding 1222 to generate an induced electromotive force related to the rotor angle position.

[0028] In one embodiment, referring to FIG. 4 , the stator angle winding 122 includes a stator angle sine winding 1221 and a stator angle cosine winding 1222, and a phase difference in electrical angle is provided between the stator angle sine winding 1221 and the stator angle cosine winding 1222.

[0029] In the above structure, there is a sine relationship between the amplitude of the back electromotive force generated by the stator angle sine winding 1221 and the amplitude of the back electromotive force generated between the rotor angle windings 222, and there is a sine relationship between the amplitude of the back electromotive force generated by the stator angle cosine winding 1222 and the amplitude of the back electromotive force generated between the rotor angle windings 222. These relationships enable accurate detection of the angle of the rotor assembly 2. By connecting the ends of the stator angle sine winding 1221 and the stator angle cosine winding 1222 to an external circuit, the signals of the back electromotive forces generated by these two windings can be analyzed, and the rotation angle of the rotor assembly 2 can be calculated.

[0030] Referring to FIG. 3, the stator excitation winding 121 includes a first excitation winding 1211 (FIG. 3A), a second excitation winding 1212 (FIG. 3B), and a first circuit board 1213. The first excitation winding 1211 and the second excitation winding 1212 are both provided on the first circuit board 1213, and the first circuit board 1213 has a first connection hole 12131 and a first electrical connection portion 12132. One end of the first excitation winding 1211 is connected to a first electrical connection portion 12132, the other end of the first excitation winding 1211 is electrically connected to one end of the second excitation winding 1212 via a first connection hole 12131, and the other end of the second excitation winding 1212 is electrically connected to the first electrical connection portion 12132, which is used to connect an external power supply. The first excitation winding 1211 and the second excitation winding 1212 are provided on a first circuit board 1213 by printing.

[0031] In one embodiment, referring to FIG. 3, the stator excitation winding 121 includes a first excitation winding 1211 (FIG. 3a), a second excitation winding 1212 (FIG. 3b), a first circuit board 1213, and a second circuit board 1214, the first excitation winding 1211 is provided on one surface of the first circuit board 1213, the first circuit board 1213 is provided with a first connection hole 12131 and a first electrical connection portion 12132, one end of the first excitation winding 1211 is connected to the first electrical connection portion 12132, and the second circuit board 1214 is provided with a first connection hole 12131 and a first electrical connection portion 12132. 3, and the second excitation winding 1212 is provided on the surface of one side of the second circuit board 1214, and the second circuit board 1214 is provided with a second connection hole 12141 and a second electrical connection portion 12142, and the other end of the first excitation winding 1211 is electrically connected to one end of the second excitation winding 1212 via the first connection hole 12131 and the second connection hole 12141, and the other end of the second excitation winding 1212 is connected to the second electrical connection portion 12142, and the first electrical connection portion 12132 and the second electrical connection portion 12142 are used to connect an external power supply.

[0032] The first excitation winding 1211 is provided on the first circuit board 1213 by printing, and the second excitation winding 1212 is provided on the second circuit board 1214 by printing. One end of the first excitation winding 1211 passes through a first connection hole 12131 and is connected to the second excitation winding 1212. The arc-shaped conductors are concentrated in the region between the inner hole and the outer periphery of the first circuit board 1213, gradually transitioning from the arc-shaped conductor with the largest radius to the arc-shaped conductor with the smallest radius, thereby maximizing the generation of an effective excitation magnetic field in this region. The second circuit board 1214 is provided with a second connection hole 12141 located on the path of the arc-shaped conductor with the smallest radius, which makes it easy for one end of the first excitation winding 1211 to pass through the first connection hole 12131 and then through the second connection hole 12141 to be connected to the second excitation winding 1212. One end of the first excitation winding 1211 is connected to one end of the second excitation winding 1212, the other end of the first excitation winding 1211 is connected to the first electrical connection 12132, and the other end of the second excitation winding 1212 is connected to the second electrical connection 12142, with the first electrical connection 12132 and the second electrical connection 12142 being connected to an external power supply. The first excitation winding 1211 and the second excitation winding 1212 are connected in series or parallel, and the magnetic fields generated by the first excitation winding 1211 and the second excitation winding 1212 are both axial magnetic fields, with the two excitation magnetic fields reinforcing each other.

[0033] In one embodiment, referring to FIGS. 3 to 6, the stator excitation winding 121 includes an annular winding that goes around from the center to the edge, and the stator angle winding 122 and the rotor angle winding 222 each include two semi-annular windings arranged symmetrically around the center.

[0034] Among them, the first excitation winding 1211 and the second excitation winding 1212 are both composed of multiple arc-shaped conductors, with a gradual change from the arc-shaped conductor with the largest radius to the arc-shaped conductor with the smallest radius, and among them, the first circuit board 1213 is provided with a first connection hole 12131, and the second circuit board 1214 is provided with a second connection hole 12141, and the first connection hole 12131 is located on the path of the arc-shaped conductor with the smallest radius in the first excitation winding 1211, and the second connection hole 12141 is located on the path of the arc-shaped conductor with the smallest radius in the second excitation winding 1212, and one end of the first excitation winding 1211 is electrically connected to the second excitation winding 1212 through the first connection hole 12131 and the second connection hole 12141.

[0035] In one embodiment, the stator angle sine winding 1221 includes a first angle winding 12211 (a in FIG. 4), a second angle winding 12212 (b in FIG. 4), and a third circuit board 12213, where the first angle winding 12211 is provided on the third circuit board 12213, and the third circuit board 12213 has a third connection hole 122131 and a third electrical connection portion 122132, where the first angle winding 12211 is connected to the third electrical connection portion 122132, and the first angle winding 12211 is electrically connected to the second angle winding 12212 via the third connection hole 122131. The first angle winding 12211 and the second angle winding 12212 are both laminated on one side of the third circuit board 12213 by printing, or are printed on both sides of the third circuit board 12213, respectively.

[0036] In one embodiment, referring to FIG. 4 , the stator angle sine winding 1221 includes a first angle winding 12211 (a in FIG. 4 ), a second angle winding 12212 (b in FIG. 4 ), a third circuit board 12213, and a fourth circuit board 12214, where the first angle winding 12211 is provided on one side of the third circuit board 12213, and the third circuit board 12213 is provided with a third connection hole 122131 and a third electrical connection portion 122132, and the first angle winding 12211 is connected to the third electrical connection portion 12213. 2, a fourth circuit board 12214 is located on one side of the third circuit board 12213, a second angle winding 12212 is provided on one side of the fourth circuit board 12214, an eighth connection hole 122141 is provided on the fourth circuit board 12214, the first angle winding 12211 is electrically connected to the second angle winding 12212 through the third connection hole 122131 and the eighth connection hole 122141, and the second angle winding 12212 is electrically connected to the third electrical connection portion 122132.

[0037] The electromagnetic structure for the angle sensor may include multiple sets of stator excitation windings 121, multiple sets of stator angle windings 122, multiple sets of rotor excitation windings 221, and multiple sets of rotor angle windings 222. The stator angle sine winding 1221 is a concentrated winding or traveling wave winding with one magnetic pole pair, and the first angle winding 12211 and the second angle winding 12212 are connected through a third connection hole 122131. The third electrical connection portion 122132 includes a first input end electrically connected to the first angle winding 12211 and a first output end electrically connected to the second angle winding 12212.

[0038] The first angular winding 12211 is provided on the third circuit board 12213 by printing, and the second angular winding 12212 is provided on the second circuit board 1214 by printing, wherein the first excitation winding 1211 is composed of multiple semicircular arc-shaped conductors, gradually transitioning from the arc-shaped conductor with the largest radius to the arc-shaped conductor with the smallest radius, and the first circuit board 1213 is provided with a first connection hole 12131 located on the path of the arc-shaped conductor with the smallest radius, and one end of the first excitation winding 1211 passes through the first connection hole 12131 and is electrically connected to the second excitation winding 1212. When the number of magnetic pole pairs in the tangential direction of the stator angular sine winding 1221 is 1, the electromagnetic structure for the angle sensor can be used in the sensor to detect the angle. If the number of pole pairs in the stator angle sine winding 1221 is a positive integer greater than 1, the electromagnetic structure for the angle sensor can be used in the sensor to detect incremental angles.

[0039] The stator angle cosine winding 1222 includes a third angle winding 12221 (c in FIG. 4), a fourth angle winding 12222 (d in FIG. 4), and a fifth circuit board 12223, wherein the third angle winding 12221 is provided on one side surface of the fifth circuit board 12223, and the fifth circuit board 12223 has a fourth connection hole 122231 and a fourth electrical connection portion 122232, wherein the third angle winding 12221 is connected to the fourth electrical connection portion 122232, and the third angle winding 12221 is electrically connected to the fourth angle winding 12222 via the fourth connection hole 122231. The third angle winding 12221 (c in Figure 4) and the fourth angle winding 12222 (d in Figure 4) are provided on one side of the fifth circuit board 12223, or are printed on both sides of the fifth circuit board 12223, respectively.

[0040] In one embodiment, referring to FIG. 4, the stator angle cosine winding 1222 includes a third angle winding 12221 (c in FIG. 4), a fourth angle winding 12222 (d in FIG. 4), a fifth circuit board 12223, and a sixth circuit board 21124, where the third angle winding 12221 is provided on one side of the fifth circuit board 12223, and the fifth circuit board 12223 is provided with a fourth connection hole 122231 and a fourth electrical connection portion 122232, and the third angle winding The wire 12221 is connected to the fourth electrical connection portion 122232, the sixth circuit board 21124 is located on one side of the fifth circuit board 12223, the fourth angle winding 12222 is provided on one side surface of the fifth circuit board 12223, the sixth circuit board 21124 has a ninth connection hole 211241, and the third angle winding 12221 is electrically connected to the fourth angle winding 12222 via the fourth connection hole 122231 and the ninth connection hole 211241.

[0041] The third excitation winding 2211 is formed on the fifth circuit board 12223 by printing, and the fourth excitation winding 12222 is formed on the sixth circuit board 21124 by printing. The third excitation winding 2211 is composed of a plurality of semicircular arc-shaped conductors, gradually transitioning from the semicircular arc-shaped conductor with the largest radius to the semicircular arc-shaped conductor with the smallest radius. The fifth circuit board 12223 has a fourth connection hole 122231 located on the path of the semicircular arc-shaped conductor with the smallest radius. One end of the third excitation winding 2211 passes through the fourth connection hole 122231 and is electrically connected to the fourth excitation winding 2212. When the number of magnetic pole pairs in the tangential direction of the stator cosine winding 1222 is equal to the number of magnetic pole pairs of the stator cosine winding 1221, there is a phase difference of 90 electrical degrees between the stator cosine winding 1221 and the stator cosine winding 1222. A fourth angle difference is provided between the third angle winding 12221 and the fourth angle winding 12222, and the magnitude of the fourth angle difference is determined by the number of harmonics to be removed in the total back electromotive force.

[0042] The stator angular winding 122 adopts a 180° full-pitch winding installation form, but may also adopt a wave winding or fractional slot concentrated winding installation form to form a winding structure with one magnetic pole pair in the tangential direction, and the stator angular winding 122 is mounted on a circuit board.

[0043] In one embodiment, the rotor excitation winding 221 includes a third excitation winding 2211 (a in FIG. 5), a fourth excitation winding 2212 (b in FIG. 5), and a seventh circuit board 2213, and the third excitation winding 2211 and the fourth excitation winding 2212 are both provided on the seventh circuit board 2213, and the seventh circuit board 2213 is provided with a fifth connection hole 22131 and a fifth electrical connection portion 22132. One end of the third excitation winding 2211 is connected to a fifth electrical connection portion 22132, the other end of the third excitation winding 2211 is electrically connected to one end of the fourth excitation winding 2212 via a fifth connection hole 22131, and the other end of the fourth excitation winding 2212 is connected to the fifth electrical connection portion 22132, which is electrically connected to the rotor angular winding 222. The third excitation winding 2211 (a in FIG. 5) and the fourth excitation winding 2212 (b in FIG. 5) are provided on one side of the seventh circuit board 2213, or are printed on both sides of the seventh circuit board 2213, respectively.

[0044] In one embodiment, referring to FIG. 5, the rotor excitation winding 221 includes a third excitation winding 2211 (a in FIG. 5), a fourth excitation winding 2212 (b in FIG. 5), a seventh circuit board 2213, and an eighth circuit board 2214, the third excitation winding 2211 is provided on one side of the seventh circuit board 2213, the seventh circuit board 2213 is provided with a fifth connection hole 22131 and a fifth electrical connection portion 22132, one end of the third excitation winding 2211 is connected to the fifth electrical connection portion 22132, and the eighth circuit board 2214 is provided with a fifth connection hole 22131 and a fifth electrical connection portion 22132. The third excitation winding 2211 is located on one side of the plate 2213, and the fourth excitation winding 2212 is provided on one side of the eighth circuit board 2214, and the eighth circuit board 2214 is provided with a sixth connection hole 22141 and a sixth electrical connection portion 22142, and the other end of the third excitation winding 2211 is electrically connected to one end of the fourth excitation winding 2212 via the fifth connection hole 22131 and the sixth connection hole 22141, and the other end of the fourth excitation winding 2212 is connected to the sixth electrical connection portion 22142, and the sixth electrical connection portion 22142 is electrically connected to the rotor angle winding 222.

[0045] The third excitation winding 2211 is provided on the seventh circuit board 2213 by printing, and the fourth excitation winding 2212 is provided on the eighth circuit board 2214 by printing, with one end of the third excitation winding 2211 passing through a fifth connection hole 22131 and connected to the fourth excitation winding 2212. The third excitation winding 2211 and the fourth excitation winding 2212 both have arc-shaped conductors that gradually transition from the largest radius to the smallest radius, and the arc-shaped conductors are concentrated in the region between the inner hole and the outer periphery of the seventh circuit board 2213 or the eighth circuit board 2214, thereby generating the maximum effective excitation magnetic field in this region. Among them, the seventh circuit board 2213 is provided with a sixth connection hole 22141 located on the path of the arc-shaped conductor with the smallest radius, which makes it easy for one end of the third excitation winding 2211 to pass through the fifth connection hole 22131, and then pass through the sixth connection hole 22141 to be connected to the fourth excitation winding 2212. In addition, one end of the third excitation winding 2211 is connected to one end of the fourth excitation winding 2212, the other end of the third excitation winding 2211 is connected to the fifth electrical connection part 22132, and the other end of the second excitation winding 2212 is connected to the sixth electrical connection part 22142. The first excitation winding 1211 and the second excitation winding 1212 are connected in series or in parallel, and the magnetic fields generated by the first excitation winding 1211 and the second excitation winding 1212 are both axial magnetic fields, with the two excitation magnetic fields reinforcing each other. The centers of the stator excitation winding 121 and the rotor excitation winding 221 are coaxial.

[0046] In one embodiment, the rotor angle winding 222 includes a fifth angle winding 2221 (a in FIG. 6), a sixth angle winding 2222 (b in FIG. 6), and a ninth circuit board 2223, wherein the fifth angle winding 2221 is provided on the ninth circuit board 2223, and the ninth circuit board 2223 is provided with a seventh connection hole 22231 and a seventh electrical connection portion 22232, wherein the fifth angle winding 2221 is connected to the seventh electrical connection portion 22232, and the fifth angle winding 2221 is electrically connected to the sixth angle winding 2222 through the seventh connection hole 22231, and the seventh electrical connection portion 22232 is electrically connected to the sixth electrical connection portion 22142. The fifth angle winding 2221 (a in FIG. 6) and the sixth angle winding 2222 (b in FIG. 6) are provided on one side of the ninth circuit board 2223, or are printed on both sides of the ninth circuit board 2223, respectively.

[0047] In one embodiment, referring to FIG. 6 , the rotor angle winding 222 includes a fifth angle winding 2221 (a in FIG. 6 ), a sixth angle winding 2222 (b in FIG. 6 ), a ninth circuit board 2223, and a tenth circuit board 2224, and the fifth angle winding 2221 is provided on one side of the ninth circuit board 2223, and the ninth circuit board 2223 is provided with a seventh connection hole 22231 and a seventh electrical connection portion 22232, and the fifth angle winding 2221 is connected to the seventh electrical connection portion 22232. The ninth circuit board 2223 is connected to the sixth angle winding 2222, the tenth circuit board 2224 is located on one side of the ninth circuit board 2223, the sixth angle winding 2222 is provided on one side of the tenth circuit board 2224, the tenth circuit board 2224 has an eleventh connection hole 22241, the fifth angle winding 2221 is electrically connected to the sixth angle winding 2222 through the seventh connection hole 22231 and the eleventh connection hole 22241, and the seventh electrical connection portion 22232 is electrically connected to the sixth electrical connection portion 22142.

[0048] The fifth angular winding 2221 is provided on the ninth circuit board 2223 by printing, and the sixth angular winding 2222 is provided on the tenth circuit board 2224 by printing, wherein the fifth angular winding 2221 and the sixth angular winding 2222 are each composed of a plurality of semicircular arc-shaped conductors, gradually transitioning from the largest radius arc-shaped conductor to the smallest radius arc-shaped conductor, wherein the ninth circuit board 2223 has a seventh connecting hole 22231 located on the path of the smallest radius arc-shaped conductor, and one end of the fifth excitation winding passes through the seventh connecting hole 22231 and is electrically connected to the sixth excitation winding. The seventh electrical connection 22232 is electrically connected to the rotor excitation winding 221, allowing the stator angular winding 122 to receive the excitation current supplied from the rotor excitation winding 221 and generate an axial alternating magnetic field related to rotor angle information in the air gap 3.

[0049] In one embodiment, the electromagnetic structure for the angle sensor includes M sets of stator excitation windings 121 and N sets of stator angle windings 122, where M and N are both positive integers, a second angle difference is provided between different stator angle windings 122, a third angle difference is provided between the first angle winding 12211 and the second angle winding 12212, and a fourth angle difference is provided between the third angle winding 12221 and the fourth angle winding 12222; the electromagnetic structure for the angle sensor includes P sets of rotor excitation windings 221 and Q sets of rotor angle windings 222, where P and Q are both positive integers, a fifth angle difference is provided between different rotor angle windings, and a sixth angle difference is provided between the fifth angle winding and the sixth angle winding.

[0050] In order to ensure that the back electromotive force induced by the stator angle winding 122 has relatively small harmonics, the fifth angle winding and the sixth angle winding may be offset to form a sixth angle difference according to the harmonics that need to be cancelled, for example, to cancel the third harmonic, the fifth angle winding and the sixth angle winding are offset by a rotation angle of 60°.

[0051] In order to ensure that the back electromotive force induced by the stator angle winding 122 has relatively small harmonics, the first angle winding 12211 and the second angle winding 12212 may be shifted to form a third angle difference according to the harmonics that need to be canceled, and at the same time, the third angle winding 12221 and the fourth angle winding 12222 may be shifted to form a fourth angle difference according to the harmonics that need to be canceled, for example, to cancel the fifth harmonic, the first angle winding 12211 and the second angle winding 12212 are shifted by a rotation angle of 36°, and the third angle winding 12221 and the fourth angle winding 12222 are shifted by a rotation angle of 36°.

[0052] Many applications are sensitive to certain harmonics of the back-EMF of the stator signal windings. These harmonics can be eliminated by adding a new set of stator angle windings 122 or rotor angle windings 222. The added angle windings are spatially separated by a certain angle from the existing stator angle windings 122 or rotor angle windings 222. When the new and old sets of angle windings are connected in series, the fundamental components of the back-EMF of the two sets of windings become larger due to overlap, but the corresponding harmonics are canceled out because they are in opposite phase.

[0053] By providing multiple sets of stator angle windings or multiple sets of rotor angle windings, seventh and higher harmonics can be eliminated, in which a second angle difference is provided between different stator angle windings 122 and a fifth angle difference is provided between different rotor angle windings. Here, referring to FIG. 7 , the rotor angle winding 222 will be taken as an example. For example, an electromagnetic structure for an angle sensor includes two sets of rotor angle windings 222, in which the fifth angle winding 2221 and the sixth angle winding 2222 of one set are existing rotor angle windings 222, while the seventh angle winding 2225 and the eighth angle winding 2226 of the other set are new rotor angle windings 222, and the topology structure of the new rotor angle windings 222 is the same as that of the existing rotor angle windings 222. To eliminate the seventh harmonic of the back EMF of the stator angle winding 122, the existing rotor angle winding 222, which is composed of the fifth angle winding 2221 and the sixth angle winding 2222, and the new rotor angle winding 222, which is composed of the seventh angle winding 2225 and the eighth angle winding 2226, are spatially separated by 25.71429° (180° / 7). This eliminates the seventh harmonic magnetic field in the air gap 3, and accordingly, the seventh harmonic magnetic field in the stator angle winding 122 is also eliminated; that is, the second angle difference can be 25.71429°. However, the sixth angle difference between the seventh angle winding 2225 and the eighth angle winding 2226 is equal to the second angle difference between the fifth angle winding 2221 and the sixth angle winding 2222.

[0054] If it is necessary to further eliminate the 11th harmonic, another set of 9th and 10th angle windings is added as the new rotor angle winding 222. The existing rotor angle winding 222 consisting of the fifth angle winding 2221 and the sixth angle winding 2222 is spatially separated by 16.36364° (180° / 11) from the new rotor angle winding 222 consisting of the seventh angle winding 2225 and the eighth angle winding 2226, and the new rotor angle winding 222 consisting of the seventh angle winding 2225 and the eighth angle winding 2226 is spatially separated by 16.36364° from the newer rotor angle winding 222 consisting of the 9th and 10th angle windings.

[0055] Similarly, by adding multiple sets of stator angle windings 122, certain harmonics of the back electromotive force may be eliminated, i.e., when the fifth angle difference is 25.71429°, the seventh harmonic magnetic field in the stator angle windings 122 can be eliminated.

[0056] To allow for incremental angle measurement, the number of pole pairs in the stator angle winding 122 and the rotor angle winding 222 may be a positive integer greater than one, but the number of fundamental pole pairs in the stator angle winding 122 and the rotor angle winding 222 must be the same. Also, to eliminate back EMF harmonics in more angle windings, the number of sets of the stator angle winding 122 or rotor angle winding 222 may be increased to provide a corresponding angular difference between the windings in each layer in terms of the spatial harmonic to be eliminated.

[0057] In one embodiment, the rotor magnetic core 21 and the stator magnetic core 11 are both made of a ferromagnetic material with a magnetic permeability greater than 100. A ferromagnetic material with a magnetic permeability greater than 100 is also called a soft magnetic material with high magnetic permeability, and examples of such materials include silicon steel and ferrite soft magnetic materials. The magnetic permeability reflects the responsiveness of a material to a magnetic field; the higher the magnetic permeability, the stronger the magnetic ability of the magnetic material, which in turn increases the energy conversion rate of the electromagnetic structure for the angle sensor.

[0058] The number of tangential pole pairs of the rotor angle winding 222, the stator angle sine winding 1221, and the stator angle cosine winding 1222 are all one, so that the magnetic field of the rotor angle winding 222 can be effectively connected with the stator angle winding 122. To improve the accuracy of the sensor, the number of pole pairs of the rotor angle winding 222 and the stator angle winding 122 can be more than one, thereby enabling incremental angle measurement.

[0059] In order to fully utilize the space of the electromagnetic structure for the angle sensor and the magnetic field generated by the windings, the stator magnetic core 11 and the rotor magnetic core 21 may be changed to other shapes, for example, the stator magnetic core 11 may be provided with a first groove for accommodating the stator excitation winding 121 and the stator angle winding 122, and the rotor magnetic core 21 may be provided with a second groove for the rotor excitation winding 221 and the rotor angle winding 222, thereby making the structure of the electromagnetic structure for the angle sensor more compact. The stator angle winding 122 and the rotor angle winding 222 may be realized in the form of a distributed winding, a centralized winding, or a wave winding.

[0060] The technical solution of the present application is to laminate a stator magnetic core 11, a stator excitation winding 121, a stator angle winding 122, a rotor excitation winding 221, and a rotor angle winding 222, and form an air gap 3 between the stator winding 12 and the rotor winding 22. An excitation current is supplied to the stator excitation winding 121 by an external power supply, and the stator excitation winding 121 generates an alternating excitation magnetic field in the air gap 3. The alternating excitation magnetic field is connected to the rotor excitation winding 221 via the stator magnetic core 11 and the rotor magnetic core 21, and generates an induced electromotive force in the rotor excitation winding 221. In addition, since the rotor excitation winding 221 is connected to the rotor angle winding 222, an alternating current is generated in the rotor angle winding 222, and an alternating magnetic field is generated in the air gap 3, and the alternating magnetic field generates an induced electromotive force in the stator angle winding 122. The excitation winding consisting of the stator excitation winding 121 and the rotor excitation winding 221 and the angle winding consisting of the stator angle winding 122 and the rotor angle winding 222 share the air gap 3 in one area, which makes the structure of the electromagnetic structure more compact and achieves the purpose of reducing the volume of the entire electromagnetic structure.

[0061] Furthermore, the present application proposes an angle sensor including an electromagnetic structure for the angle sensor, and the specific structure of the electromagnetic structure for the angle sensor is as described in the above embodiments. Since the present sensor adopts the entire technical solutions of all the above embodiments, it at least has the entire beneficial effects brought about by the technical solutions of the above embodiments, and therefore, they will not be described one by one here.

[0062] In the installed angle sensor, the stator excitation winding 121, the stator angle winding 122, the rotor excitation winding 221, and the rotor angle winding 222 all have the same central axis direction.

[0063] An axial hole is provided in the center of the electromagnetic structure for the angle sensor to connect with the connecting shaft of the sensor. The additional axial hole has the advantage of facilitating installation, and also allows the stator excitation winding 121, the stator angle winding 122, the rotor excitation winding 221 and the rotor angle winding 222 to be installed coaxially.

[0064] The above are merely some examples of the present application, and do not limit the scope of the patent of the present application. Equivalent structural transformations made using the contents of the specification and drawings of the present application under the technical concept of the present application, or direct / indirect application to other related technical fields, are all included in the scope of protection of the patent of the present application. [Explanation of symbols]

[0065] 1 Stator Assembly 11 Stator magnetic core 12 stator winding 121 Stator excitation winding 1211 First excitation winding 1212 Second excitation winding 1213 First Circuit Board 12131 First connection hole 12132 First Electrical Connection 1214 Second Circuit Board 12141 Second connection hole 12142 Second Electrical Connection 122 Stator angle winding 1221 Stator angle sine winding 12211 First angle winding 12212 Second Angle Winding 12213 Third Circuit Board 122131 Third connection hole 122132 Third Electrical Connection 12214 Fourth Circuit Board 122141 8th connection hole 1222 Stator angle cosine winding 12221 Third Angle Winding 12222 4th angle winding 12223 Fifth Circuit Board 122231 4th connection hole 122232 Fourth Electrical Connection 21124 6th Circuit Board 211241 9th connection hole 2 Rotor Assembly 21 Rotor magnetic core 22 rotor winding 221 Rotor excitation winding 2211 Third excitation winding 2212 Fourth excitation winding 2213 Seventh Circuit Board 22131 5th connection hole 22132 Fifth Electrical Connection 2214 8th Circuit Board 22141 6th connection hole 22142 Sixth Electrical Connection 222 rotor angle winding 2221 5th angle winding 2222 6th angle winding 2223 9th Circuit Board 22231 7th connection hole 22232 Seventh Electrical Connection 2224 10th Circuit Board 22241 11th connection hole 2225 7th angle winding 2226 8th angle winding 3. Air gap 4 Magnetic field lines of the excitation magnetic field

Claims

1. a stator assembly including a stator magnetic core and a stator winding, the stator winding being provided on one side of the stator magnetic core, the stator winding including a stator excitation winding and a stator angle winding provided in a stacked manner, the stator excitation winding being used to connect an external power source; a rotor assembly including a rotor magnetic core and a rotor winding, the rotor winding being provided on one side of the rotor magnetic core, the rotor winding being located on a side of the stator winding remote from the stator magnetic core, an air gap being formed between the stator winding and the rotor winding, the rotor winding including a rotor excitation winding and a rotor angle winding that are provided in layers and electrically connected to each other; Electromagnetic structure for angle sensors.

2. The stator excitation winding and the stator angle winding, and the rotor excitation winding and the rotor angle winding are located in the same axial electromagnetic region but are provided on different layers of a circuit board; and / or the stator angle windings include a stator angle sine winding and a stator angle cosine winding, and a phase difference of a first angle is provided between the stator angle sine winding and the stator angle cosine winding; Electromagnetic structure for an angle sensor according to claim 1 .

3. the stator excitation winding includes a first excitation winding, a second excitation winding, and a first circuit board, the first excitation winding and the second excitation winding are both provided on the first circuit board, the first circuit board is provided with a first connection hole and a first electrical connection portion, one end of the first excitation winding is connected to the first electrical connection portion, the other end of the first excitation winding is electrically connected to one end of the second excitation winding via the first connection hole, the other end of the second excitation winding is connected to the first electrical connection portion, and the first electrical connection portion is used to connect an external power supply; Electromagnetic structure for an angle sensor according to claim 2.

4. the stator angle sine winding includes a first angle winding, a second angle winding, and a third circuit board, the first angle winding and the second angle winding are both provided on the third circuit board, the third circuit board is provided with a third connection hole and a third electrical connection portion, the first angle winding is connected to the third electrical connection portion, the first angle winding is electrically connected to the second angle winding through the third connection hole, and the second angle winding is electrically connected to the third electrical connection portion; The stator angle cosine winding includes a third angle winding, a fourth angle winding, and a fifth circuit board, the third angle winding and the fourth angle winding are both provided on one side surface of the fifth circuit board, the fifth circuit board is provided with a fourth connection hole and a fourth electrical connection part, the third angle winding is connected to the fourth electrical connection part, and the third angle winding is electrically connected to the fourth angle winding via the fourth connection hole. Electromagnetic structure for an angle sensor according to claim 2.

5. the rotor excitation winding includes a third excitation winding, a fourth excitation winding, and a seventh circuit board, the third excitation winding and the fourth excitation winding are both provided on the seventh circuit board, the seventh circuit board is provided with a fifth connection hole and a fifth electrical connection portion, one end of the third excitation winding is connected to the fifth electrical connection portion, the other end of the third excitation winding is electrically connected to one end of the fourth excitation winding via the fifth connection hole, the other end of the fourth excitation winding is electrically connected to the fifth electrical connection portion, and the fifth electrical connection portion is electrically connected to the rotor angular winding. Electromagnetic structure for an angle sensor according to claim 4.

6. the rotor angle winding includes a fifth angle winding, a sixth angle winding, and a ninth circuit board, the fifth angle winding and the sixth angle winding are both provided on the ninth circuit board, the ninth circuit board is provided with a seventh connection hole and a seventh electrical connection part, the fifth angle winding is connected to the seventh electrical connection part, and the fifth angle winding and the sixth angle winding are electrically connected to the sixth angle winding through the seventh connection hole; Electromagnetic structure for an angle sensor according to claim 5.

7. the electromagnetic structure for the angle sensor includes M sets of stator excitation windings and N sets of stator angle windings, where M and N are both positive integers, a second angle difference is provided between different stator angle windings, a third angle difference is provided between the first angle winding and the second angle winding, and a fourth angle difference is provided between the third angle winding and the fourth angle winding; the electromagnetic structure for the angle sensor includes P sets of rotor excitation windings and Q sets of rotor angle windings, where P and Q are both positive integers, a fifth angle difference is provided between different rotor angle windings, and a sixth angle difference is provided between the fifth angle winding and the sixth angle winding; 7. An electromagnetic structure for an angle sensor according to claim 6.

8. The rotor magnetic core and the stator magnetic core are both made of a ferromagnetic material having a magnetic permeability of greater than 100. Electromagnetic structure for an angle sensor according to any one of claims 1 to 7.

9. the stator excitation winding includes an annular winding that goes around from the center toward the edge, and the stator angular winding and the rotor angular winding each include two semi-annular windings that are arranged symmetrically about the center; An electromagnetic structure for an angle sensor according to any one of claims 2 to 7.

10. An electromagnetic structure for an angle sensor according to any one of claims 1 to 9, Angle sensor.

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